import { Search } from "@element-plus/icons-vue";
import dayjs from "dayjs";
import { userListNoPageByTenantId } from "@/api/system/user.js";
import { computed, getCurrentInstance, nextTick, onMounted, reactive, ref, watch } from "vue";
import {
  EXPENSE_CATEGORY_OPTIONS,
  CATEGORY_TEMPLATES,
  EXPENSE_SUBJECT_OPTIONS,
  expenseCategoryLabel,
  expenseSubjectLabel,
  statusLabel,
  statusTagType,
  formatApprovalFlowSummary,
  buildAutoApprovalFlow,
  getApprovalRuleHint,
  createEmptyExpenseDetail,
  createEmptyForm,
  applyCategoryTemplate,
  initApprovalFlowNodes,
  advanceApprovalFlow,
  rejectApprovalFlow,
  normalizeImportedRow,
} from "./costReimburseUtils.js";

function unwrapArray(payload) {
  if (Array.isArray(payload)) return payload;
  if (payload?.data && Array.isArray(payload.data)) return payload.data;
  if (payload?.rows && Array.isArray(payload.rows)) return payload.rows;
  return [];
}

function isActiveUser(u) {
  if (u.delFlag === "2" || u.delFlag === 2) return false;
  if (u.status == null) return true;
  return String(u.status) === "0";
}

function demoFlowNodes(amount = 1200, category = "transport") {
  return buildAutoApprovalFlow(amount, category);
}

export function useCostReimburse() {
  const { proxy } = getCurrentInstance();

  const allRows = ref([
    {
      id: "1",
      reimburseNo: "CR202605100001",
      applicantId: "mock_1",
      employeeNo: "zhangsan",
      employeeName: "张三",
      applicantNo: "zhangsan",
      applicantName: "张三",
      expenseCategory: "office_procurement",
      reimburseReason: "采购打印机硒鼓、A4纸等办公耗材。",
      applyAmount: 680,
      payee: "张三",
      payeeAccount: "6222 **** **** 1234",
      bankBranch: "中国工商银行杭州西湖支行",
      expenseDetails: [
        { id: "d1", invoiceDate: "2026-05-08", expenseSubject: "office_supply", amount: 380, description: "A4复印纸" },
        { id: "d2", invoiceDate: "2026-05-08", expenseSubject: "office_supply", amount: 300, description: "硒鼓" },
      ],
      attachmentList: [{ name: "采购发票.pdf", url: "/mock/invoice1.pdf" }],
      approvalFlowNodes: demoFlowNodes(680, "office_procurement"),
      currentNodeIndex: 0,
      approvalResult: "pending",
      rejectReason: "",
      approvalRecords: [],
      applyTime: "2026-05-10 09:15:00",
      createTime: "2026-05-10 09:15:00",
      deptId: "101",
      deptName: "行政部",
    },
    {
      id: "2",
      reimburseNo: "CR202605080002",
      applicantId: "mock_2",
      employeeNo: "lisi",
      employeeName: "李四",
      applicantNo: "lisi",
      applicantName: "李四",
      expenseCategory: "business_entertainment",
      reimburseReason: "接待重点客户商务宴请。",
      applyAmount: 3200,
      payee: "李四",
      payeeAccount: "6217 **** **** 5678",
      bankBranch: "招商银行武汉光谷支行",
      expenseDetails: [
        { id: "d3", invoiceDate: "2026-05-06", expenseSubject: "entertainment", amount: 3200, description: "客户宴请" },
      ],
      attachmentList: [],
      approvalFlowNodes: demoFlowNodes(3200, "business_entertainment").map((n, i) => ({
        ...n,
        nodeStatus: i === 0 ? "error" : "wait",
        approveOpinion: i === 0 ? "发票模糊需重传" : "",
        approveTime: i === 0 ? "2026-05-09 14:20:00" : "",
      })),
      currentNodeIndex: 0,
      approvalResult: "rejected",
      rejectReason: "发票模糊需重传",
      approvalRecords: [
        { operatorName: "直属上级", result: "rejected", opinion: "发票模糊需重传", time: "2026-05-09 14:20:00" },
      ],
      applyTime: "2026-05-07 16:30:00",
      createTime: "2026-05-07 16:30:00",
      deptId: "102",
      deptName: "销售部",
    },
    {
      id: "3",
      reimburseNo: "CR202605050003",
      applicantId: "mock_3",
      employeeNo: "wangwu",
      employeeName: "王五",
      applicantNo: "wangwu",
      applicantName: "王五",
      expenseCategory: "communication",
      reimburseReason: "5月因公话费报销。",
      applyAmount: 198,
      payee: "王五",
      payeeAccount: "6228 **** **** 9012",
      bankBranch: "中国建设银行成都高新支行",
      expenseDetails: [
        { id: "d4", invoiceDate: "2026-05-05", expenseSubject: "phone", amount: 198, description: "话费账单" },
      ],
      attachmentList: [{ name: "话费账单.jpg", url: "/mock/phone.jpg" }],
      approvalFlowNodes: demoFlowNodes(198, "communication").map((n) => ({
        ...n,
        nodeStatus: "finish",
        approveOpinion: "同意",
        approveTime: "2026-05-06 10:00:00",
      })),
      currentNodeIndex: 0,
      approvalResult: "approved",
      rejectReason: "",
      approvalRecords: [{ operatorName: "直属上级", result: "approved", opinion: "同意", time: "2026-05-06 10:00:00" }],
      applyTime: "2026-05-05 11:00:00",
      createTime: "2026-05-05 11:00:00",
      deptId: "103",
      deptName: "技术部",
    },
  ]);

