use std::future::Future;
use std::pin::Pin;
use std::time::{SystemTime, UNIX_EPOCH};

use async_trait::async_trait;
use sha2::{Digest, Sha256};
use sqlx::{Connection, Row, SqliteConnection, SqlitePool, sqlite::SqliteConnectOptions};

use crate::domain::{
    Category, DomainError, DomainResult, GroceryList, Item, ListMeal, Meal, MealCategory,
    MealIngredient, Passkey, SessionUser, User,
};
use crate::ports::{
    CategoryRepository, InvitationRepository, ItemRepository, ListMealRepository, ListRepository,
    MealCategoryRepository, MealIngredientRepository, MealRepository, NewItem, PasskeyRepository,
    SessionRepository, UserRepository,
};

/// The embedded SQL migrations, applied automatically on startup.
static MIGRATOR: sqlx::migrate::Migrator = sqlx::migrate!();

#[derive(Clone)]
pub struct SqliteDatabase {
    pool: SqlitePool,
}

impl SqliteDatabase {
    pub async fn open(path: &str) -> DomainResult<Self> {
        let options = SqliteConnectOptions::new()
            .filename(path)
            .journal_mode(sqlx::sqlite::SqliteJournalMode::Wal)
            .foreign_keys(true)
            .busy_timeout(std::time::Duration::from_secs(5))
            .create_if_missing(true);
        let pool = SqlitePool::connect_with(options).await.map_err(db_error)?;
        MIGRATOR.run(&pool).await.map_err(migrate_error)?;
        seed_default_categories(&pool).await?;
        seed_default_meal_categories(&pool).await?;
        Ok(Self { pool })
    }

    #[cfg(test)]
    pub async fn open_in_memory() -> DomainResult<Self> {
        // A pool of `:memory:` connections would each get a separate database,
        // so use a unique temporary file that shares the schema across the pool.
        use std::sync::atomic::{AtomicU64, Ordering};
        static COUNTER: AtomicU64 = AtomicU64::new(0);
        let unique = COUNTER.fetch_add(1, Ordering::Relaxed);
        let path = std::env::temp_dir().join(format!(
            "sustenance-test-{}-{}-{}.db",
            std::process::id(),
            now(),
            unique
        ));
        let path = path.to_str().unwrap();
        let options = SqliteConnectOptions::new()
            .filename(path)
            .journal_mode(sqlx::sqlite::SqliteJournalMode::Wal)
            .foreign_keys(true)
            .busy_timeout(std::time::Duration::from_secs(5))
            .create_if_missing(true);
        let pool = SqlitePool::connect_with(options).await.map_err(db_error)?;
        MIGRATOR.run(&pool).await.map_err(migrate_error)?;
        seed_default_categories(&pool).await?;
        seed_default_meal_categories(&pool).await?;
        Ok(Self { pool })
    }
}

impl SqliteDatabase {
    /// Runs `operation` inside a single transaction, committing on success and
    /// rolling back on error. Multiple repositories can participate in the same
    /// transaction so their writes commit together atomically.
    pub async fn run<T, F>(&self, operation: F) -> DomainResult<T>
    where
        T: Send + 'static,
        F: for<'a> FnOnce(
                &'a mut SqliteConnection,
            )
                -> Pin<Box<dyn Future<Output = DomainResult<T>> + Send + 'a>>
            + Send
            + 'static,
    {
        let mut connection = self.pool.acquire().await.map_err(db_error)?;
        let mut transaction = connection.begin().await.map_err(db_error)?;
        let result = operation(&mut transaction).await;
        match result {
            Ok(value) => {
                transaction.commit().await.map_err(db_error)?;
                Ok(value)
            }
            Err(error) => {
                transaction.rollback().await.map_err(db_error)?;
                Err(error)
            }
        }
    }
}

/// Inserts the default global categories once, if the categories table is empty.
async fn seed_default_categories(pool: &SqlitePool) -> DomainResult<()> {
    let count: i64 = sqlx::query("SELECT COUNT(*) FROM categories")
        .fetch_one(pool)
        .await
        .map_err(db_error)?
        .get(0);
    if count > 0 {
        return Ok(());
    }
    for (position, category_name) in DEFAULT_CATEGORIES.iter().enumerate() {
        sqlx::query("INSERT INTO categories (name, position, created_at) VALUES (?1, ?2, ?3)")
            .bind(category_name)
            .bind(position as i64)
            .bind(now())
            .execute(pool)
            .await
            .map_err(db_error)?;
    }
    Ok(())
}

/// Inserts the default meal categories once, if the meal_categories table is empty.
async fn seed_default_meal_categories(pool: &SqlitePool) -> DomainResult<()> {
    let count: i64 = sqlx::query("SELECT COUNT(*) FROM meal_categories")
        .fetch_one(pool)
        .await
        .map_err(db_error)?
        .get(0);
    if count > 0 {
        return Ok(());
    }
    for (position, category_name) in DEFAULT_MEAL_CATEGORIES.iter().enumerate() {
        sqlx::query("INSERT INTO meal_categories (name, position, created_at) VALUES (?1, ?2, ?3)")
            .bind(category_name)
            .bind(position as i64)
            .bind(now())
            .execute(pool)
            .await
            .map_err(db_error)?;
    }
    Ok(())
}

#[derive(Clone, Copy)]
pub struct SqliteUserRepository;

#[async_trait]
impl UserRepository for SqliteUserRepository {
    async fn create_user(
        &self,
        txn: &mut SqliteConnection,
        email: String,
        display_name: String,
        password_hash: String,
    ) -> DomainResult<User> {
        // Generate a random, high-entropy user handle per the WebAuthn spec so
        // the value embedded in authenticators is opaque and unguessable.
        let user_handle = new_user_handle();
        let result = sqlx::query(
            "INSERT INTO users (email, display_name, password_hash, user_handle, created_at)
             VALUES (?1, ?2, ?3, ?4, ?5)",
        )
        .bind(&email)
        .bind(&display_name)
        .bind(&password_hash)
        .bind(&user_handle)
        .bind(now())
        .execute(&mut *txn)
        .await;
        match result {
            Ok(_) => {
                let id = sqlx::query("SELECT last_insert_rowid()")
                    .fetch_one(&mut *txn)
                    .await
                    .map_err(db_error)?
                    .get::<i64, _>(0);
                Ok(User {
                    id,
                    email,
                    display_name,
                    user_handle,
                })
            }
            Err(error) if is_unique_violation(&error) => Err(DomainError::Conflict),
            Err(error) => Err(db_error(error)),
        }
    }

    async fn find_user_by_email(
        &self,
        txn: &mut SqliteConnection,
        email: String,
    ) -> DomainResult<Option<(User, String)>> {
        let row = sqlx::query(
            "SELECT id, email, display_name, user_handle, password_hash
             FROM users WHERE email = ?1 COLLATE NOCASE",
        )
        .bind(&email)
        .fetch_optional(&mut *txn)
        .await
        .map_err(db_error)?;
        Ok(row.map(|row| {
            (
                User {
                    id: row.get(0),
                    email: row.get(1),
                    display_name: row.get(2),
                    user_handle: row.get(3),
                },
                row.get(4),
            )
        }))
    }

    async fn find_user_by_handle(
        &self,
        txn: &mut SqliteConnection,
        user_handle: Vec<u8>,
    ) -> DomainResult<Option<User>> {
        let row = sqlx::query(
            "SELECT id, email, display_name, user_handle
             FROM users WHERE user_handle = ?1",
        )
        .bind(&user_handle)
        .fetch_optional(&mut *txn)
        .await
        .map_err(db_error)?;
        Ok(row.map(|row| User {
            id: row.get(0),
            email: row.get(1),
            display_name: row.get(2),
            user_handle: row.get(3),
        }))
    }

    async fn update_password_hash(
        &self,
        txn: &mut SqliteConnection,
        user_id: i64,
        password_hash: String,
    ) -> DomainResult<()> {
        sqlx::query("UPDATE users SET password_hash = ?1 WHERE id = ?2")
            .bind(&password_hash)
            .bind(user_id)
            .execute(&mut *txn)
            .await
            .map_err(db_error)?;
        Ok(())
    }

    async fn has_users(&self, txn: &mut SqliteConnection) -> DomainResult<bool> {
        let row = sqlx::query("SELECT EXISTS(SELECT 1 FROM users)")
            .fetch_one(&mut *txn)
            .await
            .map_err(db_error)?;
        Ok(row.get::<i64, _>(0) != 0)
    }
}

#[derive(Clone, Copy)]
pub struct SqlitePasskeyRepository;

