/**
 * MetonaToast Plugins — 插件系统
 * @module plugins
 * @version 0.2.1
 */

import { t } from './i18n.js';
import type { Plugin, PluginManager as IPluginManager, PluginUtils } from './types.js';

/**
 * 插件管理器
 */
class PluginManager implements IPluginManager {
  plugins: Map<string, Plugin>;
  initialized: boolean;

  constructor() {
    this.plugins = new Map();
    this.initialized = false;
  }

  register(name: string, plugin: Plugin): PluginManager {
    if (this.plugins.has(name)) {
      console.warn(`Plugin "${name}" is already registered`);
      return this;
    }
    if (!plugin || typeof plugin !== 'object' || !plugin.name) {
      console.error(`Invalid plugin "${name}": must be an object with a "name" property`);
      return this;
    }

    const stored: Plugin = { ...plugin, installed: false, enabled: true };
    if (!stored.name) stored.name = name;
    this.plugins.set(name, stored);

    if (stored.install) {
      try {
        stored.install(this);
        stored.installed = true;
      } catch (e) {
        console.error(`Failed to install plugin "${name}":`, e);
      }
    }
    return this;
  }

  unregister(name: string): PluginManager {
    const plugin = this.plugins.get(name);
    if (!plugin) return this;
    if (plugin.uninstall) {
      try { plugin.uninstall(this); } catch (e) { console.error(`Failed to uninstall plugin "${name}":`, e); }
    }
    this.plugins.delete(name);
    return this;
  }

  get(name: string): Plugin | null { return this.plugins.get(name) || null; }
  has(name: string): boolean { return this.plugins.has(name); }
  getAll(): Plugin[] { return Array.from(this.plugins.values()); }
  getNames(): string[] { return Array.from(this.plugins.keys()); }

  enable(name: string): PluginManager {
    const p = this.plugins.get(name);
    if (p) p.enabled = true;
    return this;
  }
  disable(name: string): PluginManager {
    const p = this.plugins.get(name);
    if (p) p.enabled = false;
    return this;
  }
  isEnabled(name: string): boolean {
    const p = this.plugins.get(name);
    return p ? !!p.enabled : false;
  }

  destroy(): void {
    this.plugins.forEach((p) => {
      if (p.destroy) { try { p.destroy(this); } catch (_e) { /* noop */ } }
    });
    this.plugins.clear();
  }
}

/**
 * 预设插件
 */
const presetPlugins: Record<string, Plugin> = {
  /**
   * 键盘快捷键插件 — ESC 关闭所有 Toast
   */
  keyboard: {
    name: 'keyboard',
    version: '1.0.0',
    description: 'ESC 关闭所有 Toast',
    _handler: null as ((e: KeyboardEvent) => void) | null,

    install(this: Plugin) {
      if (typeof document === 'undefined') return;
      const handler = (e: KeyboardEvent) => {
        if (e.key === 'Escape') {
          document.querySelectorAll('.met-toast .met-close').forEach(btn => {
            try { (btn as HTMLElement).click(); } catch (_e) { /* noop */ }
          });
        }
      };
      (this as Record<string, unknown>)._handler = handler;
      document.addEventListener('keydown', handler);
    },

    uninstall(this: Plugin) {
      const handler = (this as Record<string, unknown>)._handler as ((e: KeyboardEvent) => void) | null;
      if (handler && typeof document !== 'undefined') {
        document.removeEventListener('keydown', handler);
        (this as Record<string, unknown>)._handler = null;
      }
    },
  },

  /**
   * 持久化插件 — 自动保存/加载配置到 localStorage
   */
  persistence: {
    name: 'persistence',
    version: '1.0.0',
    description: '自动持久化配置到 localStorage',
    storageKey: 'metona-toast-config',

    install(this: Plugin) {
      if (typeof localStorage !== 'undefined') {
        try {
          const key = (this as Record<string, unknown>).storageKey as string;
          const saved = localStorage.getItem(key);
          return saved ? JSON.parse(saved) : null;
        } catch (_e) { return null; }
      }
      return null;
    },

    save(this: Plugin, config: Record<string, unknown>) {
      if (typeof localStorage !== 'undefined') {
        try {
          const key = (this as Record<string, unknown>).storageKey as string;
          localStorage.setItem(key, JSON.stringify(config));
        } catch (_e) { /* noop */ }
      }
    },

    uninstall(this: Plugin) {
      if (typeof localStorage !== 'undefined') {
        try {
          const key = (this as Record<string, unknown>).storageKey as string;
          localStorage.removeItem(key);
        } catch (_e) { /* noop */ }
      }
    },
  },

  /**
   * 无障碍插件 — 屏幕阅读器公告
   */
  accessibility: {
    name: 'accessibility',
    version: '1.0.0',
    description: '通过屏幕阅读器朗读 Toast 内容',

    announce(toast: { type: string; title?: string; message?: string }) {
      if (typeof document === 'undefined') return;
      const el = document.createElement('div');
      el.setAttribute('aria-live', 'assertive');
      el.setAttribute('aria-atomic', 'true');
      el.style.cssText = 'position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;';
      const typeName = t(toast.type) || toast.type;
      el.textContent = `${typeName}: ${toast.title || ''} ${toast.message || ''}`;
      document.body.appendChild(el);
      setTimeout(() => { if (el.parentNode) el.parentNode.removeChild(el); }, 3000);
    },
  },
};

/**
 * 插件工具
 */
const pluginUtils: PluginUtils = {
  createManager(): PluginManager { return new PluginManager(); },
  register(name: string, plugin: Plugin): PluginManager { return defaultPluginManager.register(name, plugin); },
  unregister(name: string): PluginManager { return defaultPluginManager.unregister(name); },
  get(name: string): Plugin | null { return defaultPluginManager.get(name); },
  has(name: string): boolean { return defaultPluginManager.has(name); },
  getAll(): Plugin[] { return defaultPluginManager.getAll(); },
  getNames(): string[] { return defaultPluginManager.getNames(); },
  enable(name: string): PluginManager { return defaultPluginManager.enable(name); },
  disable(name: string): PluginManager { return defaultPluginManager.disable(name); },
  isEnabled(name: string): boolean { return defaultPluginManager.isEnabled(name); },
  getPreset(name: string): Plugin | null { return presetPlugins[name] || null; },
  getAllPresets(): Record<string, Plugin> { return { ...presetPlugins }; },

  createPlugin(config: Partial<Plugin>): Plugin {
    return {
      name: config.name || 'custom',
      version: config.version || '1.0.0',
      description: config.description || '',
      hooks: config.hooks || {},
      install: config.install || undefined,
      uninstall: config.uninstall || undefined,
      ...config,
    };
  },

  validatePlugin(plugin: Partial<Plugin>): { valid: boolean; errors: string[] } {
    const errors: string[] = [];
    if (!plugin || typeof plugin !== 'object') errors.push('Plugin must be an object');
    if (!plugin.name && !plugin.version) errors.push('Plugin must have a name or version');
    return { valid: errors.length === 0, errors };
  },
};

const defaultPluginManager = new PluginManager();

export { presetPlugins, pluginUtils, defaultPluginManager, PluginManager };