//! Tauri commands for database/storage operations
//!
//! TRACES: UR-002, UR-011, UR-012, UR-017, UR-019, UR-025, UR-047 | IR-013 | DR-012, DR-013, DR-022, DR-060

use std::sync::{Arc, Mutex};

use log::{debug, error, info, warn};
use serde::{Deserialize, Serialize};
use tauri::State;

use crate::credentials::CredentialStore;
use crate::storage::db_service::{DatabaseService, Query, QueryParam};
use crate::storage::Database;
use crate::thumbnail::ThumbnailCache;

use super::SmartCacheWrapper;

// Cohesive command clusters in their own submodules, re-exported so the command
// names remain at `commands::storage::*` (invoke_handler unchanged).
mod people;
mod series_prefs;
mod thumbnails;
pub use people::*;
pub use series_prefs::*;
pub use thumbnails::*;

/// Wrapper for thread-safe database access
pub struct DatabaseWrapper(pub Mutex<Database>);

/// Wrapper for thread-safe credential store access
pub struct CredentialStoreWrapper(pub Mutex<CredentialStore>);

/// Wrapper for thread-safe thumbnail cache access
pub struct ThumbnailCacheWrapper(pub Arc<ThumbnailCache>);

/// Server info returned to frontend
#[derive(specta::Type, Debug, Clone, Serialize, Deserialize)]
pub struct ServerInfo {
    pub id: String,
    pub name: String,
    pub url: String,
    pub version: Option<String>,
}

/// User info returned to frontend
#[derive(specta::Type, Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct UserInfo {
    pub id: String,
    pub server_id: String,
    pub username: String,
    pub is_active: bool,
}

/// Active session info (for session restoration)
#[derive(specta::Type, Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct ActiveSession {
    pub user_id: String,
    pub username: String,
    pub server_id: String,
    pub server_url: String,
    pub server_name: String,
    pub access_token: String,
}

/// Security status info
#[derive(specta::Type, Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct SecurityStatus {
    pub using_keyring: bool,
    pub storage_type: String,
}

/// Initialize the database and run migrations
#[tauri::command]
#[specta::specta]
pub fn storage_init(db: State<DatabaseWrapper>) -> Result<String, String> {
    let database = db.0.lock().map_err(|e| e.to_string())?;
    Ok(database.path().to_string_lossy().to_string())
}

/// A playable URL for a downloaded file on disk.
///
/// Local media is served over a loopback HTTP server rather than handed to the
/// webview as a `file://`/asset URL, because the asset protocol cannot stream a
/// large file — it answers a range-less request with the whole thing, which
/// Chromium abandons. See `media_server` for why real HTTP is used.
///
/// The returned URL carries the server's per-session token, so it is only valid
/// for this run of the app and must not be persisted.
///
/// TRACES: UR-071 | DR-137
#[tauri::command]
#[specta::specta]
pub fn media_local_url(
    server: State<crate::media_server::MediaServerWrapper>,
    path: String,
) -> Result<String, String> {
    server
        .0
        .as_ref()
        .map(|s| s.url_for(&path))
        .ok_or_else(|| "Local media server is not running".to_string())
}

/// The stream selection for a downloaded file.
///
/// The local-playback counterpart to `repository_get_stream_selection`. A file
/// on disk needs no negotiation — it is a direct play over a local transport,
/// with no quality ladder, because nothing about it can be re-negotiated — but
/// the *frontend must not be the one to say so*. It gets the same
/// [`StreamSelection`] shape as a streamed source so the player has one contract
/// to consume rather than two, and so no caller has to infer a transport from a
/// loopback URL.
///
/// TRACES: UR-071, UR-079 | DR-225
#[tauri::command]
#[specta::specta]
pub fn media_local_selection(
    server: State<crate::media_server::MediaServerWrapper>,
    path: String,
) -> Result<crate::repository::StreamSelection, String> {
    server
        .0
        .as_ref()
        .map(|s| crate::repository::StreamSelection::local_file(s.url_for(&path)))
        .ok_or_else(|| "Local media server is not running".to_string())
}

/// Get storage directory path (parent directory of the database file)
#[tauri::command]
#[specta::specta]
pub fn storage_get_path(db: State<DatabaseWrapper>) -> Result<String, String> {
    let database = db.0.lock().map_err(|e| e.to_string())?;
    let db_path = database.path();

    // Return the parent directory instead of the database file path
    let storage_dir = db_path
        .parent()
        .ok_or_else(|| "Database path has no parent directory".to_string())?;

    Ok(storage_dir.to_string_lossy().to_string())
}

/// Get database file size in bytes
#[tauri::command]
#[specta::specta]
pub fn storage_get_size(db: State<DatabaseWrapper>) -> Result<Option<u64>, String> {
    let database = db.0.lock().map_err(|e| e.to_string())?;
    Ok(database.file_size())
}

/// Get security status (keyring vs encrypted file fallback)
#[tauri::command]
#[specta::specta]
pub fn storage_get_security_status(
    creds: State<CredentialStoreWrapper>,
) -> Result<SecurityStatus, String> {
    let store = creds.0.lock().map_err(|e| e.to_string())?;
    let using_keyring = store.is_using_keyring();
    Ok(SecurityStatus {
        using_keyring,
        storage_type: if using_keyring {
            "system_keyring".to_string()
        } else {
            "encrypted_file".to_string()
        },
    })
}

/// Save a server connection
/// Uses INSERT ... ON CONFLICT to avoid triggering CASCADE DELETE on users
#[tauri::command]
#[specta::specta]
pub async fn storage_save_server(
    db: State<'_, DatabaseWrapper>,
    id: String,
    name: String,
    url: String,
    version: Option<String>,
) -> Result<(), String> {
    let db_service = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        Arc::new(database.service())
    };

    // IMPORTANT: Use ON CONFLICT ... DO UPDATE instead of INSERT OR REPLACE
    // INSERT OR REPLACE triggers DELETE + INSERT, which cascades to delete all users!
    let query = Query::with_params(
        "INSERT INTO servers (id, name, url, version, last_connected_at)
         VALUES (?, ?, ?, ?, CURRENT_TIMESTAMP)
         ON CONFLICT(id) DO UPDATE SET
            name = excluded.name,
            url = excluded.url,
            version = excluded.version,
            last_connected_at = CURRENT_TIMESTAMP",
        vec![
            QueryParam::String(id),
            QueryParam::String(name),
            QueryParam::String(url),
            version.map(QueryParam::String).unwrap_or(QueryParam::Null),
        ],
    );

    db_service.execute(query).await.map_err(|e| e.to_string())?;