#[async_trait]
impl PasskeyRepository for SqlitePasskeyRepository {
    async fn create_passkey(
        &self,
        txn: &mut SqliteConnection,
        user_id: i64,
        credential_id: String,
        credential: String,
        counter: i64,
    ) -> DomainResult<Passkey> {
        let result = sqlx::query(
            "INSERT INTO passkeys (user_id, credential_id, credential, counter, created_at)
             VALUES (?1, ?2, ?3, ?4, ?5)",
        )
        .bind(user_id)
        .bind(&credential_id)
        .bind(&credential)
        .bind(counter)
        .bind(now())
        .execute(&mut *txn)
        .await;
        match result {
            Ok(_) => {
                let id = sqlx::query("SELECT last_insert_rowid()")
                    .fetch_one(&mut *txn)
                    .await
                    .map_err(db_error)?
                    .get::<i64, _>(0);
                Ok(Passkey {
                    id,
                    user_id,
                    credential_id,
                    credential,
                    counter,
                })
            }
            Err(error) if is_unique_violation(&error) => Err(DomainError::Conflict),
            Err(error) => Err(db_error(error)),
        }
    }

    async fn find_by_credential_id(
        &self,
        txn: &mut SqliteConnection,
        credential_id: String,
    ) -> DomainResult<Option<Passkey>> {
        let row = sqlx::query(
            "SELECT id, user_id, credential_id, credential, counter
             FROM passkeys WHERE credential_id = ?1",
        )
        .bind(&credential_id)
        .fetch_optional(&mut *txn)
        .await
        .map_err(db_error)?;
        Ok(row.map(|row| Passkey {
            id: row.get(0),
            user_id: row.get(1),
            credential_id: row.get(2),
            credential: row.get(3),
            counter: row.get(4),
        }))
    }

    async fn list_for_user(
        &self,
        txn: &mut SqliteConnection,
        user_id: i64,
    ) -> DomainResult<Vec<Passkey>> {
        let rows = sqlx::query(
            "SELECT id, user_id, credential_id, credential, counter
             FROM passkeys WHERE user_id = ?1 ORDER BY id ASC",
        )
        .bind(user_id)
        .fetch_all(&mut *txn)
        .await
        .map_err(db_error)?;
        Ok(rows
            .into_iter()
            .map(|row| Passkey {
                id: row.get(0),
                user_id: row.get(1),
                credential_id: row.get(2),
                credential: row.get(3),
                counter: row.get(4),
            })
            .collect())
    }

    async fn delete_passkey(
        &self,
        txn: &mut SqliteConnection,
        user_id: i64,
        passkey_id: i64,
    ) -> DomainResult<()> {
        let changed = sqlx::query("DELETE FROM passkeys WHERE id = ?1 AND user_id = ?2")
            .bind(passkey_id)
            .bind(user_id)
            .execute(&mut *txn)
            .await
            .map_err(db_error)?
            .rows_affected();
        if changed == 0 {
            return Err(DomainError::NotFound);
        }
        Ok(())
    }
}

#[derive(Clone, Copy)]
pub struct SqliteSessionRepository;

#[async_trait]
impl SessionRepository for SqliteSessionRepository {
    async fn create_session(
        &self,
        txn: &mut SqliteConnection,
        user_id: i64,
    ) -> DomainResult<(String, String)> {
        let session_token = hex::encode(crate::security::new_secret());
        let csrf_token = hex::encode(crate::security::new_secret());
        sqlx::query(
            "INSERT INTO sessions (token_hash, user_id, csrf_token, expires_at)
             VALUES (?1, ?2, ?3, ?4)",
        )
        .bind(hash_secret(&session_token))
        .bind(user_id)
        .bind(hex::decode(&csrf_token).expect("csrf_token is valid hex"))
        .bind(now() + 60 * 60 * 24 * 30)
        .execute(&mut *txn)
        .await
        .map_err(db_error)?;
        Ok((session_token, csrf_token))
    }

    async fn session_user(
        &self,
        txn: &mut SqliteConnection,
        session_token: String,
    ) -> DomainResult<Option<SessionUser>> {
        let row = sqlx::query(
            "SELECT u.id, u.email, u.display_name, u.user_handle, s.csrf_token
             FROM sessions s
             JOIN users u ON u.id = s.user_id
             WHERE s.token_hash = ?1 AND s.expires_at > ?2",
        )
        .bind(hash_secret(&session_token))
        .bind(now())
        .fetch_optional(&mut *txn)
        .await
        .map_err(db_error)?;
        Ok(row.map(|row| SessionUser {
            user: User {
                id: row.get(0),
                email: row.get(1),
                display_name: row.get(2),
                user_handle: row.get(3),
            },
            csrf_token: hex::encode(row.get::<Vec<u8>, _>(4)),
        }))
    }

    async fn delete_session(
        &self,
        txn: &mut SqliteConnection,
        session_token: String,
    ) -> DomainResult<()> {
        sqlx::query("DELETE FROM sessions WHERE token_hash = ?1")
            .bind(hash_secret(&session_token))
            .execute(&mut *txn)
            .await
            .map_err(db_error)?;
        Ok(())
    }
}

#[derive(Clone, Copy)]
pub struct SqliteListRepository;

#[async_trait]
impl ListRepository for SqliteListRepository {
    async fn list_summaries(&self, txn: &mut SqliteConnection) -> DomainResult<Vec<GroceryList>> {
        let rows = sqlx::query(
            "SELECT l.id, l.name, l.revision
             FROM lists l
             ORDER BY l.created_at DESC",
        )
        .fetch_all(&mut *txn)
        .await
        .map_err(db_error)?;
        Ok(rows
            .into_iter()
            .map(|row| GroceryList {
                id: row.get(0),
                name: row.get(1),
                revision: row.get(2),
            })
            .collect())
    }

    async fn create_list(
        &self,
        txn: &mut SqliteConnection,
        name: String,
    ) -> DomainResult<GroceryList> {
        sqlx::query("INSERT INTO lists (name, revision, created_at) VALUES (?1, 0, ?2)")
            .bind(&name)
            .bind(now())
            .execute(&mut *txn)
            .await
            .map_err(db_error)?;
        let list_id = sqlx::query("SELECT last_insert_rowid()")
            .fetch_one(&mut *txn)
            .await
            .map_err(db_error)?
            .get::<i64, _>(0);
        Ok(GroceryList {
            id: list_id,
            name,
            revision: 0,
        })
    }

    async fn get_list(
        &self,
        txn: &mut SqliteConnection,
        list_id: i64,
    ) -> DomainResult<Option<GroceryList>> {
        let row = sqlx::query(
            "SELECT l.id, l.name, l.revision
             FROM lists l
             WHERE l.id = ?1",
        )
        .bind(list_id)
        .fetch_optional(&mut *txn)
        .await
        .map_err(db_error)?;
        Ok(row.map(|row| GroceryList {
            id: row.get(0),
            name: row.get(1),
            revision: row.get(2),
        }))
    }
}

#[derive(Clone, Copy)]
pub struct SqliteCategoryRepository;

#[async_trait]
impl CategoryRepository for SqliteCategoryRepository {
    async fn categories(&self, txn: &mut SqliteConnection) -> DomainResult<Vec<Category>> {
        let rows = sqlx::query(
            "SELECT id, name
             FROM categories
             ORDER BY position ASC, name COLLATE NOCASE ASC",
        )
        .fetch_all(&mut *txn)
        .await
        .map_err(db_error)?;
        Ok(rows
            .into_iter()
            .map(|row| Category {
                id: row.get(0),
                name: row.get(1),
            })
            .collect())
    }

    async fn create_category(&self, txn: &mut SqliteConnection, name: String) -> DomainResult<i64> {
        let position: i64 = sqlx::query("SELECT COALESCE(MAX(position), -1) + 1 FROM categories")
            .fetch_one(&mut *txn)
            .await
            .map_err(db_error)?
            .get(0);
        let result = sqlx::query(
            "INSERT INTO categories (name, position, created_at)
             VALUES (?1, ?2, ?3)",
        )
        .bind(&name)
        .bind(position)
        .bind(now())
        .execute(&mut *txn)
        .await;
        match result {
            Ok(_) => {}
            Err(error) if is_unique_violation(&error) => return Err(DomainError::Conflict),
            Err(error) => return Err(db_error(error)),
        }
        let id = sqlx::query("SELECT last_insert_rowid()")
            .fetch_one(&mut *txn)
            .await
            .map_err(db_error)?
            .get::<i64, _>(0);
        Ok(id)
    }
}

#[derive(Clone, Copy)]
pub struct SqliteItemRepository;

#[async_trait]
impl ItemRepository for SqliteItemRepository {
    async fn items(&self, txn: &mut SqliteConnection, list_id: i64) -> DomainResult<Vec<Item>> {
        let rows = sqlx::query(
            "SELECT id, list_id, name, quantity, note, category_id, checked, version
             FROM items
             WHERE list_id = ?1
             ORDER BY position ASC, created_at ASC",
        )
        .bind(list_id)
        .fetch_all(&mut *txn)
        .await
        .map_err(db_error)?;
        Ok(rows
            .into_iter()
            .map(|row| Item {
                id: row.get(0),
                list_id: row.get(1),
                name: row.get(2),
                quantity: row.get(3),
                note: row.get(4),
                category_id: row.get(5),
                checked: row.get::<i64, _>(6) != 0,
                version: row.get(7),
            })
            .collect())
    }

    async fn add_item(
        &self,
        txn: &mut SqliteConnection,
        list_id: i64,
        name: String,
        quantity: String,
        note: String,
        category_id: Option<i64>,
    ) -> DomainResult<i64> {
        ensure_category(txn, category_id).await?;
        let position: i64 =
            sqlx::query("SELECT COALESCE(MAX(position), -1) + 1 FROM items WHERE list_id = ?1")
                .bind(list_id)
                .fetch_one(&mut *txn)
                .await
                .map_err(db_error)?
                .get(0);
        sqlx::query(
            "INSERT INTO items
             (list_id, name, quantity, note, category_id, checked, version, position, created_at, updated_at)
             VALUES (?1, ?2, ?3, ?4, ?5, 0, 1, ?6, ?7, ?7)",
        )
        .bind(list_id)
        .bind(&name)
        .bind(&quantity)
        .bind(&note)
        .bind(category_id)
        .bind(position)
        .bind(now())
        .execute(&mut *txn)
        .await
        .map_err(db_error)?;
        bump_revision(txn, list_id).await
    }

