import { useRouter, useSearchParams } from "next/navigation";
import { useState, useEffect, useCallback, useRef } from "react";
import { toast } from "sonner";

import {
  POST_MESSAGE_TYPES,
  RECEIVE_MESSAGE_TYPES,
  isSelectedSkillMessage,
  isSelectedSkillsMessage,
  type SelectedSkillPayloadItem,
  sendToParent,
} from "@/core/iframe-messages";
import { bootstrapRemoteSkill } from "@/core/skills/api";

// Skill 数据类型
interface SkillData {
  skill_id: string;
  title: string;
}

// Hook 返回类型
interface UseIframeSkillReturn {
  selectedSkill: SkillData | null;
  isBootstrapping: boolean;
  sendSelectSkill: (selectedSkills: SelectedSkillPayloadItem[]) => void;
  bootstrapAndLockSkills: (params: {
    selectedSkills: SelectedSkillPayloadItem[];
    title: string;
  }) => Promise<boolean>;
  openSkillDialog: () => void;
  clearSkill: () => void;
}

interface UseIframeSkillOptions {
  threadId?: string | null;
}

export function useIframeSkill(
  options?: UseIframeSkillOptions,
): UseIframeSkillReturn {
  const router = useRouter();
  const searchParams = useSearchParams();
  const threadIdFromQuery = searchParams.get("thread_id");
  const threadId = options?.threadId?.trim() || threadIdFromQuery;
  const isChattingFromQuery = searchParams.get("is_chatting");
  const lastThreadIdRef = useRef<string | null>(null);

  const [selectedSkill, setSelectedSkill] = useState<SkillData | null>(null);
  const [isBootstrapping, setIsBootstrapping] = useState(false);

  // 1. 监听 query 参数变化（临时禁用）
  // TODO: 当前 skill 仅通过 iframe postMessage 传递，暂不从 URL 读取 skill_id/title。
  // useEffect(() => {
  //   const skillIdFromQuery = searchParams.get("skill_id");
  //   const titleFromQuery = searchParams.get("title");
  //   if (skillIdFromQuery && titleFromQuery) {
  //     setSelectedSkill({ skill_id: skillIdFromQuery, title: titleFromQuery });
  //   }
  // }, [searchParams]);

  // 0. 监听 query 中 is_chatting=true 且带 thread_id 时跳转到 thread 页面
  // useEffect(() => {
  //   if (!threadId) return;
  //   if (isChattingFromQuery !== "true") return;
  //   if (lastThreadIdRef.current === threadId) return;
  //   lastThreadIdRef.current = threadId;
  //   router.replace(`/workspace/chats/${threadId}`);
  // }, [isChattingFromQuery, router, threadId]);

  // 2. 监听宿主页 postMessage
  useEffect(() => {
    const handleMessage = (event: MessageEvent) => {
      if (isSelectedSkillMessage(event.data)) {
        const { id, title } = event.data;
        setSelectedSkill({ skill_id: String(id), title });
        return;
      }
      if (isSelectedSkillsMessage(event.data)) {
        const first = event.data.selectedSkills[0];
        if (!first) {
          setSelectedSkill(null);
          return;
        }
        setSelectedSkill({ skill_id: String(first.id), title: first.name });
        return;
      }
      if (event.data?.type === RECEIVE_MESSAGE_TYPES.SELECTED_SKILL) {
        console.warn("[useIframeSkill] 忽略非法 selectedSkill 消息", event.data);
      }
    };
    window.addEventListener("message", handleMessage);
    return () => window.removeEventListener("message", handleMessage);
  }, []);

  // 发送选择预定义 skill
  const sendSelectSkill = useCallback((selectedSkills: SelectedSkillPayloadItem[]) => {
    const message = { type: POST_MESSAGE_TYPES.SELECT_SKILLS, selectedSkills };
    console.log("[useIframeSkill] sendSelectSkill:", message);
    sendToParent(message);
  }, []);

  const bootstrapAndLockSkills = useCallback(
    async ({
      selectedSkills,
      title,
    }: {
      selectedSkills: SelectedSkillPayloadItem[];
      title: string;
    }) => {
      if (!threadId) {
        toast.error("技能加载失败", {
          description: "缺少 thread_id，无法初始化技能",
        });
        return false;
      }

      const content_ids = Array.from(
        new Set(
          selectedSkills
            .map((item) => Number(String(item.id).trim()))
            .filter((id) => Number.isFinite(id) && id > 0),
        ),
      );

      if (content_ids.length === 0) {
        toast.error("技能加载失败", {
          description: "无效的 skill_id",
        });
        return false;
      }

      const languageTypeRaw =
        searchParams.get("languageType")?.trim() ??
        searchParams.get("language_type")?.trim();
      const languageType = languageTypeRaw ? Number(languageTypeRaw) : 0;

      setIsBootstrapping(true);
      toast.loading(`正在加载技能「${title}」...`, { id: "suggest-skill-bootstrap" });

      try {
        const result = await bootstrapRemoteSkill({
          thread_id: threadId,
          content_ids,
          language_type: languageType,
          target_dir: "/mnt/user-data/uploads/skill",
          clear_target: true,
        });

        toast.dismiss("suggest-skill-bootstrap");

        if (!result.success) {
          toast.error(`技能「${title}」加载失败`, {
            description: result.message || "未知错误",
          });
          return false;
        }

        sendSelectSkill(selectedSkills);
        setSelectedSkill({ skill_id: String(content_ids[0]), title });

        toast.success(`技能「${title}」加载成功`, {
          description: result.message || `已创建 ${result.created_files} 个文件`,
        });

        return true;
      } catch (error) {
        toast.dismiss("suggest-skill-bootstrap");
        const message =
          error instanceof Error ? error.message : "网络请求失败";
        toast.error(`技能「${title}」加载失败`, {
          description: message,
        });
        return false;
      } finally {
        setIsBootstrapping(false);
      }
    },
    [searchParams, sendSelectSkill, threadId],
  );

  // 打开 skill 选择对话框
  const openSkillDialog = useCallback(() => {
    const message = {
      type: POST_MESSAGE_TYPES.OPEN_SKILL_DIALOG,
      openSkillDialog: true,
    } as const;
    console.log("[useIframeSkill] openSkillDialog:", message);
    sendToParent(message);
  }, []);

  // 清除选中并发送空 selectedSkills 数组给主页
  const clearSkill = useCallback(() => {
    setSelectedSkill(null);
    // 发送空数组给主页，通知取消选择
    const message = { type: POST_MESSAGE_TYPES.SELECT_SKILLS, selectedSkills: [] };
    console.log("[useIframeSkill] clearSkill, sending selectedSkills=[]:", message);
    sendToParent(message);
  }, []);

  return {
    selectedSkill,
    isBootstrapping,
    sendSelectSkill,
    bootstrapAndLockSkills,
    openSkillDialog,
    clearSkill,
  };
}