import {
  createEmptyNode,
  formatDisplayTime,
  mapNodesFromApi,
  mapSignModeFromApi,
  mapSignModeToApi,
  normalizeFlowNodes,
  nodeSignModeLabel,
} from "../approve-template/approveTemplateConstants.js";
import { buildFormPayloadFromFields, parseFormConfigToData } from "../approve-template/formConfigUtils.js";

/** 审批类型（与后端字段 approvalType 对齐，后期可同步） */
export const APPROVAL_TYPE_OPTIONS = [
  { value: "cost_reimburse", label: "费用报销申请", cellBg: "#e8f8ef", cellColor: "#1a7f4b" },
  { value: "travel_reimburse", label: "差旅报销申请", cellBg: "#f0f2f5", cellColor: "#606266" },
  { value: "overtime", label: "加班申请", cellBg: "#fdf3e8", cellColor: "#c45c26" },
  { value: "leave", label: "请假申请", cellBg: "#fce8f0", cellColor: "#b84d7a" },
  { value: "work_handover", label: "工作交接申请", cellBg: "#f0e8fc", cellColor: "#6b4d9e" },
  { value: "regular", label: "转正申请", cellBg: "#e8f4fc", cellColor: "#2b6cb0" },
  { value: "resign", label: "离职申请", cellBg: "#ffffff", cellColor: "#303133", border: "1px solid #e4e7ed" },
  { value: "transfer", label: "调岗申请", cellBg: "#ffffff", cellColor: "#303133", border: "1px solid #e4e7ed" },
  { value: "out_office", label: "公出申请", cellBg: "#e8f4ff", cellColor: "#409eff" },
  { value: "business_trip", label: "出差申请", cellBg: "#fdf6ec", cellColor: "#e6a23c" },
  { value: "procurement", label: "采购审批", cellBg: "#f4f4f5", cellColor: "#909399" },
  { value: "quotation", label: "报价审批", cellBg: "#f4ecfc", cellColor: "#9b59b6" },
  { value: "shipment", label: "发货审批", cellBg: "#e8faf6", cellColor: "#1abc9c" },
];

/** 审批状态 approvalStatus */
export const APPROVAL_STATUS_OPTIONS = [
  { value: "pending", label: "审核中" },
  { value: "approved", label: "已通过" },
  { value: "rejected", label: "已驳回" },
  { value: "cancelled", label: "已撤销" },
];

export const LEGACY_APPROVE_LIST_STORAGE_KEY = "oa_unified_approve_list_v1";

export function clearLegacyApproveListStorage() {
  try {
    localStorage.removeItem(LEGACY_APPROVE_LIST_STORAGE_KEY);
  } catch {
    /* ignore */
  }
}

/** 提交弹窗：模板卡片（来自后端列表） */
export function mapSubmitTemplateCard(row) {
  const cfg = parseFormConfigToData(row?.formConfig);
  return {
    id: row?.id,
    key: String(row?.id ?? ""),
    approvalType: cfg.approvalType || row?.approvalType || "",
    label: row?.templateName || "—",
    summaryPlaceholder: (row?.description || "").trim() || cfg.summaryPlaceholder || "点击填写并提交",
  };
}

/** 审批记录 approveAction → 页面 result */
export function mapRecordResultFromApi(action) {
  const s = String(action || "").toUpperCase();
  if (s === "APPROVED" || s === "APPROVE" || s === "PASS") return "approved";
  if (s === "REJECTED" || s === "REJECT" || s === "REFUSE") return "rejected";
  return "pending";
}