    async fn add_items_bulk(
        &self,
        txn: &mut SqliteConnection,
        list_id: i64,
        items: Vec<NewItem>,
    ) -> DomainResult<i64> {
        let mut position: i64 =
            sqlx::query("SELECT COALESCE(MAX(position), -1) + 1 FROM items WHERE list_id = ?1")
                .bind(list_id)
                .fetch_one(&mut *txn)
                .await
                .map_err(db_error)?
                .get(0);
        let now = now();
        for item in items {
            ensure_category(txn, item.category_id).await?;
            sqlx::query(
                "INSERT INTO items
                 (list_id, name, quantity, note, category_id, checked, version, position, list_meal_id, created_at, updated_at)
                 VALUES (?1, ?2, ?3, ?4, ?5, 0, 1, ?6, ?7, ?8, ?8)",
            )
            .bind(list_id)
            .bind(&item.name)
            .bind(&item.quantity)
            .bind(&item.note)
            .bind(item.category_id)
            .bind(position)
            .bind(item.list_meal_id)
            .bind(now)
            .execute(&mut *txn)
            .await
            .map_err(db_error)?;
            position += 1;
        }
        bump_revision(txn, list_id).await
    }

    async fn set_item_checked(
        &self,
        txn: &mut SqliteConnection,
        list_id: i64,
        item_id: i64,
        checked: bool,
    ) -> DomainResult<i64> {
        let changed = sqlx::query(
            "UPDATE items
             SET checked = ?1, version = version + 1, updated_at = ?2
             WHERE id = ?3 AND list_id = ?4",
        )
        .bind(checked as i64)
        .bind(now())
        .bind(item_id)
        .bind(list_id)
        .execute(&mut *txn)
        .await
        .map_err(db_error)?
        .rows_affected();
        if changed == 0 {
            return Err(DomainError::NotFound);
        }
        bump_revision(txn, list_id).await
    }

    async fn update_item(
        &self,
        txn: &mut SqliteConnection,
        list_id: i64,
        item_id: i64,
        name: String,
        quantity: String,
        note: String,
        category_id: Option<i64>,
    ) -> DomainResult<i64> {
        ensure_category(txn, category_id).await?;
        let changed = sqlx::query(
            "UPDATE items
             SET name = ?1, quantity = ?2, note = ?3, category_id = ?4,
                 version = version + 1, updated_at = ?5
             WHERE id = ?6 AND list_id = ?7",
        )
        .bind(&name)
        .bind(&quantity)
        .bind(&note)
        .bind(category_id)
        .bind(now())
        .bind(item_id)
        .bind(list_id)
        .execute(&mut *txn)
        .await
        .map_err(db_error)?
        .rows_affected();
        if changed == 0 {
            return Err(DomainError::NotFound);
        }
        bump_revision(txn, list_id).await
    }

    async fn delete_item(
        &self,
        txn: &mut SqliteConnection,
        list_id: i64,
        item_id: i64,
    ) -> DomainResult<i64> {
        let changed = sqlx::query("DELETE FROM items WHERE id = ?1 AND list_id = ?2")
            .bind(item_id)
            .bind(list_id)
            .execute(&mut *txn)
            .await
            .map_err(db_error)?
            .rows_affected();
        if changed == 0 {
            return Err(DomainError::NotFound);
        }
        bump_revision(txn, list_id).await
    }
}

#[derive(Clone, Copy)]
pub struct SqliteListMealRepository;

#[async_trait]
impl ListMealRepository for SqliteListMealRepository {
    async fn list_meals(
        &self,
        txn: &mut SqliteConnection,
        list_id: i64,
    ) -> DomainResult<Vec<ListMeal>> {
        let rows = sqlx::query(
            "SELECT id, meal_id, name, created_at
             FROM list_meals
             WHERE list_id = ?1
             ORDER BY created_at ASC, id ASC",
        )
        .bind(list_id)
        .fetch_all(&mut *txn)
        .await
        .map_err(db_error)?;
        Ok(rows
            .into_iter()
            .map(|row| ListMeal {
                id: row.get(0),
                meal_id: row.get(1),
                name: row.get(2),
                created_at: row.get(3),
            })
            .collect())
    }

    async fn add_meal(
        &self,
        txn: &mut SqliteConnection,
        list_id: i64,
        meal_id: i64,
        name: String,
    ) -> DomainResult<i64> {
        sqlx::query(
            "INSERT INTO list_meals (list_id, meal_id, name, created_at)
             VALUES (?1, ?2, ?3, ?4)",
        )
        .bind(list_id)
        .bind(meal_id)
        .bind(&name)
        .bind(now())
        .execute(&mut *txn)
        .await
        .map_err(db_error)?;
        let id = sqlx::query("SELECT last_insert_rowid()")
            .fetch_one(&mut *txn)
            .await
            .map_err(db_error)?
            .get::<i64, _>(0);
        Ok(id)
    }

    async fn remove_meal(
        &self,
        txn: &mut SqliteConnection,
        list_id: i64,
        list_meal_id: i64,
    ) -> DomainResult<i64> {
        let changed = sqlx::query("DELETE FROM list_meals WHERE id = ?1 AND list_id = ?2")
            .bind(list_meal_id)
            .bind(list_id)
            .execute(&mut *txn)
            .await
            .map_err(db_error)?
            .rows_affected();
        if changed == 0 {
            return Err(DomainError::NotFound);
        }
        bump_revision(txn, list_id).await
    }
}

#[derive(Clone, Copy)]
pub struct SqliteInvitationRepository;

#[async_trait]
impl InvitationRepository for SqliteInvitationRepository {
    async fn create_invitation(
        &self,
        txn: &mut SqliteConnection,
        created_by: i64,
        token: String,
    ) -> DomainResult<i64> {
        let expires_at = now() + 60 * 60 * 24 * 7;
        sqlx::query(
            "INSERT INTO invitations (token_hash, created_by, expires_at)
             VALUES (?1, ?2, ?3)",
        )
        .bind(hash_secret(&token))
        .bind(created_by)
        .bind(expires_at)
        .execute(&mut *txn)
        .await
        .map_err(db_error)?;
        Ok(expires_at)
    }

    async fn invitation(&self, txn: &mut SqliteConnection, token: String) -> DomainResult<bool> {
        let row = sqlx::query(
            "SELECT 1 FROM invitations
             WHERE token_hash = ?1 AND expires_at > ?2",
        )
        .bind(hash_secret(&token))
        .bind(now())
        .fetch_optional(&mut *txn)
        .await
        .map_err(db_error)?;
        Ok(row.is_some())
    }

    async fn accept_invitation(
        &self,
        txn: &mut SqliteConnection,
        token: String,
    ) -> DomainResult<()> {
        let valid = sqlx::query(
            "SELECT 1 FROM invitations
             WHERE token_hash = ?1 AND expires_at > ?2",
        )
        .bind(hash_secret(&token))
        .bind(now())
        .fetch_optional(&mut *txn)
        .await
        .map_err(db_error)?
        .is_some();
        if !valid {
            return Err(DomainError::NotFound);
        }
        sqlx::query("DELETE FROM invitations WHERE token_hash = ?1")
            .bind(hash_secret(&token))
            .execute(&mut *txn)
            .await
            .map_err(db_error)?;
        Ok(())
    }
}

#[derive(Clone, Copy)]
pub struct SqliteMealCategoryRepository;

#[async_trait]
impl MealCategoryRepository for SqliteMealCategoryRepository {
    async fn meal_categories(&self, txn: &mut SqliteConnection) -> DomainResult<Vec<MealCategory>> {
        let rows = sqlx::query(
            "SELECT id, name
             FROM meal_categories
             ORDER BY position ASC, name COLLATE NOCASE ASC",
        )
        .fetch_all(&mut *txn)
        .await
        .map_err(db_error)?;
        Ok(rows
            .into_iter()
            .map(|row| MealCategory {
                id: row.get(0),
                name: row.get(1),
            })
            .collect())
    }

    async fn create_meal_category(
        &self,
        txn: &mut SqliteConnection,
        name: String,
    ) -> DomainResult<i64> {
        let position: i64 =
            sqlx::query("SELECT COALESCE(MAX(position), -1) + 1 FROM meal_categories")
                .fetch_one(&mut *txn)
                .await
                .map_err(db_error)?
                .get(0);
        let result = sqlx::query(
            "INSERT INTO meal_categories (name, position, created_at)
             VALUES (?1, ?2, ?3)",
        )
        .bind(&name)
        .bind(position)
        .bind(now())
        .execute(&mut *txn)
        .await;
        match result {
            Ok(_) => {}
            Err(error) if is_unique_violation(&error) => return Err(DomainError::Conflict),
            Err(error) => return Err(db_error(error)),
        }
        Ok(sqlx::query("SELECT last_insert_rowid()")
            .fetch_one(&mut *txn)
            .await
            .map_err(db_error)?
            .get::<i64, _>(0))
    }

    async fn delete_meal_category(
        &self,
        txn: &mut SqliteConnection,
        category_id: i64,
    ) -> DomainResult<()> {
        let changed = sqlx::query("DELETE FROM meal_categories WHERE id = ?1")
            .bind(category_id)
            .execute(&mut *txn)
            .await
            .map_err(db_error)?
            .rows_affected();
        if changed == 0 {
            return Err(DomainError::NotFound);
        }
        Ok(())
    }
}

