import * as path from 'path'
import * as fs from 'fs-extra'
import * as inquirer from 'inquirer'
import * as semver from 'semver'
import * as request from 'request'
import * as ora from 'ora'
import {
  DEFAULT_TEMPLATE_SRC,
  DEFAULT_TEMPLATE_SRC_GITEE,
  TARO_CONFIG_FLODER,
  TARO_BASE_CONFIG,
  getUserHomeDir,
  chalk,
  SOURCE_DIR
} from '@tarojs/helper'
import { isArray } from '@tarojs/shared'

import { createApp } from './init'
import fetchTemplate from './fetchTemplate'
import Creator from './creator'

import type { ITemplates } from './fetchTemplate'

export interface IProjectConf {
  projectName: string;
  projectDir: string;
  templateSource: string;
  clone?: boolean;
  template: string;
  description?: string;
  typescript?: boolean;
  css: 'none' | 'sass' | 'stylus' | 'less';
  date?: string;
  src?: string;
  sourceRoot?: string;
  env?: string;
  autoInstall?: boolean,
  framework: 'nerv' | 'react' | 'vue' | 'vue3'
}

interface AskMethods {
  (conf: IProjectConf, prompts: object[], choices?: ITemplates[]): void;
}

const NONE_AVALIABLE_TEMPLATE = '无可用模板'

export default class Project extends Creator {
  public rootPath: string
  public conf: IProjectConf

  constructor (options: IProjectConf) {
    super(options.sourceRoot)
    const unSupportedVer = semver.lt(process.version, 'v7.6.0')
    if (unSupportedVer) {
      throw new Error('Node.js 版本过低，推荐升级 Node.js 至 v8.0.0+')
    }
    this.rootPath = this._rootPath

    this.conf = Object.assign(
      {
        projectName: '',
        projectDir: '',
        template: '',
        description: ''
      },
      options
    )
  }

  init () {
    console.log(chalk.green('Taro 即将创建一个新项目!'))
    console.log(`Need help? Go and open issue: ${chalk.blueBright('https://tls.jd.com/taro-issue-helper')}`)
    console.log()
  }

  async create () {
    try {
      const answers = await this.ask()
      const date = new Date()
      this.conf = Object.assign(this.conf, answers)
      this.conf.date = `${date.getFullYear()}-${date.getMonth() + 1}-${date.getDate()}`
      this.write()
    } catch (error) {
      console.log(chalk.red('创建项目失败: ', error))
    }
  }

  async ask () {
    let prompts: object[] = []
    const conf = this.conf

    this.askProjectName(conf, prompts)
    this.askDescription(conf, prompts)
    this.askFramework(conf, prompts)
    this.askTypescript(conf, prompts)
    this.askCSS(conf, prompts)
    await this.askTemplateSource(conf, prompts)

    const answers = await inquirer.prompt(prompts)

    prompts = []
    const templates = await this.fetchTemplates(answers)
    await this.askTemplate(conf, prompts, templates)
    const templateChoiceAnswer = await inquirer.prompt(prompts)

    return {
      ...answers,
      ...templateChoiceAnswer
    }
  }

  askProjectName: AskMethods = function (conf, prompts) {
    if ((typeof conf.projectName as string | undefined) !== 'string') {
      prompts.push({
        type: 'input',
        name: 'projectName',
        message: '请输入项目名称！',
        validate (input) {
          if (!input) {
            return '项目名不能为空！'
          }
          if (fs.existsSync(input)) {
            return '当前目录已经存在同名项目，请换一个项目名！'
          }
          return true
        }
      })
    } else if (fs.existsSync(conf.projectName)) {
      prompts.push({
        type: 'input',
        name: 'projectName',
        message: '当前目录已经存在同名项目，请换一个项目名！',
        validate (input) {
          if (!input) {
            return '项目名不能为空！'
          }
          if (fs.existsSync(input)) {
            return '项目名依然重复！'
          }
          return true
        }
      })
    }
  }

  askDescription: AskMethods = function (conf, prompts) {
    if (typeof conf.description !== 'string') {
      prompts.push({
        type: 'input',
        name: 'description',
        message: '请输入项目介绍！'
      })
    }
  }

  askTypescript: AskMethods = function (conf, prompts) {
    if (typeof conf.typescript !== 'boolean') {
      prompts.push({
        type: 'confirm',
        name: 'typescript',
        message: '是否需要使用 TypeScript ？'
      })
    }
  }

  askCSS: AskMethods = function (conf, prompts) {
    const cssChoices = [
      {
        name: 'Sass',
        value: 'sass'
      },
      {
        name: 'Less',
        value: 'less'
      },
      {
        name: 'Stylus',
        value: 'stylus'
      },
      {
        name: '无',
        value: 'none'
      }
    ]

    if ((typeof conf.css as string | undefined) !== 'string') {
      prompts.push({
        type: 'list',
        name: 'css',
        message: '请选择 CSS 预处理器（Sass/Less/Stylus）',
        choices: cssChoices
      })
    }
  }