/** 后端 records → 时间线展示结构 */
export function mapRecordsFromApi(records) {
  const list = Array.isArray(records) ? records : [];
  return list.map((r) => ({
    id: r.id,
    operatorName: r.approverName || r.operatorName || r.createUserName || "",
    result: mapRecordResultFromApi(r.approveAction ?? r.action ?? r.status),
    opinion: r.approveComment || r.comment || r.opinion || "",
    time: formatDisplayTime(r.approveTime || r.createTime || r.time || ""),
    raw: r,
  }));
}

export function mapTaskStatusLabel(status) {
  const s = String(status || "").toUpperCase();
  if (s === "APPROVED") return "已通过";
  if (s === "REJECTED") return "已驳回";
  if (s === "PENDING") return "待审批";
  if (s === "CANCELLED") return "已撤销";
  return status || "—";
}

export function mapTaskStatusTagType(status) {
  const s = String(status || "").toUpperCase();
  if (s === "APPROVED") return "success";
  if (s === "REJECTED") return "danger";
  if (s === "CANCELLED") return "info";
  return "warning";
}

/** 后端 tasks → 页面 flowNodes（按 levelNo 分组，供流程编辑/展示） */
export function mapTasksToFlowNodes(tasks) {
  const list = Array.isArray(tasks) ? tasks : [];
  if (!list.length) return [];
  const byLevel = new Map();
  list.forEach((t) => {
    const level = Number(t.levelNo ?? t.taskLevel ?? t.nodeOrder ?? 1);
    if (!byLevel.has(level)) {
      byLevel.set(level, {
        id: t.nodeId,
        templateId: t.templateId,
        nodeOrder: level,
        signMode: mapSignModeFromApi(t.approveType),
        approvers: [],
        tasks: [],
      });
    }
    const node = byLevel.get(level);
    node.approvers.push({
      id: t.id,
      nodeId: t.nodeId,
      templateId: t.templateId,
      approverId: t.approverId,
      approverName: t.approverName || "",
      status: t.status,
      approveComment: t.approveComment,
      approveTime: t.approveTime,
    });
    node.tasks.push(t);
    if (t.approveType != null) {
      node.signMode = mapSignModeFromApi(t.approveType);
    }
  });
  return [...byLevel.entries()]
    .sort(([a], [b]) => a - b)
    .map(([, node]) => node);
}

/** 页面 flowNodes → 后端 tasks */
export function mapFlowNodesToTasks(flowNodes, { instanceId, templateId } = {}) {
  const nodes = normalizeFlowNodes(flowNodes);
  const tasks = [];
  nodes.forEach((n) => {
    const levelNo = n.nodeOrder ?? 1;
    const approveType = mapSignModeToApi(n.signMode);
    n.approvers.forEach((a, idx) => {
      const task = {
        levelNo,
        approveType,
        approverId: a.approverId,
        approverName: a.approverName || "",
        sortNo: a.sortNo ?? idx + 1,
      };
      if (a.id != null) task.id = a.id;
      if (a.nodeId != null) task.nodeId = a.nodeId;
      if (a.templateId != null) task.templateId = a.templateId;
      else if (templateId) task.templateId = templateId;
      if (instanceId) task.instanceId = instanceId;
      if (a.status != null) task.status = a.status;
      tasks.push(task);
    });
  });
  return tasks;
}

function guessFieldTypeFromValue(val) {
  if (Array.isArray(val) && val.length === 2) return "datetimerange";
  if (typeof val === "number") return "number";
  if (typeof val === "string" && /^\d{4}-\d{2}-\d{2}$/.test(val)) return "date";
  if (typeof val === "string" && val.length > 100) return "textarea";
  return "text";
}

/** 单字段展示值（详情只读） */
export function formatFieldDisplayValue(field, val) {
  if (val == null || val === "" || (Array.isArray(val) && !val.length)) return "—";
  if (field?.type === "select" && field.options?.length) {
    const hit = field.options.find((o) => String(o.value) === String(val));
    return hit?.label || String(val);
  }
  if (Array.isArray(val)) return val.join(" 至 ");
  return String(val);
}

