use async_trait::async_trait;
use solitaire_sync::{ChallengeGoal, LeaderboardEntry, SyncPayload, SyncResponse};
use thiserror::Error;

/// All errors that can arise during sync operations.
#[derive(Debug, Error)]
pub enum SyncError {
    #[error("unsupported platform for this sync backend")]
    UnsupportedPlatform,
    #[error("network error: {0}")]
    Network(String),
    #[error("authentication error: {0}")]
    Auth(String),
    #[error("serialization error: {0}")]
    Serialization(String),
}

/// Every sync backend implements this trait. The SyncPlugin only calls these
/// methods — it never matches on a backend enum variant.
#[async_trait]
pub trait SyncProvider: Send + Sync {
    /// Fetch the remote sync payload. Returns the latest server state for merging.
    async fn pull(&self) -> Result<SyncPayload, SyncError>;
    /// Push the local payload to the backend. Returns the merged server response.
    async fn push(&self, payload: &SyncPayload) -> Result<SyncResponse, SyncError>;
    /// Human-readable name of this backend, used in settings UI and logs.
    fn backend_name(&self) -> &'static str;
    /// Returns true if the user is currently authenticated with this backend.
    fn is_authenticated(&self) -> bool;
    /// Fetch the global leaderboard from this backend. Returns an empty list
    /// for backends that do not support leaderboards (e.g. `LocalOnlyProvider`).
    async fn fetch_leaderboard(&self) -> Result<Vec<LeaderboardEntry>, SyncError> {
        Ok(vec![])
    }
    /// Fetch today's daily challenge from the server. Returns `None` for
    /// backends that don't support it, or on any non-fatal network failure.
    async fn fetch_daily_challenge(&self) -> Result<Option<ChallengeGoal>, SyncError> {
        Ok(None)
    }
    /// Opt the authenticated player into the leaderboard with the given
    /// display name. No-op for backends that don't support leaderboards.
    async fn opt_in_leaderboard(&self, _display_name: &str) -> Result<(), SyncError> {
        Ok(())
    }
    /// Remove the authenticated player from the leaderboard.
    /// No-op for backends that don't support leaderboards.
    async fn opt_out_leaderboard(&self) -> Result<(), SyncError> {
        Ok(())
    }
    /// Permanently delete the authenticated player's account and all server
    /// data. No-op for backends that don't support account management.
    async fn delete_account(&self) -> Result<(), SyncError> {
        Ok(())
    }
    /// Upload a winning replay to the backend. On success, returns the
    /// shareable web URL the player can copy to their clipboard
    /// (`<server>/replays/<id>`). Default returns `UnsupportedPlatform`
    /// so backends without a server (e.g. `LocalOnlyProvider`) are
    /// silently no-op'd by the engine's push-on-win system, matching
    /// the same pattern `pull` / `push` follow.
    async fn push_replay(&self, _replay: &Replay) -> Result<String, SyncError> {
        Err(SyncError::UnsupportedPlatform)
    }
}

/// Blanket impl so `Box<dyn SyncProvider + Send + Sync>` (returned by
/// `provider_for_backend`) can be passed directly to `SyncPlugin::new`.
#[async_trait]
impl SyncProvider for Box<dyn SyncProvider + Send + Sync> {
    async fn pull(&self) -> Result<SyncPayload, SyncError> {
        (**self).pull().await
    }
    async fn push(&self, payload: &SyncPayload) -> Result<SyncResponse, SyncError> {
        (**self).push(payload).await
    }
    fn backend_name(&self) -> &'static str {
        (**self).backend_name()
    }
    fn is_authenticated(&self) -> bool {
        (**self).is_authenticated()
    }
    async fn fetch_leaderboard(&self) -> Result<Vec<LeaderboardEntry>, SyncError> {
        (**self).fetch_leaderboard().await
    }
    async fn fetch_daily_challenge(&self) -> Result<Option<ChallengeGoal>, SyncError> {
        (**self).fetch_daily_challenge().await
    }
    async fn opt_in_leaderboard(&self, display_name: &str) -> Result<(), SyncError> {
        (**self).opt_in_leaderboard(display_name).await
    }
    async fn opt_out_leaderboard(&self) -> Result<(), SyncError> {
        (**self).opt_out_leaderboard().await
    }
    async fn delete_account(&self) -> Result<(), SyncError> {
        (**self).delete_account().await
    }
    async fn push_replay(&self, replay: &Replay) -> Result<String, SyncError> {
        (**self).push_replay(replay).await
    }
}

