import prompts from "prompts";
import { file as fs } from "./file";
import ejs from "ejs";
import { join, resolve, sep } from "path";
import { warning } from "./console";

abstract class Generator {

  protected answers: {} | null = null;
  protected RUN: string;  //  RUN: 项目初始化目录
  private dir: string;    //  dir: 项目运行目录
  protected PATH: string; // PATH: 项目根目录
  protected TPL: string;  //  TPL: 模板目录


  protected constructor() {
    this.RUN = join(resolve(process.cwd()), sep);
    let dir = this.dir = join(resolve(__dirname));
    let path = this.PATH = this.dir.substring(0, dir.lastIndexOf("extend"));
    this.TPL = join(path, "template/");

    this.run().catch(() => {
      console.log(warning("🦠 项目创建失败，程序已自动退出"));
    });
  }

  /*
   * 自动指令中枢：
   * @description 自动调用 CLI 过程中的5大阶段
   */
  private async run() {
    await this.Initialize();
    await this.Prompting();
    await this.Writing();
    await this.Installing();
    await this.Ending();
  }

  // ----------------------------------------------------------------------
  // 5 大阶段
  protected Initialize() {}

  protected Prompting() {}

  protected Writing() {}

  protected Installing() {}

  protected Ending() {}

  // 5 大阶段
  // ----------------------------------------------------------------------


  protected easyCopy(file: string) {
    // @ts-ignore
    return fs.copy(join(this.TPL, file), join(this.RUN, this.answers.appName, file));
  }

  protected async easyTpl(file: string) {
    // @ts-ignore
    const [compileContent] = await Promise.all([ejs.renderFile(join(this.TPL, file), this.answers)]);
    // @ts-ignore
    return fs.write(join(this.RUN, this.answers.appName, file), compileContent);
  }

  // 提问题，并传回问题答案
  protected async prompt(question: prompts.PromptObject<string> | prompts.PromptObject<string>[]) {
    return this.answers = await prompts(question);
  }

}

export { Generator };