import * as path from 'node:path'

import { CompilerType, createPage as createPageBinding, CSSType, FrameworkType, NpmType, PeriodType } from '@tarojs/binding'
import { babelKit, chalk, DEFAULT_TEMPLATE_SRC, fs, getUserHomeDir, resolveScriptPath, TARO_BASE_CONFIG, TARO_CONFIG_FOLDER } from '@tarojs/helper'

import { getPkgVersion, getRootPath, isNil } from '../util'
import { modifyPagesOrSubPackages } from '../util/createPage'
import { TEMPLATE_CREATOR } from './constants'
import Creator from './creator'
import fetchTemplate from './fetchTemplate'

export interface IPageConf {
  projectDir: string
  projectName: string
  npm: NpmType
  template: string
  clone?: boolean
  templateSource?: string
  description?: string
  pageName: string
  date?: string
  framework: FrameworkType
  css: CSSType
  typescript?: boolean
  compiler?: CompilerType
  isCustomTemplate?: boolean
  customTemplatePath?: string
  pageDir?: string
  subPkg?: string
}
interface IPageArgs extends IPageConf {
  modifyCustomTemplateConfig : TGetCustomTemplate
  afterCreate?: TAfterCreate
}
interface ITemplateInfo {
  css: CSSType
  typescript?: boolean
  compiler?: CompilerType
  template?: string
  templateSource?: string
  clone?: boolean
}

type TCustomTemplateInfo = Omit<ITemplateInfo & {
  isCustomTemplate?: boolean
  customTemplatePath?: string
}, 'template'>

export type TSetCustomTemplateConfig = (customTemplateConfig: TCustomTemplateInfo) => void

type TGetCustomTemplate = (cb: TSetCustomTemplateConfig) => Promise<void>
type TAfterCreate = (state: boolean) => void

const DEFAULT_TEMPLATE_INFO = {
  name: 'default',
  css: CSSType.None,
  typescript: false,
  compiler: CompilerType.Webpack5,
  framework: FrameworkType.React
}

export enum ConfigModificationState {
  Success,
  Fail,
  NeedLess
}

export type ModifyCallback = (state: ConfigModificationState) => void

export default class Page extends Creator {
  public rootPath: string
  public conf: IPageConf
  private modifyCustomTemplateConfig: TGetCustomTemplate
  private afterCreate: TAfterCreate | undefined
  private pageEntryPath: string

  constructor (args: IPageArgs) {
    super()
    this.rootPath = this._rootPath
    const { modifyCustomTemplateConfig, afterCreate, ...otherOptions } = args
    this.conf = Object.assign(
      {
        projectDir: '',
        projectName: '',
        template: '',
        description: '',
        pageDir: ''
      },
      otherOptions
    )

    this.conf.projectName = path.basename(this.conf.projectDir)
    this.modifyCustomTemplateConfig = modifyCustomTemplateConfig
    this.afterCreate = afterCreate
    this.processPageName()
  }

  processPageName () {
    const { pageName } = this.conf
    // todo 目前还没有对 subPkg 和 pageName 这两个字段做 格式验证或者处理
    const lastDirSplitSymbolIndex = pageName.lastIndexOf('/')
    if (lastDirSplitSymbolIndex !== -1) {
      this.conf.pageDir = pageName.substring(0, lastDirSplitSymbolIndex)
      this.conf.pageName = pageName.substring(lastDirSplitSymbolIndex + 1)
    }
  }

  getPkgPath () {
    const projectDir = this.conf.projectDir as string
    let pkgPath = path.join(projectDir, 'package.json')
    if (!fs.existsSync(pkgPath)) {
      // 适配 云开发 项目
      pkgPath = path.join(projectDir, 'client', 'package.json')
      if (!fs.existsSync(pkgPath)) {
        console.log(chalk.yellow('请在项目根目录下执行 taro create 命令!'))
        process.exit(0)
      }
    }
    return pkgPath
  }

  getPkgTemplateInfo () {
    const pkg = fs.readJSONSync(this.getPkgPath())
    const templateInfo = pkg.templateInfo || DEFAULT_TEMPLATE_INFO
    // set template name
    templateInfo.template = templateInfo.name
    delete templateInfo.name
    return templateInfo
  }

  setPageEntryPath (files: string[], handler) {
    const configFileName = files.find((filename) => /\.config\.(js|ts)$/.test(filename))
    if (!configFileName) return
    const getPageFn = handler[configFileName]
    const { setPageName = '', setSubPkgName = '' } = getPageFn?.(() => {}, this.conf) || {}
    if (this.conf.subPkg) {
      this.pageEntryPath = setSubPkgName.replace(/\.config\.(js|ts)$/, '')
    } else {
      this.pageEntryPath = setPageName.replace(/\.config\.(js|ts)$/, '')
    }
  }

  setCustomTemplateConfig (customTemplateConfig: TCustomTemplateInfo) {
    const pkgTemplateInfo = this.getPkgTemplateInfo()
    const { compiler, css, customTemplatePath, typescript } = customTemplateConfig
    const conf = {
      compiler: compiler || pkgTemplateInfo.compiler,
      css: css || pkgTemplateInfo.css,
      typescript: !isNil(typescript) ? typescript : pkgTemplateInfo.typescript,
      customTemplatePath,
      isCustomTemplate: true,
    }
    this.setTemplateConfig(conf)
  }

  setTemplateConfig (templateInfo: ITemplateInfo) {
    this.conf = Object.assign(this.conf, templateInfo)
  }

