/**
 * {}
 * @author yutent<yutent.io@gmail.com>
 * @date 2022/09/06 14:43:01
 */

import fs from 'iofs'
import scss from '@bytedo/sass'
import { createHash, randomUUID } from 'crypto'
import Es from 'esbuild'
import { join } from 'path'
import { compile } from '@vue/compiler-dom'
import { red, cyan, blue } from 'kolorist'

function uuid() {
  return randomUUID().slice(-8)
}

import {
  JS_EXP,
  STYLE_EXP,
  HTML_EXP,
  CSS_SHEET_EXP,
  HMR_SCRIPT,
  V_DEEP,
  PERCENT_EXP
} from './constants.js'

const OPTIONS = {
  style: 'compressed'
}

// 修正路径合并 避免在windows下被转义
function urlJoin(...args) {
  return join(...args).replace(/\\/g, '/')
}

function md5(str = '') {
  let sum = createHash('md5')
  sum.update(str, 'utf8')
  return sum.digest('hex').slice(0, 8)
}

function parseVDeep(curr, val, scoped) {
  let res = V_DEEP.exec(curr)
  if (res) {
    scoped && (val = val.replace(/\[data\-[^\]]+\]/g, ''))
    return `${res[1] + res[2]} ${val}`
  } else {
    return `${curr} ${val}`
  }
}

function scopeCss(css = '', hash) {
  return css.replace(CSS_SHEET_EXP, (m, selector) => {
    if (!selector.startsWith('@')) {
      selector = selector.split(',')

      selector = selector
        .map(s => {
          // 针对 @keyframe的处理
          if (s === 'from' || s === 'to' || PERCENT_EXP.test(s)) {
            return s
          }
          let tmp = s.split(' ')
          let output = ''
          let last
          let scoped = false

          while ((last = tmp.pop())) {
            if (scoped) {
              if (last.startsWith(':')) {
                output = parseVDeep(last, output, true)
              } else {
                output = `${last} ${output}`
              }
            } else {
              if (last.includes(':')) {
                if (last.startsWith(':')) {
                  output = parseVDeep(last, output)
                } else {
                  scoped = true
                  last = last.replace(':', `[data-${hash}]:`)
                  output = `${last} ${output}`
                }
              } else {
                scoped = true
                output = `${last}[data-${hash}] ${output}`
              }
            }
          }

          return output
        })
        .join(', ')
    }
    return selector + '{'
  })
}

/**
 * 编译scss为css
 * @param file <String> 文件路径或scss代码
 * @param inject <String> 要注入的scss代码
 */
export function compileScss(file, inject = '') {
  try {
    if (fs.isfile(file)) {
      return scss.compile(file, OPTIONS).css.trim()
    } else {
      return scss.compileString(inject + file, OPTIONS).css.trim()
    }
  } catch (err) {
    console.error(err)
  }
}

/**
 * 解析js
 * 主要是处理js的依赖引用
 * @param code <String> js代码
 */
export function parseJs(
  code = '',
  imports,
  { IS_MPA, currentPage, IS_ENTRY, DEPLOY_PATH } = {},
  filename
) {
  let fixedStyle = '\n\n'
  let ASSETS_DIR = '/@/'
  let isBuild = process.env.NODE_ENV === 'production'

  if (isBuild) {
    ASSETS_DIR = '/assets/'
  }

  if (IS_ENTRY) {
    fixedStyle += 'const __sheets__ = [...document.adoptedStyleSheets];\n'
  }

  try {
    code = Es.transformSync(code).code || ''
  } catch (e) {
    let err = e.errors.pop()
    console.log('%s: %s', red('Uncaught SyntaxError'), err.text)
    console.log(
      '  @ line %d: %s',
      err.location.line,
      cyan(err.location.lineText)
    )
    console.log(
      '  @ %s:%d:%d',
      blue(filename),
      err.location.line,
      err.location.column
    )
  }

