import { businessRouteById } from './business-routes.js';

export type LeaderTaskSummaryMilestone = 'final' | 'needs_review' | 'resolved';
export type LeaderTaskSummaryStatus = 'completed' | 'failed' | 'cancelled' | 'needs_review';

export interface LeaderTaskSummaryInput {
  taskId: string;
  status: string;
  businessRouteId: string | null;
  assigneeUsername: string;
  createdAt: string | Date;
  successReceipt?: Record<string, unknown> | null;
  hadNeedsReview?: boolean;
}

export interface LeaderTaskSummaryProjection {
  milestone: LeaderTaskSummaryMilestone;
  deliveryStatus: LeaderTaskSummaryStatus;
  statusLabel: '已完成' | '未完成' | '已取消' | '需人工核验';
  businessLabel: string;
  resultText: string;
  messageText: string;
}

const COMPLETED_STATUSES = new Set(['completed', 'dry_run']);
const FAILED_STATUSES = new Set([
  'failed',
  'parse_failed',
  'parse_blocked',
  'agent_parse_blocked',
  'blocked',
  'operation_blocked'
]);
const NEEDS_REVIEW_STATUSES = new Set([
  'reconciliation_pending',
  'saved_unverified',
  'execution_uncertain',
  'uncertain'
]);

function singleLine(value: unknown, maxLength: number): string {
  return String(value ?? '')
    .normalize('NFKC')
    .replace(/[\u0000-\u001f\u007f]+/gu, ' ')
    .replace(/\s+/gu, ' ')
    .trim()
    .slice(0, maxLength);
}

function identifierValues(...values: unknown[]): string[] {
  const output: string[] = [];
  const visit = (value: unknown): void => {
    if (Array.isArray(value)) {
      value.forEach(visit);
      return;
    }
    if (typeof value !== 'string' && typeof value !== 'number') return;
    const candidate = singleLine(value, 80);
    if (!candidate || !/^(?=.*\d)[A-Za-z0-9._/()-]{4,80}$/u.test(candidate)) return;
    if (/^1[3-9]\d{9}$/u.test(candidate) || /^\d{15,18}[xX]?$/u.test(candidate)) return;
    if (!output.includes(candidate)) output.push(candidate);
  };
  values.forEach(visit);
  return output.slice(0, 10);
}

function completedResult(status: string, receipt: Record<string, unknown>): string {
  if (status === 'dry_run') return '业务方案已生成，尚未正式提交。';
  const groupNumbers = identifierValues(receipt.group_numbers, receipt.group_number);
  const orderNumbers = identifierValues(receipt.order_numbers, receipt.order_number);
  const details = [
    groupNumbers.length ? `团号：${groupNumbers.join('、')}` : '',
    orderNumbers.length ? `订单号：${orderNumbers.join('、')}` : ''
  ].filter(Boolean);
  return details.length
    ? `业务处理已完成。${details.join('；')}`.slice(0, 300)
    : '业务处理已完成，结果已记录。';
}

export function formatShanghaiTimestamp(value: string | Date): string {
  const date = value instanceof Date ? value : new Date(value);
  if (Number.isNaN(date.getTime())) return '时间未记录';
  const parts = new Intl.DateTimeFormat('en-CA', {
    timeZone: 'Asia/Shanghai',
    year: 'numeric',
    month: '2-digit',
    day: '2-digit',
    hour: '2-digit',
    minute: '2-digit',
    second: '2-digit',
    hourCycle: 'h23'
  }).formatToParts(date);
  const part = (type: Intl.DateTimeFormatPartTypes) => (
    parts.find((item) => item.type === type)?.value || ''
  );
  return `${part('year')}-${part('month')}-${part('day')} ${part('hour')}:${part('minute')}:${part('second')}`;
}

export function buildLeaderTaskSummary(
  input: LeaderTaskSummaryInput
): LeaderTaskSummaryProjection | null {
  const status = singleLine(input.status, 80).toLowerCase();
  let deliveryStatus: LeaderTaskSummaryStatus;
  let statusLabel: LeaderTaskSummaryProjection['statusLabel'];
  let resultText: string;
  if (COMPLETED_STATUSES.has(status)) {
    deliveryStatus = 'completed';
    statusLabel = '已完成';
    resultText = completedResult(status, input.successReceipt || {});
  } else if (FAILED_STATUSES.has(status)) {
    deliveryStatus = 'failed';
    statusLabel = '未完成';
    resultText = '本次工作未完成，请在平台查看业务结果。';
  } else if (status === 'cancelled') {
    deliveryStatus = 'cancelled';
    statusLabel = '已取消';
    resultText = '这项工作已取消。';
  } else if (NEEDS_REVIEW_STATUSES.has(status)) {
    deliveryStatus = 'needs_review';
    statusLabel = '需人工核验';
    resultText = '当前结果需要人工核验，请勿重复提交。';
  } else {
    return null;
  }

  const milestone: LeaderTaskSummaryMilestone = deliveryStatus === 'needs_review'
    ? 'needs_review'
    : input.hadNeedsReview
      ? 'resolved'
      : 'final';
  const route = businessRouteById(input.businessRouteId);
  const businessLabel = singleLine(route?.directive || '其他任务', 120) || '其他任务';
  const assignee = singleLine(input.assigneeUsername, 160) || '未知员工';
  const taskId = singleLine(input.taskId, 200) || '任务编号未记录';
  const header = milestone === 'resolved' ? '【员工任务摘要·结果更新】' : '【员工任务摘要】';
  return {
    milestone,
    deliveryStatus,
    statusLabel,
    businessLabel,
    resultText: resultText.slice(0, 300),
    messageText: [
      header,
      `员工：${assignee}`,
      `业务：${businessLabel}`,
      `状态：${statusLabel}`,
      `任务：${taskId}`,
      `提交：${formatShanghaiTimestamp(input.createdAt)}`,
      `结果：${resultText.slice(0, 300)}`
    ].join('\n')
  };
}

export function isLeaderTaskSummaryStatus(value: unknown): boolean {
  const status = singleLine(value, 80).toLowerCase();
  return COMPLETED_STATUSES.has(status)
    || FAILED_STATUSES.has(status)
    || NEEDS_REVIEW_STATUSES.has(status)
    || status === 'cancelled';
}