#[derive(Clone, Copy)]
pub struct SqliteMealRepository;

#[async_trait]
impl MealRepository for SqliteMealRepository {
    async fn create_meal(
        &self,
        txn: &mut SqliteConnection,
        name: String,
        description: String,
        category_id: Option<i64>,
    ) -> DomainResult<Meal> {
        let now = now();
        sqlx::query(
            "INSERT INTO meals (name, description, category_id, created_at, updated_at)
             VALUES (?1, ?2, ?3, ?4, ?4)",
        )
        .bind(&name)
        .bind(&description)
        .bind(category_id)
        .bind(now)
        .execute(&mut *txn)
        .await
        .map_err(db_error)?;
        let id = sqlx::query("SELECT last_insert_rowid()")
            .fetch_one(&mut *txn)
            .await
            .map_err(db_error)?
            .get::<i64, _>(0);
        Ok(Meal {
            id,
            name,
            description,
            category_id,
            ingredients: Vec::new(),
        })
    }

    async fn get_meal(
        &self,
        txn: &mut SqliteConnection,
        meal_id: i64,
    ) -> DomainResult<Option<Meal>> {
        let row = sqlx::query(
            "SELECT id, name, description, category_id
             FROM meals
             WHERE id = ?1",
        )
        .bind(meal_id)
        .fetch_optional(&mut *txn)
        .await
        .map_err(db_error)?;
        let Some(row) = row else {
            return Ok(None);
        };
        let meal = Meal {
            id: row.get(0),
            name: row.get(1),
            description: row.get(2),
            category_id: row.get(3),
            ingredients: Vec::new(),
        };
        let ingredients = SqliteMealIngredientRepository
            .ingredients_for_meal(txn, meal.id)
            .await?;
        Ok(Some(Meal {
            ingredients,
            ..meal
        }))
    }

    async fn list_meals(&self, txn: &mut SqliteConnection) -> DomainResult<Vec<Meal>> {
        let rows = sqlx::query(
            "SELECT id, name, description, category_id
             FROM meals
             ORDER BY name COLLATE NOCASE ASC",
        )
        .fetch_all(&mut *txn)
        .await
        .map_err(db_error)?;
        let mut meals = Vec::new();
        for row in rows {
            let meal = Meal {
                id: row.get(0),
                name: row.get(1),
                description: row.get(2),
                category_id: row.get(3),
                ingredients: Vec::new(),
            };
            let ingredients = SqliteMealIngredientRepository
                .ingredients_for_meal(txn, meal.id)
                .await?;
            meals.push(Meal {
                ingredients,
                ..meal
            });
        }
        Ok(meals)
    }

    async fn update_meal(
        &self,
        txn: &mut SqliteConnection,
        meal_id: i64,
        name: String,
        description: String,
        category_id: Option<i64>,
    ) -> DomainResult<()> {
        let changed = sqlx::query(
            "UPDATE meals
             SET name = ?1, description = ?2, category_id = ?3, updated_at = ?4
             WHERE id = ?5",
        )
        .bind(&name)
        .bind(&description)
        .bind(category_id)
        .bind(now())
        .bind(meal_id)
        .execute(&mut *txn)
        .await
        .map_err(db_error)?
        .rows_affected();
        if changed == 0 {
            return Err(DomainError::NotFound);
        }
        Ok(())
    }

    async fn delete_meal(&self, txn: &mut SqliteConnection, meal_id: i64) -> DomainResult<()> {
        let changed = sqlx::query("DELETE FROM meals WHERE id = ?1")
            .bind(meal_id)
            .execute(&mut *txn)
            .await
            .map_err(db_error)?
            .rows_affected();
        if changed == 0 {
            return Err(DomainError::NotFound);
        }
        Ok(())
    }
}

#[derive(Clone, Copy)]
pub struct SqliteMealIngredientRepository;

#[async_trait]
impl MealIngredientRepository for SqliteMealIngredientRepository {
    async fn ingredients_for_meal(
        &self,
        txn: &mut SqliteConnection,
        meal_id: i64,
    ) -> DomainResult<Vec<MealIngredient>> {
        let rows = sqlx::query(
            "SELECT id, name, quantity, note, category_id
             FROM meal_ingredients
             WHERE meal_id = ?1
             ORDER BY position ASC, id ASC",
        )
        .bind(meal_id)
        .fetch_all(&mut *txn)
        .await
        .map_err(db_error)?;
        Ok(rows
            .into_iter()
            .map(|row| MealIngredient {
                id: row.get(0),
                name: row.get(1),
                quantity: row.get(2),
                note: row.get(3),
                category_id: row.get(4),
            })
            .collect())
    }

    async fn add_ingredient(
        &self,
        txn: &mut SqliteConnection,
        meal_id: i64,
        name: String,
        quantity: String,
        note: String,
        category_id: Option<i64>,
    ) -> DomainResult<i64> {
        ensure_category(txn, category_id).await?;
        let position: i64 = sqlx::query(
            "SELECT COALESCE(MAX(position), -1) + 1
             FROM meal_ingredients WHERE meal_id = ?1",
        )
        .bind(meal_id)
        .fetch_one(&mut *txn)
        .await
        .map_err(db_error)?
        .get(0);
        sqlx::query(
            "INSERT INTO meal_ingredients (meal_id, name, quantity, note, category_id, position)
             VALUES (?1, ?2, ?3, ?4, ?5, ?6)",
        )
        .bind(meal_id)
        .bind(&name)
        .bind(&quantity)
        .bind(&note)
        .bind(category_id)
        .bind(position)
        .execute(&mut *txn)
        .await
        .map_err(db_error)?;
        let id = sqlx::query("SELECT last_insert_rowid()")
            .fetch_one(&mut *txn)
            .await
            .map_err(db_error)?
            .get::<i64, _>(0);
        Ok(id)
    }

    async fn update_ingredient(
        &self,
        txn: &mut SqliteConnection,
        meal_id: i64,
        ingredient_id: i64,
        name: String,
        quantity: String,
        note: String,
        category_id: Option<i64>,
    ) -> DomainResult<()> {
        ensure_category(txn, category_id).await?;
        let changed = sqlx::query(
            "UPDATE meal_ingredients
             SET name = ?1, quantity = ?2, note = ?3, category_id = ?4
             WHERE id = ?5 AND meal_id = ?6",
        )
        .bind(&name)
        .bind(&quantity)
        .bind(&note)
        .bind(category_id)
        .bind(ingredient_id)
        .bind(meal_id)
        .execute(&mut *txn)
        .await
        .map_err(db_error)?
        .rows_affected();
        if changed == 0 {
            return Err(DomainError::NotFound);
        }
        Ok(())
    }

    async fn delete_ingredient(
        &self,
        txn: &mut SqliteConnection,
        meal_id: i64,
        ingredient_id: i64,
    ) -> DomainResult<()> {
        let changed = sqlx::query("DELETE FROM meal_ingredients WHERE id = ?1 AND meal_id = ?2")
            .bind(ingredient_id)
            .bind(meal_id)
            .execute(&mut *txn)
            .await
            .map_err(db_error)?
            .rows_affected();
        if changed == 0 {
            return Err(DomainError::NotFound);
        }
        Ok(())
    }
}

async fn ensure_category(txn: &mut SqliteConnection, category_id: Option<i64>) -> DomainResult<()> {
    let Some(category_id) = category_id else {
        return Ok(());
    };
    let row = sqlx::query("SELECT 1 FROM categories WHERE id = ?1")
        .bind(category_id)
        .fetch_optional(&mut *txn)
        .await
        .map_err(db_error)?;
    if row.is_none() {
        return Err(DomainError::NotFound);
    }
    Ok(())
}

async fn bump_revision(txn: &mut SqliteConnection, list_id: i64) -> DomainResult<i64> {
    sqlx::query("UPDATE lists SET revision = revision + 1 WHERE id = ?1")
        .bind(list_id)
        .execute(&mut *txn)
        .await
        .map_err(db_error)?;
    let row = sqlx::query("SELECT revision FROM lists WHERE id = ?1")
        .bind(list_id)
        .fetch_one(&mut *txn)
        .await
        .map_err(db_error)?;
    Ok(row.get(0))
}

const DEFAULT_CATEGORIES: &[&str] = &[
    "Produce",
    "Meat & seafood",
    "Dairy & eggs",
    "Pantry",
    "Frozen",
    "Household",
];

const DEFAULT_MEAL_CATEGORIES: &[&str] =
    &["Beef", "Chicken", "Pasta", "Sandwiches", "Salads", "Soups"];

fn hash_secret(secret: &str) -> Vec<u8> {
    let mut hasher = Sha256::new();
    hasher.update(secret.as_bytes());
    hasher.finalize().to_vec()
}

fn now() -> i64 {
    SystemTime::now()
        .duration_since(UNIX_EPOCH)
        .unwrap_or_default()
        .as_secs() as i64
}