  return (
    code
      .replace(/\r\n/g, '\n')
      .replace(/process\.env\.NODE_ENV/g, `'${process.env.NODE_ENV}'`)
      .replace(
        /import ([\w\W]*?) from (["'])(.*?)\2/g,
        function (m, alias, q, name) {
          if (name.startsWith('@/')) {
            name = name.replace('@/', urlJoin(DEPLOY_PATH, ASSETS_DIR))
          }

          if (!imports[name]) {
            if (name.startsWith('./') || name.startsWith('../')) {
              if (IS_ENTRY) {
                if (IS_MPA) {
                  name = `pages/${currentPage}/` + name
                }
                name = urlJoin(DEPLOY_PATH, ASSETS_DIR, name)
              }
            } else if (
              name.startsWith('/') &&
              !name.startsWith('//') &&
              !name.startsWith(urlJoin(DEPLOY_PATH, ASSETS_DIR))
            ) {
              name = name.replace(/^\//, urlJoin(DEPLOY_PATH, ASSETS_DIR))
            }

            if (!name.endsWith('.js') && !name.endsWith('.vue')) {
              if (name.includes('components')) {
                name += '.vue'
              } else {
                name += '.js'
              }
            }
          }
          if (isBuild) {
            name = name.replace(/\.vue$/, '.js')
          }
          return `import ${alias} from '${name}'`
        }
      )
      .replace(/import\((['"])(.*?)\1\)/g, function (m, q, name) {
        if (isBuild) {
          name = name.replace(/\.vue$/, '.js')
        }
        if (name.startsWith('@/')) {
          name = name.replace('@/', urlJoin(DEPLOY_PATH, ASSETS_DIR))
        }
        return `import('${name}')`
      })
      .replace(/import (["'])(.*?)\1/g, function (m, q, name) {
        if (name.endsWith('.css') || name.endsWith('.scss')) {
          if (name.startsWith('@/')) {
            name = name.replace('@/', urlJoin(DEPLOY_PATH, ASSETS_DIR))
          }

          if (isBuild) {
            name = name.replace(/\.scss/, '.css')
          }
          let tmp = `style_${uuid()}`
          fixedStyle += `__sheets__.push(${tmp})\n`

          // 修正那反人类的windows路径
          return `import ${tmp} from '${name}' assert { type: 'css' }\n${tmp}.path = '${name.replace(
            /\\/g,
            '/'
          )}'`
        } else {
          if (name.startsWith('@/')) {
            name = name.replace('@/', urlJoin(DEPLOY_PATH, ASSETS_DIR))
          }
          //
          if (!imports[name]) {
            if (name.startsWith('./') || name.startsWith('../')) {
              if (IS_ENTRY) {
                if (IS_MPA) {
                  name = `${currentPage}/` + name
                }
                name = urlJoin(DEPLOY_PATH, ASSETS_DIR, name)
              }
            } else if (
              name.startsWith('/') &&
              !name.startsWith('//') &&
              !name.startsWith(urlJoin(DEPLOY_PATH, ASSETS_DIR))
            ) {
              name = name.replace(/^\//, urlJoin(DEPLOY_PATH, ASSETS_DIR))
            }

            if (!name.endsWith('.js') && !name.endsWith('.vue')) {
              name += '.js'
            }
          }

          return `import '${name}'`
        }
      }) +
    fixedStyle +
    (IS_ENTRY ? '\ndocument.adoptedStyleSheets = __sheets__' : '')
  )
}

