import * as path from 'path'
import fse from 'fs-extra'
import typescript from '@rollup/plugin-typescript'
import resolve from '@rollup/plugin-node-resolve'
import babel from '@rollup/plugin-babel'
import { terser } from 'rollup-plugin-terser'
import replace from '@rollup/plugin-replace'
const version = require('./package.json').version
const cwd = process.cwd()
const isPro = process.env.NODE_ENV === 'production'

// 清空目标目录
fse.emptyDirSync(path.join(cwd, 'lib'))
fse.emptyDirSync(path.join(cwd, 'polyfill'))

function getCommonPlugins (isBundlerESMBuild) {
  // 通用插件
  return [
    resolve(),
    babel({
      babelHelpers: 'runtime',
      presets: [
        [
          '@babel/preset-env',
          {
            modules: false
          }
        ]
      ],
      plugins: [
        '@babel/plugin-transform-runtime'
      ]
    }),
    replace({
      preventAssignment: true,
      __MICRO_APP_VERSION__: version,
      __TEST__: 'false',
      __DEV__: isBundlerESMBuild
        ? '(process.env.NODE_ENV !== \'production\')'
        : JSON.stringify(!isPro),
    })
  ]
}

function getBaseConfig (isBundlerESMBuild) {
  // 通用配置
  return {
    input: path.join(__dirname, 'src/index.ts'),
    external: [
      /@babel\/runtime/,
    ].filter(Boolean),
    plugins: getCommonPlugins(isBundlerESMBuild).concat([
      typescript({
        tsconfig: path.join(__dirname, 'tsconfig.json'),
        // typescript: require('typescript'),
      }),
    ])
  }
}

const esConfig = Object.assign({}, getBaseConfig(true), {
  output: [
    {
      file: path.join(__dirname, 'lib/index.esm.js'),
      format: 'es',
      sourcemap: true
    }
  ],
})

const baseConfigForNormal = getBaseConfig()
const cjsConfig = Object.assign({}, baseConfigForNormal, {
  output: [
    {
      file: path.join(__dirname, 'lib/index.min.js'),
      format: 'cjs',
      sourcemap: true,
      exports: 'named'
    },
    {
      file: path.join(__dirname, 'lib/index.umd.js'),
      format: 'umd',
      sourcemap: true,
      exports: 'named',
      name: 'microApp',
    }
  ],
  plugins: baseConfigForNormal.plugins.concat([
    terser({
      ecma: 5,
    }),
  ]),
})

// polyfill配置
const polyfillConfig = []
const polyfillFiles = fse.readdirSync('./src/polyfill')
polyfillFiles && polyfillFiles.forEach((file) => {
  if (/\.ts$/.test(file)) {
    const config = {
      input: path.join(__dirname, `src/polyfill/${file}`),
      output: {
        file: path.join(__dirname, `polyfill/${file.replace(/\.ts$/, '.js')}`),
        format: 'es',
        sourcemap: true,
      },
      plugins: getCommonPlugins().concat([
        typescript(),
      ])
    }
    if (/jsx-custom-event/.test(file)) {
      config.external = [/react/]
    }
    polyfillConfig.push(config)
  }
})

const baseConfigList = [esConfig]
if (isPro) {
  baseConfigList.push(cjsConfig)
}

export default baseConfigList.concat(polyfillConfig)