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

function readFile(file) {
  return (file && fs.cat(file)?.toString()) || ''
}

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
  const PAGES_PREFIX = Object.keys(conf.pages).map(it => `pages/${it}/`)
  const INJECT_SCSS = readFile(conf.inject?.scss)
  const LEGACY_MODE = !!conf.legacy

  conf.inject = conf.inject || { scss: '' }

  let timeStart = Date.now()
  let template = fs.cat(join(process.cwd(), 'index.html')).toString()
  let list = {}

  fs.ls(SOURCE_DIR, true).forEach(path => {
    if (fs.isdir(path)) {
      return
    }

    let name = path.slice(SOURCE_DIR.length + 1)
    let it = {
      path,
      name,
      ext: parse(name).ext
    }
    if (it.ext !== '') {
      if (IS_MPA && it.name.startsWith('pages/')) {
        if (PAGES_PREFIX.some(it => it.startsWith(it.name))) {
          return (list[path] = it)
        } else {
          return
        }
      }

      if (it.path === conf.inject.scss) {
        return
      }

      list[path] = it
    }
  })

  let compileFiles = function (currentPage, page, files) {
    let options = {
      IS_MPA,
      currentPage,
      SOURCE_DIR,
      DEPLOY_PATH,
      INJECT_SCSS,
      LEGACY_MODE,
      isCustomElement: conf.isCustomElement || isCustomElement
    }

    for (let k in files) {
      let it = files[k]
      // 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, { ...options, IS_ENTRY: true })

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

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

      page === null && console.log('  解析 %s ...', it.name)

      let pageDir = IS_MPA && currentPage ? `pages/${currentPage}` : ''

      switch (it.ext) {
        case '.vue':
          {
            let code = compileVue(it.path, conf.imports, options)

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

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

            code = parseJs(code + '', conf.imports, options)

            Es.transform(code, { minify: true }).then(r => {
              fs.echo(r.code, join(dist, 'assets/', pageDir, it.name))
            })
          }
          break

        case '.scss':
        case '.css':
          {
            let target = join(
              dist,
              'assets/',
              it.name.replace(/\.scss$/, '.css')
            )
            if (it.ext === '.css') {
              fs.cp(it.path, target)
            } else {
              let code = compileScss(it.path)
              fs.echo(code, target)
            }
          }
          break

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

  // 优先处理静态目录, 之后的源码目录中, 以便如果有产生相同的文件名, 则覆盖静态目录中的文件
  if (fs.isdir(PUBLIC_DIR)) {
    console.log('\n正在处理静态资源 ...')
    fs.ls(PUBLIC_DIR, true).forEach(it => {
      let ext = parse(it).ext

      if (ext === '') {
        return
      }

      if (fs.isfile(it)) {
        let name = it.slice(PUBLIC_DIR.length + 1)
        console.log('  复制 %s ...', name)
        fs.cp(it, join(dist, name))
      }
    })
  }

  for (let currentPage in conf.pages) {
    let page = conf.pages[currentPage]
    let dir = dirname(page.entry)
    let files = list
    if (IS_MPA) {
      files = {}
      fs.ls(dir, true).forEach(path => {
        if (fs.isdir(path)) {
          return
        }

        let name = path.slice(dir.length + 1)
        let ext = parse(name).ext

        if (ext === '') {
          return
        }

        delete list[path]
        files[path] = { name, path, ext }
      })
    }
    console.log('正在生成 %s ...', `${currentPage}.html`)
    compileFiles(currentPage, page, files)
  }

  if (IS_MPA) {
    console.log('\n正在解析公共依赖 ...')
    compileFiles('', null, list)
  }

  process.on('exit', _ => {
    console.log('\n页面处理完成, 耗时 %ss\n', (Date.now() - timeStart) / 1000)
  })
}