use chrono::Utc;
use sea_orm::{ConnectionTrait, FromQueryResult, Statement};
use uuid::Uuid;

use erp_core::error::AppResult;
use erp_core::events::{DomainEvent, EventBus};

/// 启动插件通知监听器 — 订阅 plugin.trigger.* 事件
pub fn start_notification_listener(db: sea_orm::DatabaseConnection, event_bus: EventBus) {
    let (mut rx, _handle) = event_bus.subscribe_filtered("plugin.trigger.".to_string());

    tokio::spawn(async move {
        while let Some(event) = rx.recv().await {
            if let Err(e) = handle_trigger_event(&event, &db).await {
                tracing::warn!(
                    event_type = %event.event_type,
                    error = %e,
                    "Failed to handle plugin trigger notification"
                );
            }
        }
        tracing::info!("Plugin notification listener stopped");
    });
}

async fn handle_trigger_event(
    event: &DomainEvent,
    db: &sea_orm::DatabaseConnection,
) -> AppResult<()> {
    let plugin_id = event
        .payload
        .get("plugin_id")
        .and_then(|v| v.as_str())
        .unwrap_or("unknown");
    let trigger_name = event
        .payload
        .get("trigger_name")
        .and_then(|v| v.as_str())
        .unwrap_or("unknown");
    let entity = event
        .payload
        .get("entity")
        .and_then(|v| v.as_str())
        .unwrap_or("unknown");
    let action = event
        .payload
        .get("action")
        .and_then(|v| v.as_str())
        .unwrap_or("unknown");

    let title = format!("插件事件: {}.{}", plugin_id, trigger_name);
    let body = format!(
        "插件 [{}] 的实体 [{}] 触发了 [{}] 事件",
        plugin_id, entity, action
    );

    // 查询所有管理员用户
    #[derive(FromQueryResult)]
    struct AdminUser {
        id: Uuid,
    }

    let admins = AdminUser::find_by_statement(Statement::from_sql_and_values(
        sea_orm::DatabaseBackend::Postgres,
        r#"SELECT u.id FROM users u
           JOIN user_roles ur ON ur.user_id = u.id
           JOIN roles r ON r.id = ur.role_id
           WHERE u.tenant_id = $1 AND r.name = 'admin' AND u.deleted_at IS NULL"#,
        [event.tenant_id.into()],
    ))
    .all(db)
    .await
    .map_err(|e| erp_core::error::AppError::Internal(e.to_string()))?;

    // 为每个管理员插入消息记录
    let now = Utc::now();
    for admin in &admins {
        let msg_id = Uuid::now_v7();
        let sql = r#"
            INSERT INTO messages (id, tenant_id, sender_type, recipient_id, recipient_type,
                                  title, body, priority, is_read, created_at, updated_at, version)
            VALUES ($1, $2, 'system', $3, 'user', $4, $5, 'normal', false, $6, $7, 1)
        "#;
        db.execute(Statement::from_sql_and_values(
            sea_orm::DatabaseBackend::Postgres,
            sql,
            [
                msg_id.into(),
                event.tenant_id.into(),
                admin.id.into(),
                title.clone().into(),
                body.clone().into(),
                now.into(),
                now.into(),
            ],
        ))
        .await
        .map_err(|e| erp_core::error::AppError::Internal(e.to_string()))?;
    }

    tracing::info!(
        plugin_id = %plugin_id,
        trigger = %trigger_name,
        admin_count = admins.len(),
        "Plugin trigger notification sent"
    );

    Ok(())
}