/**
 * metona-sqlark Plugin — 插件系统
 * @module plugin
 *
 * 管理插件的注册、生命周期和钩子调度。
 */

import type { MetonaPlugin, HookName } from '../constants';

// ---------------------------------------------------------------------------
//  Hook 回调类型
// ---------------------------------------------------------------------------

export type HookCallback = (...args: unknown[]) => void | Promise<void>;

// ---------------------------------------------------------------------------
//  PluginManager
// ---------------------------------------------------------------------------

export class PluginManager {
  private plugins: MetonaPlugin[] = [];
  private hooks: Map<HookName, HookCallback[]> = new Map();

  /** 注册插件 */
  register(plugin: MetonaPlugin, db?: unknown): void {
    // 按优先级插入
    const priority = plugin.priority ?? 0;
    const insertIndex = this.plugins.findIndex(
      (p) => (p.priority ?? 0) < priority,
    );
    if (insertIndex === -1) {
      this.plugins.push(plugin);
    } else {
      this.plugins.splice(insertIndex, 0, plugin);
    }
    // 安装（传入 db 实例）
    plugin.install(db);
  }

  /** 卸载插件 */
  unregister(pluginName: string): void {
    const idx = this.plugins.findIndex((p) => p.name === pluginName);
    if (idx !== -1) {
      this.plugins[idx].destroy();
      this.plugins.splice(idx, 1);
    }
  }

  /** 获取所有已注册插件 */
  getPlugins(): MetonaPlugin[] {
    return [...this.plugins];
  }

  /** 添加钩子回调 */
  on(hook: HookName, callback: HookCallback): void {
    const callbacks = this.hooks.get(hook) ?? [];
    callbacks.push(callback);
    this.hooks.set(hook, callbacks);
  }

  /** 移除钩子回调 */
  off(hook: HookName, callback: HookCallback): void {
    const callbacks = this.hooks.get(hook);
    if (callbacks) {
      const idx = callbacks.indexOf(callback);
      if (idx !== -1) callbacks.splice(idx, 1);
    }
  }

  /** 触发钩子 */
  async trigger(hook: HookName, ...args: unknown[]): Promise<void> {
    const callbacks = this.hooks.get(hook);
    if (callbacks) {
      for (const cb of callbacks) {
        await cb(...args);
      }
    }
  }

  /** 销毁所有插件 */
  destroy(): void {
    for (const plugin of this.plugins) {
      try { plugin.destroy(); } catch (e) {
        // eslint-disable-next-line no-console
        console.warn(`[metona-sqlark] Plugin "${plugin.name}" destroy error:`, e);
      }
    }
    this.plugins = [];
    this.hooks.clear();
  }
}