  askFramework: AskMethods = function (conf, prompts) {
    const frameworks = [
      {
        name: 'React',
        value: 'react'
      },
      {
        name: 'Nerv',
        value: 'nerv'
      },
      {
        name: 'Vue',
        value: 'vue'
      },
      {
        name: 'Vue3',
        value: 'vue3'
      }
    ]

    if ((typeof conf.framework as string | undefined) !== 'string') {
      prompts.push({
        type: 'list',
        name: 'framework',
        message: '请选择框架',
        choices: frameworks
      })
    }
  }

  askTemplateSource: AskMethods = async function (conf, prompts) {
    if (conf.template === 'default' || conf.templateSource) return

    const homedir = getUserHomeDir()
    const taroConfigPath = path.join(homedir, TARO_CONFIG_FLODER)
    const taroConfig = path.join(taroConfigPath, TARO_BASE_CONFIG)

    let localTemplateSource: string

    // 检查本地配置
    if (fs.existsSync(taroConfig)) {
      // 存在则把模板源读出来
      const config = await fs.readJSON(taroConfig)
      localTemplateSource = config?.templateSource
    } else {
      // 不存在则创建配置
      await fs.createFile(taroConfig)
      await fs.writeJSON(taroConfig, { templateSource: DEFAULT_TEMPLATE_SRC })
      localTemplateSource = DEFAULT_TEMPLATE_SRC
    }

    const choices = [
      {
        name: 'Gitee（最快）',
        value: DEFAULT_TEMPLATE_SRC_GITEE
      },
      {
        name: 'Github（最新）',
        value: DEFAULT_TEMPLATE_SRC
      },
      {
        name: '输入',
        value: 'self-input'
      },
      {
        name: '社区优质模板源',
        value: 'open-source'
      }
    ]

    if (localTemplateSource && localTemplateSource !== DEFAULT_TEMPLATE_SRC && localTemplateSource !== DEFAULT_TEMPLATE_SRC_GITEE) {
      choices.unshift({
        name: `本地模板源：${localTemplateSource}`,
        value: localTemplateSource
      })
    }

    prompts.push({
      type: 'list',
      name: 'templateSource',
      message: '请选择模板源',
      choices
    }, {
      type: 'input',
      name: 'templateSource',
      message: '请输入模板源！',
      when (answers) {
        return answers.templateSource === 'self-input'
      }
    }, {
      type: 'list',
      name: 'templateSource',
      message: '请选择社区模板源',
      async choices (answers) {
        const choices = await getOpenSourceTemplates(answers.framework)
        return choices
      },
      when (answers) {
        return answers.templateSource === 'open-source'
      }
    })
  }

  askTemplate: AskMethods = function (conf, prompts, list = []) {
    const choices = [
      {
        name: '默认模板',
        value: 'default'
      },
      ...list.map(item => ({
        name: item.desc ? `${item.name}（${item.desc}）` : item.name,
        value: item.name
      }))
    ]

    if ((typeof conf.template as 'string' | undefined) !== 'string') {
      prompts.push({
        type: 'list',
        name: 'template',
        message: '请选择模板',
        choices
      })
    }
  }

  async fetchTemplates (answers): Promise<ITemplates[]> {
    const { templateSource, framework } = answers
    this.conf.templateSource = this.conf.templateSource || templateSource

    // 使用默认模版
    if (this.conf?.template === 'default' || answers.templateSource === NONE_AVALIABLE_TEMPLATE) return Promise.resolve([])

    // 从模板源下载模板
    const isClone = /gitee/.test(this.conf.templateSource) || this.conf.clone
    const templateChoices = await fetchTemplate(this.conf.templateSource, this.templatePath(''), isClone)

    // 根据用户选择的框架筛选模板
    const newTemplateChoices: ITemplates[] = templateChoices
      .filter(templateChoice => {
        const { platforms } = templateChoice
        if (typeof platforms === 'string' && platforms) {
          return framework === templateChoice.platforms
        } else if (isArray(platforms)) {
          return templateChoice.platforms?.includes(framework)
        } else {
          return true
        }
      })

    return newTemplateChoices
  }

  write (cb?: () => void) {
    this.conf.src = SOURCE_DIR
    createApp(this, this.conf, cb).catch(err => console.log(err))
  }
}

function getOpenSourceTemplates (platform) {
  return new Promise((resolve, reject) => {
    const spinner = ora('正在拉取开源模板列表...').start()
    request.get('https://gitee.com/NervJS/awesome-taro/raw/next/index.json', (error, _response, body) => {
      if (error) {
        spinner.fail(chalk.red('拉取开源模板列表失败！'))
        return reject(new Error())
      }

      spinner.succeed(`${chalk.grey('拉取开源模板列表成功！')}`)

      const collection = JSON.parse(body)

      switch (platform) {
        case 'react':
          return resolve(collection.react)
        case 'vue':
          return resolve(collection.vue)
        default:
          return resolve([NONE_AVALIABLE_TEMPLATE])
      }
    })
  })
}