  const searchForm = reactive({
    applicantKeyword: "",
    applyTimeFrom: "",
    applyTimeTo: "",
  });
  const tableLoading = ref(false);
  const page = reactive({ current: 1, size: 10, total: 0 });
  const importInputRef = ref(null);
  const allUsersCache = ref([]);
  const applicantFormSearchLoading = ref(false);
  const applicantFormOptions = ref([]);
  const formRef = ref();
  const form = reactive(createEmptyForm());
  const formDialog = reactive({ visible: false, title: "", mode: "add", readonly: false });
  const detailDialog = reactive({ visible: false });
  const detailRow = ref({});
  const approveDialog = reactive({ visible: false, row: null });
  const approveOpinion = ref("");

  const filteredList = computed(() => {
    let list = [...allRows.value];
    const kw = (searchForm.applicantKeyword || "").trim().toLowerCase();
    if (kw) {
      list = list.filter((r) => {
        const name = (r.applicantName || r.employeeName || "").toLowerCase();
        const no = (r.applicantNo || r.employeeNo || "").toLowerCase();
        return name.includes(kw) || no.includes(kw);
      });
    }
    if (searchForm.applyTimeFrom) {
      list = list.filter((r) => {
        const t = (r.applyTime || r.createTime || "").slice(0, 10);
        return !t || t >= searchForm.applyTimeFrom;
      });
    }
    if (searchForm.applyTimeTo) {
      list = list.filter((r) => {
        const t = (r.applyTime || r.createTime || "").slice(0, 10);
        return !t || t <= searchForm.applyTimeTo;
      });
    }
    return list.sort((a, b) => (String(a.createTime) < String(b.createTime) ? 1 : -1));
  });

  watch(
    filteredList,
    (list) => {
      page.total = list.length;
      const maxPage = Math.max(1, Math.ceil(list.length / page.size) || 1);
      if (page.current > maxPage) page.current = maxPage;
    },
    { immediate: true }
  );

  const tableData = computed(() => {
    const start = (page.current - 1) * page.size;
    return filteredList.value.slice(start, start + page.size).map((r) => ({
      ...r,
      approvalFlowSummary: formatApprovalFlowSummary(r),
    }));
  });

