import { isUuidLike } from "./reimbursementDisplay";

export type ApprovalHistoryDisplayItem = {
  id: string;
  action: string;
  comment: string | null;
  actorName: string | null;
  actorEmployeeNo?: string | null;
  createdAt: string | null;
};

type PendingWorkflowLike = {
  currentStatus?: string | null;
  task?: {
    stepName?: string | null;
    assigneeRole?: string | null;
  } | null;
} | null;

type LeaveStatusLike = {
  status: string;
  pendingWorkflow?: PendingWorkflowLike;
  approvalHistory?: ApprovalHistoryDisplayItem[];
};

type PurchaseStatusLike = {
  status: string;
  requestNo?: string | null;
  title?: string | null;
  createdAt?: string | null;
  updatedAt?: string | null;
  budgetPool?: { name?: string | null } | null;
  pendingWorkflow?: PendingWorkflowLike;
  approvalHistory?: ApprovalHistoryDisplayItem[];
};

export function workflowActionLabel(action: string | null | undefined) {
  const labels: Record<string, string> = {
    start: "提交",
    submit: "提交",
    approve: "通过",
    reject: "驳回",
    return: "退回",
    transfer: "转审",
    withdraw: "撤回",
    remind: "催办",
    overdue_remind: "超时提醒",
    skip: "跳过",
    cancel: "取消",
  };

  return action ? labels[action] ?? action : "-";
}

export function formatApprovalHistoryTime(value: string | null | undefined) {
  return value ? value.slice(0, 19).replace("T", " ") : "-";
}

export function latestDecisionHistory(items: ApprovalHistoryDisplayItem[] | null | undefined) {
  return (items ?? []).find((item) => ["return", "reject", "withdraw", "approve"].includes(item.action)) ?? null;
}

function commentSuffix(item: ApprovalHistoryDisplayItem | null) {
  if (!item?.comment?.trim()) {
    return "";
  }
  return `：${item.comment.trim()}`;
}

export function resolveLeaveStatusHint(item: LeaveStatusLike) {
  const latest = latestDecisionHistory(item.approvalHistory);

  if (item.status === "draft") {
    if (latest?.action === "return") {
      return `审批已退回${commentSuffix(latest)}。修改后可重新提交。`;
    }
    if (latest?.action === "withdraw") {
      return "已撤回为草稿，可修改后重新提交。";
    }
    return "草稿可继续编辑，确认后提交审批。";
  }

  if (item.status === "reviewing") {
    const stepName = item.pendingWorkflow?.task?.stepName;
    return stepName ? `当前节点：${stepName}，等待审批人处理。` : "已提交，等待审批人处理。";
  }

  if (item.status === "approved") {
    return "已通过，系统会按请假结果更新额度和团队状态。";
  }

  if (item.status === "rejected") {
    return latest?.action === "reject"
      ? `审批已驳回${commentSuffix(latest)}。可修改后重新提交。`
      : "审批已驳回，可修改后重新提交。";
  }

  if (item.status === "cancelled") {
    return "已取消，不再进入审批。";
  }

  return "请查看审批记录确认下一步。";
}

export function resolvePurchaseDisplayCode(item: PurchaseStatusLike) {
  const requestNo = item.requestNo?.trim();
  if (requestNo && !isUuidLike(requestNo)) {
    return requestNo;
  }

  const title = item.title?.trim();
  if (title) {
    return title;
  }

  const date = item.updatedAt?.slice(0, 10) ?? item.createdAt?.slice(0, 10) ?? "";
  if (item.status === "draft" || item.status === "rejected") {
    return date ? `采购草稿 · ${date}` : "采购草稿";
  }

  return date ? `未编号采购 · ${date}` : "未编号采购";
}

export function resolvePurchaseBudgetHint(item: PurchaseStatusLike) {
  if (item.budgetPool?.name) {
    return `已匹配预算池：${item.budgetPool.name}`;
  }

  return "未匹配预算池；当前试运行按预警继续提交审批，如需强预算校验请由管理员补充预算配置。";
}

export function resolvePurchaseSubmitWarning(warnings: string[]) {
  if (warnings.includes("missing_budget_pool")) {
    return "采购申请已提交；未匹配预算池，已按当前试运行规则继续进入审批。";
  }
  return "采购申请已提交";
}

export function resolvePurchaseStatusHint(item: PurchaseStatusLike) {
  const latest = latestDecisionHistory(item.approvalHistory);

  if (item.status === "draft") {
    if (latest?.action === "return") {
      return `审批已退回${commentSuffix(latest)}。修改后可重新提交。`;
    }
    if (latest?.action === "withdraw") {
      return "已撤回为草稿，可修改后重新提交。";
    }
    return "草稿可继续编辑，补齐明细和附件后提交审批。";
  }

  if (item.status === "reviewing") {
    const stepName = item.pendingWorkflow?.task?.stepName;
    return stepName ? `当前节点：${stepName}，等待审批人处理。` : "已提交，等待审批人处理。";
  }

  if (item.status === "approved") {
    return "已通过，可由有权限人员完成 PO/合同归档或后续处理。";
  }

  if (item.status === "rejected") {
    return latest?.action === "reject"
      ? `审批已驳回${commentSuffix(latest)}。可修改后重新提交。`
      : "审批已驳回，可修改后重新提交。";
  }

  if (item.status === "cancelled") {
    return "已取消，不再进入审批。";
  }

  return "请查看审批记录确认下一步。";
}