    Ok(())
}

/// Get all saved servers
#[tauri::command]
#[specta::specta]
pub async fn storage_get_servers(
    db: State<'_, DatabaseWrapper>,
) -> Result<Vec<ServerInfo>, String> {
    let db_service = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        Arc::new(database.service())
    };

    let query =
        Query::new("SELECT id, name, url, version FROM servers ORDER BY last_connected_at DESC");

    let servers = db_service
        .query_many(query, |row| {
            Ok(ServerInfo {
                id: row.get(0)?,
                name: row.get(1)?,
                url: row.get(2)?,
                version: row.get(3)?,
            })
        })
        .await
        .map_err(|e| e.to_string())?;

    Ok(servers)
}

/// Delete a server and all associated data
#[tauri::command]
#[specta::specta]
pub async fn storage_delete_server(
    db: State<'_, DatabaseWrapper>,
    creds: State<'_, CredentialStoreWrapper>,
    server_id: String,
) -> Result<(), String> {
    let db_service = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        Arc::new(database.service())
    };

    // Get all user IDs for this server to delete their tokens
    let user_query = Query::with_params(
        "SELECT id FROM users WHERE server_id = ?",
        vec![QueryParam::String(server_id.clone())],
    );

    let user_ids: Vec<String> = db_service
        .query_many(user_query, |row| row.get(0))
        .await
        .map_err(|e| e.to_string())?;

    // Delete tokens from secure storage
    {
        let store = creds.0.lock().map_err(|e| e.to_string())?;
        for user_id in user_ids {
            let _ = store.delete_token(&user_id); // Ignore errors, user might not have token
        }
    } // Drop store lock here

    // Delete server (cascades to users via foreign key)
    let delete_query = Query::with_params(
        "DELETE FROM servers WHERE id = ?",
        vec![QueryParam::String(server_id)],
    );

    db_service
        .execute(delete_query)
        .await
        .map_err(|e| e.to_string())?;

    Ok(())
}

/// Save a user account (token stored in secure storage, not database)
#[tauri::command]
#[specta::specta]
pub async fn storage_save_user(
    db: State<'_, DatabaseWrapper>,
    creds: State<'_, CredentialStoreWrapper>,
    id: String,
    server_id: String,
    username: String,
    access_token: Option<String>,
) -> Result<bool, String> {
    info!(
        "storage_save_user called: id={}, server_id={}, username={}",
        id, server_id, username
    );

    let (db_service, db_path) = {
        let database = db.0.lock().map_err(|e| {
            error!("Failed to lock database: {}", e);
            e.to_string()
        })?;
        let path = database.path().to_path_buf();
        (Arc::new(database.service()), path)
    };

    // Save user metadata to database (without token)
    // IMPORTANT: Use ON CONFLICT ... DO UPDATE instead of INSERT OR REPLACE
    // INSERT OR REPLACE triggers DELETE + INSERT, which cascades to delete user_data!
    debug!("Executing INSERT INTO users with ON CONFLICT...");
    let insert_query = Query::with_params(
        "INSERT INTO users (id, server_id, username, last_login_at)
         VALUES (?, ?, ?, CURRENT_TIMESTAMP)
         ON CONFLICT(id) DO UPDATE SET
            server_id = excluded.server_id,
            username = excluded.username,
            last_login_at = CURRENT_TIMESTAMP",
        vec![
            QueryParam::String(id.clone()),
            QueryParam::String(server_id),
            QueryParam::String(username),
        ],
    );

    db_service.execute(insert_query).await.map_err(|e| {
        error!("Failed to save user: {}", e);
        e.to_string()
    })?;
    info!("User saved to database successfully");

    // Verify the user was actually saved
    let verify_query = Query::with_params(
        "SELECT COUNT(*) FROM users WHERE id = ?",
        vec![QueryParam::String(id.clone())],
    );
    let verify_count: i32 = db_service
        .query_one(verify_query, |row| row.get(0))
        .await
        .unwrap_or(-1);
    debug!("VERIFY: {} users with id={} after insert", verify_count, id);
    debug!("Database path: {:?}", db_path);

    // Force WAL checkpoint to ensure user data is persisted to disk
    let checkpoint_query = Query::new("PRAGMA wal_checkpoint(PASSIVE)");
    match db_service.execute(checkpoint_query).await {
        Ok(_) => debug!("WAL checkpoint completed after save_user"),
        Err(e) => warn!("WAL checkpoint failed: {}", e),
    }

    // Save token to secure storage if provided
    let using_keyring = if let Some(token) = access_token {
        let store = creds.0.lock().map_err(|e| e.to_string())?;
        let result = store.save_token(&id, &token).map_err(|e| e.to_string())?;
        let is_keyring = matches!(result, crate::credentials::CredentialResult::Keyring);
        is_keyring
    } else {
        // No token provided, check current status
        let store = creds.0.lock().map_err(|e| e.to_string())?;
        store.is_using_keyring()
    };

    // Return whether we're using the secure keyring
    Ok(using_keyring)
}

/// Get users for a server
#[tauri::command]
#[specta::specta]
pub async fn storage_get_users(
    db: State<'_, DatabaseWrapper>,
    server_id: String,
) -> Result<Vec<UserInfo>, String> {
    let db_service = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        Arc::new(database.service())
    };

    let query = Query::with_params(
        "SELECT id, server_id, username, is_active FROM users
         WHERE server_id = ? ORDER BY last_login_at DESC",
        vec![QueryParam::String(server_id)],
    );

    let users = db_service
        .query_many(query, |row| {
            Ok(UserInfo {
                id: row.get(0)?,
                server_id: row.get(1)?,
                username: row.get(2)?,
                is_active: row.get::<_, i32>(3)? != 0,
            })
        })
        .await
        .map_err(|e| e.to_string())?;

    Ok(users)
}

/// Set a user as active (and deactivate all other users globally)
#[tauri::command]
#[specta::specta]
pub async fn storage_set_active_user(
    db: State<'_, DatabaseWrapper>,
    user_id: String,
    _server_id: String,
) -> Result<(), String> {
    info!("storage_set_active_user called: user_id={}", user_id);

    let (db_service, db_path) = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        let path = database.path().to_path_buf();
        (Arc::new(database.service()), path)
    };

    // Deactivate ALL users globally (since we only connect to one server at a time)
    let deactivate_query = Query::new("UPDATE users SET is_active = 0");
    db_service
        .execute(deactivate_query)
        .await
        .map_err(|e| e.to_string())?;

    // Activate the specified user and update last_login_at
    let activate_query = Query::with_params(
        "UPDATE users SET is_active = 1, last_login_at = CURRENT_TIMESTAMP WHERE id = ?",
        vec![QueryParam::String(user_id.clone())],
    );
    let rows_affected = db_service
        .execute(activate_query)
        .await
        .map_err(|e| e.to_string())?;

    debug!("storage_set_active_user: {} rows affected", rows_affected);

    if rows_affected == 0 {
        warn!("No user found with id={} to set as active!", user_id);
    }

