import { OB11EmitEventContent, OB11NetworkReloadType } from './index';
import { NapCatOneBot11Adapter, OB11Message } from '@/napcat-onebot/index';
import { NapCatCore } from 'napcat-core';
import { PluginConfig } from '../config/config';
import { ActionMap } from '../action';
import { IOB11NetworkAdapter } from '@/napcat-onebot/network/adapter';
import fs from 'fs';
import path from 'path';

export interface PluginPackageJson {
  name?: string;
  plugin?: string;
  version?: string;
  main?: string;
}

export interface PluginModule<T extends OB11EmitEventContent = OB11EmitEventContent> {
  plugin_init: (core: NapCatCore, obContext: NapCatOneBot11Adapter, actions: ActionMap, instance: OB11PluginAdapter) => void | Promise<void>;
  plugin_onmessage?: (adapter: string, core: NapCatCore, obCtx: NapCatOneBot11Adapter, event: OB11Message, actions: ActionMap, instance: OB11PluginAdapter) => void | Promise<void>;
  plugin_onevent?: (adapter: string, core: NapCatCore, obCtx: NapCatOneBot11Adapter, event: T, actions: ActionMap, instance: OB11PluginAdapter) => void | Promise<void>;
  plugin_cleanup?: (core: NapCatCore, obContext: NapCatOneBot11Adapter, actions: ActionMap, instance: OB11PluginAdapter) => void | Promise<void>;
}

export interface LoadedPlugin {
  name: string;
  version?: string;
  pluginPath: string;
  entryPath: string;
  packageJson?: PluginPackageJson;
  module: PluginModule;
}

export class OB11PluginAdapter extends IOB11NetworkAdapter<PluginConfig> {
  private readonly pluginPath: string;
  private loadedPlugins: Map<string, LoadedPlugin> = new Map();
  declare config: PluginConfig;
  override get isActive (): boolean {
    return this.isEnable && this.loadedPlugins.size > 0;
  }

  constructor (
    name: string, core: NapCatCore, obContext: NapCatOneBot11Adapter, actions: ActionMap
  ) {
    const config = {
      name,
      messagePostFormat: 'array',
      reportSelfMessage: true,
      enable: true,
      debug: true,
    };
    super(name, config, core, obContext, actions);
    this.pluginPath = this.core.context.pathWrapper.pluginPath;
  }

  /**
     * 扫描并加载插件
     */
  private async loadPlugins (): Promise<void> {
    try {
      // 确保插件目录存在
      if (!fs.existsSync(this.pluginPath)) {
        this.logger.logWarn(`[Plugin Adapter] Plugin directory does not exist: ${this.pluginPath}`);
        fs.mkdirSync(this.pluginPath, { recursive: true });
        return;
      }

      const items = fs.readdirSync(this.pluginPath, { withFileTypes: true });

      // 扫描文件和目录
      for (const item of items) {
        if (item.isFile()) {
          // 处理单文件插件
          await this.loadFilePlugin(item.name);
        } else if (item.isDirectory()) {
          // 处理目录插件
          await this.loadDirectoryPlugin(item.name);
        }
      }

      this.logger.log(`[Plugin Adapter] Loaded ${this.loadedPlugins.size} plugins`);
    } catch (error) {
      this.logger.logError('[Plugin Adapter] Error loading plugins:', error);
    }
  }

  /**
     * 加载单文件插件 (.mjs, .js)
     */
  private async loadFilePlugin (filename: string): Promise<void> {
    // 只处理支持的文件类型
    if (!this.isSupportedFile(filename)) {
      return;
    }

    const filePath = path.join(this.pluginPath, filename);
    const pluginName = path.parse(filename).name;

    try {
      const module = await this.importModule(filePath);
      if (!this.isValidPluginModule(module)) {
        this.logger.logWarn(`[Plugin Adapter] File ${filename} is not a valid plugin (missing plugin methods)`);
        return;
      }

      const plugin: LoadedPlugin = {
        name: pluginName,
        pluginPath: this.pluginPath,
        entryPath: filePath,
        module,
      };

      await this.registerPlugin(plugin);
    } catch (error) {
      this.logger.logError(`[Plugin Adapter] Error loading file plugin ${filename}:`, error);
    }
  }