/// A random, high-entropy user handle used as the WebAuthn userHandle.
/// 32 random bytes, which is exactly the 64-byte maximum the WebAuthn spec
/// allows for a userHandle while still providing 256 bits of entropy. Opaque
/// and unguessable per the spec. Stored as raw bytes.
fn new_user_handle() -> Vec<u8> {
    use rand::RngCore;
    let mut bytes = [0_u8; 32];
    rand::rngs::OsRng.fill_bytes(&mut bytes);
    bytes.to_vec()
}

fn is_unique_violation(error: &sqlx::Error) -> bool {
    error
        .as_database_error()
        .map(|database_error| database_error.message().to_uppercase().contains("UNIQUE"))
        .unwrap_or(false)
}

fn db_error(error: sqlx::Error) -> DomainError {
    DomainError::Database(error.to_string())
}

fn migrate_error(error: sqlx::migrate::MigrateError) -> DomainError {
    DomainError::Database(error.to_string())
}

#[cfg(test)]
mod tests {
    use super::*;

    async fn setup() -> SqliteDatabase {
        SqliteDatabase::open_in_memory().await.unwrap()
    }

    async fn create_user(db: &SqliteDatabase, email: &str) -> User {
        let users = SqliteUserRepository;
        let email = email.to_owned();
        db.run(move |txn| {
            let users = users.clone();
            Box::pin(async move {
                users
                    .create_user(txn, email, "Test User".into(), "hash".into())
                    .await
            })
        })
        .await
        .unwrap()
    }

    async fn create_list(db: &SqliteDatabase, name: &str) -> GroceryList {
        let lists = SqliteListRepository;
        let name = name.to_owned();
        db.run(move |txn| {
            let lists = lists.clone();
            Box::pin(async move { lists.create_list(txn, name).await })
        })
        .await
        .unwrap()
    }

    async fn add_item(db: &SqliteDatabase, list_id: i64, name: &str) -> Item {
        let items = SqliteItemRepository;
        let name_for_insert = name.to_owned();
        db.run(move |txn| {
            let items = items.clone();
            Box::pin(async move {
                items
                    .add_item(
                        txn,
                        list_id,
                        name_for_insert,
                        String::new(),
                        String::new(),
                        None,
                    )
                    .await
            })
        })
        .await
        .unwrap();
        let items = SqliteItemRepository;
        db.run(move |txn| {
            let items = items.clone();
            Box::pin(async move { items.items(txn, list_id).await })
        })
        .await
        .unwrap()
        .into_iter()
        .find(|item| item.name == name)
        .unwrap()
    }

    async fn get_items(db: &SqliteDatabase, list_id: i64) -> Vec<Item> {
        let items = SqliteItemRepository;
        db.run(move |txn| {
            let items = items.clone();
            Box::pin(async move { items.items(txn, list_id).await })
        })
        .await
        .unwrap()
    }

    async fn get_categories(db: &SqliteDatabase) -> Vec<Category> {
        let categories = SqliteCategoryRepository;
        db.run(move |txn| {
            let categories = categories.clone();
            Box::pin(async move { categories.categories(txn).await })
        })
        .await
        .unwrap()
    }

    // ---- UserRepository ----

    #[tokio::test]
    async fn create_user_returns_user_with_id() {
        let db = setup().await;
        let user = create_user(&db, "alice@example.com").await;
        assert!(user.id > 0);
        assert_eq!(user.email, "alice@example.com");
        assert_eq!(user.display_name, "Test User");
    }

    #[tokio::test]
    async fn create_user_with_duplicate_email_conflicts() {
        let db = setup().await;
        create_user(&db, "alice@example.com").await;
        let users = SqliteUserRepository;
        let result = db
            .run(move |txn| {
                let users = users.clone();
                Box::pin(async move {
                    users
                        .create_user(
                            txn,
                            "alice@example.com".into(),
                            "Other".into(),
                            "hash".into(),
                        )
                        .await
                })
            })
            .await;
        assert!(matches!(result, Err(DomainError::Conflict)));
    }

    #[tokio::test]
    async fn find_user_by_email_returns_user_and_hash() {
        let db = setup().await;
        create_user(&db, "alice@example.com").await;
        let users = SqliteUserRepository;
        let found = db
            .run(move |txn| {
                let users = users.clone();
                Box::pin(async move {
                    users
                        .find_user_by_email(txn, "alice@example.com".into())
                        .await
                })
            })
            .await
            .unwrap();
        let (user, hash) = found.unwrap();
        assert_eq!(user.email, "alice@example.com");
        assert_eq!(hash, "hash");
    }

    #[tokio::test]
    async fn find_user_by_email_is_case_insensitive() {
        let db = setup().await;
        create_user(&db, "alice@example.com").await;
        let users = SqliteUserRepository;
        let found = db
            .run(move |txn| {
                let users = users.clone();
                Box::pin(async move {
                    users
                        .find_user_by_email(txn, "ALICE@EXAMPLE.COM".into())
                        .await
                })
            })
            .await
            .unwrap();
        assert!(found.is_some());
    }

    #[tokio::test]
    async fn find_user_by_email_returns_none_for_unknown() {
        let db = setup().await;
        let users = SqliteUserRepository;
        let found = db
            .run(move |txn| {
                let users = users.clone();
                Box::pin(async move {
                    users
                        .find_user_by_email(txn, "nobody@example.com".into())
                        .await
                })
            })
            .await
            .unwrap();
        assert!(found.is_none());
    }

    #[tokio::test]
    async fn has_users_reflects_user_count() {
        let db = setup().await;
        let users = SqliteUserRepository;
        let empty = db
            .run(move |txn| {
                let users = users.clone();
                Box::pin(async move { users.has_users(txn).await })
            })
            .await
            .unwrap();
        assert!(!empty);

        create_user(&db, "alice@example.com").await;
        let has = db
            .run(move |txn| {
                let users = users.clone();
                Box::pin(async move { users.has_users(txn).await })
            })
            .await
            .unwrap();
        assert!(has);
    }

    // ---- SessionRepository ----

    #[tokio::test]
    async fn create_and_lookup_session() {
        let db = setup().await;
        let user = create_user(&db, "alice@example.com").await;
        let sessions = SqliteSessionRepository;
        let (token, csrf) = db
            .run(move |txn| {
                let sessions = sessions.clone();
                Box::pin(async move { sessions.create_session(txn, user.id).await })
            })
            .await
            .unwrap();
        assert!(!token.is_empty());
        assert!(!csrf.is_empty());

        let session = db
            .run(move |txn| {
                let sessions = sessions.clone();
                Box::pin(async move { sessions.session_user(txn, token.clone()).await })
            })
            .await
            .unwrap()
            .unwrap();
        assert_eq!(session.user.id, user.id);
        assert_eq!(session.csrf_token, csrf);
    }

    #[tokio::test]
    async fn session_user_returns_none_for_unknown_token() {
        let db = setup().await;
        let sessions = SqliteSessionRepository;
        let session = db
            .run(move |txn| {
                let sessions = sessions.clone();
                Box::pin(async move { sessions.session_user(txn, "bogus".into()).await })
            })
            .await
            .unwrap();
        assert!(session.is_none());
    }

    #[tokio::test]
    async fn delete_session_removes_it() {
        let db = setup().await;
        let user = create_user(&db, "alice@example.com").await;
        let sessions = SqliteSessionRepository;
        let (token, _) = db
            .run(move |txn| {
                let sessions = sessions.clone();
                Box::pin(async move { sessions.create_session(txn, user.id).await })
            })
            .await
            .unwrap();

        let token_for_delete = token.clone();
        db.run(move |txn| {
            let sessions = sessions.clone();
            Box::pin(async move { sessions.delete_session(txn, token_for_delete).await })
        })
        .await
        .unwrap();

        let session = db
            .run(move |txn| {
                let sessions = sessions.clone();
                Box::pin(async move { sessions.session_user(txn, token).await })
            })
            .await
            .unwrap();
        assert!(session.is_none());
    }

    // ---- ListRepository ----

    #[tokio::test]
    async fn create_list_does_not_seed_categories() {
        let db = setup().await;
        // Default categories are seeded globally at startup.
        let before = get_categories(&db).await.len();
        let list = create_list(&db, "Weekly shop").await;
        assert!(list.id > 0);
        assert_eq!(list.revision, 0);
        // Categories are global now; creating a list must not add any.
        assert_eq!(get_categories(&db).await.len(), before);
    }

    #[tokio::test]
    async fn list_summaries_returns_all_lists() {
        let db = setup().await;
        let first = create_list(&db, "First").await;
        let second = create_list(&db, "Second").await;
        let lists = SqliteListRepository;
        let summaries = db
            .run(move |txn| {
                let lists = lists.clone();
                Box::pin(async move { lists.list_summaries(txn).await })
            })
            .await
            .unwrap();
        let mut ids = summaries.iter().map(|l| l.id).collect::<Vec<_>>();
        ids.sort_unstable();
        assert_eq!(ids, vec![first.id, second.id]);
    }

    #[tokio::test]
    async fn get_list_returns_list_or_none() {
        let db = setup().await;
        let list = create_list(&db, "Weekly shop").await;
        let lists = SqliteListRepository;
        let found = db
            .run(move |txn| {
                let lists = lists.clone();
                Box::pin(async move { lists.get_list(txn, list.id).await })
            })
            .await
            .unwrap();
        assert_eq!(found.unwrap().name, "Weekly shop");

        let missing = db
            .run(move |txn| {
                let lists = lists.clone();
                Box::pin(async move { lists.get_list(txn, 9999).await })
            })
            .await
            .unwrap();
        assert!(missing.is_none());
    }

