export type FirstPassReviewStatus = 'approved' | 'revision_required' | 'pending_review' | 'unknown'

export type FirstPassReviewStatusCount = {
  status: string
  count: number
}

export type FirstPassReviewSummary = {
  totalUploads: number
  totalApproved: number
  firstPassApproved: number
  rate: number | null
  statusBreakdown: {
    approved: number
    revisionRequired: number
    pendingReview: number
    unknown: number
  }
  readAt: string
  /** 作品过稿后台的增量检查状态；统计本身仍直接读取该后台。 */
  syncStatus?: 'idle' | 'syncing' | 'ready' | 'error'
  lastSyncedAt?: string | null
  syncRowsChecked?: number
}

export function normalizeFirstPassReviewStatus(status: string): FirstPassReviewStatus {
  if (status === 'approved' || status === 'revision_required' || status === 'pending_review') {
    return status
  }
  return 'unknown'
}

/**
 * 首轮通过率 = V1 审核通过作品数 / 当前已通过作品数。
 *
 * totalUploads 和状态拆分用于展示全部 V1 明细，不参与比率分母。
 */
export function buildFirstPassReviewSummary(
  rows: FirstPassReviewStatusCount[],
  totalApproved: number,
  readAt = new Date(),
): FirstPassReviewSummary {
  const statusBreakdown = {
    approved: 0,
    revisionRequired: 0,
    pendingReview: 0,
    unknown: 0,
  }

  for (const row of rows) {
    const count = Math.max(0, Number(row.count) || 0)
    const normalizedStatus = normalizeFirstPassReviewStatus(row.status)
    if (normalizedStatus === 'approved') statusBreakdown.approved += count
    else if (normalizedStatus === 'revision_required') statusBreakdown.revisionRequired += count
    else if (normalizedStatus === 'pending_review') statusBreakdown.pendingReview += count
    else statusBreakdown.unknown += count
  }

  const totalUploads = Object.values(statusBreakdown).reduce((total, count) => total + count, 0)
  const approvedDenominator = Math.max(0, Number(totalApproved) || 0)
  const firstPassApproved = statusBreakdown.approved

  return {
    totalUploads,
    totalApproved: approvedDenominator,
    firstPassApproved,
    rate: approvedDenominator === 0
      ? null
      : Math.round((firstPassApproved / approvedDenominator) * 1000) / 10,
    statusBreakdown,
    readAt: readAt.toISOString(),
  }
}