import type { BrowserSessionView } from "@umt/contracts";
import { LoaderCircle, RotateCw } from "lucide-react";
import { useCallback, useEffect, useRef, useState } from "react";
import { useBrowserReconnect } from "~/api/browser.ts";
import { StatusBadge } from "~/components/console/status-badge.tsx";
import { Button } from "~/components/ui/button.tsx";
import { ApiRequestError, errorMessage } from "~/lib/api.ts";

// BR-3 浏览器服务(camofox)重启后的自动重连:截图模式与桌面模式共用。
// 收到"标签页 / 会话不在了"(404)、"已被回收"(409)或自动重连失败(503),或会话详情标了 needsReconnect 时,
// 自动调用一次 POST /browser/sessions/{id}/reconnect;成功后继续轮询,失败显示原因与"重新连接"按钮,不再反复刷错误。

/** 这个错误是否说明浏览器服务重启过(上游标签页 / 会话不在了、自动重连失败) */
export function isBrowserGone(err: unknown): boolean {
  if (!(err instanceof ApiRequestError)) return false;
  if (err.code === "not_found" || err.code === "browser_reconnect_failed") return true;
  return err.code === "conflict" && /回收/.test(err.message);
}

export type ReconnectPhase = { phase: "idle" } | { phase: "reconnecting" } | { phase: "failed"; reason: string };

/**
 * gone = 当前视图收到了"浏览器不在了"类错误。每次出问题只自动重连一次(问题消失后复位);
 * 失败后等人点"重新连接"(retry)。onReconnected:重连成功(桌面模式据此重建 Selkies 连接)。
 */
export function useAutoReconnect(
  siteId: string,
  session: BrowserSessionView | null,
  gone: boolean,
  onReconnected?: () => void,
) {
  const mutation = useBrowserReconnect(siteId);
  const [state, setState] = useState<ReconnectPhase>({ phase: "idle" });
  const tried = useRef<string | null>(null);
  const logged = useRef(false);
  const done = useRef(onReconnected);
  done.current = onReconnected;
  const id = session && session.controller !== "closed" ? session.id : null;
  const trigger = !!id && (gone || session?.needsReconnect === true);
  const { mutate } = mutation;

  const run = useCallback(() => {
    if (!id) return;
    setState({ phase: "reconnecting" });
    mutate(id, {
      onSuccess: () => {
        setState({ phase: "idle" });
        done.current?.();
      },
      onError: (e) => setState({ phase: "failed", reason: errorMessage(e, "浏览器服务不可用") }),
    });
  }, [id, mutate]);

  useEffect(() => {
    if (!trigger) {
      // 问题消失(截图恢复 / 会话不再需要重连):下次再出问题时还能自动重连一次
      if (tried.current === id) tried.current = null;
      return;
    }
    if (tried.current === id) return;
    tried.current = id;
    if (!logged.current) {
      logged.current = true;
      console.debug("[browser] 浏览器服务可能重启过，自动重新连接一次", id);
    }
    run();
  }, [trigger, id, run]);

  return { state, retry: run, busy: state.phase === "reconnecting" };
}

/** 画面区域:重连中 / 重连失败(原因 + 重新连接按钮) */
export function ReconnectPanel({
  state,
  error,
  onRetry,
}: {
  state: ReconnectPhase;
  /** idle 但仍拿到"浏览器不在了"类错误时显示它的消息 */
  error?: unknown;
  onRetry: () => void;
}) {
  if (state.phase === "reconnecting")
    return (
      <div role="status" className="flex flex-col items-center justify-center gap-3 px-6 py-12 text-center">
        <LoaderCircle className="h-5 w-5 animate-spin text-muted-foreground" />
        <p className="text-lead font-medium text-foreground">浏览器已重启，正在重新连接…</p>
        <p className="text-caption text-muted-foreground">重新注入账号登录态，并回到原来的页面。</p>
      </div>
    );
  const reason = state.phase === "failed" ? state.reason : errorMessage(error, "浏览器服务不可用");
  return (
    <div role="alert" className="flex flex-col items-center justify-center gap-3 px-6 py-12 text-center">
      <p className="text-lead font-medium text-foreground">浏览器连接已断开</p>
      <p className="max-w-md text-caption break-words text-muted-foreground">{reason}</p>
      <Button variant="outline" size="sm" onClick={onRetry}>
        <RotateCw />
        重新连接
      </Button>
    </div>
  );
}

/** 人工接管中浏览器重连过:页面已重新加载(表单输入、滚动位置都没了),提示核对;点"知道了"收起 */
export function ReloadNotice({ session }: { session: BrowserSessionView }) {
  const r = session.reconnect;
  const at = r?.status === "ok" && r.humanNotice && session.controller === "human" ? r.at : null;
  const [dismissed, setDismissed] = useState<string | null>(null);
  if (!at || dismissed === at) return null;
  return (
    <div className="flex flex-wrap items-center gap-2">
      <StatusBadge tone="warning">浏览器重启过，页面已重新加载，表单输入和滚动位置已丢失</StatusBadge>
      <Button variant="ghost" size="xs" onClick={() => setDismissed(at)}>
        知道了
      </Button>
    </div>
  );
}