  async fetchTemplates () {
    const homedir = getUserHomeDir()
    let templateSource = DEFAULT_TEMPLATE_SRC
    if (!homedir) chalk.yellow('找不到用户根目录，使用默认模版源！')

    if (this.conf.templateSource) {
      templateSource = this.conf.templateSource
    } else {
      const taroConfigPath = path.join(homedir, TARO_CONFIG_FOLDER)
      const taroConfig = path.join(taroConfigPath, TARO_BASE_CONFIG)
      if (fs.existsSync(taroConfig)) {
        const config = await fs.readJSON(taroConfig)
        templateSource = config && config.templateSource ? config.templateSource : DEFAULT_TEMPLATE_SRC
      } else {
        await fs.createFile(taroConfig)
        await fs.writeJSON(taroConfig, { templateSource })
        templateSource = DEFAULT_TEMPLATE_SRC
      }
    }

    // 从模板源下载模板
    await fetchTemplate(templateSource, this.templatePath(''), this.conf.clone)
  }

  async create () {
    const date = new Date()
    this.conf.date = `${date.getFullYear()}-${date.getMonth() + 1}-${date.getDate()}`
    // apply 插件，由插件设置自定义模版 config
    await this.modifyCustomTemplateConfig(this.setCustomTemplateConfig.bind(this))
    if (!this.conf.isCustomTemplate) {
      const pkgTemplateInfo = this.getPkgTemplateInfo()
      this.setTemplateConfig(pkgTemplateInfo)
      if (!fs.existsSync(this.templatePath(this.conf.template))) {
        await this.fetchTemplates()
      }
    }
    this.write()
  }

  updateAppConfig () {
    const { parse, generate, traverse } = babelKit

    let modifyState: ConfigModificationState = ConfigModificationState.Fail
    const { subPkg, projectDir, typescript } = this.conf
    const [sourceString, pageString] = this.pageEntryPath.split('/src/')
    const appConfigPath = resolveScriptPath(path.join(projectDir, sourceString, 'src', 'app.config'))
    if (!fs.existsSync(appConfigPath)) {
      return console.log(
        `${chalk.red('x ')}${chalk.grey(`无法获取 ${appConfigPath} 配置文件，请手动到配置文件中补全新页面信息`)}`
      )
    }
    const configFileContent = fs.readFileSync(appConfigPath, 'utf-8')
    const ast = parse(configFileContent, {
      sourceType: 'module',
      plugins: typescript ? ['typescript'] : []
    })

    const callback = (state: ConfigModificationState) => {
      modifyState = state
    }

    traverse(ast as any, {
      ExportDefaultDeclaration (path) {
        modifyPagesOrSubPackages({
          path,
          fullPagePath: pageString,
          subPkgRootPath: subPkg,
          callback
        })
      },
    })

    switch (modifyState as ConfigModificationState) {
      case ConfigModificationState.Fail:
        console.log(`${chalk.red('x ')}${chalk.grey(`自动补全新页面信息失败， 请手动到 ${appConfigPath} 文件中补全新页面信息`)}`)
        break
      case ConfigModificationState.Success:
      {
        const newCode = generate(ast as any, { retainLines: true })
        fs.writeFileSync(appConfigPath, newCode.code)
        console.log(`${chalk.green('✔ ')}${chalk.grey(`新页面信息已在 ${appConfigPath} 文件中自动补全`)}`)
        break
      }
      case ConfigModificationState.NeedLess:
        console.log(`${chalk.green('✔ ')}${chalk.grey(`新页面信息已存在在 ${appConfigPath} 文件中，不需要补全`)}`)
        break
    }
  }

  write () {
    const { projectName, projectDir, template, pageName, isCustomTemplate, customTemplatePath, subPkg, pageDir } = this.conf as IPageConf
    let templatePath

    if (isCustomTemplate) {
      templatePath = customTemplatePath
    } else {
      templatePath = this.templatePath(template)
    }

    if (!fs.existsSync(templatePath)) return console.log(chalk.red(`创建页面错误：找不到模板${templatePath}`))

    // 引入模板编写者的自定义逻辑
    const handlerPath = path.join(templatePath, TEMPLATE_CREATOR)
    const basePageFiles = fs.existsSync(handlerPath) ? require(handlerPath).basePageFiles : []
    const files = Array.isArray(basePageFiles) ? basePageFiles : []
    const handler = fs.existsSync(handlerPath) ? require(handlerPath).handler : {}

    this.setPageEntryPath(files, handler)

    createPageBinding({
      pageDir,
      subPkg,
      projectDir,
      projectName,
      template,
      framework: this.conf.framework,
      css: this.conf.css || CSSType.None,
      typescript: this.conf.typescript,
      compiler: this.conf.compiler,
      templateRoot: getRootPath(),
      version: getPkgVersion(),
      date: this.conf.date,
      description: this.conf.description,
      pageName,
      isCustomTemplate,
      customTemplatePath,
      basePageFiles: files,
      period: PeriodType.CreatePage,
    }, handler).then(() => {
      console.log(`${chalk.green('✔ ')}${chalk.grey(`创建页面 ${this.conf.pageName} 成功！`)}`)
      this.updateAppConfig()
      this.afterCreate && this.afterCreate(true)
    }).catch(err => {
      console.log(err)
      this.afterCreate && this.afterCreate(false)
    })
  }
}

export type { Page as PageCreator }