import dayjs from "dayjs";

export const EXPENSE_SUBJECT_OPTIONS = [
  { label: "交通费", value: "transport" },
  { label: "住宿费", value: "hotel" },
  { label: "餐饮费", value: "meal" },
  { label: "其他", value: "other" },
];

const TIER1_CITIES = ["北京", "上海", "广州", "深圳"];

export function expenseSubjectLabel(v) {
  return EXPENSE_SUBJECT_OPTIONS.find(x => x.value === v)?.label || "—";
}

export function detectTravelTier(destination) {
  const city = (destination || "").trim();
  if (!city) return "tier3";
  if (TIER1_CITIES.some(c => city.includes(c))) return "tier1";
  const tier2Keywords = ["杭州", "南京", "武汉", "成都", "重庆", "西安", "天津", "苏州", "长沙", "郑州"];
  if (tier2Keywords.some(c => city.includes(c))) return "tier2";
  return "tier3";
}

export function getTravelStandardByTier(tier) {
  const map = {
    tier1: { hotelPerNight: 600, transportPerDay: 80, mealPerDay: 100, label: "一线城市" },
    tier2: { hotelPerNight: 450, transportPerDay: 60, mealPerDay: 80, label: "二线城市" },
    tier3: { hotelPerNight: 350, transportPerDay: 40, mealPerDay: 60, label: "其他城市" },
  };
  return map[tier] || map.tier3;
}

export function computeTravelDays(startStr, endStr) {
  if (!startStr || !endStr) return null;
  const t0 = dayjs(startStr);
  const t1 = dayjs(endStr);
  if (!t0.isValid() || !t1.isValid() || !t1.isAfter(t0)) return null;
  return Math.max(1, Math.ceil(t1.diff(t0, "day", true)));
}

export function createEmptyExpenseDetail() {
  return {
    id: `ed_${Date.now()}_${Math.random().toString(36).slice(2, 7)}`,
    invoiceDate: "",
    expenseSubject: "",
    amount: "",
    description: "",
  };
}

export function createEmptyTravelForm() {
  return {
    reimbursementId: undefined,
    applicantId: "",
    employeeNo: "",
    employeeName: "",
    reimburseReason: "",
    travelStartTime: "",
    travelEndTime: "",
    travelDays: undefined,
    departurePlace: "",
    destination: "",
    hotelStandard: undefined,
    hotelDays: undefined,
    livingSubsidy: undefined,
    transportSubsidy: undefined,
    lodgingLimit: undefined,
    applyAmount: "",
    payee: "",
    payeeAccount: "",
    payeeBank: "",
    expenseDetails: [],
    attachmentList: [],
    approvalFlowNodes: [{ approverId: "", approverName: "", nodeOrder: 1, signMode: "countersign" }],
    needSpecialApproval: false,
    deptId: "",
    deptName: "",
    travelTier: "tier3",
    standardTag: "",
  };
}