use std::sync::Arc;
use tauri::{AppHandle, Manager, State};

use crate::commands::connection_secrets::{
    create_secret_store, load_connections_from_file, save_connections_to_file,
};

pub use dbx_core::connection::{
    connection_url_for_endpoint, expand_tilde, redacted_connection_url_for_endpoint, AppState,
    PoolKind,
};
use dbx_core::db;
use dbx_core::models::connection::{ConnectionConfig, DatabaseType};

fn connections_file(app: &AppHandle) -> Result<std::path::PathBuf, String> {
    let dir = app.path().app_data_dir().map_err(|e| e.to_string())?;
    std::fs::create_dir_all(&dir).map_err(|e| e.to_string())?;
    Ok(dir.join("connections.json"))
}

fn sidebar_layout_file(app: &AppHandle) -> Result<std::path::PathBuf, String> {
    let dir = app.path().app_data_dir().map_err(|e| e.to_string())?;
    std::fs::create_dir_all(&dir).map_err(|e| e.to_string())?;
    Ok(dir.join("sidebar_layout.json"))
}

#[tauri::command]
pub async fn save_connections(
    app: AppHandle,
    configs: Vec<ConnectionConfig>,
) -> Result<(), String> {
    let path = connections_file(&app)?;
    let store = create_secret_store(&app);
    save_connections_to_file(&path, &configs, &*store)
}

#[tauri::command]
pub async fn load_connections(app: AppHandle) -> Result<Vec<ConnectionConfig>, String> {
    let path = connections_file(&app)?;
    let store = create_secret_store(&app);
    load_connections_from_file(&path, &*store)
}

#[tauri::command]
pub async fn save_sidebar_layout(
    app: AppHandle,
    layout: serde_json::Value,
) -> Result<(), String> {
    let path = sidebar_layout_file(&app)?;
    let json = serde_json::to_string_pretty(&layout).map_err(|e| e.to_string())?;
    std::fs::write(&path, json).map_err(|e| e.to_string())
}

#[tauri::command]
pub async fn load_sidebar_layout(app: AppHandle) -> Result<Option<serde_json::Value>, String> {
    let path = sidebar_layout_file(&app)?;
    if !path.exists() {
        return Ok(None);
    }
    let content = std::fs::read_to_string(&path).map_err(|e| e.to_string())?;
    let value: serde_json::Value = serde_json::from_str(&content).map_err(|e| e.to_string())?;
    Ok(Some(value))
}

#[tauri::command]
pub async fn test_connection(
    state: State<'_, Arc<AppState>>,
    config: ConnectionConfig,
) -> Result<String, String> {
    let tunnel_id = format!("{}:test", config.id);
    let connection_id = if config.ssh_enabled && !config.ssh_host.is_empty() {
        tunnel_id.as_str()
    } else {
        config.id.as_str()
    };
    let (host, port) = state.connection_host_port(connection_id, &config).await?;
    let url = connection_url_for_endpoint(&config, &host, port);
    let target = redacted_connection_url_for_endpoint(&config, &host, port);
    log::info!(
        "[test_connection] db_type={:?} target={}",
        config.db_type,
        target
    );
    let result = match config.db_type {
        DatabaseType::Mysql if config.needs_bare_mysql() => {
            match db::mysql::connect_bare(&url).await {
                Ok(pool) => {
                    pool.close().await;
                    Ok("Connection successful".to_string())
                }
                Err(e) => Err(e),
            }
        },
        DatabaseType::Mysql => {
            match db::mysql::connect(&url).await {
                Ok(pool) => {
                    pool.close().await;
                    Ok("Connection successful".to_string())
                }
                Err(e) => Err(e),
            }
        },
        DatabaseType::Doris | DatabaseType::StarRocks => {
            match db::mysql::connect_bare(&url).await {
                Ok(pool) => {
                    pool.close().await;
                    Ok("Connection successful".to_string())
                }
                Err(e) => Err(e),
            }
        },
        DatabaseType::Postgres | DatabaseType::Redshift => match db::postgres::connect(&url).await {
            Ok(pool) => {
                pool.close().await;
                Ok("Connection successful".to_string())
            }
            Err(e) => Err(e),
        },
        DatabaseType::Sqlite => match db::sqlite::connect_path(&expand_tilde(&config.host)).await {
            Ok(pool) => {
                pool.close().await;
                Ok("Connection successful".to_string())
            }
            Err(e) => Err(e),
        },
        DatabaseType::Redis => {
            db::redis_driver::connect(&url)
                .await
                .map(|_| "Connection successful".to_string())
        }
        DatabaseType::DuckDb => {
            duckdb::Connection::open(&expand_tilde(&config.host))
                .map(|_| "Connection successful".to_string())
                .map_err(|e| e.to_string())
        }
        DatabaseType::MongoDb => match mongodb::Client::with_uri_str(&url).await {
            Ok(client) => client
                .list_database_names()
                .await
                .map(|_| "Connection successful".to_string())
                .map_err(|e| e.to_string()),
            Err(e) => Err(e.to_string()),
        },
        DatabaseType::ClickHouse => {
            let username = if config.username.is_empty() { None } else { Some(config.username.clone()) };
            let password = if config.password.is_empty() { None } else { Some(config.password.clone()) };
            let client = db::clickhouse_driver::ChClient::new(&url, username, password);
            db::clickhouse_driver::test_connection(&client)
                .await
                .map(|_| "Connection successful".to_string())
        }
        DatabaseType::SqlServer => db::sqlserver::connect(
            &host,
            port,
            &config.username,
            &config.password,
            config.database.as_deref(),
        )
        .await
        .map(|_| "Connection successful".to_string()),
        DatabaseType::Oracle => db::oracle_driver::connect(
            &host,
            port,
            config.database.as_deref().unwrap_or("ORCL"),
            &config.username,
            &config.password,
        )
        .await
        .map(|_| "Connection successful".to_string()),
        DatabaseType::Elasticsearch => {
            let client = db::elasticsearch_driver::EsClient::new(
                &url,
                Some(&config.username),
                Some(&config.password),
            );
            db::elasticsearch_driver::test_connection(&client)
                .await
                .map(|_| "Connection successful".to_string())
        }
    };

