/**
 * 扫描 public/static 下各赛事文件夹，生成 manifest.json
 * 约定子目录：背景、口令、赛事LOGO、秩序册
 */
import fs from 'fs'
import path from 'path'
import { fileURLToPath } from 'url'

const __dirname = path.dirname(fileURLToPath(import.meta.url))
const ROOT = path.join(__dirname, '..', 'public', 'static')

/** 优先使用新目录名，兼容旧名称 */
const SUBDIR_CANDIDATES = {
  backgrounds: ['背景', '背景图'],
  passwords: ['口令'],
  logos: ['赛事LOGO', '赛事logo'],
  rosters: ['秩序册'],
}

function resolveSubdir(folderPath, candidates) {
  for (const name of candidates) {
    if (fs.existsSync(path.join(folderPath, name))) return name
  }
  return candidates[0]
}

const IMAGE_EXT = new Set(['.jpg', '.jpeg', '.png', '.webp', '.gif', '.bmp', '.svg'])
const ROSTER_EXT = new Set(['.txt', '.csv', '.xlsx', '.xls'])
const PASSWORD_EXT = new Set(['.mp3'])
const LOGO_EXT = IMAGE_EXT

function listFiles(dir, allowedExt) {
  if (!fs.existsSync(dir)) return []
  return fs
    .readdirSync(dir, { withFileTypes: true })
    .filter(
      (e) =>
        e.isFile() &&
        !e.name.startsWith('~$') &&
        allowedExt.has(path.extname(e.name).toLowerCase()),
    )
    .map((e) => e.name)
    .sort((a, b) => a.localeCompare(b, 'zh-CN'))
}

/** 使用原始路径；由前端 resolveStaticUrl 统一编码 */
function toPublicPath(folder, sub, file) {
  return `/static/${folder}/${sub}/${file}`
}

function readEventMeta(folderPath) {
  const metaPath = path.join(folderPath, 'event.json')
  if (!fs.existsSync(metaPath)) return {}
  try {
    return JSON.parse(fs.readFileSync(metaPath, 'utf-8'))
  } catch {
    return {}
  }
}

function scan() {
  if (!fs.existsSync(ROOT)) {
    fs.mkdirSync(ROOT, { recursive: true })
    return { generatedAt: new Date().toISOString(), events: [] }
  }

  const events = []
  for (const entry of fs.readdirSync(ROOT, { withFileTypes: true })) {
    if (!entry.isDirectory()) continue
    if (entry.name.startsWith('.')) continue

    const folder = entry.name
    const folderPath = path.join(ROOT, folder)
    const meta = readEventMeta(folderPath)

    const bgDir = resolveSubdir(folderPath, SUBDIR_CANDIDATES.backgrounds)
    const pwdDir = resolveSubdir(folderPath, SUBDIR_CANDIDATES.passwords)
    const logoDir = resolveSubdir(folderPath, SUBDIR_CANDIDATES.logos)
    const rosterDir = resolveSubdir(folderPath, SUBDIR_CANDIDATES.rosters)

    const backgrounds = listFiles(path.join(folderPath, bgDir), IMAGE_EXT).map((file) => ({
      file,
      path: toPublicPath(folder, bgDir, file),
    }))

    const passwords = listFiles(path.join(folderPath, pwdDir), PASSWORD_EXT).map((file) => ({
      file,
      path: toPublicPath(folder, pwdDir, file),
    }))

    const logos = listFiles(path.join(folderPath, logoDir), LOGO_EXT).map((file) => ({
      file,
      path: toPublicPath(folder, logoDir, file),
    }))

    const rosters = listFiles(path.join(folderPath, rosterDir), ROSTER_EXT).map((file) => ({
      file,
      path: toPublicPath(folder, rosterDir, file),
    }))

    events.push({
      id: folder,
      name: meta.displayName || folder,
      folder,
      backgrounds,
      passwords,
      logos,
      rosters,
    })
  }

  events.sort((a, b) => a.name.localeCompare(b.name, 'zh-CN'))

  return {
    generatedAt: new Date().toISOString(),
    events,
  }
}

const manifest = scan()
const outPath = path.join(ROOT, 'manifest.json')
fs.writeFileSync(outPath, JSON.stringify(manifest, null, 2), 'utf-8')
console.log(`[static-manifest] ${manifest.events.length} 个赛事 -> ${outPath}`)