  /**
     * 加载目录插件
     */
  private async loadDirectoryPlugin (dirname: string): Promise<void> {
    const pluginDir = path.join(this.pluginPath, dirname);

    try {
      // 尝试读取 package.json
      let packageJson: PluginPackageJson | undefined;
      const packageJsonPath = path.join(pluginDir, 'package.json');

      if (fs.existsSync(packageJsonPath)) {
        try {
          const packageContent = fs.readFileSync(packageJsonPath, 'utf-8');
          packageJson = JSON.parse(packageContent);
        } catch (error) {
          this.logger.logWarn(`[Plugin Adapter] Invalid package.json in ${dirname}:`, error);
        }
      }

      // 确定入口文件
      const entryFile = this.findEntryFile(pluginDir, packageJson);
      if (!entryFile) {
        this.logger.logWarn(`[Plugin Adapter] No valid entry file found for plugin directory: ${dirname}`);
        return;
      }

      const entryPath = path.join(pluginDir, entryFile);
      const module = await this.importModule(entryPath);

      if (!this.isValidPluginModule(module)) {
        this.logger.logWarn(`[Plugin Adapter] Directory ${dirname} does not contain a valid plugin`);
        return;
      }

      const plugin: LoadedPlugin = {
        name: packageJson?.name || dirname,
        version: packageJson?.version,
        pluginPath: pluginDir,
        entryPath,
        packageJson,
        module,
      };

      await this.registerPlugin(plugin);
    } catch (error) {
      this.logger.logError(`[Plugin Adapter] Error loading directory plugin ${dirname}:`, error);
    }
  }

  /**
     * 查找插件目录的入口文件
     */
  private findEntryFile (pluginDir: string, packageJson?: PluginPackageJson): string | null {
    // 优先级：package.json main > 默认文件名
    const possibleEntries = [
      packageJson?.main,
      'index.mjs',
      'index.js',
      'main.mjs',
      'main.js',
    ].filter(Boolean) as string[];

    for (const entry of possibleEntries) {
      const entryPath = path.join(pluginDir, entry);
      if (fs.existsSync(entryPath) && fs.statSync(entryPath).isFile()) {
        return entry;
      }
    }

    return null;
  }

  /**
     * 检查是否为支持的文件类型
     */
  private isSupportedFile (filename: string): boolean {
    const ext = path.extname(filename).toLowerCase();
    return ['.mjs', '.js'].includes(ext);
  }

  /**
     * 动态导入模块
     */
  private async importModule (filePath: string): Promise<any> {
    const fileUrl = `file://${filePath.replace(/\\/g, '/')}`;
    return await import(fileUrl);
  }

  /**
     * 检查模块是否为有效的插件模块
     */
  private isValidPluginModule (module: any): module is PluginModule {
    return module && typeof module.plugin_init === 'function';
  }

  /**
     * 注册插件
     */
  private async registerPlugin (plugin: LoadedPlugin): Promise<void> {
    // 检查名称冲突
    if (this.loadedPlugins.has(plugin.name)) {
      this.logger.logWarn(`[Plugin Adapter] Plugin name conflict: ${plugin.name}, skipping...`);
      return;
    }

    this.loadedPlugins.set(plugin.name, plugin);
    this.logger.log(`[Plugin Adapter] Registered plugin: ${plugin.name}${plugin.version ? ` v${plugin.version}` : ''}`);

    // 调用插件初始化方法（必须存在）
    try {
      await plugin.module.plugin_init(this.core, this.obContext, this.actions, this);
      this.logger.log(`[Plugin Adapter] Initialized plugin: ${plugin.name}`);
    } catch (error) {
      this.logger.logError(`[Plugin Adapter] Error initializing plugin ${plugin.name}:`, error);
    }
  }

  /**
     * 卸载插件
     */
  private async unloadPlugin (pluginName: string): Promise<void> {
    const plugin = this.loadedPlugins.get(pluginName);
    if (!plugin) {
      return;
    }

