"use client";

import { useCallback, useEffect, useState } from "react";
import { AdminLayout } from "@/components/layout/admin-layout";
import { PageHeader } from "@/components/layout/page-header";
import { Skeleton } from "@/components/ui/skeleton";
import { ErrorBanner } from "@/components/ui/error-banner";
import { SecondaryButton } from "@/components/ui/primary-button";
import { PrimaryButton } from "@/components/ui/primary-button";
import { SelectField } from "@/components/ui/select-field";
import { Card } from "@/components/ui/card";
import {
  ALERT_TYPE_LABEL,
  ALERT_TYPE_TONE,
} from "@/lib/frontend/constants";
import { formatDateTime } from "@/lib/frontend/format";
import {
  adminGetAlerts,
  adminResolveAlert,
} from "@/lib/frontend/api-client";
import { useAuth } from "@/hooks/use-auth";
import type { AlertRecord, AlertType, DataPageStatus } from "@/lib/frontend/types";

const PAGE_SIZE = 10;

const TYPE_OPTIONS = [
  { value: "", label: "全部类型" },
  ...(
    Object.keys(ALERT_TYPE_LABEL) as AlertType[]
  ).map((t) => ({ value: t, label: ALERT_TYPE_LABEL[t] })),
];

const STATUS_OPTIONS = [
  { value: "", label: "全部状态" },
  { value: "open", label: "待处理" },
  { value: "resolved", label: "已处理" },
];

function toneClass(tone: "warning" | "error" | "neutral"): string {
  if (tone === "warning") return "bg-amber-100 text-warning";
  if (tone === "error") return "bg-red-100 text-error";
  return "bg-slate-100 text-text-secondary";
}

function DetailRow({
  label,
  value,
  mono,
}: {
  label: string;
  value: string;
  mono?: boolean;
}) {
  return (
    <div className="border-b border-border py-2">
      <dt className="text-xs text-text-secondary">{label}</dt>
      <dd className={`mt-0.5 text-sm ${mono ? "font-mono text-xs" : ""}`}>
        {value}
      </dd>
    </div>
  );
}

export default function AlertsPage() {
  const { token, user } = useAuth();
  const [status, setStatus] = useState<DataPageStatus>("loading");
  const [rows, setRows] = useState<AlertRecord[]>([]);
  const [total, setTotal] = useState(0);
  const [page, setPage] = useState(1);
  const [typeFilter, setTypeFilter] = useState("");
  const [statusFilter, setStatusFilter] = useState("open");
  const [detail, setDetail] = useState<AlertRecord | null>(null);
  const [resolving, setResolving] = useState(false);

  const load = useCallback(
    async (p: number, type: string, st: string) => {
      if (!token) return;
      setStatus("loading");
      const res = await adminGetAlerts("", token, p, PAGE_SIZE, type || undefined, st || undefined);
      if (res.code !== 0) {
        setStatus("error");
        return;
      }
      setRows(res.data.list);
      setTotal(res.data.total);
      setStatus(res.data.total === 0 ? "empty" : "success");
    },
    [token],
  );

  useEffect(() => {
    void load(page, typeFilter, statusFilter);
  }, [load, page, typeFilter, statusFilter]);

  const handleResolve = async (alert: AlertRecord) => {
    if (!token || !user) return;
    setResolving(true);
    const res = await adminResolveAlert("", token, alert.id, user.user_id);
    setResolving(false);
    if (res.code !== 0) return;
    setRows((list) =>
      list.map((a) =>
        a.id === alert.id
          ? { ...a, status: "resolved", resolved_at: new Date().toISOString() }
          : a,
      ),
    );
    setDetail(null);
  };

  const totalPages = Math.max(1, Math.ceil(total / PAGE_SIZE));

  return (
    <AdminLayout>
      <PageHeader
        title="预警中心"
        subtitle="查看查价失败根因、客户地址货物信息，便于追查问题"
        action={
          <div className="flex gap-3">
            <div className="w-40">
              <SelectField
                label=""
                aria-label="预警类型"
                name="type"
                value={typeFilter}
                options={TYPE_OPTIONS}
                onChange={(e) => {
                  setPage(1);
                  setTypeFilter(e.target.value);
                }}
              />
            </div>
            <div className="w-32">
              <SelectField
                label=""
                aria-label="预警状态"
                name="status"
                value={statusFilter}
                options={STATUS_OPTIONS}
                onChange={(e) => {
                  setPage(1);
                  setStatusFilter(e.target.value);
                }}
              />
            </div>
          </div>
        }
      />

      {status === "loading" && (
        <div className="space-y-2">
          {Array.from({ length: 5 }).map((_, i) => (
            <Skeleton key={i} className="h-12 w-full" />
          ))}
        </div>
      )}
      {status === "error" && (
        <ErrorBanner
          action={
            <SecondaryButton onClick={() => void load(page, typeFilter, statusFilter)}>
              重试
            </SecondaryButton>
          }
        >
          加载预警失败
        </ErrorBanner>
      )}
      {status === "empty" && (
        <Card>
          <p className="text-sm text-text-secondary">暂无符合条件的预警</p>
        </Card>
      )}