    // ---- CategoryRepository ----

    #[tokio::test]
    async fn create_category_is_global_and_returns_id() {
        let db = setup().await;
        let categories = SqliteCategoryRepository;
        let id = db
            .run(move |txn| {
                let categories = categories.clone();
                Box::pin(async move { categories.create_category(txn, "Bakery".into()).await })
            })
            .await
            .unwrap();
        assert!(id > 0);

        let cats = get_categories(&db).await;
        assert!(cats.iter().any(|c| c.name == "Bakery"));
    }

    #[tokio::test]
    async fn create_duplicate_category_conflicts() {
        let db = setup().await;
        let categories = SqliteCategoryRepository;
        let result = db
            .run(move |txn| {
                let categories = categories.clone();
                Box::pin(async move { categories.create_category(txn, "Produce".into()).await })
            })
            .await;
        assert!(matches!(result, Err(DomainError::Conflict)));
    }

    // ---- MealCategoryRepository ----

    async fn get_meal_categories(db: &SqliteDatabase) -> Vec<MealCategory> {
        let categories = SqliteMealCategoryRepository;
        db.run(move |txn| {
            let categories = categories.clone();
            Box::pin(async move { categories.meal_categories(txn).await })
        })
        .await
        .unwrap()
    }

    #[tokio::test]
    async fn meal_categories_are_seeded_with_defaults() {
        let db = setup().await;
        let categories = get_meal_categories(&db).await;
        let names = categories
            .iter()
            .map(|c| c.name.as_str())
            .collect::<Vec<_>>();
        assert!(names.contains(&"Beef"));
        assert!(names.contains(&"Chicken"));
        assert!(names.contains(&"Pasta"));
        assert!(names.contains(&"Sandwiches"));
        assert!(names.contains(&"Salads"));
        assert!(names.contains(&"Soups"));
    }

    #[tokio::test]
    async fn create_meal_category_returns_id_and_lists() {
        let db = setup().await;
        let categories = SqliteMealCategoryRepository;
        let id = db
            .run(move |txn| {
                let categories = categories.clone();
                Box::pin(async move {
                    categories
                        .create_meal_category(txn, "Breakfast".into())
                        .await
                })
            })
            .await
            .unwrap();
        assert!(id > 0);
        let cats = get_meal_categories(&db).await;
        assert!(cats.iter().any(|c| c.id == id && c.name == "Breakfast"));
    }

    #[tokio::test]
    async fn create_duplicate_meal_category_conflicts() {
        let db = setup().await;
        let categories = SqliteMealCategoryRepository;
        let result = db
            .run(move |txn| {
                let categories = categories.clone();
                Box::pin(async move { categories.create_meal_category(txn, "Beef".into()).await })
            })
            .await;
        assert!(matches!(result, Err(DomainError::Conflict)));
    }

    #[tokio::test]
    async fn delete_meal_category_cascades_to_null_on_meals() {
        let db = setup().await;
        let categories = SqliteMealCategoryRepository;
        let category_id = db
            .run(move |txn| {
                let categories = categories.clone();
                Box::pin(async move {
                    categories
                        .create_meal_category(txn, "Breakfast".into())
                        .await
                })
            })
            .await
            .unwrap();
        let meal = create_meal(&db, "Pancakes").await;
        let meals = SqliteMealRepository;
        db.run(move |txn| {
            let meals = meals.clone();
            Box::pin(async move {
                meals
                    .update_meal(
                        txn,
                        meal.id,
                        "Pancakes".into(),
                        String::new(),
                        Some(category_id),
                    )
                    .await
            })
        })
        .await
        .unwrap();

        db.run(move |txn| {
            let categories = categories.clone();
            Box::pin(async move { categories.delete_meal_category(txn, category_id).await })
        })
        .await
        .unwrap();

        let fetched = db
            .run(move |txn| {
                let meals = meals.clone();
                Box::pin(async move { meals.get_meal(txn, meal.id).await })
            })
            .await
            .unwrap()
            .unwrap();
        assert_eq!(fetched.category_id, None);
    }

    // ---- ItemRepository ----

    #[tokio::test]
    async fn add_item_returns_revision_and_is_listed() {
        let db = setup().await;
        let list = create_list(&db, "Weekly shop").await;
        let items = SqliteItemRepository;
        let revision = db
            .run(move |txn| {
                let items = items.clone();
                Box::pin(async move {
                    items
                        .add_item(
                            txn,
                            list.id,
                            "Milk".into(),
                            "2 litres".into(),
                            "note".into(),
                            None,
                        )
                        .await
                })
            })
            .await
            .unwrap();
        assert_eq!(revision, 1);

        let items = get_items(&db, list.id).await;
        assert_eq!(items.len(), 1);
        assert_eq!(items[0].name, "Milk");
        assert_eq!(items[0].quantity, "2 litres");
        assert_eq!(items[0].note, "note");
        assert!(!items[0].checked);
        assert_eq!(items[0].version, 1);
    }

    #[tokio::test]
    async fn add_item_with_unknown_category_fails() {
        let db = setup().await;
        let list = create_list(&db, "Weekly shop").await;
        let items = SqliteItemRepository;
        let result = db
            .run(move |txn| {
                let items = items.clone();
                Box::pin(async move {
                    items
                        .add_item(
                            txn,
                            list.id,
                            "Milk".into(),
                            String::new(),
                            String::new(),
                            Some(9999),
                        )
                        .await
                })
            })
            .await;
        assert!(matches!(result, Err(DomainError::NotFound)));
    }

    #[tokio::test]
    async fn add_items_bulk_inserts_all_and_bumps_revision_once() {
        let db = setup().await;
        let list = create_list(&db, "Weekly shop").await;
        let items = SqliteItemRepository;
        let new_items = vec![
            NewItem {
                name: "Penne".into(),
                quantity: "500g".into(),
                note: String::new(),
                category_id: None,
                list_meal_id: None,
            },
            NewItem {
                name: "Tomato".into(),
                quantity: "2".into(),
                note: String::new(),
                category_id: None,
                list_meal_id: None,
            },
        ];
        let revision = db
            .run(move |txn| {
                let items = items.clone();
                Box::pin(async move { items.add_items_bulk(txn, list.id, new_items).await })
            })
            .await
            .unwrap();
        assert_eq!(revision, 1);

        let listed = get_items(&db, list.id).await;
        let mut names = listed.iter().map(|i| i.name.clone()).collect::<Vec<_>>();
        names.sort_unstable();
        assert_eq!(names, vec!["Penne".to_owned(), "Tomato".to_owned()]);
    }

    #[tokio::test]
    async fn update_item_changes_fields_and_bumps_version() {
        let db = setup().await;
        let list = create_list(&db, "Weekly shop").await;
        let item = add_item(&db, list.id, "Milk").await;
        let items = SqliteItemRepository;
        let revision = db
            .run(move |txn| {
                let items = items.clone();
                Box::pin(async move {
                    items
                        .update_item(
                            txn,
                            list.id,
                            item.id,
                            "Oat milk".into(),
                            "1 litre".into(),
                            "chilled".into(),
                            None,
                        )
                        .await
                })
            })
            .await
            .unwrap();
        assert_eq!(revision, 2);

        let updated = get_items(&db, list.id).await.remove(0);
        assert_eq!(updated.name, "Oat milk");
        assert_eq!(updated.quantity, "1 litre");
        assert_eq!(updated.note, "chilled");
        assert_eq!(updated.version, 2);
    }

    #[tokio::test]
    async fn update_missing_item_fails() {
        let db = setup().await;
        let list = create_list(&db, "Weekly shop").await;
        let items = SqliteItemRepository;
        let result = db
            .run(move |txn| {
                let items = items.clone();
                Box::pin(async move {
                    items
                        .update_item(
                            txn,
                            list.id,
                            9999,
                            "X".into(),
                            String::new(),
                            String::new(),
                            None,
                        )
                        .await
                })
            })
            .await;
        assert!(matches!(result, Err(DomainError::NotFound)));
    }

    #[tokio::test]
    async fn delete_item_removes_it_and_bumps_revision() {
        let db = setup().await;
        let list = create_list(&db, "Weekly shop").await;
        let item = add_item(&db, list.id, "Milk").await;
        let items = SqliteItemRepository;
        let revision = db
            .run(move |txn| {
                let items = items.clone();
                Box::pin(async move { items.delete_item(txn, list.id, item.id).await })
            })
            .await
            .unwrap();
        assert_eq!(revision, 2);
        assert!(get_items(&db, list.id).await.is_empty());
    }

    #[tokio::test]
    async fn delete_missing_item_fails() {
        let db = setup().await;
        let list = create_list(&db, "Weekly shop").await;
        let items = SqliteItemRepository;
        let result = db
            .run(move |txn| {
                let items = items.clone();
                Box::pin(async move { items.delete_item(txn, list.id, 9999).await })
            })
            .await;
        assert!(matches!(result, Err(DomainError::NotFound)));
    }

    #[tokio::test]
    async fn set_item_checked_on_missing_item_fails() {
        let db = setup().await;
        let list = create_list(&db, "Weekly shop").await;
        let items = SqliteItemRepository;
        let result = db
            .run(move |txn| {
                let items = items.clone();
                Box::pin(async move { items.set_item_checked(txn, list.id, 9999, true).await })
            })
            .await;
        assert!(matches!(result, Err(DomainError::NotFound)));
    }

