import dayjs from "dayjs";

/** 费用科目 */
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 statusLabel(v) {
  if (v === "approved") return "通过";
  if (v === "rejected") return "驳回";
  return "审核中";
}

export function statusTagType(v) {
  if (v === "approved") return "success";
  if (v === "rejected") return "danger";
  return "warning";
}

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;
  const days = Math.ceil(t1.diff(t0, "day", true));
  return Math.max(1, days);
}

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

export function createEmptyForm() {
  return {
    id: undefined,
    reimburseNo: "",
    applicantId: "",
    employeeNo: "",
    employeeName: "",
    reimburseReason: "",
    travelStartTime: "",
    travelEndTime: "",
    travelDays: undefined,
    departurePlace: "",
    destination: "",
    hotelStandard: undefined,
    hotelDays: undefined,
    livingSubsidy: undefined,
    applyAmount: undefined,
    payee: "",
    expenseDetails: [],
    attachmentList: [],
    approvalFlowNodes: [],
    currentNodeIndex: 0,
    needSpecialApproval: false,
    deptId: "",
    deptName: "",
    travelTier: "tier3",
  };
}

export function initApprovalFlowNodes(nodes) {
  return (nodes || []).map((n, i) => ({
    ...n,
    sortOrder: i + 1,
    nodeOrder: i + 1,
    nodeStatus: i === 0 ? "process" : "wait",
    approveOpinion: n.approveOpinion || "",
    approveTime: n.approveTime || "",
  }));
}

export function advanceApprovalFlow(row, opinion) {
  const nodes = [...(row.approvalFlowNodes || [])];
  const idx = row.currentNodeIndex ?? 0;
  if (!nodes.length) return { nodes, currentNodeIndex: idx, approvalResult: row.approvalResult };
  const now = dayjs().format("YYYY-MM-DD HH:mm:ss");
  nodes[idx] = {
    ...nodes[idx],
    nodeStatus: "finish",
    approveOpinion: opinion || "同意",
    approveTime: now,
  };
  const next = idx + 1;
  if (next >= nodes.length) {
    return { nodes, currentNodeIndex: idx, approvalResult: "approved" };
  }
  nodes[next] = { ...nodes[next], nodeStatus: "process" };
  return { nodes, currentNodeIndex: next, approvalResult: "pending" };
}

export function rejectApprovalFlow(row, opinion) {
  const nodes = [...(row.approvalFlowNodes || [])];
  const idx = row.currentNodeIndex ?? 0;
  const now = dayjs().format("YYYY-MM-DD HH:mm:ss");
  if (nodes[idx]) {
    nodes[idx] = {
      ...nodes[idx],
      nodeStatus: "error",
      approveOpinion: opinion || "驳回",
      approveTime: now,
    };
  }
  return { nodes, currentNodeIndex: idx, approvalResult: "rejected", rejectReason: opinion || "驳回" };
}

/** 模拟部门预算（与预算系统联动占位） */
export function mockDeptBudget(deptId) {
  const id = String(deptId || "default");
  let s = 0;
  for (let i = 0; i < id.length; i++) s += id.charCodeAt(i);
  const total = 500000 + (s % 200) * 1000;
  const used = (s % 80) * 3500;
  return {
    deptId: id,
    totalBudget: total,
    usedAmount: used,
    remainingAmount: Math.max(0, total - used),
  };
}

export function normalizeImportedRow(raw, idx) {
  const id = raw.id != null && String(raw.id).length ? `imp_${String(raw.id)}_${idx}` : `imp_${Date.now()}_${idx}`;
  const travelDays =
    raw.travelDays != null
      ? Number(raw.travelDays)
      : computeTravelDays(raw.travelStartTime, raw.travelEndTime);
  return {
    id,
    reimburseNo: raw.reimburseNo || `TR${dayjs().format("YYYYMMDD")}${String(idx).padStart(4, "0")}`,
    applicantId: raw.applicantId != null ? String(raw.applicantId) : `imp_user_${idx}`,
    employeeNo: raw.employeeNo ?? raw.applicantNo ?? "",
    employeeName: raw.employeeName ?? raw.applicantName ?? "未知",
    applicantNo: raw.employeeNo ?? raw.applicantNo ?? "",
    applicantName: raw.employeeName ?? raw.applicantName ?? "未知",
    reimburseReason: raw.reimburseReason ?? "",
    travelStartTime: raw.travelStartTime ?? "",
    travelEndTime: raw.travelEndTime ?? "",
    travelDays: travelDays == null || Number.isNaN(travelDays) ? 1 : travelDays,
    departurePlace: raw.departurePlace ?? "",
    destination: raw.destination ?? "",
    hotelStandard: raw.hotelStandard,
    hotelDays: raw.hotelDays,
    livingSubsidy: raw.livingSubsidy,
    applyAmount: raw.applyAmount ?? 0,
    payee: raw.payee ?? "",
    expenseDetails: Array.isArray(raw.expenseDetails) ? raw.expenseDetails : [],
    invoiceAttachments: Array.isArray(raw.invoiceAttachments) ? raw.invoiceAttachments : [],
    approvalFlowNodes: Array.isArray(raw.approvalFlowNodes) ? raw.approvalFlowNodes : [],
    currentNodeIndex: raw.currentNodeIndex ?? 0,
    approvalResult: ["pending", "approved", "rejected"].includes(raw.approvalResult) ? raw.approvalResult : "pending",
    rejectReason: raw.rejectReason ?? "",
    approvalRecords: Array.isArray(raw.approvalRecords) ? raw.approvalRecords : [],
    needSpecialApproval: !!raw.needSpecialApproval,
    deptId: raw.deptId ?? "",
    deptName: raw.deptName ?? "",
    travelTier: raw.travelTier || detectTravelTier(raw.destination),
    createTime: raw.createTime || dayjs().format("YYYY-MM-DD HH:mm:ss"),
  };
}