import {
  AdapterHandlerOptions,
  AdapterInfo,
} from "@/core/plugin-handler/types";
import fs from "fs-extra";
import search, { Result } from "libnpmsearch";
import path from "path";
import got from "got";

import spwan from "cross-spawn";

/**
 * 系统插件管理器
 * @class AdapterHandler
 */
class AdapterHandler {
  // 插件安装地址
  public baseDir: string;
  // 插件源地址
  readonly registry: string;

  /**
   * Creates an instance of AdapterHandler.
   * @param {AdapterHandlerOptions} options
   * @memberof AdapterHandler
   */
  constructor(options: AdapterHandlerOptions) {
    // 初始化插件存放
    if (!fs.existsSync(options.baseDir)) {
      fs.mkdirsSync(options.baseDir);
      fs.writeFileSync(
        `${options.baseDir}/package.json`,
        '{"dependencies":{}}'
      );
    }
    this.baseDir = options.baseDir;
    this.registry = options.registry || "https://registry.npm.taobao.org";
  }

  /**
   * 获取插件信息
   * @param {string} adapter 插件名称
   * @param {string} adapterPath 插件指定路径
   * @memberof PluginHandler
   */
  async getAdapterInfo(
    adapter: string,
    adapterPath: string
  ): Promise<AdapterInfo> {
    let adapterInfo: AdapterInfo;
    const infoPath =
      adapterPath ||
      path.resolve(this.baseDir, "node_modules", adapter, "plugin.json");
    // 从本地获取
    if (await fs.pathExists(infoPath)) {
      adapterInfo = JSON.parse(
        fs.readFileSync(infoPath, "utf-8")
      ) as AdapterInfo;
    } else {
      // 本地没有从远程获取
      const resp = await got.get(
        `https://cdn.jsdelivr.net/npm/${adapter}/plugin.json`
      );
      // Todo 校验合法性
      adapterInfo = JSON.parse(resp.body) as AdapterInfo;
    }
    return adapterInfo;
  }

  // 安装并启动插件
  async install(adapters: Array<string>) {
    const installCmd = "install";
    // 安装
    await this.execCommand(installCmd, adapters);
  }

  /**
   * 从 npm 搜索插件
   * 传入 streamFunc 可以流式处理
   * @param {string} adapter 插件名称
   * @param {(data: Result) => void} [streamFunc] 流式处理钩子
   * @memberof AdapterHandler
   */
  async search(adapter: string, streamFunc?: (data: Result) => void) {
    return await new Promise<Result[]>((resolve, reject) => {
      const result: Result[] = [];
      const stream = search.stream(adapter);
      stream.on("data", (data: Result) => {
        result.push(data);
        if (streamFunc !== undefined) streamFunc(data);
      });
      stream.on("end", () => {
        resolve(result);
      });
      stream.on("error", (e: any) => {
        reject(e);
      });
    });
  }

  /**
   * 更新指定插件
   * @param {...string[]} adapters 插件名称
   * @memberof AdapterHandler
   */
  async update(...adapters: string[]) {
    await this.execCommand("update", adapters);
  }

  /**
   * 卸载指定插件
   * @param {...string[]} adapters 插件名称
   * @memberof AdapterHandler
   */
  async uninstall(adapters: string[]) {
    // 卸载插件
    await this.execCommand("uninstall", adapters);
  }

  /**
   * 列出所有已安装插件
   * @memberof AdapterHandler
   */
  async list() {
    const installInfo = JSON.parse(
      await fs.readFile(`${this.baseDir}/package.json`, "utf-8")
    );
    const adapters: string[] = [];
    for (const adapter in installInfo.dependencies) {
      adapters.push(adapter);
    }
    return adapters;
  }

  /**
   * 运行包管理器
   * @memberof AdapterHandler
   */
  private async execCommand(cmd: string, modules: string[]): Promise<string> {
    return new Promise((resolve: any, reject: any) => {
      let args: string[] = [cmd]
        .concat(modules)
        .concat("--color=always")
        .concat("--save");
      if (cmd !== "uninstall")
        args = args.concat(`--registry=${this.registry}`);
      const npm = spwan("npm", args, {
        cwd: this.baseDir,
      });

      let output = "";
      npm.stdout
        .on("data", (data: string) => {
          output += data; // 获取输出日志
        })
        .pipe(process.stdout);

      npm.stderr
        .on("data", (data: string) => {
          output += data; // 获取报错日志
        })
        .pipe(process.stderr);

      npm.on("close", (code: number) => {
        if (!code) {
          resolve({ code: 0, data: output }); // 如果没有报错就输出正常日志
        } else {
          reject({ code: code, data: output }); // 如果报错就输出报错日志
        }
      });
    });
  }
}

export default AdapterHandler;