pub mod stats;
pub use stats::{StatsExt, StatsSnapshot};

pub mod storage;
pub use storage::{
    TimeAttackSession, cleanup_orphaned_tmp_files, delete_game_state_at,
    delete_time_attack_session_at, game_state_file_path, load_game_state_from, load_stats,
    load_stats_from, load_time_attack_session_from, load_time_attack_session_from_at,
    save_game_state_to, save_stats, save_stats_to, save_time_attack_session_to, stats_file_path,
    time_attack_session_path, time_attack_session_with_now,
};

pub mod achievements;
pub use achievements::{
    AchievementRecord, achievements_file_path, load_achievements_from, save_achievements_to,
};

pub mod progress;
pub use progress::{
    PlayerProgress, XpBreakdown, daily_seed_for, level_for_xp, load_progress_from,
    progress_file_path, save_progress_to, xp_breakdown, xp_for_win,
};

pub mod weekly;
pub use weekly::{
    WEEKLY_GOAL_XP, WEEKLY_GOALS, WeeklyGoalContext, WeeklyGoalDef, WeeklyGoalKind,
    current_iso_week_key, weekly_goal_by_id,
};

pub mod challenge;
pub use challenge::{CHALLENGE_SEEDS, challenge_count, challenge_seed_for};

pub mod difficulty_seeds;
pub use difficulty_seeds::{DifficultySeeds, seeds_for};

pub mod settings;
pub use settings::{
    AnimSpeed, REPLAY_MOVE_INTERVAL_MAX_SECS, REPLAY_MOVE_INTERVAL_MIN_SECS,
    REPLAY_MOVE_INTERVAL_STEP_SECS, SOLVER_DEAL_RETRY_CAP, Settings, SyncBackend,
    TIME_BONUS_MULTIPLIER_MAX, TIME_BONUS_MULTIPLIER_MIN, TIME_BONUS_MULTIPLIER_STEP,
    TOOLTIP_DELAY_MAX_SECS, TOOLTIP_DELAY_MIN_SECS, TOOLTIP_DELAY_STEP_SECS, Theme, WindowGeometry,
    load_settings_from, save_settings_to, settings_file_path,
};

#[cfg(target_os = "android")]
pub mod android_jni;

#[cfg(target_os = "android")]
mod android_keystore;

#[cfg(not(target_arch = "wasm32"))]
pub mod auth_tokens;
#[cfg(not(target_arch = "wasm32"))]
pub use auth_tokens::{
    TokenError, delete_tokens, load_access_token, load_refresh_token, store_tokens,
};

pub mod sync_client;
pub use sync_client::LocalOnlyProvider;
#[cfg(not(target_arch = "wasm32"))]
pub use sync_client::{SolitaireServerClient, provider_for_backend};

pub mod replay;
pub use replay::{
    REPLAY_HISTORY_CAP, REPLAY_HISTORY_SCHEMA_VERSION, REPLAY_SCHEMA_VERSION, Replay,
    ReplayHistory, append_replay_to_history, load_replay_history_from,
    migrate_legacy_latest_replay, replay_history_path, save_replay_history_to,
};
// `latest_replay_path` is still consumed by the engine's one-shot legacy
// migration; `load_latest_replay_from`/`save_latest_replay_to` had no callers
// outside `replay.rs` and were dropped from the public surface.
#[allow(deprecated)]
pub use replay::latest_replay_path;

#[cfg(not(target_arch = "wasm32"))]
pub mod matomo_client;
#[cfg(not(target_arch = "wasm32"))]
pub use matomo_client::MatomoClient;

pub mod platform;
pub use platform::data_dir;

/// Application data subdirectory name, shared by all persistence modules.
pub(crate) const APP_DIR_NAME: &str = "ferrous_solitaire";
