/** 已知区域：标题 → 展示元数据（顺序即首页优先展示序） */
const REGION_DEFS = [
  {
    match: '市场部',
    key: 'market',
    title: '市场部',
    hint: '存储现场',
    tone: 'market'
  },
  {
    match: 'OA工作流',
    key: 'oa',
    title: 'OA工作流',
    hint: '审批协同',
    tone: 'oa'
  }
]

const OTHER = {
  key: 'other',
  title: '其他',
  hint: '',
  tone: 'other'
}

export function resolveRegionMeta(groupTitle) {
  const name = String(groupTitle || '').trim()
  if (!name) return { ...OTHER }
  const found = REGION_DEFS.find((d) => d.match === name)
  if (found) {
    return {
      key: found.key,
      title: found.title,
      hint: found.hint,
      tone: found.tone
    }
  }
  return {
    key: `custom:${name}`,
    title: name,
    hint: '',
    tone: 'other'
  }
}

/**
 * 按 groupTitle 聚合成区域；已知区域按 REGION_DEFS 顺序，其余按首次出现顺序排在后面。
 * @param {Array<{ groupTitle?: string }>} menus
 */
export function groupMenusByRegion(menus) {
  const list = Array.isArray(menus) ? menus : []
  if (!list.length) return []

  const buckets = new Map()
  for (const menu of list) {
    const meta = resolveRegionMeta(menu && menu.groupTitle)
    const key = meta.key
    if (!buckets.has(key)) {
      buckets.set(key, { ...meta, menus: [] })
    }
    buckets.get(key).menus.push(menu)
  }

  const ordered = []
  for (const def of REGION_DEFS) {
    if (buckets.has(def.key)) {
      ordered.push(buckets.get(def.key))
      buckets.delete(def.key)
    }
  }
  for (const region of buckets.values()) {
    ordered.push(region)
  }
  return ordered
}