//! Trait definition for TdClient to enable dependency injection
//!
//! This trait allows tests to use FakeTdClient instead of real TDLib client.
#![allow(dead_code)]

use crate::tdlib::{AuthState, FolderInfo, MessageInfo, ProfileInfo, UserCache, UserOnlineStatus};
use crate::types::{ChatId, MessageId, UserId};
use async_trait::async_trait;
use std::borrow::Cow;
use std::path::PathBuf;
use tdlib_rs::enums::{ChatAction, Update};

use super::ChatInfo;

/// Auth operations.
#[async_trait]
pub trait AuthClient: Send {
    async fn send_phone_number(&self, phone: String) -> Result<(), String>;
    async fn send_code(&self, code: String) -> Result<(), String>;
    async fn send_password(&self, password: String) -> Result<(), String>;
}

/// Chat list and profile operations.
#[async_trait]
pub trait ChatClient: Send {
    async fn load_chats(&mut self, limit: i32) -> Result<(), String>;
    async fn load_folder_chats(&mut self, folder_id: i32, limit: i32) -> Result<(), String>;
    async fn leave_chat(&self, chat_id: ChatId) -> Result<(), String>;
    async fn get_profile_info(&self, chat_id: ChatId) -> Result<ProfileInfo, String>;

    fn chats(&self) -> &[ChatInfo];
    fn folders(&self) -> &[FolderInfo];
    fn main_chat_list_position(&self) -> i32;
    fn set_main_chat_list_position(&mut self, position: i32);
    fn update_chats<F>(&mut self, updater: F)
    where
        F: FnOnce(&mut Vec<ChatInfo>);
    fn update_folders<F>(&mut self, updater: F)
    where
        F: FnOnce(&mut Vec<FolderInfo>);
}

/// Ephemeral chat actions such as typing status.
#[async_trait]
pub trait ChatActionClient: Send {
    async fn send_chat_action(&self, chat_id: ChatId, action: ChatAction);
    fn clear_stale_typing_status(&mut self) -> bool;
    fn typing_status(&self) -> Option<&(UserId, String, std::time::Instant)>;
    fn set_typing_status(&mut self, status: Option<(UserId, String, std::time::Instant)>);
}

/// Message history, search, and mutation operations.
#[async_trait]
pub trait MessageClient: Send {
    async fn get_chat_history(
        &mut self,
        chat_id: ChatId,
        limit: i32,
    ) -> Result<Vec<MessageInfo>, String>;
    async fn load_older_messages(
        &mut self,
        chat_id: ChatId,
        from_message_id: MessageId,
    ) -> Result<Vec<MessageInfo>, String>;
    async fn get_pinned_messages(&mut self, chat_id: ChatId) -> Result<Vec<MessageInfo>, String>;
    async fn load_current_pinned_message(&mut self, chat_id: ChatId);
    async fn search_messages(
        &self,
        chat_id: ChatId,
        query: &str,
    ) -> Result<Vec<MessageInfo>, String>;

    async fn send_message(
        &mut self,
        chat_id: ChatId,
        text: String,
        reply_to_message_id: Option<MessageId>,
        reply_info: Option<super::ReplyInfo>,
    ) -> Result<MessageInfo, String>;

    async fn edit_message(
        &mut self,
        chat_id: ChatId,
        message_id: MessageId,
        new_text: String,
    ) -> Result<MessageInfo, String>;

    async fn delete_messages(
        &mut self,
        chat_id: ChatId,
        message_ids: Vec<MessageId>,
        revoke: bool,
    ) -> Result<(), String>;

    async fn forward_messages(
        &mut self,
        to_chat_id: ChatId,
        from_chat_id: ChatId,
        message_ids: Vec<MessageId>,
    ) -> Result<(), String>;

    async fn set_draft_message(&self, chat_id: ChatId, text: String) -> Result<(), String>;

