import { useMutation, useQuery } from "@tanstack/react-query";
import type { AxiosError } from "axios";
import { Key, Plus, RefreshCw, Trash2 } from "lucide-react";
import { Link } from "react-router-dom";
import { Badge } from "../../components/ui/badge";
import { Button } from "../../components/ui/button";
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from "../../components/ui/card";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "../../components/ui/table";
import { deleteApiKey, fetchApiKeys } from "../../lib/adminApi";
import { t } from "../../lib/i18n";

function ApiKeyListPage() {
  const query = useQuery({
    queryKey: ["api-keys", { limit: 50, offset: 0 }],
    queryFn: () => fetchApiKeys(50, 0),
  });

  const deleteMutation = useMutation({
    mutationFn: (id: string) => deleteApiKey(id),
    onSuccess: () => {
      query.refetch();
    },
  });

  const errorMsg = (query.error as AxiosError<{ error?: string }>)?.response
    ?.data?.error;
  const fallbackError =
    !errorMsg && query.isError
      ? t(
          "msg.admin.api_keys.list.fetch_error",
          "API 키 목록 조회에 실패했습니다.",
        )
      : null;

  const items = query.data?.items ?? [];

  const handleDelete = (id: string, name: string) => {
    if (
      !window.confirm(
        t(
          "msg.admin.api_keys.list.delete_confirm",
          'API 키 "{{name}}"를 삭제할까요?',
          { name },
        ),
      )
    ) {
      return;
    }
    deleteMutation.mutate(id);
  };

  return (
    <div className="space-y-6 flex flex-col h-[calc(100vh-theme(spacing.32))]">
      <header className="flex flex-wrap items-start justify-between gap-4 flex-shrink-0 sticky top-[-2.5rem] z-20 bg-background/95 backdrop-blur pt-4 pb-2 -mt-4">
        <div className="space-y-2">
          <h2 className="text-3xl font-semibold">
            {t("ui.admin.api_keys.list.title", "API 키 관리 (M2M)")}
          </h2>
          <p className="text-sm text-[var(--color-muted)]">
            {t(
              "msg.admin.api_keys.list.subtitle",
              "서버 간 통신(Machine-to-Machine)을 위한 API 키를 발급하고 관리합니다.",
            )}
          </p>
        </div>
        <div className="flex items-center gap-2">
          <Button
            variant="outline"
            onClick={() => query.refetch()}
            disabled={query.isFetching}
          >
            <RefreshCw size={16} />
            {t("ui.common.refresh", "새로고침")}
          </Button>
          <Button asChild>
            <Link to="/api-keys/new">
              <Plus size={16} />
              {t("ui.admin.api_keys.list.add", "API 키 생성")}
            </Link>
          </Button>
        </div>
      </header>

      <Card className="bg-[var(--color-panel)] flex-1 flex flex-col min-h-0 overflow-hidden">
        <CardHeader className="flex flex-row items-center justify-between flex-shrink-0">
          <div>
            <CardTitle>
              {t("ui.admin.api_keys.list.registry.title", "API Key Registry")}
            </CardTitle>
            <CardDescription>
              {t(
                "msg.admin.api_keys.list.registry.count",
                "총 {{count}}개 API 키",
                { count: query.data?.total ?? 0 },
              )}
            </CardDescription>
          </div>
          <Badge variant="muted">{t("ui.common.badge.system", "System")}</Badge>
        </CardHeader>
        <CardContent className="flex-1 flex flex-col min-h-0 pt-0">
          {(errorMsg || fallbackError) && (
            <div className="mb-4 rounded-lg border border-destructive/40 bg-destructive/10 px-3 py-2 text-sm text-destructive flex-shrink-0">
              {errorMsg ?? fallbackError}
            </div>
          )}

          <div className="flex-1 rounded-md border overflow-hidden flex flex-col">
            <div className="flex-1 overflow-auto relative custom-scrollbar">
              <Table>
                <TableHeader className="sticky top-0 z-10 bg-secondary shadow-sm">
                  <TableRow>
                    <TableHead>
                      {t("ui.admin.api_keys.list.table.name", "NAME")}
                    </TableHead>
                    <TableHead>
                      {t("ui.admin.api_keys.list.table.client_id", "CLIENT ID")}
                    </TableHead>
                    <TableHead>
                      {t("ui.admin.api_keys.list.table.scopes", "SCOPES")}
                    </TableHead>
                    <TableHead>
                      {t("ui.admin.api_keys.list.table.last_used", "LAST USED")}
                    </TableHead>
                    <TableHead className="text-right">
                      {t("ui.admin.api_keys.list.table.actions", "ACTIONS")}
                    </TableHead>
                  </TableRow>
                </TableHeader>
                <TableBody>
                  {query.isLoading && (
                    <TableRow>
                      <TableCell colSpan={5}>
                        {t("msg.common.loading", "로딩 중...")}
                      </TableCell>
                    </TableRow>
                  )}
                  {!query.isLoading && items.length === 0 && (
                    <TableRow>
                      <TableCell colSpan={5}>
                        {t(
                          "msg.admin.api_keys.list.empty",
                          "등록된 API 키가 없습니다.",
                        )}
                      </TableCell>
                    </TableRow>
                  )}
                  {items.map((key) => (
                    <TableRow key={key.id}>
                      <TableCell className="font-semibold">
                        <div className="flex items-center gap-2">
                          <Key
                            size={14}
                            className="text-[var(--color-muted)]"
                          />
                          {key.name}
                        </div>
                      </TableCell>
                      <TableCell>
                        <code>{key.client_id}</code>
                      </TableCell>
                      <TableCell>
                        <div className="flex flex-wrap gap-1">
                          {key.scopes.map((scope) => (
                            <Badge
                              key={scope}
                              variant="muted"
                              className="text-[10px]"
                            >
                              {scope}
                            </Badge>
                          ))}
                        </div>
                      </TableCell>
                      <TableCell>
                        {key.lastUsedAt
                          ? new Date(key.lastUsedAt).toLocaleString("ko-KR")
                          : t("ui.common.never", "Never")}
                      </TableCell>
                      <TableCell className="text-right">
                        <Button
                          variant="outline"
                          size="sm"
                          onClick={() => handleDelete(key.id, key.name)}
                          disabled={deleteMutation.isPending}
                        >
                          <Trash2 size={14} />
                          {t("ui.common.delete", "삭제")}
                        </Button>
                      </TableCell>
                    </TableRow>
                  ))}
                </TableBody>
              </Table>
            </div>
          </div>
        </CardContent>
      </Card>
    </div>
  );
}

export default ApiKeyListPage;