    // Verify the user is now active
    let verify_query = Query::new("SELECT COUNT(*) FROM users WHERE is_active = 1");
    let verify_count: i32 = db_service
        .query_one(verify_query, |row| row.get(0))
        .await
        .unwrap_or(-1);
    debug!("VERIFY: {} active users after set_active", verify_count);
    debug!("Database path: {:?}", db_path);

    // Force WAL checkpoint to ensure data is persisted to disk
    let checkpoint_query = Query::new("PRAGMA wal_checkpoint(PASSIVE)");
    match db_service.execute(checkpoint_query).await {
        Ok(_) => debug!("WAL checkpoint completed"),
        Err(e) => warn!("WAL checkpoint failed: {}", e),
    }

    Ok(())
}

/// Get the active user for a server
#[tauri::command]
#[specta::specta]
pub async fn storage_get_active_user(
    db: State<'_, DatabaseWrapper>,
    server_id: String,
) -> Result<Option<UserInfo>, String> {
    let db_service = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        Arc::new(database.service())
    };

    let query = Query::with_params(
        "SELECT id, server_id, username, is_active FROM users
         WHERE server_id = ? AND is_active = 1",
        vec![QueryParam::String(server_id)],
    );

    db_service
        .query_optional(query, |row| {
            Ok(UserInfo {
                id: row.get(0)?,
                server_id: row.get(1)?,
                username: row.get(2)?,
                is_active: true,
            })
        })
        .await
        .map_err(|e| e.to_string())
}

/// Get the active session (user + server + token) for session restoration
#[tauri::command]
#[specta::specta]
pub async fn storage_get_active_session(
    db: State<'_, DatabaseWrapper>,
    creds: State<'_, CredentialStoreWrapper>,
) -> Result<Option<ActiveSession>, String> {
    info!("storage_get_active_session called");

    let (db_service, db_path) = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        let path = database.path().to_path_buf();
        (Arc::new(database.service()), path)
    };

    // Debug: count total users and active users
    let total_query = Query::new("SELECT COUNT(*) FROM users");
    let total_users: i32 = db_service
        .query_one(total_query, |row| row.get(0))
        .await
        .unwrap_or(-1);

    let active_query = Query::new("SELECT COUNT(*) FROM users WHERE is_active = 1");
    let active_users: i32 = db_service
        .query_one(active_query, |row| row.get(0))
        .await
        .unwrap_or(-1);

    debug!(
        "Database state: {} total users, {} active users",
        total_users, active_users
    );
    debug!("Database path: {:?}", db_path);

    // Find active user with their server info, ordered by most recently logged in
    let session_query = Query::new(
        "SELECT u.id, u.username, u.server_id, s.url, s.name
         FROM users u
         JOIN servers s ON u.server_id = s.id
         WHERE u.is_active = 1
         ORDER BY u.last_login_at DESC
         LIMIT 1",
    );

    let result = db_service
        .query_optional(session_query, |row| {
            Ok((
                row.get::<_, String>(0)?,
                row.get::<_, String>(1)?,
                row.get::<_, String>(2)?,
                row.get::<_, String>(3)?,
                row.get::<_, String>(4)?,
            ))
        })
        .await
        .map_err(|e| e.to_string())?;

    match result {
        Some((user_id, username, server_id, server_url, server_name)) => {
            info!("Found active user: {} ({})", username, user_id);
            // Get token from secure storage
            let store = creds.0.lock().map_err(|e| e.to_string())?;
            match store.get_token(&user_id) {
                Ok(access_token) => {
                    debug!("Successfully retrieved token from secure storage");
                    Ok(Some(ActiveSession {
                        user_id,
                        username,
                        server_id,
                        server_url,
                        server_name,
                        access_token,
                    }))
                }
                Err(e) => {
                    // Token not found or error - session is invalid
                    warn!("Failed to get token from secure storage: {:?}", e);
                    Ok(None)
                }
            }
        }
        None => {
            info!("No active user found in database");
            Ok(None)
        }
    }
}

/// Get user's access token from secure storage
#[tauri::command]
#[specta::specta]
pub fn storage_get_access_token(
    creds: State<CredentialStoreWrapper>,
    user_id: String,
) -> Result<Option<String>, String> {
    let store = creds.0.lock().map_err(|e| e.to_string())?;
    match store.get_token(&user_id) {
        Ok(token) => Ok(Some(token)),
        Err(crate::credentials::CredentialError::NotFound) => Ok(None),
        Err(e) => Err(e.to_string()),
    }
}

/// Delete a user account and their token from secure storage
#[tauri::command]
#[specta::specta]
pub async fn storage_delete_user(
    db: State<'_, DatabaseWrapper>,
    creds: State<'_, CredentialStoreWrapper>,
    user_id: String,
) -> Result<(), String> {
    info!("storage_delete_user called: user_id={}", user_id);
    debug!("STACK TRACE: This is where the user is being deleted!");

    // Delete token from secure storage first
    {
        let store = creds.0.lock().map_err(|e| e.to_string())?;
        let _ = store.delete_token(&user_id); // Ignore errors, token might not exist
    }

    // Delete user from database
    let db_service = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        Arc::new(database.service())
    };

    let query = Query::with_params(
        "DELETE FROM users WHERE id = ?",
        vec![QueryParam::String(user_id)],
    );

    db_service.execute(query).await.map_err(|e| e.to_string())?;

    info!("User deleted successfully");
    Ok(())
}

/// Playback progress info
#[derive(specta::Type, Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct PlaybackProgress {
    pub item_id: String,
    /// Resume position in milliseconds. Stored as Jellyfin ticks in the DB;
    /// converted here so the frontend never sees ticks.
    pub position_ms: i64,
    pub is_played: bool,
    pub is_favorite: bool,
    pub play_count: i32,
}

/// Update playback progress in local database
/// This stores the progress locally for offline access and "continue watching"
#[tauri::command]
#[specta::specta]
pub async fn storage_update_playback_progress(
    db: State<'_, DatabaseWrapper>,
    user_id: String,
    item_id: String,
    position_ms: i64,
) -> Result<(), String> {
    // The frontend speaks milliseconds; ticks are a Jellyfin storage detail that
    // stays on this side of the boundary. 10_000 ticks = 1 ms.
    let position_ticks = position_ms * 10_000;
    let db_service = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        Arc::new(database.service())
    };

