import { useMemo, useState } from "react";
import { useQuery } from "@tanstack/react-query";
import {
  fetchWecomApprovalArchive,
  fetchWecomApprovalArchiveDetail,
  type WecomApprovalArchiveFinding,
  type WecomApprovalArchiveItem,
  type WecomApprovalArchiveScope,
  type WecomApprovalArchiveStatus,
  type WecomApprovalArchiveType,
} from "../api/wecomApprovalArchive";
import { useAuth } from "../auth/AuthContext";
import { PageHeader } from "../components/common/PageHeader";
import { StatusBadge } from "../components/common/StatusBadge";
import { TableSkeleton } from "../components/common/TableSkeleton";
import { SectionPanel } from "../components/patterns/SectionPanel";
import { Button } from "../components/ui/button";
import { Label } from "../components/ui/label";
import { mapApiErrorMessage } from "../api/errorMessages";
import { isApiError } from "../api/types";

const TYPE_OPTIONS: Array<{ value: "" | WecomApprovalArchiveType; label: string }> = [
  { value: "", label: "全部类型" },
  { value: "leave", label: "请假" },
  { value: "missed_punch", label: "补卡" },
];

const STATUS_OPTIONS: Array<{ value: "" | WecomApprovalArchiveStatus; label: string }> = [
  { value: "", label: "全部状态" },
  { value: "approved", label: "已通过" },
  { value: "rejected", label: "已驳回" },
  { value: "revoked", label: "已撤销" },
  { value: "terminated", label: "已终止" },
  { value: "pending", label: "处理中" },
  { value: "unknown", label: "未知" },
];

const FINDING_OPTIONS: Array<{ value: "" | WecomApprovalArchiveFinding; label: string }> = [
  { value: "", label: "全部对账" },
  { value: "open", label: "仅未关闭 finding" },
  { value: "resolved", label: "已关闭 finding" },
  { value: "any", label: "有 finding" },
];

function resolveError(error: unknown, fallback = "读取企微审批历史失败") {
  if (isApiError(error)) {
    return `${error.code}: ${mapApiErrorMessage(error.code, error.details, error.message)}`;
  }
  return error instanceof Error ? error.message : fallback;
}

function typeLabel(value: string) {
  if (value === "leave") return "请假";
  if (value === "missed_punch") return "补卡";
  return value || "未知";
}

function sourceLabel(value: string | null) {
  if (value === "callback") return "回调";
  if (value === "compensation_pull") return "补偿拉取";
  return value || "-";
}

function actionLabel(value: string) {
  if (value === "approve") return "同意";
  if (value === "reject") return "驳回";
  if (value === "revoke") return "撤销";
  if (value === "terminate") return "终止";
  if (value === "pending") return "状态记录";
  return value || "状态记录";
}

function roleLabel(value: string) {
  if (value === "applicant") return "申请人";
  if (value === "approver") return "审批人";
  if (value === "notifyer") return "抄送人";
  return value || "-";
}

function formatTime(value: string | null) {
  if (!value) return "-";
  const date = new Date(value);
  if (Number.isNaN(date.getTime())) return "-";
  return date.toLocaleString("zh-CN", {
    month: "2-digit",
    day: "2-digit",
    hour: "2-digit",
    minute: "2-digit",
    hour12: false,
  });
}

function employeeLabel(employee: WecomApprovalArchiveItem["applicant"]) {
  if (!employee) return "未映射";
  return employee.employeeNo ? `${employee.name}（${employee.employeeNo}）` : employee.name;
}

function canRequestAll(roleCodes: string[], permissions: string[]) {
  return roleCodes.includes("hr") || roleCodes.includes("admin") || permissions.includes("*");
}

