import path from 'node:path'
import { mkdirSync, writeFileSync } from 'node:fs'
import { defineConfig } from '@tarojs/cli'
import { outputDirectory, readPublicConfig, resolveEnvironment } from './environments'
import packageJson from '../package.json'
import project from '../project.config.json'

export default defineConfig<'vite'>(() => {
  const environment = resolveEnvironment(process.env.APP_ENV)
  const platform = process.env.TARO_ENV ?? 'weapp'
  // Taro loads .env files for the explicit --mode before evaluating this config.
  const publicConfig = readPublicConfig(process.env)
  const metadataDirectory = path.resolve(__dirname, '../.cache/build', platform, environment.name)
  const metadata = {
    environment: environment.name, label: publicConfig.label, platform,
    version: packageJson.version, dataSource: environment.dataSource, builtAt: new Date().toISOString(),
  }
  mkdirSync(metadataDirectory, { recursive: true })
  writeFileSync(path.join(metadataDirectory, 'build-info.json'), `${JSON.stringify(metadata, null, 2)}\n`)
  if (platform === 'weapp') {
    const weappProject = {
      ...project, miniprogramRoot: './', appid: process.env.TARO_APP_ID || project.appid,
      projectname: `math.miniapp-${environment.name}`,
    }
    writeFileSync(path.join(metadataDirectory, 'project.config.json'), `${JSON.stringify(weappProject, null, 2)}\n`)
  }

  return {
    projectName: `math.miniapp-${environment.name}`,
    date: '2026-10-26',
    designWidth: 750,
    deviceRatio: { 375: 2, 640: 1.17, 750: 1, 828: 0.905 },
    sourceRoot: 'src',
    outputRoot: outputDirectory(platform),
    framework: 'react',
    compiler: 'vite',
    alias: { '@': path.resolve(__dirname, '../src') },
    defineConstants: {
      __APP_ENV__: JSON.stringify(environment.name),
      __APP_ENV_LABEL__: JSON.stringify(publicConfig.label),
      __APP_VERSION__: JSON.stringify(packageJson.version),
    },
    copy: {
      patterns: [
        { from: `.cache/build/${platform}/${environment.name}/build-info.json`, to: `${outputDirectory(platform)}/build-info.json` },
        ...(platform === 'weapp' ? [{ from: `.cache/build/${platform}/${environment.name}/project.config.json`, to: `${outputDirectory(platform)}/project.config.json` }] : []),
      ],
      options: {},
    },
    mini: { postcss: { pxtransform: { enable: true }, cssModules: { enable: false } } },
    h5: {
      publicPath: '/',
      staticDirectory: 'static',
      router: { mode: 'hash' },
      devServer: { host: '127.0.0.1', port: 10086 },
      postcss: { pxtransform: { enable: true, config: { maxRootSize: 25.6 } }, autoprefixer: { enable: true }, cssModules: { enable: false } },
    },
  }
})