  const flowUserOptions = computed(() => allUsersCache.value.filter(isActiveUser));

  const detailTotalAmount = computed(() => {
    const sum = (form.expenseDetails || []).reduce((s, d) => s + (Number(d.amount) || 0), 0);
    return Math.round(sum * 100) / 100;
  });

  const approvalRuleHint = computed(() =>
    getApprovalRuleHint(form.applyAmount ?? detailTotalAmount.value, form.expenseCategory)
  );

  const tableColumn = ref([
    { label: "报销单号", prop: "reimburseNo", width: 150 },
    { label: "申请人编号", prop: "applicantNo", width: 110 },
    { label: "申请人", prop: "applicantName", minWidth: 90 },
    { label: "报销金额(元)", prop: "applyAmount", width: 110 },
    { label: "报销原因", prop: "reimburseReason", minWidth: 160, showOverflowTooltip: true },
    { label: "申请时间", prop: "applyTime", width: 165 },
    { label: "创建时间", prop: "createTime", width: 165 },
    {
      label: "报销状态",
      prop: "approvalResult",
      width: 100,
      dataType: "tag",
      formatData: (v) => statusLabel(v),
      formatType: (v) => statusTagType(v),
    },
    {
      label: "审批流程",
      prop: "approvalFlowSummary",
      minWidth: 200,
      showOverflowTooltip: true,
    },
    {
      dataType: "action",
      label: "操作",
      align: "center",
      fixed: "right",
      width: 220,
      operation: [
        {
          name: "编辑",
          type: "text",
          disabled: (row) => row.approvalResult === "pending" || row.approvalResult === "approved",
          clickFun: (row) => openFormDialog("edit", row),
        },
        { name: "详情", type: "text", clickFun: (row) => openDetail(row) },
        {
          name: "审批",
          type: "text",
          disabled: (row) => row.approvalResult !== "pending",
          clickFun: (row) => openApprove(row),
        },
      ],
    },
  ]);

  const formRules = {
    applicantId: [{ required: true, message: "请选择员工", trigger: "change" }],
    expenseCategory: [{ required: true, message: "请选择费用类型", trigger: "change" }],
    reimburseReason: [{ required: true, message: "请填写报销原因", trigger: "blur" }],
    applyAmount: [{ required: true, message: "请填写报销金额", trigger: "blur" }],
    payee: [{ required: true, message: "请填写收款人", trigger: "blur" }],
    payeeAccount: [{ required: true, message: "请填写收款账号", trigger: "blur" }],
    bankBranch: [{ required: true, message: "请填写开户支行", trigger: "blur" }],
    approvalFlowNodes: [
      {
        validator: (_r, _v, cb) => {
          const nodes = form.approvalFlowNodes || [];
          if (!nodes.length) {
            cb(new Error("请至少配置一个审批节点"));
            return;
          }
          if (nodes.some((n) => n.approverId == null || n.approverId === "")) {
            cb(new Error("每个节点须选择审批人"));
            return;
          }
          cb();
        },
        trigger: "change",
      },
    ],
  };

  async function loadUserPool() {
    try {
      allUsersCache.value = unwrapArray(await userListNoPageByTenantId());
    } catch {
      allUsersCache.value = [];
    }
  }

  function userSelectLabel(u) {
    const nick = u.nickName || "";
    const name = u.userName || "";
    if (nick && name && nick !== name) return `${nick}（${name}）`;
    return nick || name || `用户${u.userId ?? u.id ?? ""}`;
  }

  function userById(id) {
    return allUsersCache.value.find((u) => String(u.userId ?? u.id) === String(id));
  }

  function employeeNoFromUser(u) {
    if (!u) return "";
    return u.userName ?? u.userCode ?? u.jobNumber ?? u.workNo ?? (u.userId != null ? String(u.userId) : "");
  }

