import fs from 'iofs'
import { join, resolve, dirname, parse } from 'path'
import Es from 'esbuild'
import { compileScss, parseJs, compileVue, parseHtml } from './compile-vue.js'

const noc = Buffer.from('')

export default function compile(root = '', dist = '', conf = {}) {
  //
  const SOURCE_DIR = join(root, 'src')
  const PUBLIC_DIR = join(root, 'public')
  const DEPLOY_PATH = conf.base || '' // 部署目录, 默认是根目录部署
  const IS_MPA = Object.keys(conf.pages).length > 1

  let timeStart = Date.now()
  let template = fs.cat(join(process.env.PWD, 'index.html')).toString()

  let list = fs
    .ls(SOURCE_DIR, true)
    .map(it => ({
      name: it.slice(SOURCE_DIR.length + 1),
      path: it,
      ext: parse(it).ext
    }))
    .filter(it => fs.isfile(it.path))

  let compileFiles = function (currentPage, page, files) {
    for (let it of files) {
      // 入口文件, 特殊处理
      if (page && it.path === page.entry) {
        let entry = fs.cat(page.entry).toString()

        entry = parseJs(
          entry,
          conf.imports,
          { IS_MPA, currentPage, IS_ENTRY: true, DEPLOY_PATH },
          true
        )

        let code = parseHtml(
          template,
          { page, imports: conf.imports, entry },
          true
        )

        fs.echo(code, join(dist, `${currentPage}.html`))
        continue
      }

      console.log('  解析 %s ...', it.name)

      switch (it.ext) {
        case '.vue':
          {
            let code = compileVue(
              it.path,
              conf.imports,
              { IS_MPA, currentPage, SOURCE_DIR, DEPLOY_PATH },
              true
            )

            Es.transform(code, { minify: true }).then(r => {
              fs.echo(
                r.code,
                join(
                  dist,
                  'assets/js/',
                  IS_MPA ? currentPage : '',
                  it.name.replace(/\.vue$/, '.js')
                )
              )
            })
          }
          break

        case '.js':
          {
            let code = fs.cat(it.path)

            code = parseJs(
              code + '',
              conf.imports,
              { IS_MPA, currentPage, DEPLOY_PATH },
              true
            )
            Es.transform(code, { minify: true }).then(r => {
              fs.echo(
                r.code,
                join(dist, 'assets/js/', IS_MPA ? currentPage : '', it.name)
              )
            })
          }
          break

        case '.scss':
        case '.css':
          {
            let code = compileScss(it.path)
            if (!it.name.startsWith('assets')) {
              it.name = 'assets/js/' + it.name
            }
            fs.echo(code, join(dist, it.name.replace(/\.scss$/, '.css')))
          }
          break

        default:
          fs.cp(it.path, join(dist, it.name))
          break
      }
    }
  }

  for (let currentPage in conf.pages) {
    let page = conf.pages[currentPage]
    let dir = dirname(page.entry)

    let files = []

    fs.ls(dir, true).forEach(it => {
      if (fs.isdir(it)) {
        return
      }
      let idx = list.findIndex(_ => _.path === it)
      list.splice(idx, 1)
      files.push({
        name: it.slice(dir.length + 1),
        path: it,
        ext: parse(it).ext
      })
    })

    console.log('正在生成 %s ...', `${currentPage}.html`)
    compileFiles(currentPage, page, files)
  }

  console.log('正在解析公共依赖 ...')
  compileFiles('', null, list)

  //
  if (fs.isdir(PUBLIC_DIR)) {
    console.log('正在处理静态资源 ...')
    fs.ls(PUBLIC_DIR, true).forEach(it => {
      if (fs.isfile(it)) {
        let name = it.slice(PUBLIC_DIR.length + 1)
        console.log('  正在复制 %s ...', name)
        fs.cp(it, join(dist, name))
      }
    })
  }

  console.log('\n页面处理完成, 耗时 %ss\n', (Date.now() - timeStart) / 1000)
}