/**
 * 从行数据 / formConfig 解析填报字段定义与 formPayload（与新增提交结构一致）
 */
export function resolveInstanceFormFields(row) {
  const cfg = parseInstanceFormConfig(row?.formConfig);
  let fields = (row?.formFieldDefs?.length ? row.formFieldDefs : cfg.fields) || [];
  const formPayload = {
    ...(fields.length ? buildFormPayloadFromFields(fields) : {}),
    ...cfg.formPayload,
    ...(row?.formPayload || {}),
  };
  if (!fields.length && Object.keys(formPayload).length) {
    fields = Object.keys(formPayload)
      .filter((k) => k && k !== "summary")
      .map((k) => ({
        key: k,
        label: k,
        type: guessFieldTypeFromValue(formPayload[k]),
        required: false,
        rows: 3,
        min: 0,
        precision: 0,
        options: [],
      }));
  }
  const templateSnapshot = {
    label: row?.templateName || row?.title || "审批",
    approvalType: cfg.approvalType || row?.approvalType || "",
    summaryPlaceholder: cfg.summaryPlaceholder || "",
    templateId: row?.templateId,
    fields,
  };
  return { fields, formPayload, templateSnapshot, formConfigData: cfg };
}

/** 解析实例 formConfig */
export function parseInstanceFormConfig(formConfig) {
  let raw = {};
  if (formConfig) {
    if (typeof formConfig === "object") raw = formConfig;
    else {
      try {
        raw = JSON.parse(formConfig);
      } catch {
        raw = {};
      }
    }
  }
  const data = parseFormConfigToData(formConfig);
  const payload = raw.formPayload;
  return {
    summaryPlaceholder: raw.summaryPlaceholder || data.summaryPlaceholder || "",
    approvalType: raw.approvalType || "",
    fields: data.fields || [],
    formPayload: payload && typeof payload === "object" ? payload : {},
  };
}

export function unwrapInstanceDetail(res) {
  const data = res?.data ?? res;
  if (!data || typeof data !== "object") return {};
  if (data.id != null || data.instanceNo) return data;
  if (data.approvalInstanceVo) return data.approvalInstanceVo;
  return data;
}

/** 填报内容 + 模板字段定义 → formConfig JSON */
export function buildInstanceFormConfigJson(templateSnapshot, formPayload) {
  const payload = formPayload || {};
  return JSON.stringify({
    summaryPlaceholder: templateSnapshot?.summaryPlaceholder || "",
    approvalType: templateSnapshot?.approvalType || "",
    fields: templateSnapshot?.fields || [],
    formPayload: payload,
  });
}

/** 组装保存/更新审批 DTO */
export function buildInstanceDto({ submitForm, activeTemplate, userStore, flowNodes, existingRow }) {
  const payload = submitForm?.formPayload || {};
  const tpl = activeTemplate || {};
  const title =
    String(payload.summary || payload.title || "").trim() ||
    tpl.label ||
    submitForm?.templateName ||
    "审批申请";
  const templateId = submitForm?.templateId || tpl.templateId;
  const instanceId = existingRow?.id ?? submitForm?.instanceId;
  const taskList = mapFlowNodesToTasks(flowNodes || submitForm?.flowNodes, {
    instanceId,
    templateId,
  });
  const isUpdate = Boolean(instanceId);

  const dto = {
    templateId,
    templateName: submitForm?.templateName || tpl.label || "",
    title,
    formConfig: buildInstanceFormConfigJson({ ...tpl, fields: tpl.fields || submitForm?.formFieldDefs }, payload),
    tasks: taskList,
  };

  if (isUpdate) {
    dto.id = existingRow?.id ?? submitForm?.instanceId;
    dto.instanceNo = existingRow?.instanceNo ?? submitForm?.instanceNo ?? "";
    dto.status =
      existingRow?.statusRaw || mapInstanceStatusToApi(existingRow?.approvalStatus) || "PENDING";
    dto.currentLevel = existingRow?.currentLevel ?? submitForm?.currentLevel ?? 1;
    dto.applicantId = existingRow?.applicantId ?? existingRow?.applicantNo;
    dto.applicantName = existingRow?.applicantName || "";
  } else {
    dto.status = "PENDING";
    dto.currentLevel = 1;
    dto.applicantId = userStore?.id;
    dto.applicantName = userStore?.nickName || userStore?.name || "";
  }
  return dto;
}