    // Note: user_id and item_id are Jellyfin IDs (strings)
    // The user_data table uses them directly as strings, not foreign keys to integer IDs
    // Insert or update playback position
    let query = Query::with_params(
        "INSERT INTO user_data (user_id, item_id, playback_position_ticks, last_played_at, pending_sync)
         VALUES (?, ?, ?, CURRENT_TIMESTAMP, 1)
         ON CONFLICT(user_id, item_id) DO UPDATE SET
            playback_position_ticks = excluded.playback_position_ticks,
            last_played_at = excluded.last_played_at,
            pending_sync = 1",
        vec![
            QueryParam::String(user_id),
            QueryParam::String(item_id.clone()),
            QueryParam::Int64(position_ticks),
        ],
    );

    match db_service.execute(query).await {
        Ok(_) => Ok(()),
        Err(e) if e.contains("constraint") || e.contains("UNIQUE") => {
            // Foreign key constraint failed - this can happen if:
            // 1. The item isn't synced locally yet (item_id not in items table)
            // 2. Database migration 003 hasn't been applied (old database)
            //
            // In either case, we silently succeed - playback progress will still
            // be reported to the server, and local progress will be tracked
            // once the item is synced.
            debug!(
                "Skipping local playback progress for item {} (not cached locally)",
                item_id
            );
            Ok(())
        }
        Err(e) => Err(format!("Failed to update playback progress: {}", e)),
    }
}

/// Update playback progress with context in local database
/// This stores the progress along with playback context (container vs single)
#[tauri::command]
#[specta::specta]
pub async fn storage_update_playback_context(
    db: State<'_, DatabaseWrapper>,
    user_id: String,
    item_id: String,
    position_ms: i64,
    context_type: Option<String>,
    context_id: Option<String>,
) -> Result<(), String> {
    use crate::storage::db_service::{Query, QueryParam};

    // Milliseconds in, Jellyfin ticks stored. 10_000 ticks = 1 ms.
    let position_ticks = position_ms * 10_000;
    let db_service = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        Arc::new(database.service())
    };

    let query = Query::with_params(
        "INSERT INTO user_data (user_id, item_id, playback_position_ticks, last_played_at,
                                playback_context_type, playback_context_id, pending_sync)
         VALUES (?, ?, ?, CURRENT_TIMESTAMP, ?, ?, 1)
         ON CONFLICT(user_id, item_id) DO UPDATE SET
            playback_position_ticks = excluded.playback_position_ticks,
            last_played_at = excluded.last_played_at,
            playback_context_type = excluded.playback_context_type,
            playback_context_id = excluded.playback_context_id,
            pending_sync = 1",
        vec![
            QueryParam::String(user_id.clone()),
            QueryParam::String(item_id.clone()),
            QueryParam::Int64(position_ticks),
            context_type
                .map(QueryParam::String)
                .unwrap_or(QueryParam::Null),
            context_id
                .map(QueryParam::String)
                .unwrap_or(QueryParam::Null),
        ],
    );

    match db_service.execute(query).await {
        Ok(_) => Ok(()),
        Err(e) if e.contains("constraint") || e.contains("UNIQUE") => {
            debug!(
                "Skipping local playback context for item {} (not cached locally)",
                item_id
            );
            Ok(())
        }
        Err(e) => Err(format!("Failed to update playback context: {}", e)),
    }
}

/// Mark item as played in local database
#[tauri::command]
#[specta::specta]
pub async fn storage_mark_played(
    db: State<'_, DatabaseWrapper>,
    smart_cache: State<'_, SmartCacheWrapper>,
    user_id: String,
    item_id: String,
) -> Result<(), String> {
    let db_service = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        Arc::new(database.service())
    };

    // Get album_id for this item (if it's an audio track)
    let album_query = Query::with_params(
        "SELECT album_id, item_type FROM items WHERE id = ?",
        vec![QueryParam::String(item_id.clone())],
    );

    let album_info: Option<(Option<String>, String)> = db_service
        .query_optional(album_query, |row| Ok((row.get(0)?, row.get(1)?)))
        .await
        .unwrap_or(None);

    // Track play in SmartCache (for audio tracks with albums)
    if let Some((Some(album_id), item_type)) = album_info.clone() {
        if item_type == "Audio" {
            // Clone cache to avoid holding lock across async operations
            let should_cache = {
                let cache = smart_cache.0.lock().map_err(|e| e.to_string())?;
                cache.track_play(&item_id, Some(&album_id));
                cache.should_cache_album(&album_id)
            };

            // Check if we should cache this album
            if let Some(true) = should_cache {
                info!("Album affinity threshold reached for album {}!", album_id);

                // Auto-queue remaining album tracks for download
                // Get tracks from this album that aren't already downloaded
                let tracks_query = Query::with_params(
                    "SELECT i.id, i.name, i.artists, i.album_name
                     FROM items i
                     LEFT JOIN downloads d ON d.item_id = i.id AND d.user_id = ?
                     WHERE i.album_id = ? AND i.item_type = 'Audio'
                       AND (d.id IS NULL OR d.status NOT IN ('completed', 'downloading', 'pending'))
                     ORDER BY i.index_number",
                    vec![
                        QueryParam::String(user_id.clone()),
                        QueryParam::String(album_id.clone()),
                    ],
                );

                let tracks: Vec<(String, String, Option<String>, Option<String>)> = db_service
                    .query_many(tracks_query, |row| {
                        Ok((row.get(0)?, row.get(1)?, row.get(2)?, row.get(3)?))
                    })
                    .await
                    .unwrap_or_else(|e| {
                        warn!("Failed to query album tracks: {}", e);
                        Vec::new()
                    });

                if !tracks.is_empty() {
                    info!(
                        "Auto-queueing {} tracks from album for download",
                        tracks.len()
                    );

                    // Queue each track with high priority (50) and mark as auto-downloaded
                    for (track_id, track_name, artist_name, album_name) in tracks {
                        // Generate a sanitized file path (simplified version)
                        let sanitized_name = track_name
                            .chars()
                            .map(|c| {
                                if c.is_alphanumeric() || c == ' ' || c == '-' || c == '_' {
                                    c
                                } else {
                                    '_'
                                }
                            })
                            .collect::<String>();
                        let file_path = format!("downloads/{}/{}.mp3", album_id, sanitized_name);

                        let insert_query = Query::with_params(
                            "INSERT INTO downloads (item_id, user_id, file_path, status, priority, queued_at, item_name, artist_name, album_name, download_source)
                             VALUES (?, ?, ?, 'pending', 50, CURRENT_TIMESTAMP, ?, ?, ?, 'auto')
                             ON CONFLICT(item_id, user_id) DO UPDATE SET
                               priority = 50,
                               status = 'pending',
                               download_source = 'auto'",
                            vec![
                                QueryParam::String(track_id.clone()),
                                QueryParam::String(user_id.clone()),
                                QueryParam::String(file_path),
                                QueryParam::String(track_name),
                                artist_name.map(QueryParam::String).unwrap_or(QueryParam::Null),
                                album_name.map(QueryParam::String).unwrap_or(QueryParam::Null),
                            ],
                        );