    // 调用插件清理方法
    if (typeof plugin.module.plugin_cleanup === 'function') {
      try {
        await plugin.module.plugin_cleanup(this.core, this.obContext, this.actions, this);
        this.logger.log(`[Plugin Adapter] Cleaned up plugin: ${pluginName}`);
      } catch (error) {
        this.logger.logError(`[Plugin Adapter] Error cleaning up plugin ${pluginName}:`, error);
      }
    }

    this.loadedPlugins.delete(pluginName);
    this.logger.log(`[Plugin Adapter] Unloaded plugin: ${pluginName}`);
  }

  async onEvent<T extends OB11EmitEventContent> (event: T) {
    if (!this.isEnable) {
      return;
    }

    // 遍历所有已加载的插件，调用它们的事件处理方法
    for (const [, plugin] of this.loadedPlugins) {
      this.callPluginEventHandler(plugin, event);
    }
  }

  /**
     * 调用插件的事件处理方法
     */
  private async callPluginEventHandler (plugin: LoadedPlugin, event: OB11EmitEventContent): Promise<void> {
    try {
      // 优先使用 plugin_onevent 方法
      if (typeof plugin.module.plugin_onevent === 'function') {
        await plugin.module.plugin_onevent(this.name, this.core, this.obContext, event, this.actions, this);
      }

      // 如果是消息事件并且插件有 plugin_onmessage 方法，也调用
      if ((event as any).message_type && typeof plugin.module.plugin_onmessage === 'function') {
        await plugin.module.plugin_onmessage(this.name, this.core, this.obContext, event as OB11Message, this.actions, this);
      }
    } catch (error) {
      this.logger.logError(`[Plugin Adapter] Error calling plugin ${plugin.name} event handler:`, error);
    }
  }

  async open () {
    if (this.isEnable) {
      return;
    }

    this.logger.log('[Plugin Adapter] Opening plugin adapter...');
    this.isEnable = true;

    // 加载所有插件
    await this.loadPlugins();

    this.logger.log(`[Plugin Adapter] Plugin adapter opened with ${this.loadedPlugins.size} plugins loaded`);
  }

  async close () {
    if (!this.isEnable) {
      return;
    }

    this.logger.log('[Plugin Adapter] Closing plugin adapter...');
    this.isEnable = false;

    // 卸载所有插件
    const pluginNames = Array.from(this.loadedPlugins.keys());
    for (const pluginName of pluginNames) {
      await this.unloadPlugin(pluginName);
    }

    this.logger.log('[Plugin Adapter] Plugin adapter closed');
  }

  async reload () {
    this.logger.log('[Plugin Adapter] Reloading plugin adapter...');

    // 先关闭然后重新打开
    await this.close();
    await this.open();

    this.logger.log('[Plugin Adapter] Plugin adapter reloaded');
    return OB11NetworkReloadType.Normal;
  }

  /**
     * 获取已加载的插件列表
     */
  public getLoadedPlugins (): LoadedPlugin[] {
    return Array.from(this.loadedPlugins.values());
  }

  /**
     * 获取插件信息
     */
  public getPluginInfo (pluginName: string): LoadedPlugin | undefined {
    return this.loadedPlugins.get(pluginName);
  }

  /**
     * 重载指定插件
     */
  public async reloadPlugin (pluginName: string): Promise<boolean> {
    const plugin = this.loadedPlugins.get(pluginName);
    if (!plugin) {
      this.logger.logWarn(`[Plugin Adapter] Plugin ${pluginName} not found`);
      return false;
    }

    try {
      // 卸载插件
      await this.unloadPlugin(pluginName);

      // 重新加载插件
      const isDirectory = fs.statSync(plugin.pluginPath).isDirectory() &&
        plugin.pluginPath !== this.pluginPath;

      if (isDirectory) {
        const dirname = path.basename(plugin.pluginPath);
        await this.loadDirectoryPlugin(dirname);
      } else {
        const filename = path.basename(plugin.entryPath);
        await this.loadFilePlugin(filename);
      }

      this.logger.log(`[Plugin Adapter] Plugin ${pluginName} reloaded successfully`);
      return true;
    } catch (error) {
      this.logger.logError(`[Plugin Adapter] Error reloading plugin ${pluginName}:`, error);
      return false;
    }
  }
}