/** @deprecated 使用 buildInstanceDto */
export function buildSaveInstanceDto(params) {
  return buildInstanceDto(params);
}

/** 校验提交审批流程（与模板页规则一致） */
export function validateSubmitFlowNodes(flowNodes) {
  const nodes = normalizeFlowNodes(flowNodes);
  if (!nodes.length) return { ok: false, message: "请至少配置一个审批节点" };
  for (let i = 0; i < nodes.length; i++) {
    if (!nodes[i].approvers.length) {
      return { ok: false, message: `请为第 ${i + 1} 个节点选择至少一名审批人` };
    }
  }
  return { ok: true, nodes };
}

/** 后端 status → 页面 approvalStatus */
export function mapInstanceStatusFromApi(status) {
  const s = String(status || "").toUpperCase();
  if (s === "APPROVED") return "approved";
  if (s === "REJECTED") return "rejected";
  if (s === "CANCELLED") return "cancelled";
  return "pending";
}

/** 页面 approvalStatus → 后端 status */
export function mapInstanceStatusToApi(approvalStatus) {
  const s = String(approvalStatus || "").toLowerCase();
  if (s === "approved") return "APPROVED";
  if (s === "rejected") return "REJECTED";
  if (s === "cancelled") return "CANCELLED";
  return "PENDING";
}

export function unwrapInstancePage(res) {
  const data = res?.data ?? res;
  return {
    records: Array.isArray(data?.records) ? data.records : [],
    total: Number(data?.total ?? 0),
  };
}

/** 分页列表项 → 表格行 */
export function mapInstanceFromApi(row) {
  if (!row) return {};
  const approvalStatus = mapInstanceStatusFromApi(row.status);
  const createTime = formatDisplayTime(row.createTime ?? row.applyTime ?? "");
  const applyTime = formatDisplayTime(row.applyTime ?? "");
  const finishTime = formatDisplayTime(row.finishTime ?? "");
  const resolved = resolveInstanceFormFields(row);
  const { fields, formPayload, templateSnapshot } = resolved;
  const tasks = Array.isArray(row.tasks) ? row.tasks : [];
  const flowNodes = tasks.length
    ? mapTasksToFlowNodes(tasks)
    : mapNodesFromApi(row.nodes || row.flowNodes);
  const approvalRecords = mapRecordsFromApi(row.records);
  return {
    id: row.id,
    bizId: row.instanceNo || String(row.id ?? ""),
    instanceNo: row.instanceNo || "",
    templateId: row.templateId,
    templateName: row.templateName || "",
    businessId: row.businessId,
    businessType: row.businessType,
    applicantId: row.applicantId,
    applicantNo: row.applicantId != null ? String(row.applicantId) : "",
    applicantName: row.applicantName || "",
    approvalType: row.templateName || "",
    unread: Boolean(row.isApprove) && approvalStatus === "pending",
    isApprove: Boolean(row.isApprove),
    approvalStatus,
    statusRaw: row.status,
    createTime,
    applyTime: applyTime === "—" ? "" : applyTime,
    finishTime: finishTime === "—" ? "" : finishTime,
    title: row.title || "",
    summary: row.title || row.templateName || "",
    currentLevel: row.currentLevel,
    formConfig: row.formConfig,
    formPayload,
    formFieldDefs: fields,
    templateSnapshot,
    tasks,
    records: Array.isArray(row.records) ? row.records : [],
    flowNodes,
    approvalFlowNodes: [],
    currentNodeIndex: 0,
    approvalRecords,
    rejectReason:
      approvalRecords.find((r) => r.result === "rejected")?.opinion || "",
  };
}