                        if let Err(e) = db_service.execute(insert_query).await {
                            warn!("Failed to queue track {}: {}", track_id, e);
                        }
                    }

                    info!("Album tracks queued for automatic download");
                } else {
                    info!("All album tracks already downloaded or queued");
                }
            }
        }
    }

    let query = Query::with_params(
        "INSERT INTO user_data (user_id, item_id, is_played, play_count, last_played_at, pending_sync)
         VALUES (?, ?, 1, 1, CURRENT_TIMESTAMP, 1)
         ON CONFLICT(user_id, item_id) DO UPDATE SET
            is_played = 1,
            play_count = play_count + 1,
            last_played_at = CURRENT_TIMESTAMP,
            pending_sync = 1",
        vec![QueryParam::String(user_id), QueryParam::String(item_id.clone())],
    );

    match db_service.execute(query).await {
        Ok(_) => Ok(()),
        Err(e) if e.contains("constraint") => {
            // Foreign key constraint failed - item not cached locally
            debug!(
                "Skipping local mark_played for item {} (not cached locally)",
                item_id
            );
            Ok(())
        }
        Err(e) => Err(e.to_string()),
    }
}

/// Set the watched flag locally for an item **and everything inside it**.
///
/// This backs the watched toggle, and is deliberately separate from
/// [`storage_mark_played`] — which reports a single track/episode finishing and
/// increments `play_count` — because the toggle has two directions and applies
/// to containers.
///
/// The recursion is what makes the toggle honest offline. Jellyfin applies
/// `POST`/`DELETE /PlayedItems/{id}` recursively over a season or series, so
/// online the server fixes up the children on the next read; with no server to
/// ask, marking a season watched would otherwise tick the season and leave every
/// episode inside it unwatched. Targets are drawn from `items` by the same link
/// columns the rest of the offline layer uses, so an id that is not cached
/// selects nothing and the statement is a no-op rather than a foreign-key error.
///
/// Un-marking clears the resume position too, matching the server, so an item
/// un-marked offline does not come back offering to resume from a position it is
/// no longer meant to have.
///
/// `pending_sync = 1` hands the rows to the sync drain.
///
/// TRACES: UR-073 | DR-158
#[tauri::command]
#[specta::specta]
pub async fn storage_set_watched(
    db: State<'_, DatabaseWrapper>,
    user_id: String,
    item_id: String,
    watched: bool,
) -> Result<(), String> {
    let db_service = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        Arc::new(database.service())
    };

    // The item itself plus its descendants: a season's episodes reach it by
    // season_id, a series' by series_id, its seasons by parent_id, an album's
    // tracks by album_id.
    let targets = "SELECT id FROM items
                   WHERE id = ? OR parent_id = ? OR album_id = ?
                      OR season_id = ? OR series_id = ?";

    let sql = if watched {
        format!(
            "INSERT INTO user_data (user_id, item_id, is_played, play_count, last_played_at, pending_sync)
             SELECT ?, id, 1, 1, CURRENT_TIMESTAMP, 1 FROM ({targets})
             ON CONFLICT(user_id, item_id) DO UPDATE SET
                is_played = 1,
                play_count = MAX(user_data.play_count, 1),
                last_played_at = CURRENT_TIMESTAMP,
                pending_sync = 1"
        )
    } else {
        format!(
            "INSERT INTO user_data (user_id, item_id, is_played, play_count, playback_position_ticks, pending_sync)
             SELECT ?, id, 0, 0, 0, 1 FROM ({targets})
             ON CONFLICT(user_id, item_id) DO UPDATE SET
                is_played = 0,
                play_count = 0,
                playback_position_ticks = 0,
                pending_sync = 1"
        )
    };

    let query = Query::with_params(
        sql,
        vec![
            QueryParam::String(user_id),
            QueryParam::String(item_id.clone()),
            QueryParam::String(item_id.clone()),
            QueryParam::String(item_id.clone()),
            QueryParam::String(item_id.clone()),
            QueryParam::String(item_id.clone()),
        ],
    );

    db_service.execute(query).await.map_err(|e| e.to_string())?;
    Ok(())
}

/// Get playback progress for an item
#[tauri::command]
#[specta::specta]
pub async fn storage_get_playback_progress(
    db: State<'_, DatabaseWrapper>,
    user_id: String,
    item_id: String,
) -> Result<Option<PlaybackProgress>, String> {
    let db_service = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        Arc::new(database.service())
    };

    let query = Query::with_params(
        "SELECT item_id, playback_position_ticks, is_played, is_favorite, play_count
         FROM user_data WHERE user_id = ? AND item_id = ?",
        vec![QueryParam::String(user_id), QueryParam::String(item_id)],
    );

    db_service
        .query_optional(query, |row| {
            let position_ticks: i64 = row.get(1)?;
            Ok(PlaybackProgress {
                item_id: row.get(0)?,
                position_ms: position_ticks / 10_000,
                is_played: row.get::<_, i32>(2)? != 0,
                is_favorite: row.get::<_, i32>(3)? != 0,
                play_count: row.get(4)?,
            })
        })
        .await
        .map_err(|e| e.to_string())
}

/// Mark pending sync as completed for an item
#[tauri::command]
#[specta::specta]
pub async fn storage_mark_synced(
    db: State<'_, DatabaseWrapper>,
    user_id: String,
    item_id: String,
) -> Result<(), String> {
    let db_service = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        Arc::new(database.service())
    };

    let query = Query::with_params(
        "UPDATE user_data SET pending_sync = 0, synced_at = CURRENT_TIMESTAMP
         WHERE user_id = ? AND item_id = ?",
        vec![QueryParam::String(user_id), QueryParam::String(item_id)],
    );

    db_service.execute(query).await.map_err(|e| e.to_string())?;

    Ok(())
}

/// Toggle favorite status for an item in local database
/// This updates the is_favorite field and marks it for sync to Jellyfin
#[tauri::command]
#[specta::specta]
pub async fn storage_toggle_favorite(
    db: State<'_, DatabaseWrapper>,
    user_id: String,
    item_id: String,
    is_favorite: bool,
) -> Result<bool, String> {
    let db_service = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        Arc::new(database.service())
    };

    // Insert or update favorite status
    let query = Query::with_params(
        "INSERT INTO user_data (user_id, item_id, is_favorite, pending_sync)
         VALUES (?, ?, ?, 1)
         ON CONFLICT(user_id, item_id) DO UPDATE SET
            is_favorite = excluded.is_favorite,
            pending_sync = 1",
        vec![
            QueryParam::String(user_id),
            QueryParam::String(item_id.clone()),
            QueryParam::Int(is_favorite as i32),
        ],
    );

    match db_service.execute(query).await {
        Ok(_) => Ok(is_favorite),
        Err(e) if e.contains("constraint") => {
            // Foreign key constraint failed - item not cached locally
            // Still return the requested state, server update will work separately
            debug!(
                "Skipping local favorite toggle for item {} (not cached locally)",
                item_id
            );
            Ok(is_favorite)
        }
        Err(e) => Err(format!("Failed to toggle favorite: {}", e)),
    }
}