    if config.ssh_enabled && !config.ssh_host.is_empty() {
        state.tunnels.stop_tunnel(&tunnel_id).await;
    }

    result
}

#[tauri::command]
pub async fn connect_db(
    state: State<'_, Arc<AppState>>,
    config: ConnectionConfig,
) -> Result<String, String> {
    let id = config.id.clone();

    let (host, port) = state.connection_host_port(&id, &config).await?;
    let url = connection_url_for_endpoint(&config, &host, port);

    let pool = match config.db_type {
        DatabaseType::Mysql if config.needs_bare_mysql() => PoolKind::Mysql(db::mysql::connect_bare(&url).await?, true),
        DatabaseType::Mysql => PoolKind::Mysql(db::mysql::connect(&url).await?, false),
        DatabaseType::Doris | DatabaseType::StarRocks => PoolKind::Mysql(db::mysql::connect_bare(&url).await?, true),
        DatabaseType::Postgres | DatabaseType::Redshift => PoolKind::Postgres(db::postgres::connect(&url).await?),
        DatabaseType::Sqlite => PoolKind::Sqlite(db::sqlite::connect_path(&expand_tilde(&config.host)).await?),
        DatabaseType::Redis => {
            let con = db::redis_driver::connect(&url).await?;
            PoolKind::Redis(tokio::sync::Mutex::new(con))
        }
        DatabaseType::DuckDb => {
            let con = duckdb::Connection::open(&expand_tilde(&config.host)).map_err(|e| e.to_string())?;
            PoolKind::DuckDb(std::sync::Arc::new(std::sync::Mutex::new(con)))
        }
        DatabaseType::MongoDb => {
            let client = mongodb::Client::with_uri_str(&url).await.map_err(|e| e.to_string())?;
            PoolKind::MongoDb(client)
        }
        DatabaseType::ClickHouse => {
            let username = if config.username.is_empty() { None } else { Some(config.username.clone()) };
            let password = if config.password.is_empty() { None } else { Some(config.password.clone()) };
            let client = db::clickhouse_driver::ChClient::new(&url, username, password);
            db::clickhouse_driver::test_connection(&client).await?;
            PoolKind::ClickHouse(client)
        }
        DatabaseType::SqlServer => {
            let client = db::sqlserver::connect(
                &host,
                port,
                &config.username, &config.password,
                config.database.as_deref(),
            )
            .await?;
            PoolKind::SqlServer(std::sync::Arc::new(tokio::sync::Mutex::new(client)))
        }
        DatabaseType::Oracle => {
            let client = db::oracle_driver::connect(
                &host,
                port,
                config.database.as_deref().unwrap_or("ORCL"),
                &config.username,
                &config.password,
            )
            .await?;
            PoolKind::Oracle(std::sync::Arc::new(tokio::sync::Mutex::new(client)))
        }
        DatabaseType::Elasticsearch => {
            let client = db::elasticsearch_driver::EsClient::new(
                &url,
                Some(&config.username),
                Some(&config.password),
            );
            db::elasticsearch_driver::test_connection(&client).await?;
            PoolKind::Elasticsearch(client)
        }
    };

    state.connections.lock().await.insert(id.clone(), pool);
    state.configs.lock().await.insert(id.clone(), config);

    Ok(id)
}

#[tauri::command]
pub async fn disconnect_db(
    state: State<'_, Arc<AppState>>,
    connection_id: String,
) -> Result<(), String> {
    let mut conns = state.connections.lock().await;
    let keys_to_remove: Vec<String> = conns
        .keys()
        .filter(|k| *k == &connection_id || k.starts_with(&format!("{connection_id}:")))
        .cloned()
        .collect();
    for key in keys_to_remove {
        if let Some(pool) = conns.remove(&key) {
            match pool {
                PoolKind::Mysql(p, _) => p.close().await,
                PoolKind::Postgres(p) => p.close().await,
                PoolKind::Sqlite(p) => p.close().await,
                PoolKind::Redis(_) => {},
                PoolKind::DuckDb(_) => {},
                PoolKind::MongoDb(_) => {},
                PoolKind::ClickHouse(_) => {},
                PoolKind::SqlServer(_) => {},
                PoolKind::Oracle(_) => {},
                PoolKind::Elasticsearch(_) => {},
            }
        }
    }
    drop(conns);
    state.configs.lock().await.remove(&connection_id);
    state.tunnels.stop_tunnel(&connection_id).await;
    Ok(())
}