function ArchiveRow({
  item,
  active,
  onSelect,
}: {
  item: WecomApprovalArchiveItem;
  active: boolean;
  onSelect: () => void;
}) {
  return (
    <>
      <tr className={active ? "bg-primary/5" : ""}>
        <td className="px-3 py-3 align-top">
          <div className="font-medium text-zinc-900">{typeLabel(item.templateType)}</div>
          <div className="mt-1 text-xs text-zinc-500">{item.spName || "OA-POC 归档记录"}</div>
          <div className="mt-1 text-xs text-zinc-500">单号前缀：{item.spNoPrefix || "-"}</div>
        </td>
        <td className="px-3 py-3 align-top text-sm text-zinc-700">{employeeLabel(item.applicant)}</td>
        <td className="px-3 py-3 align-top"><StatusBadge status={item.normalizedStatus} /></td>
        <td className="px-3 py-3 align-top text-sm text-zinc-600">{formatTime(item.statusObservedAt || item.completedAt || item.appliedAt)}</td>
        <td className="px-3 py-3 align-top text-sm text-zinc-600">
          <div>{sourceLabel(item.lastSource)}</div>
          {item.openFindingCount ? <div className="mt-1 text-xs text-amber-700">finding {item.openFindingCount} 项</div> : null}
        </td>
        <td className="px-3 py-3 align-top text-right">
          <Button type="button" variant="secondary" onClick={onSelect}>查看历史</Button>
        </td>
      </tr>
    </>
  );
}

export function WecomApprovalArchivePage() {
  const { me, permissions } = useAuth();
  const [scope, setScope] = useState<WecomApprovalArchiveScope>("self");
  const [type, setType] = useState<"" | WecomApprovalArchiveType>("");
  const [status, setStatus] = useState<"" | WecomApprovalArchiveStatus>("");
  const [finding, setFinding] = useState<"" | WecomApprovalArchiveFinding>("");
  const [selectedId, setSelectedId] = useState("");
  const allAllowed = canRequestAll(me?.roleCodes ?? [], permissions);
  const query = useMemo(() => ({ scope, type, status, finding, pageSize: 50 }), [scope, type, status, finding]);

  const listQuery = useQuery({
    queryKey: ["wecom-approval-archive", query],
    queryFn: () => fetchWecomApprovalArchive(query),
  });

  const detailQuery = useQuery({
    enabled: Boolean(selectedId),
    queryKey: ["wecom-approval-archive", "detail", selectedId],
    queryFn: () => fetchWecomApprovalArchiveDetail(selectedId),
  });

  const items = listQuery.data?.items ?? [];
  const detail = detailQuery.data?.item ?? null;

  return (
    <div className="page-shell space-y-6" data-testid="wecom-approval-archive-page">
      <PageHeader
        eyebrow="企微审批历史"
        title="企微审批历史"
        subtitle="企业微信主办，OA 自建留存；仅已归档记录。这里用于历史查看、审计和补偿对账，不提供审批操作。"
        meta={
          <>
            <span className="rounded-full border border-emerald-200 bg-emerald-50 px-3 py-1 text-xs font-medium text-emerald-700">企业微信主办，OA 自建留存</span>
            <span className="rounded-full border border-slate-200 bg-slate-50 px-3 py-1 text-xs font-medium text-slate-700">仅已归档记录</span>
          </>
        }
      />

      <SectionPanel
        title="历史筛选"
        description="范围只覆盖已入库的请假、补卡记录；完整单号和企微 userid 仅保存在数据库内。"
      >
        <div className="grid gap-3 md:grid-cols-4">
          <div className="space-y-1.5">
            <Label htmlFor="wecom-archive-scope">查看范围</Label>
            <select
              id="wecom-archive-scope"
              className="input-std"
              value={scope}
              onChange={(event) => {
                setScope(event.target.value as WecomApprovalArchiveScope);
                setSelectedId("");
              }}
            >
              <option value="self">与我相关</option>
              <option value="team">直属团队</option>
              {allAllowed ? <option value="all">HR/管理员全量</option> : null}
            </select>
          </div>
          <div className="space-y-1.5">
            <Label htmlFor="wecom-archive-type">类型</Label>
            <select id="wecom-archive-type" className="input-std" value={type} onChange={(event) => setType(event.target.value as "" | WecomApprovalArchiveType)}>
              {TYPE_OPTIONS.map((option) => <option key={option.value || "all"} value={option.value}>{option.label}</option>)}
            </select>
          </div>
          <div className="space-y-1.5">
            <Label htmlFor="wecom-archive-status">状态</Label>
            <select id="wecom-archive-status" className="input-std" value={status} onChange={(event) => setStatus(event.target.value as "" | WecomApprovalArchiveStatus)}>
              {STATUS_OPTIONS.map((option) => <option key={option.value || "all"} value={option.value}>{option.label}</option>)}
            </select>
          </div>
          <div className="space-y-1.5">
            <Label htmlFor="wecom-archive-finding">对账</Label>
            <select id="wecom-archive-finding" className="input-std" value={finding} onChange={(event) => setFinding(event.target.value as "" | WecomApprovalArchiveFinding)}>
              {FINDING_OPTIONS.map((option) => <option key={option.value || "all"} value={option.value}>{option.label}</option>)}
            </select>
          </div>
        </div>
      </SectionPanel>