// =============================================================================
// Offline Data Queries
// =============================================================================

/// Cached library info returned to frontend
#[derive(specta::Type, Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct CachedLibrary {
    pub id: String,
    pub server_id: String,
    pub name: String,
    pub collection_type: Option<String>,
    pub image_tag: Option<String>,
}

/// Cached media item returned to frontend
#[derive(specta::Type, Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct CachedItem {
    pub id: String,
    pub name: String,
    pub item_type: String,
    pub parent_id: Option<String>,
    pub library_id: Option<String>,
    pub overview: Option<String>,
    pub genres: Option<String>,
    pub runtime_ticks: Option<i64>,
    pub production_year: Option<i32>,
    pub community_rating: Option<f64>,
    pub official_rating: Option<String>,
    pub primary_image_tag: Option<String>,
    // Music-specific
    pub album_id: Option<String>,
    pub album_name: Option<String>,
    pub album_artist: Option<String>,
    pub artists: Option<String>,
    pub index_number: Option<i32>,
    // TV-specific
    pub series_id: Option<String>,
    pub series_name: Option<String>,
    pub season_id: Option<String>,
    pub season_name: Option<String>,
    pub parent_index_number: Option<i32>,
}

/// Get cached libraries for a server
#[tauri::command]
#[specta::specta]
pub async fn storage_get_libraries(
    db: State<'_, DatabaseWrapper>,
    server_id: String,
) -> Result<Vec<CachedLibrary>, String> {
    let db_service = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        Arc::new(database.service())
    };

    let query = Query::with_params(
        "SELECT id, server_id, name, collection_type, image_tag
         FROM libraries
         WHERE server_id = ?
         ORDER BY sort_order ASC, name ASC",
        vec![QueryParam::String(server_id)],
    );

    let libraries = db_service
        .query_many(query, |row| {
            Ok(CachedLibrary {
                id: row.get(0)?,
                server_id: row.get(1)?,
                name: row.get(2)?,
                collection_type: row.get(3)?,
                image_tag: row.get(4)?,
            })
        })
        .await
        .map_err(|e| e.to_string())?;

    Ok(libraries)
}

fn row_to_cached_item(row: &rusqlite::Row) -> rusqlite::Result<CachedItem> {
    Ok(CachedItem {
        id: row.get(0)?,
        name: row.get(1)?,
        item_type: row.get(2)?,
        parent_id: row.get(3)?,
        library_id: row.get(4)?,
        overview: row.get(5)?,
        genres: row.get(6)?,
        runtime_ticks: row.get(7)?,
        production_year: row.get(8)?,
        community_rating: row.get(9)?,
        official_rating: row.get(10)?,
        primary_image_tag: row.get(11)?,
        album_id: row.get(12)?,
        album_name: row.get(13)?,
        album_artist: row.get(14)?,
        artists: row.get(15)?,
        index_number: row.get(16)?,
        series_id: row.get(17)?,
        series_name: row.get(18)?,
        season_id: row.get(19)?,
        season_name: row.get(20)?,
        parent_index_number: row.get(21)?,
    })
}

/// Get cached items with optional filtering
#[tauri::command]
#[specta::specta]
pub async fn storage_get_items(
    db: State<'_, DatabaseWrapper>,
    server_id: String,
    parent_id: Option<String>,
    library_id: Option<String>,
    item_type: Option<String>,
    limit: Option<i32>,
    offset: Option<i32>,
) -> Result<Vec<CachedItem>, String> {
    let db_service = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        Arc::new(database.service())
    };

    // Build base query
    let base_select = "SELECT id, name, item_type, parent_id, library_id, overview, genres,
                runtime_ticks, production_year, community_rating, official_rating,
                primary_image_tag, album_id, album_name, album_artist, artists,
                index_number, series_id, series_name, season_id, season_name,
                parent_index_number
         FROM items
         WHERE server_id = ?";

    let mut conditions = Vec::new();
    let mut params = vec![QueryParam::String(server_id)];

    if let Some(pid) = parent_id {
        conditions.push("parent_id = ?");
        params.push(QueryParam::String(pid));
    }

    if let Some(lid) = library_id {
        conditions.push("library_id = ?");
        params.push(QueryParam::String(lid));
    }

    if let Some(itype) = item_type {
        conditions.push("item_type = ?");
        params.push(QueryParam::String(itype));
    }

    let mut sql = base_select.to_string();
    for cond in &conditions {
        sql.push_str(&format!(" AND {}", cond));
    }
    sql.push_str(" ORDER BY sort_name ASC, name ASC");

    if let Some(lim) = limit {
        sql.push_str(&format!(" LIMIT {}", lim));
    }
    if let Some(off) = offset {
        sql.push_str(&format!(" OFFSET {}", off));
    }

    let query = Query::with_params(sql, params);

    let items = db_service
        .query_many(query, row_to_cached_item)
        .await
        .map_err(|e| e.to_string())?;

    Ok(items)
}

/// Get a single cached item by ID
#[tauri::command]
#[specta::specta]
pub async fn storage_get_item(
    db: State<'_, DatabaseWrapper>,
    item_id: String,
) -> Result<Option<CachedItem>, String> {
    let db_service = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        Arc::new(database.service())
    };

    let query = Query::with_params(
        "SELECT id, name, item_type, parent_id, library_id, overview, genres,
                runtime_ticks, production_year, community_rating, official_rating,
                primary_image_tag, album_id, album_name, album_artist, artists,
                index_number, series_id, series_name, season_id, season_name,
                parent_index_number
         FROM items WHERE id = ?",
        vec![QueryParam::String(item_id)],
    );

    db_service
        .query_optional(query, row_to_cached_item)
        .await
        .map_err(|e| e.to_string())
}

/// Search cached items using FTS
#[tauri::command]
#[specta::specta]
pub async fn storage_search_items(
    db: State<'_, DatabaseWrapper>,
    server_id: String,
    query: String,
    limit: Option<i32>,
) -> Result<Vec<CachedItem>, String> {
    let db_service = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        Arc::new(database.service())
    };