  function filterUsersByQuery(query) {
    const list = allUsersCache.value.filter(isActiveUser);
    const q = (query || "").trim().toLowerCase();
    if (!q) return [...list];
    return list.filter((u) => {
      const nick = (u.nickName || "").toLowerCase();
      const uname = (u.userName || "").toLowerCase();
      return nick.includes(q) || uname.includes(q);
    });
  }

  async function remoteSearchApplicantForm(query) {
    applicantFormSearchLoading.value = true;
    try {
      if (!allUsersCache.value.length) await loadUserPool();
      applicantFormOptions.value = filterUsersByQuery(query);
    } finally {
      applicantFormSearchLoading.value = false;
    }
  }

  function onApplicantChange(uid) {
    const u = userById(uid);
    if (u) {
      form.employeeName = u.nickName || u.userName || "";
      form.employeeNo = employeeNoFromUser(u);
      form.payee = form.payee || form.employeeName;
      form.deptId = String(u.deptId ?? u.sysDeptId ?? "");
      form.deptName = u.dept?.deptName ?? u.deptName ?? "";
    } else {
      form.employeeName = "";
      form.employeeNo = "";
    }
  }

  function autoAssignApprovalFlow() {
    const amount = Number(form.applyAmount) || detailTotalAmount.value || 0;
    form.approvalFlowNodes = buildAutoApprovalFlow(amount, form.expenseCategory || "other");
    nextTick(() => formRef.value?.validateField?.("approvalFlowNodes"));
  }

  function onExpenseCategoryChange(val) {
    if (val && !(form.expenseDetails || []).length) {
      applyCategoryTemplate(form, val);
      syncApplyAmountFromDetails();
    }
    autoAssignApprovalFlow();
  }

  function applyTemplate(category) {
    applyCategoryTemplate(form, category);
    syncApplyAmountFromDetails();
    autoAssignApprovalFlow();
    proxy?.$modal?.msgSuccess?.(`已应用「${CATEGORY_TEMPLATES[category]?.label || category}」填报模板`);
  }

  function onDetailAmountChange() {
    syncApplyAmountFromDetails();
    autoAssignApprovalFlow();
  }

  function onApprovalFlowChange() {
    nextTick(() => formRef.value?.validateField?.("approvalFlowNodes"));
  }

  function addExpenseDetail() {
    form.expenseDetails.push(createEmptyExpenseDetail());
  }

  function removeExpenseDetail(index) {
    form.expenseDetails.splice(index, 1);
    syncApplyAmountFromDetails();
    autoAssignApprovalFlow();
  }

  function syncApplyAmountFromDetails() {
    form.applyAmount = detailTotalAmount.value;
  }

  function handleQuery() {
    page.current = 1;
    tableLoading.value = true;
    setTimeout(() => {
      tableLoading.value = false;
    }, 150);
  }

  function resetSearch() {
    searchForm.applicantKeyword = "";
    searchForm.applyTimeFrom = "";
    searchForm.applyTimeTo = "";
    handleQuery();
  }

  function pagination(obj) {
    page.current = obj.page;
    page.size = obj.limit;
  }

  function openDetail(row) {
    detailRow.value = { ...row };
    detailDialog.visible = true;
  }

  function openApprove(row) {
    approveDialog.row = { ...row };
    approveDialog.visible = true;
  }

  function approvalActionLabel(v) {
    if (v === "approved") return "通过";
    if (v === "rejected") return "驳回";
    return "提交";
  }