      <SectionPanel
        title="归档记录"
        description={`当前返回 ${items.length} 条，服务端总数 ${listQuery.data?.total ?? 0} 条。`}
      >
        {listQuery.isLoading ? <TableSkeleton columns={6} rows={5} /> : null}
        {listQuery.isError ? <div className="rounded-md border border-red-200 bg-red-50 px-3 py-2 text-sm text-red-700">{resolveError(listQuery.error)}</div> : null}
        {!listQuery.isLoading && !listQuery.isError && !items.length ? (
          <div className="rounded-md border border-dashed border-slate-300 bg-slate-50 px-4 py-8 text-center text-sm text-slate-500">
            暂无已归档的企微审批历史。若公网 OA DB 还没有留存数据，验收记录为 PARTIAL_ARCHIVE_NEEDS_DATA。
          </div>
        ) : null}
        {!listQuery.isLoading && !listQuery.isError && items.length ? (
          <>
            <div className="hidden overflow-x-auto md:block">
              <table className="min-w-full divide-y divide-slate-200 text-left">
                <thead className="bg-slate-50 text-xs font-semibold uppercase text-slate-500">
                  <tr>
                    <th className="px-3 py-2">类型/单号</th>
                    <th className="px-3 py-2">申请人</th>
                    <th className="px-3 py-2">状态</th>
                    <th className="px-3 py-2">状态时间</th>
                    <th className="px-3 py-2">来源/对账</th>
                    <th className="px-3 py-2 text-right">详情</th>
                  </tr>
                </thead>
                <tbody className="divide-y divide-slate-100">
                  {items.map((item) => (
                    <ArchiveRow key={item.id} item={item} active={selectedId === item.id} onSelect={() => setSelectedId(item.id)} />
                  ))}
                </tbody>
              </table>
            </div>
            <div className="divide-y divide-slate-100 md:hidden">
              {items.map((item) => (
                <article className="py-3" key={item.id}>
                  <div className="flex items-start justify-between gap-3">
                    <div className="min-w-0">
                      <div className="font-medium text-zinc-900">{typeLabel(item.templateType)}</div>
                      <div className="mt-1 text-xs text-zinc-500">单号前缀：{item.spNoPrefix || "-"}</div>
                    </div>
                    <StatusBadge status={item.normalizedStatus} />
                  </div>
                  <div className="mt-2 text-sm text-zinc-600">{employeeLabel(item.applicant)} · {formatTime(item.statusObservedAt || item.completedAt || item.appliedAt)}</div>
                  <div className="mt-2 flex items-center justify-between gap-3">
                    <span className="text-xs text-zinc-500">{sourceLabel(item.lastSource)}{item.openFindingCount ? ` · finding ${item.openFindingCount}` : ""}</span>
                    <Button type="button" variant="secondary" onClick={() => setSelectedId(item.id)}>查看历史</Button>
                  </div>
                </article>
              ))}
            </div>
          </>
        ) : null}
      </SectionPanel>