    // ---- InvitationRepository ----

    #[tokio::test]
    async fn create_invitation_is_valid() {
        let db = setup().await;
        let user = create_user(&db, "alice@example.com").await;
        let invitations = SqliteInvitationRepository;
        let expires = db
            .run(move |txn| {
                let invitations = invitations.clone();
                Box::pin(async move {
                    invitations
                        .create_invitation(txn, user.id, "token-1".into())
                        .await
                })
            })
            .await
            .unwrap();
        assert!(expires > now());

        let valid = db
            .run(move |txn| {
                let invitations = invitations.clone();
                Box::pin(async move { invitations.invitation(txn, "token-1".into()).await })
            })
            .await
            .unwrap();
        assert!(valid);
    }

    #[tokio::test]
    async fn invitation_is_false_for_unknown_token() {
        let db = setup().await;
        let invitations = SqliteInvitationRepository;
        let valid = db
            .run(move |txn| {
                let invitations = invitations.clone();
                Box::pin(async move { invitations.invitation(txn, "bogus".into()).await })
            })
            .await
            .unwrap();
        assert!(!valid);
    }

    #[tokio::test]
    async fn accept_invitation_consumes_it() {
        let db = setup().await;
        let user = create_user(&db, "alice@example.com").await;
        let invitations = SqliteInvitationRepository;
        db.run(move |txn| {
            let invitations = invitations.clone();
            Box::pin(async move {
                invitations
                    .create_invitation(txn, user.id, "token-1".into())
                    .await
            })
        })
        .await
        .unwrap();

        db.run(move |txn| {
            let invitations = invitations.clone();
            Box::pin(async move { invitations.accept_invitation(txn, "token-1".into()).await })
        })
        .await
        .unwrap();

        let valid = db
            .run(move |txn| {
                let invitations = invitations.clone();
                Box::pin(async move { invitations.invitation(txn, "token-1".into()).await })
            })
            .await
            .unwrap();
        assert!(!valid);
    }

    #[tokio::test]
    async fn accept_invitation_for_unknown_token_fails() {
        let db = setup().await;
        let invitations = SqliteInvitationRepository;
        let result = db
            .run(move |txn| {
                let invitations = invitations.clone();
                Box::pin(async move { invitations.accept_invitation(txn, "bogus".into()).await })
            })
            .await;
        assert!(matches!(result, Err(DomainError::NotFound)));
    }

    // ---- Existing integration-style tests ----

    #[tokio::test]
    async fn checked_state_is_set_not_toggled() {
        let db = setup().await;
        let list = create_list(&db, "List").await;
        let item = add_item(&db, list.id, "Coffee").await;
        let items = SqliteItemRepository;
        db.run(move |txn| {
            let items = items.clone();
            Box::pin(async move { items.set_item_checked(txn, list.id, item.id, true).await })
        })
        .await
        .unwrap();
        db.run(move |txn| {
            let items = items.clone();
            Box::pin(async move { items.set_item_checked(txn, list.id, item.id, true).await })
        })
        .await
        .unwrap();

        let item = get_items(&db, list.id).await.remove(0);
        assert!(item.checked);
        assert_eq!(item.version, 3);
    }

    #[tokio::test]
    async fn checking_an_item_does_not_change_list_order() {
        let db = setup().await;
        let list = create_list(&db, "List").await;
        add_item(&db, list.id, "First").await;
        add_item(&db, list.id, "Second").await;
        let items = SqliteItemRepository;
        let first_item = get_items(&db, list.id).await.remove(0);

        db.run(move |txn| {
            let items = items.clone();
            Box::pin(async move {
                items
                    .set_item_checked(txn, list.id, first_item.id, true)
                    .await
            })
        })
        .await
        .unwrap();

        let items = get_items(&db, list.id).await;
        assert_eq!(items[0].name, "First");
        assert!(items[0].checked);
        assert_eq!(items[1].name, "Second");
    }

    // ---- MealRepository / MealIngredientRepository ----

    async fn create_meal(db: &SqliteDatabase, name: &str) -> Meal {
        let meals = SqliteMealRepository;
        let name = name.to_owned();
        db.run(move |txn| {
            let meals = meals.clone();
            Box::pin(async move { meals.create_meal(txn, name, String::new(), None).await })
        })
        .await
        .unwrap()
    }

    async fn add_ingredient(
        db: &SqliteDatabase,
        meal_id: i64,
        name: &str,
        category_id: Option<i64>,
    ) -> MealIngredient {
        let ingredients = SqliteMealIngredientRepository;
        let name_for_insert = name.to_owned();
        db.run(move |txn| {
            let ingredients = ingredients.clone();
            Box::pin(async move {
                ingredients
                    .add_ingredient(
                        txn,
                        meal_id,
                        name_for_insert,
                        String::new(),
                        String::new(),
                        category_id,
                    )
                    .await
            })
        })
        .await
        .unwrap();
        let ingredients = SqliteMealIngredientRepository;
        db.run(move |txn| {
            let ingredients = ingredients.clone();
            Box::pin(async move { ingredients.ingredients_for_meal(txn, meal_id).await })
        })
        .await
        .unwrap()
        .into_iter()
        .find(|ingredient| ingredient.name == name)
        .unwrap()
    }

    #[tokio::test]
    async fn create_meal_returns_meal_with_id() {
        let db = setup().await;
        let meal = create_meal(&db, "Pasta").await;
        assert!(meal.id > 0);
        assert_eq!(meal.name, "Pasta");
        assert!(meal.ingredients.is_empty());
    }

    #[tokio::test]
    async fn list_meals_returns_all_meals() {
        let db = setup().await;
        create_meal(&db, "Pasta").await;
        create_meal(&db, "Salad").await;
        let meals = SqliteMealRepository;
        let meals = db
            .run(move |txn| {
                let meals = meals.clone();
                Box::pin(async move { meals.list_meals(txn).await })
            })
            .await
            .unwrap();
        let mut names = meals.iter().map(|m| m.name.clone()).collect::<Vec<_>>();
        names.sort_unstable();
        assert_eq!(names, vec!["Pasta".to_owned(), "Salad".to_owned()]);
    }

    #[tokio::test]
    async fn get_meal_returns_meal_with_ingredients() {
        let db = setup().await;
        let meal = create_meal(&db, "Pasta").await;
        add_ingredient(&db, meal.id, "Penne", None).await;
        add_ingredient(&db, meal.id, "Tomato", None).await;
        let meals = SqliteMealRepository;
        let fetched = db
            .run(move |txn| {
                let meals = meals.clone();
                Box::pin(async move { meals.get_meal(txn, meal.id).await })
            })
            .await
            .unwrap()
            .unwrap();
        assert_eq!(fetched.name, "Pasta");
        let mut names = fetched
            .ingredients
            .iter()
            .map(|i| i.name.clone())
            .collect::<Vec<_>>();
        names.sort_unstable();
        assert_eq!(names, vec!["Penne".to_owned(), "Tomato".to_owned()]);
    }

    #[tokio::test]
    async fn get_meal_returns_none_for_unknown() {
        let db = setup().await;
        let meals = SqliteMealRepository;
        let found = db
            .run(move |txn| {
                let meals = meals.clone();
                Box::pin(async move { meals.get_meal(txn, 9999).await })
            })
            .await
            .unwrap();
        assert!(found.is_none());
    }

    #[tokio::test]
    async fn update_meal_changes_fields() {
        let db = setup().await;
        let meal = create_meal(&db, "Pasta").await;
        let meals = SqliteMealRepository;
        db.run(move |txn| {
            let meals = meals.clone();
            Box::pin(async move {
                meals
                    .update_meal(
                        txn,
                        meal.id,
                        "Pasta al pomodoro".into(),
                        "desc".into(),
                        None,
                    )
                    .await
            })
        })
        .await
        .unwrap();
        let fetched = db
            .run(move |txn| {
                let meals = meals.clone();
                Box::pin(async move { meals.get_meal(txn, meal.id).await })
            })
            .await
            .unwrap()
            .unwrap();
        assert_eq!(fetched.name, "Pasta al pomodoro");
        assert_eq!(fetched.description, "desc");
    }

    #[tokio::test]
    async fn update_missing_meal_fails() {
        let db = setup().await;
        let meals = SqliteMealRepository;
        let result = db
            .run(move |txn| {
                let meals = meals.clone();
                Box::pin(async move {
                    meals
                        .update_meal(txn, 9999, "X".into(), String::new(), None)
                        .await
                })
            })
            .await;
        assert!(matches!(result, Err(DomainError::NotFound)));
    }

    #[tokio::test]
    async fn delete_meal_removes_it_and_ingredients() {
        let db = setup().await;
        let meal = create_meal(&db, "Pasta").await;
        add_ingredient(&db, meal.id, "Penne", None).await;
        let meals = SqliteMealRepository;
        db.run(move |txn| {
            let meals = meals.clone();
            Box::pin(async move { meals.delete_meal(txn, meal.id).await })
        })
        .await
        .unwrap();
        let found = db
            .run(move |txn| {
                let meals = meals.clone();
                Box::pin(async move { meals.get_meal(txn, meal.id).await })
            })
            .await
            .unwrap();
        assert!(found.is_none());
    }

    #[tokio::test]
    async fn delete_missing_meal_fails() {
        let db = setup().await;
        let meals = SqliteMealRepository;
        let result = db
            .run(move |txn| {
                let meals = meals.clone();
                Box::pin(async move { meals.delete_meal(txn, 9999).await })
            })
            .await;
        assert!(matches!(result, Err(DomainError::NotFound)));
    }

