"use client";

import { useState, useCallback } from "react";
import { useRouter, usePathname } from "next/navigation";
import { useSession } from "next-auth/react";
import toast from "react-hot-toast";
import { useVoteStore } from "@/lib/store";
import type { Artist } from "@/types/artist";

interface UseVoteActionResult {
  /** 当前投票目标艺人（null 时弹窗关闭） */
  target: Artist | null;
  /** 触发投票（自动检查登录态） */
  openVote: (artist: Artist) => void;
  /** 关闭投票弹窗 */
  closeVote: () => void;
  /** 确认投票（已登录态下调用） */
  confirmVote: (artist: Artist, count: number) => Promise<void>;
}

/**
 * 投票交互统一入口。
 *
 * - 未登录 → 提示并跳登录页（登录后回到当前路径）
 * - 已登录 → 打开投票弹窗 → 确认后调用本地 store + 尝试调用 API
 * - 任意态 → 用 toast 反馈结果
 *
 * 注意：当前已取消所有投票数量限制（无每日上限 / 无单艺人上限）。
 */
export function useVoteAction(): UseVoteActionResult {
  const router = useRouter();
  const pathname = usePathname();
  const { status } = useSession();
  const recordVote = useVoteStore((s) => s.vote);
  const [target, setTarget] = useState<Artist | null>(null);

  const openVote = useCallback(
    (artist: Artist) => {
      if (status === "loading") return; // 会话还在加载，等一下
      if (status === "unauthenticated") {
        toast("请先登录后再为偶像投票", { icon: "🔐" });
        const back = encodeURIComponent(pathname || "/");
        setTimeout(() => router.push(`/login?callbackUrl=${back}`), 350);
        return;
      }
      setTarget(artist);
    },
    [status, pathname, router],
  );

  const closeVote = useCallback(() => setTarget(null), []);

  const confirmVote = useCallback(
    async (artist: Artist, count: number) => {
      // 1. 立即更新本地 store + 反馈（UI 0 延迟）
      recordVote(artist.id, count);
      toast.success(`已为 ${artist.name} 投出 ${count} 票`);
      setTarget(null);

      // 2. 后台 fire-and-forget 调用真实 API（5 秒超时，失败静默忽略）
      const ctrl = new AbortController();
      const timer = setTimeout(() => ctrl.abort(), 5000);
      fetch("/api/vote", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ artistId: artist.id, count }),
        signal: ctrl.signal,
      })
        .catch(() => {})
        .finally(() => clearTimeout(timer));
    },
    [recordVote],
  );

  return { target, openVote, closeVote, confirmVote };
}