      {status === "success" && (
        <div className="space-y-4">
          <div className="overflow-x-auto rounded-lg border border-border bg-surface">
            <table className="min-w-full text-sm">
              <thead className="border-b border-border bg-bg text-left text-text-secondary">
                <tr>
                  <th className="px-4 py-3 font-medium">时间</th>
                  <th className="px-4 py-3 font-medium">类型</th>
                  <th className="px-4 py-3 font-medium">客户</th>
                  <th className="px-4 py-3 font-medium">报价单号</th>
                  <th className="px-4 py-3 font-medium">状态</th>
                </tr>
              </thead>
              <tbody>
                {rows.map((row) => (
                  <tr
                    key={row.id}
                    className="cursor-pointer border-b border-border hover:bg-bg"
                    onClick={() => setDetail(row)}
                  >
                    <td className="px-4 py-3 text-text-secondary">
                      {formatDateTime(row.created_at)}
                    </td>
                    <td className="px-4 py-3">
                      <span
                        className={`rounded-sm px-2 py-0.5 text-xs ${toneClass(ALERT_TYPE_TONE[row.alert_type])}`}
                      >
                        {ALERT_TYPE_LABEL[row.alert_type]}
                      </span>
                    </td>
                    <td className="px-4 py-3 font-mono text-xs">
                      {row.customer_id ?? "—"}
                    </td>
                    <td className="px-4 py-3 font-mono text-xs">
                      {row.quote_id ?? "—"}
                    </td>
                    <td className="px-4 py-3">
                      {row.status === "open" ? (
                        <span className="text-error">待处理</span>
                      ) : (
                        <span className="text-success">已处理</span>
                      )}
                    </td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
          <div className="flex items-center justify-between text-sm">
            <span className="text-text-secondary">共 {total} 条</span>
            <div className="flex gap-2">
              <SecondaryButton
                disabled={page <= 1}
                onClick={() => setPage((p) => p - 1)}
              >
                上一页
              </SecondaryButton>
              <span className="px-2 py-2 text-text-secondary">
                {page} / {totalPages}
              </span>
              <SecondaryButton
                disabled={page >= totalPages}
                onClick={() => setPage((p) => p + 1)}
              >
                下一页
              </SecondaryButton>
            </div>
          </div>
        </div>
      )}

      {detail && (
        <div
          className="fixed inset-0 z-50 flex justify-end bg-black/30"
          onClick={() => !resolving && setDetail(null)}
        >
          <div
            className="h-full w-full max-w-lg overflow-y-auto bg-surface p-6 shadow-modal"
            onClick={(e) => e.stopPropagation()}
          >
            <h3 className="text-lg font-semibold">预警详情</h3>
            <dl className="mt-4">
              <DetailRow label="预警编号" value={detail.id} mono />
              <DetailRow
                label="类型"
                value={ALERT_TYPE_LABEL[detail.alert_type]}
              />
              <DetailRow
                label="触发时间"
                value={formatDateTime(detail.created_at)}
              />
              <DetailRow
                label="客户"
                value={detail.customer_id ?? "—"}
                mono
              />
              <DetailRow
                label="报价单号"
                value={detail.quote_id ?? "—"}
                mono
              />
            </dl>

            <div className="mt-4 rounded-md border border-error/30 bg-error/5 p-3">
              <p className="text-xs font-medium text-error">根本原因</p>
              <p className="mt-1 text-sm leading-relaxed">
                {detail.root_cause ?? "暂无详细说明"}
              </p>
            </div>

            <div className="mt-4 space-y-3">
              <p className="text-sm font-medium">地址与货物</p>
              <DetailRow
                label="提货地址（客户填写）"
                value={detail.pickup_customer ?? "—"}
              />
              <DetailRow
                label="提货地址（联想确认）"
                value={detail.pickup_selected ?? "—"}
              />
              <DetailRow
                label="派送地址（客户填写）"
                value={detail.delivery_customer ?? "—"}
              />
              <DetailRow
                label="派送地址（联想确认）"
                value={detail.delivery_selected ?? "—"}
              />
              <DetailRow
                label="货物信息"
                value={detail.cargo_summary ?? "—"}
              />
            </div>

            <div className="mt-6 flex flex-wrap justify-end gap-3">
              <SecondaryButton disabled={resolving} onClick={() => setDetail(null)}>
                关闭
              </SecondaryButton>
              {detail.status === "open" && (
                <PrimaryButton
                  loading={resolving}
                  onClick={() => void handleResolve(detail)}
                >
                  标记已处理
                </PrimaryButton>
              )}
            </div>
          </div>
        </div>
      )}
    </AdminLayout>
  );
}