    // Escape FTS special characters and add prefix matching
    let fts_query = format!("{}*", query.replace('"', "\"\""));

    let limit_clause = limit.map(|l| format!(" LIMIT {}", l)).unwrap_or_default();

    let sql = format!(
        "SELECT i.id, i.name, i.item_type, i.parent_id, i.library_id, i.overview, i.genres,
                i.runtime_ticks, i.production_year, i.community_rating, i.official_rating,
                i.primary_image_tag, i.album_id, i.album_name, i.album_artist, i.artists,
                i.index_number, i.series_id, i.series_name, i.season_id, i.season_name,
                i.parent_index_number
         FROM items i
         JOIN items_fts fts ON fts.rowid = i.rowid
         WHERE i.server_id = ? AND items_fts MATCH ?
         ORDER BY rank{}",
        limit_clause
    );

    let query_obj = Query::with_params(
        sql,
        vec![QueryParam::String(server_id), QueryParam::String(fts_query)],
    );

    let items = db_service
        .query_many(query_obj, row_to_cached_item)
        .await
        .map_err(|e| e.to_string())?;

    Ok(items)
}

/// Save a library to the cache
#[tauri::command]
#[specta::specta]
pub async fn storage_save_library(
    db: State<'_, DatabaseWrapper>,
    id: String,
    server_id: String,
    name: String,
    collection_type: Option<String>,
    image_tag: Option<String>,
    sort_order: Option<i32>,
) -> Result<(), String> {
    let db_service = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        Arc::new(database.service())
    };

    let query = Query::with_params(
        "INSERT OR REPLACE INTO libraries (id, server_id, name, collection_type, image_tag, sort_order, synced_at)
         VALUES (?, ?, ?, ?, ?, ?, CURRENT_TIMESTAMP)",
        vec![
            QueryParam::String(id),
            QueryParam::String(server_id),
            QueryParam::String(name),
            collection_type.map(QueryParam::String).unwrap_or(QueryParam::Null),
            image_tag.map(QueryParam::String).unwrap_or(QueryParam::Null),
            QueryParam::Int(sort_order.unwrap_or(0)),
        ],
    );

    db_service.execute(query).await.map_err(|e| e.to_string())?;
    Ok(())
}

/// Save an item to the cache
#[tauri::command]
#[specta::specta]
pub async fn storage_save_item(
    db: State<'_, DatabaseWrapper>,
    item: CachedItem,
    server_id: String,
) -> Result<(), String> {
    let db_service = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        Arc::new(database.service())
    };

    // Generate sort_name from name (remove leading "The ", "A ", etc.)
    let sort_name = item
        .name
        .strip_prefix("The ")
        .or_else(|| item.name.strip_prefix("A "))
        .or_else(|| item.name.strip_prefix("An "))
        .unwrap_or(&item.name)
        .to_string();

    let query = Query::with_params(
        "INSERT OR REPLACE INTO items (
            id, server_id, library_id, parent_id, name, sort_name, item_type,
            overview, genres, runtime_ticks, production_year, community_rating,
            official_rating, primary_image_tag, album_id, album_name, album_artist,
            artists, index_number, series_id, series_name, season_id, season_name,
            parent_index_number, synced_at
         ) VALUES (
            ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?,
            ?, ?, ?, ?, ?, ?, ?, ?, CURRENT_TIMESTAMP
         )",
        vec![
            QueryParam::String(item.id),
            QueryParam::String(server_id),
            item.library_id
                .map(QueryParam::String)
                .unwrap_or(QueryParam::Null),
            item.parent_id
                .map(QueryParam::String)
                .unwrap_or(QueryParam::Null),
            QueryParam::String(item.name),
            QueryParam::String(sort_name),
            QueryParam::String(item.item_type),
            item.overview
                .map(QueryParam::String)
                .unwrap_or(QueryParam::Null),
            item.genres
                .map(QueryParam::String)
                .unwrap_or(QueryParam::Null),
            item.runtime_ticks
                .map(QueryParam::Int64)
                .unwrap_or(QueryParam::Null),
            item.production_year
                .map(QueryParam::Int)
                .unwrap_or(QueryParam::Null),
            item.community_rating
                .map(QueryParam::Float)
                .unwrap_or(QueryParam::Null),
            item.official_rating
                .map(QueryParam::String)
                .unwrap_or(QueryParam::Null),
            item.primary_image_tag
                .map(QueryParam::String)
                .unwrap_or(QueryParam::Null),
            item.album_id
                .map(QueryParam::String)
                .unwrap_or(QueryParam::Null),
            item.album_name
                .map(QueryParam::String)
                .unwrap_or(QueryParam::Null),
            item.album_artist
                .map(QueryParam::String)
                .unwrap_or(QueryParam::Null),
            item.artists
                .map(QueryParam::String)
                .unwrap_or(QueryParam::Null),
            item.index_number
                .map(QueryParam::Int)
                .unwrap_or(QueryParam::Null),
            item.series_id
                .map(QueryParam::String)
                .unwrap_or(QueryParam::Null),
            item.series_name
                .map(QueryParam::String)
                .unwrap_or(QueryParam::Null),
            item.season_id
                .map(QueryParam::String)
                .unwrap_or(QueryParam::Null),
            item.season_name
                .map(QueryParam::String)
                .unwrap_or(QueryParam::Null),
            item.parent_index_number
                .map(QueryParam::Int)
                .unwrap_or(QueryParam::Null),
        ],
    );

    db_service.execute(query).await.map_err(|e| e.to_string())?;
    Ok(())
}

/// Get count of pending sync operations for a user
#[tauri::command]
#[specta::specta]
pub async fn storage_get_pending_sync_count(
    db: State<'_, DatabaseWrapper>,
    user_id: String,
) -> Result<i32, String> {
    let db_service = {
        let database = db.0.lock().map_err(|e| e.to_string())?;
        Arc::new(database.service())
    };

    let query = Query::with_params(
        "SELECT COUNT(*) FROM user_data WHERE user_id = ? AND pending_sync = 1",
        vec![QueryParam::String(user_id)],
    );

    let count: i32 = db_service
        .query_one(query, |row| row.get(0))
        .await
        .map_err(|e| e.to_string())?;

    Ok(count)
}

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

    #[test]
    fn test_server_info_serialization() {
        let server = ServerInfo {
            id: "server-123".to_string(),
            name: "My Server".to_string(),
            url: "https://jellyfin.example.com".to_string(),
            version: Some("10.8.0".to_string()),
        };

        let json = serde_json::to_string(&server);
        assert!(json.is_ok());
        let serialized = json.unwrap();
        assert!(serialized.contains("server-123"));
        assert!(serialized.contains("My Server"));
    }

    #[test]
    fn test_server_info_without_version() {
        let server = ServerInfo {
            id: "server-456".to_string(),
            name: "Test Server".to_string(),
            url: "https://test.local".to_string(),
            version: None,
        };

        let json = serde_json::to_string(&server).unwrap();
        assert!(json.contains("null") || json.contains("\"version\":null"));
    }