/**
 * 将vue转为js
 * @param file <String> 文件路径
 * @return <String> 返回转换后的js代码
 */
export function compileVue(file, imports, options = {}) {
  let filename = file.slice(options.SOURCE_DIR.length).replace(/\\/g, '/')
  let code = (fs.cat(file) || '').toString().replace(/\r\n/g, '\n')
  let CACHE = options.CACHE || {}
  let output = '',
    scoped = false

  let js = code.match(JS_EXP)
  let scss = [...code.matchAll(STYLE_EXP)]
  let html = code.match(HTML_EXP) || ['', '']

  let hash = md5(file)
  let scopeId = 'data-' + hash

  scss = scss
    .map(it => {
      let css
      if (it.length > 2) {
        css = compileScss(it[2], options.INJECT_SCSS)

        if (it[1].includes('scoped')) {
          scoped = true
          css = scopeCss(css, hash)
        }
      } else {
        css = compileScss(it[1], options.INJECT_SCSS)
      }
      return css
    })
    .join(' ')

  js = js ? js[1] : ''

  try {
    html = compile(html[1], {
      mode: 'module',
      prefixIdentifiers: true,
      hoistStatic: true,
      cacheHandlers: true,
      scopeId: scoped ? scopeId : void 0,
      sourceMap: false,
      isCustomElement: tag => tag.startsWith('wc-')
    }).code.replace('export function render', 'function render')
  } catch (err) {
    let tmp = html[1].split('\n')
    let line = tmp[err.loc.start.line - 1]

    console.log('%s: %s', red('SyntaxError'), red(err.message))
    console.log(
      '  @ %s%s%s',
      line.slice(0, err.loc.start.column - 1),
      red(err.loc.source),
      line.slice(err.loc.end.column - 1)
    )
    console.log(
      '  @ (%s:%d:%d)\n',
      file,
      err.loc.start.line,
      err.loc.start.column
    )
    html = `
import { openBlock as _openBlock, createElementBlock as _createElementBlock } from "vue"

function render(_ctx, _cache) {
  return (_openBlock(), _createElementBlock("div", null, "SyntaxError: ${err.message}"))
}
    `
  }

  html = html
    .replace(/import .* from "vue"/, str => {
      output += str + '\n'
      return ''
    })
    .trim()

  if (CACHE[file]) {
    CACHE[file] = {
      changed: CACHE[file].js !== js || CACHE[file].html !== html,
      js,
      html
    }
  } else {
    CACHE[file] = { changed: false, js, html }
  }

  output += parseJs(js, imports, options, file).replace(
    'export default {',
    `\nconst __sheets__ = [...document.adoptedStyleSheets]\n${html}\n\nconst __sfc__ = {\n  render,\n`
  )

  if (scss) {
    CACHE[file].css = scss

    // 修正那反人类的windows路径
    output += `
{
  let stylesheet = new CSSStyleSheet()
  stylesheet.path = '${filename}'
  stylesheet.replaceSync(\`${scss}\`)
  __sheets__.push(stylesheet)
}
document.adoptedStyleSheets = __sheets__
`
  }
  if (scoped) {
    output += `__sfc__.__scopeId = '${scopeId}'\n`
  }
  output += `__sfc__.__file = '${filename}'\nexport default __sfc__`

  return output
}

/**
 * 解析模板html
 */
export function parseHtml(html, { page, imports, entry }) {
  return html
    .replace(/\r\n/g, '\n')
    .replace(
      '</head>',
      `${
        process.env.NODE_ENV === 'development'
          ? `  <script>${
              Es.transformSync(HMR_SCRIPT, { minify: true }).code.trim()
            }</script>\n`
          : ''
      }</head>`
    )
    .replace('{{title}}', page.title || '')
    .replace('{{keywords}}', page.keywords || '')
    .replace('{{description}}', page.description || '')
    .replace('{{importmap}}', JSON.stringify({ imports }))
    .replace(
      '<script src="main.js"></script>',
      `<script type="module">\n${entry}\n</script>`
    )
    .replace(/\{\{#if(.*?)\}\}([\w\W]*?)\{\{#\/if\}\}/g, (m, c, code) => {
      let res = Function('return ' + c)()
      return res ? code : ''
    })
    .replace(/process\.env\.NODE_ENV/g, `'${process.env.NODE_ENV}'`)
}