const fs = require('node:fs')
const path = require('node:path')

const projectRoot = path.resolve(__dirname, '..')
const h5Root = path.join(projectRoot, 'dist', 'build', 'h5')
const faviconSource = path.join(projectRoot, 'public', 'favicon.svg')
const faviconTarget = path.join(h5Root, 'favicon.svg')

if (!fs.existsSync(h5Root)) {
  throw new Error(`H5 build output not found: ${h5Root}`)
}

const copyDirectory = (source, target) => {
  fs.mkdirSync(target, { recursive: true })

  for (const entry of fs.readdirSync(source, { withFileTypes: true })) {
    const sourcePath = path.join(source, entry.name)
    const targetPath = path.join(target, entry.name)

    if (entry.isDirectory()) {
      copyDirectory(sourcePath, targetPath)
      continue
    }

    if (entry.isFile()) {
      fs.copyFileSync(sourcePath, targetPath)
    }
  }
}

const copyStaticSubtree = (subtree) => {
  const sourceDir = path.join(projectRoot, 'static', subtree)
  const targetDir = path.join(h5Root, 'static', subtree)

  if (!fs.existsSync(sourceDir)) {
    throw new Error(`Static assets not found: ${sourceDir}`)
  }

  fs.rmSync(targetDir, { recursive: true, force: true })
  copyDirectory(sourceDir, targetDir)
  console.log(`Copied ${subtree} assets to ${path.relative(projectRoot, targetDir)}`)
}

const copyPublicStaticSubtree = (subtree) => {
  const sourceDir = path.join(projectRoot, 'public', 'static', subtree)
  const targetDir = path.join(h5Root, 'static', subtree)

  if (!fs.existsSync(sourceDir)) {
    throw new Error(`Public static assets not found: ${sourceDir}`)
  }

  fs.rmSync(targetDir, { recursive: true, force: true })
  copyDirectory(sourceDir, targetDir)
  console.log(`Copied public static ${subtree} assets to ${path.relative(projectRoot, targetDir)}`)
}

const copyStaticFile = (fileName) => {
  const sourceFile = path.join(projectRoot, 'static', fileName)
  const targetFile = path.join(h5Root, 'static', fileName)

  if (!fs.existsSync(sourceFile)) {
    throw new Error(`Static file not found: ${sourceFile}`)
  }

  fs.mkdirSync(path.dirname(targetFile), { recursive: true })
  fs.copyFileSync(sourceFile, targetFile)
  console.log(`Copied ${fileName} to ${path.relative(projectRoot, targetFile)}`)
}

copyStaticSubtree('nav-assets')
copyStaticSubtree('guide-data')
copyStaticSubtree('icons')
// 讲解业务单元封面由 H5 运行时按 /static/explain/... 动态加载。
copyStaticSubtree('explain')
copyStaticSubtree('sgs-map-sdk')
copyStaticSubtree('three')
copyStaticFile('exhibit-placeholder.jpg')
copyStaticFile('hall-placeholder.jpg')
copyPublicStaticSubtree('Fonts')

if (fs.existsSync(faviconSource)) {
  fs.copyFileSync(faviconSource, faviconTarget)
}