import { useTranslation } from "react-i18next";
import { RotateCcw, Zap } from "lucide-react";
import { useRestore, useStatus, useLogs } from "@/lib/queries";
import { useToast } from "@/components/toast";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Table, TBody, TD, TH, THead, TR } from "@/components/ui/table";

function formatUptime(seconds: number): string {
  if (seconds < 60) return `${seconds}s`;
  if (seconds < 3600) return `${Math.floor(seconds / 60)}m ${seconds % 60}s`;
  return `${Math.floor(seconds / 3600)}h ${Math.floor((seconds % 3600) / 60)}m`;
}

function formatTime(iso: string): string {
  const date = new Date(iso);
  return date.toLocaleTimeString();
}

export default function Dashboard() {
  const { t } = useTranslation();
  const status = useStatus();
  const logs = useLogs();
  const restore = useRestore();
  const { show } = useToast();

  if (status.isPending) {
    return <div className="text-sm text-zinc-500">{t("common.loading")}</div>;
  }
  if (status.isError || !status.data) {
    return (
      <div className="flex flex-col items-start gap-3">
        <span className="text-sm text-red-600">{t("common.error")}</span>
        <Button variant="outline" size="sm" onClick={() => status.refetch()}>
          {t("common.retry")}
        </Button>
      </div>
    );
  }

  const s = status.data;
  const active = s.active_claude_provider;

  return (
    <div className="flex flex-col gap-6">
      <div className="grid grid-cols-1 gap-4 sm:grid-cols-3">
        <Card>
          <CardHeader>
            <CardTitle>{t("dashboard.gateway")}</CardTitle>
          </CardHeader>
          <CardContent className="flex flex-col gap-2">
            <div className="flex items-center gap-2">
              <Badge tone={s.running ? "success" : "danger"}>
                {s.running ? t("dashboard.running") : t("dashboard.stopped")}
              </Badge>
              <span className="text-xs text-zinc-500">
                {t("dashboard.port")} {s.port}
              </span>
            </div>
            <div className="text-xs text-zinc-500">
              {t("dashboard.uptime")} {formatUptime(s.uptime_sec)} · {t("dashboard.version")}{" "}
              {s.version}
            </div>
          </CardContent>
        </Card>

        <Card>
          <CardHeader>
            <CardTitle>{t("dashboard.activeProvider")}</CardTitle>
          </CardHeader>
          <CardContent className="flex flex-col gap-2">
            {active ? (
              <>
                <div className="text-sm font-medium">{active.name}</div>
                <div className="truncate text-xs text-zinc-500" title={active.base_url}>
                  {active.base_url}
                </div>
              </>
            ) : (
              <div className="text-sm text-zinc-500">{t("dashboard.noActiveProvider")}</div>
            )}
          </CardContent>
        </Card>

        <Card>
          <CardHeader>
            <CardTitle>{t("dashboard.statsTitle")}</CardTitle>
          </CardHeader>
          <CardContent>
            <dl className="grid grid-cols-2 gap-2 text-xs">
              <div>
                <dt className="text-zinc-500">{t("dashboard.requests")}</dt>
                <dd className="text-base font-semibold">{s.stats.requests_total}</dd>
              </div>
              <div>
                <dt className="text-zinc-500">{t("dashboard.failed")}</dt>
                <dd className="text-base font-semibold">{s.stats.requests_failed}</dd>
              </div>
              <div>
                <dt className="text-zinc-500">{t("dashboard.tokensIn")}</dt>
                <dd className="text-base font-semibold">{s.stats.input_tokens}</dd>
              </div>
              <div>
                <dt className="text-zinc-500">{t("dashboard.tokensOut")}</dt>
                <dd className="text-base font-semibold">{s.stats.output_tokens}</dd>
              </div>
            </dl>
          </CardContent>
        </Card>
      </div>

      <Card>
        <CardHeader className="flex-row items-center justify-between">
          <CardTitle>{t("dashboard.recentRequests")}</CardTitle>
          <Button
            variant="outline"
            size="sm"
            disabled={restore.isPending}
            onClick={() =>
            restore.mutate(
              { target: "claude" },
              {
                onSuccess: () => show(t("dashboard.restoreDone")),
                onError: (err) => show(err.message, "error"),
              },
            )
            }
          >
            {restore.isPending ? (
              <RotateCcw size={14} className="animate-spin" aria-hidden />
            ) : (
              <Zap size={14} aria-hidden />
            )}
            {restore.isPending ? t("common.restoring") : t("common.restore")}
          </Button>
        </CardHeader>
        <CardContent>
          {logs.data && logs.data.items.length > 0 ? (
            <Table>
              <THead>
                <TR>
                  <TH>{t("dashboard.tableTime")}</TH>
                  <TH>{t("dashboard.tableModel")}</TH>
                  <TH>{t("dashboard.tableStatus")}</TH>
                  <TH>{t("dashboard.tableDuration")}</TH>
                  <TH>{t("dashboard.tableTokens")}</TH>
                </TR>
              </THead>
              <TBody>
                {logs.data.items.slice(0, 12).map((entry, index) => (
                  <TR key={`${entry.time}-${index}`}>
                    <TD className="text-xs text-zinc-500">{formatTime(entry.time)}</TD>
                    <TD className="font-mono text-xs">{entry.model ?? entry.path}</TD>
                    <TD>
                      <Badge tone={entry.status < 400 ? "success" : "danger"}>{entry.status}</Badge>
                    </TD>
                    <TD className="text-xs">{entry.duration_ms} ms</TD>
                    <TD className="text-xs">
                      {entry.input_tokens ?? 0} / {entry.output_tokens ?? 0}
                    </TD>
                  </TR>
                ))}
              </TBody>
            </Table>
          ) : (
            <div className="text-sm text-zinc-500">{t("dashboard.emptyLogs")}</div>
          )}
        </CardContent>
      </Card>
    </div>
  );
}