const path = require('path')
const hash = require('hash-sum')
const parser = require('@babel/parser')

const {
  parseComponent,
  compile,
  compileToFunctions,
  ssrCompile,
  ssrCompileToFunctions
} = require('@dcloudio/vue-cli-plugin-uni/packages/vue-template-compiler')

const platforms = require('./platforms')
const traverseScript = require('./script/traverse')
const generateScript = require('./script/generate')
const traverseTemplate = require('./template/traverse')
const generateTemplate = require('./template/generate')

const compilerModule = require('./module')

const compilerAlipayModule = require('./module-alipay')
const compilerToutiaoModule = require('./module-toutiao')

const generateCodeFrame = require('./codeframe')

const {
  isComponent,
  isUnaryTag
} = require('./util')

const {
  module: autoComponentsModule,
  compileTemplate
} = require('./auto-components')

const isWin = /^win/.test(process.platform)

const normalizePath = path => (isWin ? path.replace(/\\/g, '/') : path)

module.exports = {
  compile (source, options = {}) {
    if ( // 启用摇树优化后,需要过滤内置组件
      !options.autoComponentResourcePath ||
      options.autoComponentResourcePath.indexOf('@dcloudio/uni-h5/src') === -1
    ) {
      (options.modules || (options.modules = [])).push(autoComponentsModule)
    }

    // 非h5平台，transformAssetUrls
    if (process.env.UNI_PLATFORM !== 'h5') {
      (options.modules || (options.modules = [])).push(require('./asset-url'))
    }

    options.isUnaryTag = isUnaryTag
    // 将 autoComponents 挂在 isUnaryTag 上边
    options.isUnaryTag.autoComponents = new Set()

    options.preserveWhitespace = false
    if (options.service) {
      (options.modules || (options.modules = [])).push(require('./app/service'))
      options.optimize = false // 启用 staticRenderFns
      // domProps => attrs
      options.mustUseProp = () => false
      options.isReservedTag = (tagName) => !isComponent(tagName) // 非组件均为内置
      options.getTagNamespace = () => false

      try {
        return compileTemplate(source, options, compile)
      } catch (e) {
        console.error(source)
        throw e
      }
    } else if (options.view) {
      (options.modules || (options.modules = [])).push(require('./app/view'))
      options.optimize = false // 暂不启用 staticRenderFns
      options.isUnaryTag = isUnaryTag
      options.isReservedTag = (tagName) => false // 均为组件
      try {
        return compileTemplate(source, options, compile)
      } catch (e) {
        console.error(source)
        throw e
      }
    } else if (options.quickapp) {
      // 后续改版，应统一由具体包实现
      (options.modules || (options.modules = [])).push(require('@dcloudio/uni-quickapp/lib/compiler-module'))
    }

    if (!options.mp) { // h5,quickapp
      return compileTemplate(source, options, compile)
    }

    (options.modules || (options.modules = [])).push(compilerModule)

    if (options.mp.platform === 'mp-alipay') {
      options.modules.push(compilerAlipayModule)
    } else if (options.mp.platform === 'mp-toutiao') {
      options.modules.push(compilerToutiaoModule)
    }

    const res = compileTemplate(source, Object.assign(options, {
      optimize: false
    }), compile)

    options.mp.platform = platforms[options.mp.platform]

    options.mp.scopeId = options.scopeId

    options.mp.resourcePath = options.resourcePath
    if (options.resourcePath) {
      options.mp.hashId = hash(options.resourcePath)
    } else {
      options.mp.hashId = ''
    }

    options.mp.globalUsingComponents = options.globalUsingComponents || Object.create(null)

    options.mp.filterModules = Object.keys(options.filterModules || {})

    // (可用的原生微信小程序组件，global+scoped)
    options.mp.wxComponents = options.wxComponents || Object.create(null)

    const state = {
      ast: {},
      script: '',
      template: '',
      errors: new Set(),
      tips: new Set(),
      options: options.mp
    }
    // console.log(`function render(){${res.render}}`)
    const ast = parser.parse(`function render(){${res.render}}`)
    let template = ''

    try {
      res.render = generateScript(traverseScript(ast, state), state)
      template = generateTemplate(traverseTemplate(ast, state), state)
    } catch (e) {
      console.error(e)
      throw new Error('Compile failed at ' + options.resourcePath.replace(
        path.extname(options.resourcePath),
        '.vue'
      ))
    }

    res.specialMethods = state.options.specialMethods || new Set()
    delete state.options.specialMethods

    res.files = state.files || {}
    delete state.files

    // resolve scoped slots
    res.generic = state.generic || []
    delete state.generic

