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

import fs from 'iofs'
import scss from '@bytedo/sass'
import Es from 'esbuild'

import { compile } from '@vue/compiler-dom'
import { red, cyan, blue } from 'kolorist'

import {
  JS_EXP,
  STYLE_EXP,
  HTML_EXP,
  CSS_SHEET_EXP,
  V_DEEP,
  PERCENT_EXP,
  SHEETS_DEF,
  LEGACY_POLYFILL
} from './constants.js'
import { createHmrScript, md5, uuid, urlJoin } from './utils.js'

const OPTIONS = {
  style: 'compressed'
}

function minify(code) {
  return Es.transformSync(code, { minify: true }).code.trim()
}

// 处理css中的 :deep()
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}`
  }
}

// 处理style中的scoped属性
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, LEGACY_MODE, define } = {},
  filename,
  linePatch = 1
) {
  let fixedStyle = ''
  let ASSETS_DIR = '/@/'
  let isBuild = process.env.NODE_ENV === 'production'

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

  try {
    code = Es.transformSync(code).code || ''
  } catch (e) {
    let err = e.errors.pop()
    let lines = code.split('\n')

    console.log('%s: %s', red('Uncaught SyntaxError'), red(err.text))
    // 将上下文几行都打印出来
    for (let i = err.location.line - 3; i <= err.location.line + 1; i++) {
      console.log(
        '  @ line %d: %s',
        i + linePatch,
        err.location.line === i + 1 ? red(lines[i]) : lines[i]
      )
    }
    console.log(
      '  @ %s:%d:%d',
      blue(filename),
      err.location.line + linePatch - 1,
      err.location.column
    )
  }

  code = code
    .replace(/\r\n/g, '\n')
    .replace(/process\.env\.NODE_ENV/g, `'${process.env.NODE_ENV}'`)
    .replace(
      /(import|export) ([^'"]*?) from (["'])(.*?)\3/g,
      function (m, t, 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('.mjs') &&
            !name.endsWith('.vue')
          ) {
            if (name.includes('components')) {
              name += '.vue'
            } else {
              name += '.js'
            }
          }
        }
        if (isBuild) {
          name = name.replace(/\.vue$/, '.js')
        }
        if (alias.trim() === '*') {
          return `${t} ${alias} from '${name}'`
        }
        let _alias = alias
        let _import = ''
        if (alias.includes('* as')) {
          _alias = ' default ' + alias.replace('* as', '').trim()
        }

        _import = `import ${alias} from '${name}'`
        _import += t === 'export' ? `\nexport ${_alias}` : ''

        return _import
      }
    )
    .replace(/import\((['"])(.*?)\1\)/g, function (m, q, name) {
      if (isBuild) {
        name = name.replace(/\.vue$/, '.js')
      }
      if (name.startsWith('@/')) {
        name = name.replace('@/', urlJoin(DEPLOY_PATH, ASSETS_DIR))
      }
      if (name.endsWith('.json')) {
        name += '.js'
      }
      return `import('${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')
        }
        // 修正那反人类的windows路径
        let _name = name.replace(/\\/g, '/').replace('@/', '')
        let tmp = `style_${uuid()}`

        // 因为esm语法的变更, 原先的 import xx from xx assets {type: css} 变为了 with
        // 而这个语法的变化, 构建工具无法做版本判断, 故, 统一降级到fetch()加载
        if (LEGACY_MODE) {
          fixedStyle +=
            `{\n` +
            `  let stylesheet = document.createElement('style');\n` +
            `  stylesheet.setAttribute('name', '${_name}');\n` +
            `  stylesheet.textContent = ${tmp};\n` +
            `  document.head.appendChild(stylesheet);\n` +
            `}\n`

          return `let ${tmp};\n!(async function(){\n  ${tmp} = await __fite_import('${name}', import.meta.url);\n})()`
        } else {
          // CSSStyleSheet.replaceSync 需要FF v101, Safari 16.4才支持
          fixedStyle +=
            `{\n` +
            `  let stylesheet = new CSSStyleSheet();\n` +
            `  stylesheet.path = '${_name}';\n` +
            `  stylesheet.replaceSync(${tmp} );\n` +
            `  __sheets__.push(stylesheet);\n` +
            `  document.adoptedStyleSheets = __sheets__;\n` +
            `}\n`

          return `const ${tmp} = await __fite_import('${name}', import.meta.url)`
        }
      } 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('.mjs') &&
            !name.endsWith('.vue')
          ) {
            name += '.js'
          }
        }

        return `import '${name}'`
      }
    })

  for (let key in define) {
    code = code.replaceAll(key, define[key])
  }

  if (fixedStyle) {
    code += '\n\n' + (IS_ENTRY ? SHEETS_DEF : '') + fixedStyle

    if (IS_ENTRY && !LEGACY_MODE) {
      code += '\ndocument.adoptedStyleSheets = __sheets__'
    }
  }

  return code
}

/**
 * 将vue转为js
 * @param file <String> 文件路径
 * @return <String> 返回转换后的js代码
 */
export async function compileVue(file, imports, options = {}) {
  // 修正那反人类的windows路径
  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 { isCustomElement } = options
  let output = '',
    scoped = false

  let js = code.match(JS_EXP)
  let scss = [...code.matchAll(STYLE_EXP)]
  let html = code.match(HTML_EXP) || ['', '']
  let linePatch = code.slice(0, js?.index || 0).split('\n').length // js起始行数修正

  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(' ')

  for (let fn of options.plugin) {
    scss = await fn('css', scss)
  }

  js = js ? js[1] : 'export default {}'

  try {
    html = compile(html[1], {
      mode: 'module',
      prefixIdentifiers: true,
      hoistStatic: true,
      cacheHandlers: true,
      scopeId: scoped ? scopeId : void 0,
      sourceMap: false,
      isCustomElement
    }).code.replace('export function render', 'function render')
  } catch (err) {
    let lines = html[1].split('\n')
    let line = lines[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, linePatch).replace(
    'export default {',
    `\n${
      options.LEGACY_MODE ? '' : SHEETS_DEF
    }${html}\n\nconst __sfc__ = {\n  render,\n`
  )

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

    if (options.LEGACY_MODE) {
      output += `
{
  let stylesheet = document.createElement('style')
  stylesheet.setAttribute('name', '${filename}')
  stylesheet.textContent = \`${scss}\`
  document.head.appendChild(stylesheet)
}
`
    } else {
      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, LEGACY_MODE }) {
  return html
    .replace(/\r\n/g, '\n')
    .replace(
      '</head>',
      `${
        process.env.NODE_ENV === 'development'
          ? `  <script>${minify(createHmrScript(LEGACY_MODE))}</script>\n`
          : `  <script>${minify(LEGACY_POLYFILL)}</script>\n`
      }</head>`
    )
    .replace('{{title}}', page.title || '')
    .replace('{{keywords}}', page.keywords || '')
    .replace('{{description}}', page.description || '')
    .replace('{{importmap}}', JSON.stringify({ imports }))
    .replace(
      '<script src="main.js"></script>',
      `<script type="module">\n${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}'`)
}