      <SectionPanel
        title="历史详情"
        description="详情只展示字段名称、字段类型、动作来源和脱敏人员摘要；不展示表单原文、评论、附件或完整企微标识。"
      >
        {!selectedId ? <div className="text-sm text-zinc-500">请选择一条归档记录查看详情。</div> : null}
        {selectedId && detailQuery.isLoading ? <TableSkeleton columns={1} rows={3} /> : null}
        {selectedId && detailQuery.isError ? <div className="rounded-md border border-red-200 bg-red-50 px-3 py-2 text-sm text-red-700">{resolveError(detailQuery.error)}</div> : null}
        {detail ? (
          <div className="grid gap-4 lg:grid-cols-3">
            <div className="space-y-3 lg:col-span-1">
              <div>
                <div className="text-xs text-zinc-500">状态</div>
                <div className="mt-1"><StatusBadge status={detail.normalizedStatus} /></div>
              </div>
              <div>
                <div className="text-xs text-zinc-500">申请人</div>
                <div className="mt-1 text-sm text-zinc-800">{employeeLabel(detail.applicant)}</div>
              </div>
              <div>
                <div className="text-xs text-zinc-500">单号前缀</div>
                <div className="mt-1 text-sm text-zinc-800">{detail.spNoPrefix || "-"}</div>
              </div>
              {detail.singleTapApproveRisk ? <div className="rounded-md border border-amber-200 bg-amber-50 px-3 py-2 text-sm text-amber-800">企微同意可能单击即通过，OA 仅留存动作来源和历史审计。</div> : null}
            </div>
            <div className="space-y-4 lg:col-span-2">
              <div>
                <h4 className="text-sm font-semibold text-zinc-900">字段摘要</h4>
                <div className="mt-2 divide-y divide-slate-100 rounded-md border border-slate-200">
                  {detail.fields.length ? detail.fields.map((field) => (
                    <div className="grid gap-1 px-3 py-2 text-sm md:grid-cols-3" key={field.id}>
                      <span className="font-medium text-zinc-800">{field.fieldName || field.fieldKey}</span>
                      <span className="text-zinc-500">{field.fieldType || "-"}</span>
                      <span className="text-zinc-500">{field.sensitiveLevel === "restricted" ? "受限字段" : "普通字段"}</span>
                    </div>
                  )) : <div className="px-3 py-3 text-sm text-zinc-500">暂无字段摘要。</div>}
                </div>
              </div>
              <div>
                <h4 className="text-sm font-semibold text-zinc-900">参与人与动作</h4>
                <div className="mt-2 grid gap-3 md:grid-cols-2">
                  <div className="rounded-md border border-slate-200">
                    {detail.participants.length ? detail.participants.map((item) => (
                      <div className="border-b border-slate-100 px-3 py-2 text-sm last:border-b-0" key={item.id}>
                        <span className="font-medium text-zinc-800">{roleLabel(item.role)}</span>
                        <span className="ml-2 text-zinc-600">{employeeLabel(item.employee)}</span>
                      </div>
                    )) : <div className="px-3 py-3 text-sm text-zinc-500">暂无映射参与人。</div>}
                  </div>
                  <div className="rounded-md border border-slate-200">
                    {detail.actions.length ? detail.actions.map((item) => (
                      <div className="border-b border-slate-100 px-3 py-2 text-sm last:border-b-0" key={item.id}>
                        <span className="font-medium text-zinc-800">{actionLabel(item.actionType)}</span>
                        <span className="ml-2 text-zinc-600">{employeeLabel(item.operator)}</span>
                        <div className="mt-1 text-xs text-zinc-500">{formatTime(item.actionTime)} · {sourceLabel(item.source)}</div>
                      </div>
                    )) : <div className="px-3 py-3 text-sm text-zinc-500">暂无动作历史。</div>}
                  </div>
                </div>
              </div>
              <div>
                <h4 className="text-sm font-semibold text-zinc-900">对账 finding</h4>
                <div className="mt-2 divide-y divide-slate-100 rounded-md border border-slate-200">
                  {detail.findings.length ? detail.findings.map((item) => (
                    <div className="flex flex-wrap items-center justify-between gap-2 px-3 py-2 text-sm" key={item.id}>
                      <span className="font-medium text-zinc-800">{item.findingType}</span>
                      <span className="text-zinc-500">{item.status} · {item.severity} · {formatTime(item.detectedAt)}</span>
                    </div>
                  )) : <div className="px-3 py-3 text-sm text-zinc-500">暂无对账 finding。</div>}
                </div>
              </div>
            </div>
          </div>
        ) : null}
      </SectionPanel>
    </div>
  );
}