    #[tokio::test]
    async fn add_ingredient_with_unknown_category_fails() {
        let db = setup().await;
        let meal = create_meal(&db, "Pasta").await;
        let ingredients = SqliteMealIngredientRepository;
        let result = db
            .run(move |txn| {
                let ingredients = ingredients.clone();
                Box::pin(async move {
                    ingredients
                        .add_ingredient(
                            txn,
                            meal.id,
                            "X".into(),
                            String::new(),
                            String::new(),
                            Some(9999),
                        )
                        .await
                })
            })
            .await;
        assert!(matches!(result, Err(DomainError::NotFound)));
    }

    #[tokio::test]
    async fn update_ingredient_changes_fields() {
        let db = setup().await;
        let meal = create_meal(&db, "Pasta").await;
        let ingredient = add_ingredient(&db, meal.id, "Penne", None).await;
        let ingredients = SqliteMealIngredientRepository;
        db.run(move |txn| {
            let ingredients = ingredients.clone();
            Box::pin(async move {
                ingredients
                    .update_ingredient(
                        txn,
                        meal.id,
                        ingredient.id,
                        "Rigatoni".into(),
                        "500g".into(),
                        String::new(),
                        None,
                    )
                    .await
            })
        })
        .await
        .unwrap();
        let fetched = db
            .run(move |txn| {
                let ingredients = ingredients.clone();
                Box::pin(async move { ingredients.ingredients_for_meal(txn, meal.id).await })
            })
            .await
            .unwrap();
        assert_eq!(fetched[0].name, "Rigatoni");
        assert_eq!(fetched[0].quantity, "500g");
    }

    #[tokio::test]
    async fn delete_ingredient_removes_it() {
        let db = setup().await;
        let meal = create_meal(&db, "Pasta").await;
        let ingredient = add_ingredient(&db, meal.id, "Penne", None).await;
        let ingredients = SqliteMealIngredientRepository;
        db.run(move |txn| {
            let ingredients = ingredients.clone();
            Box::pin(async move {
                ingredients
                    .delete_ingredient(txn, meal.id, ingredient.id)
                    .await
            })
        })
        .await
        .unwrap();
        let remaining = db
            .run(move |txn| {
                let ingredients = ingredients.clone();
                Box::pin(async move { ingredients.ingredients_for_meal(txn, meal.id).await })
            })
            .await
            .unwrap();
        assert!(remaining.is_empty());
    }

    #[tokio::test]
    async fn delete_missing_ingredient_fails() {
        let db = setup().await;
        let meal = create_meal(&db, "Pasta").await;
        let ingredients = SqliteMealIngredientRepository;
        let result = db
            .run(move |txn| {
                let ingredients = ingredients.clone();
                Box::pin(async move { ingredients.delete_ingredient(txn, meal.id, 9999).await })
            })
            .await;
        assert!(matches!(result, Err(DomainError::NotFound)));
    }

    // ---- ListMealRepository ----

    async fn add_meal_to_list(db: &SqliteDatabase, list_id: i64, meal: &Meal) -> ListMeal {
        let list_meals = SqliteListMealRepository;
        let name = meal.name.clone();
        let meal_id = meal.id;
        let id = db
            .run(move |txn| {
                let list_meals = list_meals.clone();
                Box::pin(async move { list_meals.add_meal(txn, list_id, meal_id, name).await })
            })
            .await
            .unwrap();
        ListMeal {
            id,
            meal_id: Some(meal.id),
            name: meal.name.clone(),
            created_at: 0,
        }
    }

    #[tokio::test]
    async fn list_meals_returns_meals_added_to_a_list() {
        let db = setup().await;
        let list = create_list(&db, "Weekly shop").await;
        let meal = create_meal(&db, "Pasta").await;
        add_meal_to_list(&db, list.id, &meal).await;

        let list_meals = SqliteListMealRepository;
        let meals = db
            .run(move |txn| {
                let list_meals = list_meals.clone();
                Box::pin(async move { list_meals.list_meals(txn, list.id).await })
            })
            .await
            .unwrap();
        assert_eq!(meals.len(), 1);
        assert_eq!(meals[0].name, "Pasta");
        assert_eq!(meals[0].meal_id, Some(meal.id));
    }

    #[tokio::test]
    async fn removing_a_meal_deletes_its_items_and_bumps_revision() {
        let db = setup().await;
        let list = create_list(&db, "Weekly shop").await;
        let meal = create_meal(&db, "Pasta").await;
        add_ingredient(&db, meal.id, "Penne", None).await;
        add_ingredient(&db, meal.id, "Tomato", None).await;
        let list_meal = add_meal_to_list(&db, list.id, &meal).await;

        let items = SqliteItemRepository;
        let ingredients = SqliteMealIngredientRepository;
        let ingredient_rows = db
            .run(move |txn| {
                let ingredients = ingredients.clone();
                Box::pin(async move { ingredients.ingredients_for_meal(txn, meal.id).await })
            })
            .await
            .unwrap();
        let new_items = ingredient_rows
            .into_iter()
            .map(|ingredient| NewItem {
                name: ingredient.name,
                quantity: ingredient.quantity,
                note: ingredient.note,
                category_id: ingredient.category_id,
                list_meal_id: Some(list_meal.id),
            })
            .collect();
        db.run(move |txn| {
            let items = items.clone();
            Box::pin(async move { items.add_items_bulk(txn, list.id, new_items).await })
        })
        .await
        .unwrap();
        assert_eq!(get_items(&db, list.id).await.len(), 2);

        let list_meals = SqliteListMealRepository;
        let revision = db
            .run(move |txn| {
                let list_meals = list_meals.clone();
                Box::pin(async move { list_meals.remove_meal(txn, list.id, list_meal.id).await })
            })
            .await
            .unwrap();
        assert_eq!(revision, 2);

        let meals = db
            .run(move |txn| {
                let list_meals = list_meals.clone();
                Box::pin(async move { list_meals.list_meals(txn, list.id).await })
            })
            .await
            .unwrap();
        assert!(meals.is_empty());
        assert!(get_items(&db, list.id).await.is_empty());
    }

    #[tokio::test]
    async fn removing_an_unknown_meal_from_a_list_fails() {
        let db = setup().await;
        let list = create_list(&db, "Weekly shop").await;
        let list_meals = SqliteListMealRepository;
        let result = db
            .run(move |txn| {
                let list_meals = list_meals.clone();
                Box::pin(async move { list_meals.remove_meal(txn, list.id, 9999).await })
            })
            .await;
        assert!(matches!(result, Err(DomainError::NotFound)));
    }

    // ---- PasskeyRepository ----

    #[tokio::test]
    async fn passkey_crud_roundtrip() {
        let db = setup().await;
        let user = create_user(&db, "alice@example.com").await;
        let passkeys = SqlitePasskeyRepository;

        let created = db
            .run(move |txn| {
                let passkeys = passkeys.clone();
                Box::pin(async move {
                    passkeys
                        .create_passkey(txn, user.id, "cred-1".into(), "{}".into(), 0)
                        .await
                })
            })
            .await
            .unwrap();
        assert!(created.id > 0);
        assert_eq!(created.user_id, user.id);
        assert_eq!(created.credential_id, "cred-1");

        let found = db
            .run(move |txn| {
                let passkeys = passkeys.clone();
                Box::pin(async move { passkeys.find_by_credential_id(txn, "cred-1".into()).await })
            })
            .await
            .unwrap()
            .unwrap();
        assert_eq!(found.id, created.id);

        let listed = db
            .run(move |txn| {
                let passkeys = passkeys.clone();
                Box::pin(async move { passkeys.list_for_user(txn, user.id).await })
            })
            .await
            .unwrap();
        assert_eq!(listed.len(), 1);

        db.run(move |txn| {
            let passkeys = passkeys.clone();
            Box::pin(async move { passkeys.delete_passkey(txn, user.id, created.id).await })
        })
        .await
        .unwrap();

        let after = db
            .run(move |txn| {
                let passkeys = passkeys.clone();
                Box::pin(async move { passkeys.list_for_user(txn, user.id).await })
            })
            .await
            .unwrap();
        assert!(after.is_empty());
    }

    #[tokio::test]
    async fn duplicate_passkey_credential_id_conflicts() {
        let db = setup().await;
        let user = create_user(&db, "alice@example.com").await;
        let passkeys = SqlitePasskeyRepository;
        db.run(move |txn| {
            let passkeys = passkeys.clone();
            Box::pin(async move {
                passkeys
                    .create_passkey(txn, user.id, "cred-1".into(), "{}".into(), 0)
                    .await
            })
        })
        .await
        .unwrap();

        let result = db
            .run(move |txn| {
                let passkeys = passkeys.clone();
                Box::pin(async move {
                    passkeys
                        .create_passkey(txn, user.id, "cred-1".into(), "{}".into(), 0)
                        .await
                })
            })
            .await;
        assert!(matches!(result, Err(DomainError::Conflict)));
    }

    #[tokio::test]
    async fn delete_missing_passkey_fails() {
        let db = setup().await;
        let user = create_user(&db, "alice@example.com").await;
        let passkeys = SqlitePasskeyRepository;
        let result = db
            .run(move |txn| {
                let passkeys = passkeys.clone();
                Box::pin(async move { passkeys.delete_passkey(txn, user.id, 9999).await })
            })
            .await;
        assert!(matches!(result, Err(DomainError::NotFound)));
    }
}