  async function openFormDialog(mode, row) {
    formDialog.mode = mode;
    formDialog.readonly = false;
    formDialog.title = mode === "add" ? "新增费用报销" : "编辑费用报销";
    if (!allUsersCache.value.length) await loadUserPool();
    Object.assign(form, createEmptyForm());
    if (mode === "edit" && row) {
      Object.assign(form, {
        ...JSON.parse(JSON.stringify(row)),
        attachmentList: JSON.parse(JSON.stringify(row.attachmentList || row.invoiceAttachments || [])),
        approvalFlowNodes: JSON.parse(JSON.stringify(row.approvalFlowNodes || [])),
        expenseDetails: JSON.parse(JSON.stringify(row.expenseDetails || [])),
      });
      const u = userById(row.applicantId);
      applicantFormOptions.value = u
        ? [u]
        : [{ userId: row.applicantId, nickName: row.employeeName, userName: row.employeeNo }];
    } else {
      form.approvalFlowNodes = buildAutoApprovalFlow(0, "other");
      remoteSearchApplicantForm("");
    }
    formDialog.visible = true;
    nextTick(() => {
      formRef.value?.clearValidate?.();
    });
  }

  function onFormClosed() {
    formRef.value?.resetFields?.();
  }

  async function submitForm() {
    try {
      await formRef.value?.validate?.();
    } catch {
      return;
    }
    if (!(form.expenseDetails || []).length) {
      proxy?.$modal?.msgWarning?.("请至少添加一条报销明细");
      return;
    }
    syncApplyAmountFromDetails();
    autoAssignApprovalFlow();

    const payload = {
      reimburseNo: form.reimburseNo || `CR${dayjs().format("YYYYMMDDHHmmss")}`,
      applicantId: form.applicantId,
      employeeNo: form.employeeNo,
      employeeName: form.employeeName,
      applicantNo: form.employeeNo,
      applicantName: form.employeeName,
      expenseCategory: form.expenseCategory,
      reimburseReason: form.reimburseReason,
      applyAmount: form.applyAmount,
      payee: form.payee,
      payeeAccount: form.payeeAccount,
      bankBranch: form.bankBranch,
      expenseDetails: JSON.parse(JSON.stringify(form.expenseDetails)),
      attachmentList: JSON.parse(JSON.stringify(form.attachmentList || [])),
      invoiceAttachments: (form.attachmentList || []).map((f, i) => ({
        id: f.id ?? f.uid ?? `inv_${Date.now()}_${i}`,
        name: f.name || f.fileName || "未命名",
        url: f.url || f.downloadURL || "",
      })),
      approvalFlowNodes: initApprovalFlowNodes(form.approvalFlowNodes),
      currentNodeIndex: 0,
      deptId: form.deptId,
      deptName: form.deptName,
    };

    if (formDialog.mode === "add") {
      const now = dayjs().format("YYYY-MM-DD HH:mm:ss");
      allRows.value.unshift({
        id: `local_${Date.now()}`,
        ...payload,
        approvalResult: "pending",
        rejectReason: "",
        approvalRecords: [],
        applyTime: now,
        createTime: now,
      });
      proxy?.$modal?.msgSuccess?.("提交成功，已进入审批（本地模拟）");
    } else {
      const idx = allRows.value.findIndex((r) => r.id === form.id);
      if (idx !== -1) {
        const prev = allRows.value[idx];
        allRows.value[idx] = {
          ...prev,
          ...payload,
          id: form.id,
          approvalResult: prev.approvalResult === "rejected" ? "pending" : prev.approvalResult,
          approvalFlowNodes: initApprovalFlowNodes(form.approvalFlowNodes),
          currentNodeIndex: 0,
          rejectReason: prev.approvalResult === "rejected" ? "" : prev.rejectReason,
          applyTime: prev.applyTime,
          createTime: prev.createTime,
        };
      }
      proxy?.$modal?.msgSuccess?.("保存成功（本地模拟）");
    }
    formDialog.visible = false;
    handleQuery();
  }