    fn current_chat_messages(&self) -> Cow<'_, [MessageInfo]>;
    fn current_chat_id(&self) -> Option<ChatId>;
    fn current_pinned_message(&self) -> Option<MessageInfo>;
    fn push_message(&mut self, msg: MessageInfo);
    fn clear_current_chat_messages(&mut self);
    fn set_current_chat_messages(&mut self, messages: Vec<MessageInfo>);
    fn update_current_chat_messages<F>(&mut self, updater: F)
    where
        F: FnOnce(&mut Vec<MessageInfo>);
    fn set_current_chat_id(&mut self, chat_id: Option<ChatId>);
    fn set_current_pinned_message(&mut self, msg: Option<MessageInfo>);
    fn pending_view_messages(&self) -> &[(ChatId, Vec<MessageId>)];
    fn enqueue_pending_view_messages(&mut self, chat_id: ChatId, message_ids: Vec<MessageId>);
    async fn fetch_missing_reply_info(&mut self);
    async fn process_pending_view_messages(&mut self);
}

/// User cache and user-status operations.
#[async_trait]
pub trait UserClient: Send {
    fn get_user_status_by_chat_id(&self, chat_id: ChatId) -> Option<&UserOnlineStatus>;
    fn pending_user_ids(&self) -> &[UserId];
    fn user_cache(&self) -> &UserCache;
    fn update_user_cache<F>(&mut self, updater: F)
    where
        F: FnOnce(&mut UserCache);
    async fn process_pending_user_ids(&mut self);
}

/// Message reaction operations.
#[async_trait]
pub trait ReactionClient: Send {
    async fn get_message_available_reactions(
        &self,
        chat_id: ChatId,
        message_id: MessageId,
    ) -> Result<Vec<String>, String>;

    async fn toggle_reaction(
        &self,
        chat_id: ChatId,
        message_id: MessageId,
        reaction: String,
    ) -> Result<(), String>;
}

/// File download operations.
#[async_trait]
pub trait FileClient: Send {
    async fn download_file(&self, file_id: i32) -> Result<String, String>;
    async fn download_voice_note(&self, file_id: i32) -> Result<String, String>;
}

/// Shared client state that does not belong to one feature area.
#[async_trait]
pub trait ClientState: Send {
    fn client_id(&self) -> i32;
    async fn get_me(&self) -> Result<i64, String>;
    fn auth_state(&self) -> &AuthState;
    fn network_state(&self) -> super::types::NetworkState;
}

/// Notification configuration operations.
pub trait NotificationClient: Send {
    fn configure_notifications(&mut self, config: &crate::config::NotificationsConfig);
    fn sync_notification_muted_chats(&mut self);
}

/// Account switching operations.
#[async_trait]
pub trait AccountClient: Send {
    /// Recreates the client with a new database path (for account switching).
    ///
    /// For real TdClient: closes old client, creates new one, inits TDLib parameters.
    /// For FakeTdClient: no-op.
    async fn recreate_client(&mut self, db_path: PathBuf) -> Result<(), String>;
}

/// TDLib update routing.
pub trait UpdateClient: Send {
    fn handle_update(&mut self, update: Update);
}

/// Facade trait for TDLib client operations
///
/// This trait defines the interface for both real and fake TDLib clients,
/// enabling dependency injection and easier testing.
#[allow(dead_code)]
pub trait TdClientTrait:
    AuthClient
    + ChatClient
    + ChatActionClient
    + MessageClient
    + UserClient
    + ReactionClient
    + FileClient
    + ClientState
    + NotificationClient
    + AccountClient
    + UpdateClient
    + Send
{
}

impl<T> TdClientTrait for T where
    T: AuthClient
        + ChatClient
        + ChatActionClient
        + MessageClient
        + UserClient
        + ReactionClient
        + FileClient
        + ClientState
        + NotificationClient
        + AccountClient
        + UpdateClient
        + Send
{
}