// Author: fruit.com.cn
import { useState } from 'react';
import { engagementApi } from '../api/engagement';
import { useMutation } from './useMutation';

/**
 * 点赞 / 收藏状态与交互，Shorts 与播放页共用。
 * likeTargetType: 'EPISODE' | 'DRAMA'
 */
export function useEngagement({ likeTargetType, likeTargetId, dramaId, initialLikeCount = 0, initialSaveCount = 0 }) {
  const [liked, setLiked] = useState(false);
  const [likeCount, setLikeCount] = useState(Number(initialLikeCount) || 0);
  const [saved, setSaved] = useState(false);
  const [saveCount, setSaveCount] = useState(Number(initialSaveCount) || 0);
  const likeMutation = useMutation(() => engagementApi.toggleLike(likeTargetType, likeTargetId));
  const saveMutation = useMutation(() => engagementApi.toggleFavorite(dramaId));

  const toggleLike = async () => {
    try {
      const result = await likeMutation.run();
      setLiked(Boolean(result?.liked));
      setLikeCount(Number(result?.count) || 0);
    } catch {
      // 交互失败时保持原状态，避免误导用户
    }
  };

  const toggleSave = async () => {
    try {
      const next = await saveMutation.run();
      setSaved(Boolean(next));
      setSaveCount((count) => Math.max(0, count + (next ? 1 : -1)));
    } catch {
      // 同上
    }
  };

  const syncStats = (stats) => {
    if (!stats) return;
    setLiked(Boolean(stats.liked));
    setLikeCount(Number(stats.likeCount) || 0);
    setSaved(Boolean(stats.favorited));
    setSaveCount(Number(stats.favoriteCount) || 0);
  };

  return {
    liked,
    likeCount,
    saved,
    saveCount,
    toggleLike,
    toggleSave,
    syncStats,
    pending: likeMutation.pending || saveMutation.pending,
  };
}