    // define scoped slots
    res.componentGenerics = state.componentGenerics || {}
    delete state.componentGenerics

    state.errors.forEach(msg => {
      res.errors.push({
        msg
      })
    })

    const resourcePath = options.resourcePath.replace(path.extname(options.resourcePath), '')

    state.tips.forEach(msg => {
      console.log(`提示：${msg}
at ${resourcePath}.vue:1`)
    })

    /**
     * TODO
     * 方案0.最佳方案是在 loader 中直接 emitFile，但目前 vue template-loader 不好介入,自定义的 compiler 结果又无法顺利返回给 loader
     * 方案1.通过 loader 传递 emitFile 来提交生成 wxml,需要一个 template loader 来给自定义 compier 增加 emitFile
     * 方案2.缓存 wxml 内容，由 plugin 生成 assets 来提交生成 wxml
     * ...暂时使用方案1
     */
    if (options.emitFile) {
      // cache
      if (process.env.UNI_USING_CACHE) {
        const oldEmitFile = options.emitFile
        process.UNI_CACHE_TEMPLATES = {}
        options.emitFile = function emitFile (name, content) {
          const absolutePath = path.resolve(process.env.UNI_OUTPUT_DIR, name)
          process.UNI_CACHE_TEMPLATES[absolutePath] = content
          oldEmitFile(name, content)
        }
      }

      if (options.updateSpecialMethods) {
        options.updateSpecialMethods(resourcePath, [...res.specialMethods])
      }
      const filterTemplate = []
      options.mp.filterModules.forEach(name => {
        const filterModule = options.filterModules[name]
        if (filterModule.type !== 'renderjs' && filterModule.attrs.lang !== 'renderjs') {
          if (
            filterModule.attrs &&
            filterModule.attrs.src &&
            filterModule.attrs.src.indexOf('@/') === 0
          ) {
            const src = filterModule.attrs.src
            filterModule.attrs.src = normalizePath(path.relative(
              path.dirname(resourcePath), src.replace('@/', '')
            ))
          }
          filterTemplate.push(
            options.mp.platform.createFilterTag(
              options.filterTagName,
              filterModule
            )
          )
        }
      })

      if (filterTemplate.length) {
        template = filterTemplate.join('\n') + '\n' + template
      }

      if (
        process.UNI_ENTRY[resourcePath] &&
        process.env.UNI_PLATFORM !== 'app-plus' &&
        process.env.UNI_PLATFORM !== 'h5'
      ) {
        // 检查是否启用 shadow
        let colorType = false
        const pageJsonStr = options.getJsonFile(resourcePath)
        if (pageJsonStr) {
          try {
            const windowJson = JSON.parse(pageJsonStr)
            if (process.env.UNI_PLATFORM === 'mp-alipay') {
              colorType = windowJson.allowsBounceVertical === 'NO' &&
                windowJson.navigationBarShadow &&
                windowJson.navigationBarShadow.colorType
            } else {
              colorType = windowJson.disableScroll &&
                windowJson.navigationBarShadow &&
                windowJson.navigationBarShadow.colorType
            }
          } catch (e) {}
        }
        if (colorType) {
          template = options.getShadowTemplate(colorType) + template
        }
      }

      options.emitFile(options.resourcePath, template)
      if (res.files) {
        Object.keys(res.files).forEach(name => {
          options.emitFile(name, res.files[name])
        })
      }

      if (state.options.usingGlobalComponents) {
        options.updateUsingGlobalComponents(
          resourcePath,
          state.options.usingGlobalComponents
        )
      }

      if (
        res.generic &&
        res.generic.length &&
        options.updateGenericComponents
      ) {
        options.updateGenericComponents(
          resourcePath,
          res.generic
        )
      }
      if (
        res.componentGenerics &&
        Object.keys(res.componentGenerics).length &&
        options.updateComponentGenerics
      ) {
        options.updateComponentGenerics(
          resourcePath,
          res.componentGenerics
        )
      }
    } else {
      res.template = template
    }
    return res
  },
  parseComponent,
  compileToFunctions,
  ssrCompile,
  ssrCompileToFunctions,
  generateCodeFrame
}