    #[test]
    fn test_server_info_roundtrip() {
        let original = ServerInfo {
            id: "srv-999".to_string(),
            name: "Production".to_string(),
            url: "https://prod.jellyfin.example.com:8096".to_string(),
            version: Some("10.9.0".to_string()),
        };

        let json = serde_json::to_string(&original).unwrap();
        let deserialized: ServerInfo = serde_json::from_str(&json).unwrap();

        assert_eq!(original.id, deserialized.id);
        assert_eq!(original.name, deserialized.name);
        assert_eq!(original.url, deserialized.url);
        assert_eq!(original.version, deserialized.version);
    }

    #[test]
    fn test_user_info_serialization() {
        let user = UserInfo {
            id: "user-123".to_string(),
            server_id: "server-456".to_string(),
            username: "john_doe".to_string(),
            is_active: true,
        };

        let json = serde_json::to_string(&user);
        assert!(json.is_ok());
        let serialized = json.unwrap();
        assert!(serialized.contains("user-123"));
        assert!(serialized.contains("john_doe"));
    }

    #[test]
    fn test_user_info_inactive() {
        let user = UserInfo {
            id: "user-inactive".to_string(),
            server_id: "server-789".to_string(),
            username: "jane_doe".to_string(),
            is_active: false,
        };

        let json = serde_json::to_string(&user).unwrap();
        assert!(json.contains("false"));

        let deserialized: UserInfo = serde_json::from_str(&json).unwrap();
        assert!(!deserialized.is_active);
    }

    #[test]
    fn test_active_session_serialization() {
        let session = ActiveSession {
            user_id: "user-001".to_string(),
            username: "alice".to_string(),
            server_id: "server-001".to_string(),
            server_url: "https://jellyfin.example.com".to_string(),
            server_name: "Home Jellyfin".to_string(),
            access_token: "very-long-token-string-abc123".to_string(),
        };

        let json = serde_json::to_string(&session);
        assert!(json.is_ok());
        let serialized = json.unwrap();
        assert!(serialized.contains("alice"));
        assert!(serialized.contains("Home Jellyfin"));
    }

    #[test]
    fn test_active_session_roundtrip() {
        let original = ActiveSession {
            user_id: "u999".to_string(),
            username: "testuser".to_string(),
            server_id: "s999".to_string(),
            server_url: "https://test.example.com:8096".to_string(),
            server_name: "Test Server".to_string(),
            access_token: "token-xyz".to_string(),
        };

        let json = serde_json::to_string(&original).unwrap();
        let deserialized: ActiveSession = serde_json::from_str(&json).unwrap();

        assert_eq!(original.user_id, deserialized.user_id);
        assert_eq!(original.username, deserialized.username);
        assert_eq!(original.access_token, deserialized.access_token);
    }

    #[test]
    fn test_security_status_with_keyring() {
        let status = SecurityStatus {
            using_keyring: true,
            storage_type: "system_keyring".to_string(),
        };

        let json = serde_json::to_string(&status).unwrap();
        assert!(json.contains("true"));
        assert!(json.contains("system_keyring"));
    }

    #[test]
    fn test_security_status_with_encrypted_file() {
        let status = SecurityStatus {
            using_keyring: false,
            storage_type: "encrypted_file".to_string(),
        };

        let json = serde_json::to_string(&status).unwrap();
        assert!(json.contains("false"));
        assert!(json.contains("encrypted_file"));
    }

    #[test]
    fn test_playback_progress_serialization() {
        let progress = PlaybackProgress {
            item_id: "item-123".to_string(),
            position_ms: 150_000_000,
            is_played: true,
            is_favorite: false,
            play_count: 3,
        };

        let json = serde_json::to_string(&progress);
        assert!(json.is_ok());
        let serialized = json.unwrap();
        assert!(serialized.contains("item-123"));
        assert!(serialized.contains("150000000"));
    }

    #[test]
    fn test_playback_progress_played_status() {
        let progress = PlaybackProgress {
            item_id: "item-456".to_string(),
            position_ms: 0,
            is_played: true,
            is_favorite: true,
            play_count: 1,
        };

        let json = serde_json::to_string(&progress).unwrap();
        let deserialized: PlaybackProgress = serde_json::from_str(&json).unwrap();

        assert!(deserialized.is_played);
        assert!(deserialized.is_favorite);
        assert_eq!(deserialized.play_count, 1);
    }

    #[test]
    fn test_playback_progress_not_played() {
        let progress = PlaybackProgress {
            item_id: "item-789".to_string(),
            position_ms: 30_000_000,
            is_played: false,
            is_favorite: false,
            play_count: 0,
        };

        let json = serde_json::to_string(&progress).unwrap();
        let deserialized: PlaybackProgress = serde_json::from_str(&json).unwrap();

        assert!(!deserialized.is_played);
        assert_eq!(deserialized.play_count, 0);
    }

    #[test]
    fn test_database_wrapper_structure() {
        // Verify DatabaseWrapper can be created and holds Mutex<Database>
        assert!(std::mem::size_of::<DatabaseWrapper>() > 0);
    }

    #[test]
    fn test_credential_store_wrapper_structure() {
        // Verify CredentialStoreWrapper can be created
        assert!(std::mem::size_of::<CredentialStoreWrapper>() > 0);
    }

    #[test]
    fn test_thumbnail_cache_wrapper_structure() {
        // Verify ThumbnailCacheWrapper holds Arc<ThumbnailCache>
        assert!(std::mem::size_of::<ThumbnailCacheWrapper>() > 0);
    }

    #[test]
    fn test_user_info_camel_case() {
        let user = UserInfo {
            id: "u1".to_string(),
            server_id: "s1".to_string(),
            username: "user1".to_string(),
            is_active: true,
        };

        let json = serde_json::to_string(&user).unwrap();
        // Verify camelCase serialization
        assert!(json.contains("serverId"));
        assert!(json.contains("isActive"));
    }

    #[test]
    fn test_active_session_camel_case() {
        let session = ActiveSession {
            user_id: "u1".to_string(),
            username: "user1".to_string(),
            server_id: "s1".to_string(),
            server_url: "url1".to_string(),
            server_name: "name1".to_string(),
            access_token: "token1".to_string(),
        };

        let json = serde_json::to_string(&session).unwrap();
        // Verify camelCase serialization
        assert!(json.contains("userId"));
        assert!(json.contains("serverId"));
        assert!(json.contains("serverUrl"));
        assert!(json.contains("serverName"));
        assert!(json.contains("accessToken"));
    }

    #[test]
    fn test_playback_progress_camel_case() {
        let progress = PlaybackProgress {
            item_id: "i1".to_string(),
            position_ms: 100,
            is_played: true,
            is_favorite: false,
            play_count: 1,
        };

        let json = serde_json::to_string(&progress).unwrap();
        // Verify camelCase serialization
        assert!(json.contains("itemId"));
        assert!(json.contains("positionMs"));
        assert!(json.contains("isPlayed"));
        assert!(json.contains("isFavorite"));
        assert!(json.contains("playCount"));
    }
}