/** 审批操作：与后端 status 枚举一致 */
export const APPROVE_ACTION_APPROVED = "APPROVED";
export const APPROVE_ACTION_REJECTED = "REJECTED";

/** 页面操作 → approveAction */
export function mapApproveActionToApi(uiResult) {
  return uiResult === "rejected" ? APPROVE_ACTION_REJECTED : APPROVE_ACTION_APPROVED;
}

/** 组装审批提交 DTO */
export function buildApproveInstanceDto(row, uiResult, comment) {
  const opinion = (comment || "").trim();
  return {
    id: row?.id,
    approveAction: mapApproveActionToApi(uiResult),
    approveComment: opinion || (uiResult === "approved" ? "同意" : ""),
  };
}

export function buildApprovalInstanceListParams({ page, searchForm }) {
  const params = {
    current: page.current,
    size: page.size,
  };
  const dto = {};
  const kw = (searchForm?.applicantKeyword || "").trim();
  if (kw) dto.applicantName = kw;
  if (searchForm?.approvalType) {
    const opt = APPROVAL_TYPE_OPTIONS.find((x) => x.value === searchForm.approvalType);
    if (opt?.label) dto.templateName = opt.label;
  }
  if (Object.keys(dto).length) params.approvalInstanceDto = dto;
  return params;
}

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

export function approvalTypeStyle(v) {
  const hit = APPROVAL_TYPE_OPTIONS.find((x) => x.value === v);
  if (!hit) return {};
  return {
    backgroundColor: hit.cellBg,
    color: hit.cellColor,
    border: hit.border || "none",
  };
}

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

export function approvalStatusTagType(v) {
  if (v === "approved") return "success";
  if (v === "rejected") return "danger";
  if (v === "cancelled") return "info";
  return "primary";
}

export function unreadLabel(v) {
  return v ? "是" : "否";
}

/** 列表行 → 编辑表单（仅用行数据回显） */
export function buildEditFormFromInstanceRow(row) {
  const { fields, formPayload, templateSnapshot } = resolveInstanceFormFields(row);
  const normalized = normalizeFlowNodes(
    row?.flowNodes?.length ? row.flowNodes : mapTasksToFlowNodes(row?.tasks)
  );
  const flowNodes = normalized.length
    ? JSON.parse(JSON.stringify(normalized))
    : [createEmptyNode(1)];

  return {
    templateKey: String(row?.templateId || ""),
    templateId: row?.templateId,
    templateName: row?.templateName || templateSnapshot.label,
    instanceId: row?.id,
    instanceNo: row?.instanceNo || "",
    statusRaw: row?.statusRaw || row?.status || "PENDING",
    currentLevel: row?.currentLevel ?? 1,
    applicantId: row?.applicantId,
    applicantName: row?.applicantName || "",
    templateSnapshot,
    formFieldDefs: fields,
    formPayload,
    flowNodes,
  };
}

export function createEmptySubmitForm(templateKey, templateOverride, flowNodesOverride) {
  const tpl = templateOverride || null;
  const payload = tpl?.fields?.length ? buildFormPayloadFromFields(tpl.fields) : { summary: "" };
  const normalized = normalizeFlowNodes(flowNodesOverride);
  const flowNodes = normalized.length
    ? JSON.parse(JSON.stringify(normalized))
    : [createEmptyNode(1)];
  return {
    templateKey: templateKey || "",
    templateId: tpl?.templateId || "",
    templateName: tpl?.label || "",
    instanceId: "",
    instanceNo: "",
    statusRaw: "",
    currentLevel: 1,
    applicantId: null,
    applicantName: "",
    templateSnapshot: templateOverride || null,
    formFieldDefs: tpl?.fields || [],
    formPayload: payload,
    flowNodes,
  };
}