  async function submitApprove(result) {
    const row = approveDialog.row;
    if (!row) return;
    if (result === "rejected" && !(approveOpinion.value || "").trim()) {
      proxy?.$modal?.msgWarning?.("驳回须填写审批意见（如：发票模糊需重传）");
      return;
    }
    const idx = allRows.value.findIndex((r) => r.id === row.id);
    if (idx === -1) return;
    const cur = allRows.value[idx];
    const operatorName = "当前审批人";
    const record = {
      operatorName,
      result,
      opinion: approveOpinion.value || (result === "approved" ? "同意" : "驳回"),
      time: dayjs().format("YYYY-MM-DD HH:mm:ss"),
    };
    const records = [...(cur.approvalRecords || []), record];
    let flowUpdate;
    if (result === "approved") {
      flowUpdate = advanceApprovalFlow(cur, approveOpinion.value);
    } else {
      flowUpdate = rejectApprovalFlow(cur, approveOpinion.value);
    }
    allRows.value[idx] = {
      ...cur,
      approvalFlowNodes: flowUpdate.nodes,
      currentNodeIndex: flowUpdate.currentNodeIndex,
      approvalResult: flowUpdate.approvalResult,
      rejectReason: flowUpdate.rejectReason ?? cur.rejectReason,
      approvalRecords: records,
    };
    proxy?.$modal?.msgSuccess?.(result === "approved" ? "已通过" : "已驳回");
    approveDialog.visible = false;
    handleQuery();
  }

  function handleExport() {
    const data = filteredList.value;
    const blob = new Blob([JSON.stringify(data, null, 2)], { type: "application/json;charset=utf-8" });
    const url = URL.createObjectURL(blob);
    const a = document.createElement("a");
    a.href = url;
    a.download = `费用报销导出_${dayjs().format("YYYYMMDDHHmmss")}.json`;
    a.click();
    URL.revokeObjectURL(url);
    proxy?.$modal?.msgSuccess?.(`已导出 ${data.length} 条`);
  }

  function handleImportClick() {
    importInputRef.value?.click?.();
  }

  function onImportFile(e) {
    const file = e.target.files?.[0];
    e.target.value = "";
    if (!file) return;
    const reader = new FileReader();
    reader.onload = () => {
      try {
        const parsed = JSON.parse(String(reader.result || ""));
        const arr = Array.isArray(parsed) ? parsed : parsed?.rows || parsed?.data;
        if (!Array.isArray(arr) || !arr.length) {
          proxy?.$modal?.msgWarning?.("导入格式须为费用报销 JSON 数组");
          return;
        }
        arr.forEach((raw, i) => allRows.value.unshift(normalizeImportedRow(raw, i)));
        proxy?.$modal?.msgSuccess?.(`成功导入 ${arr.length} 条`);
        handleQuery();
      } catch {
        proxy?.$modal?.msgError?.("解析失败");
      }
    };
    reader.readAsText(file, "utf-8");
  }

  onMounted(() => loadUserPool());

  return {
    Search,
    EXPENSE_CATEGORY_OPTIONS,
    CATEGORY_TEMPLATES,
    EXPENSE_SUBJECT_OPTIONS,
    expenseCategoryLabel,
    expenseSubjectLabel,
    searchForm,
    tableLoading,
    page,
    tableData,
    tableColumn,
    importInputRef,
    formRef,
    form,
    formDialog,
    formRules,
    detailDialog,
    detailRow,
    approveDialog,
    approveOpinion,
    applicantFormSearchLoading,
    applicantFormOptions,
    flowUserOptions,
    detailTotalAmount,
    approvalRuleHint,
    handleQuery,
    resetSearch,
    pagination,
    remoteSearchApplicantForm,
    userSelectLabel,
    onApplicantChange,
    onExpenseCategoryChange,
    applyTemplate,
    onDetailAmountChange,
    onApprovalFlowChange,
    addExpenseDetail,
    removeExpenseDetail,
    syncApplyAmountFromDetails,
    autoAssignApprovalFlow,
    openFormDialog,
    onFormClosed,
    submitForm,
    openDetail,
    approvalActionLabel,
    submitApprove,
    handleExport,
    handleImportClick,
    onImportFile,
  };
}