// =====================================================
// 競賽參賽應用 API
// =====================================================

import { NextRequest, NextResponse } from 'next/server';
import { CompetitionService } from '@/lib/services/database-service';
import { AppService } from '@/lib/services/database-service';

// 獲取競賽的參賽應用
export async function GET(request: NextRequest, { params }: { params: { id: string } }) {
  try {
    const { id } = await params;
    const { searchParams } = new URL(request.url);
    
    const search = searchParams.get('search') || '';
    const category = searchParams.get('category') || 'all';
    const type = searchParams.get('type') || 'all';
    const department = searchParams.get('department') || 'all';
    const competitionType = searchParams.get('competitionType') || 'all';
    
    // 獲取競賽信息
    const competition = await CompetitionService.getCompetitionWithDetails(id);
    if (!competition) {
      return NextResponse.json({
        success: false,
        message: '競賽不存在',
        error: '找不到指定的競賽'
      }, { status: 404 });
    }

    // 獲取競賽的參賽應用
    const competitionApps = await CompetitionService.getCompetitionApps(id);
    
    if (competitionApps.length === 0) {
      return NextResponse.json({
        success: true,
        message: '競賽參賽應用獲取成功',
        data: {
          competition,
          apps: [],
          total: 0
        }
      });
    }

    // 獲取應用的點讚和瀏覽數據
    const appService = new AppService();
    const appsWithStats = await Promise.all(
      competitionApps.map(async (app) => {
        try {
          const likes = await appService.getAppLikesCount(app.id);
          const views = await appService.getAppViewsCount(app.id);
          
          return {
            ...app,
            likes,
            views,
            competitionType: competition.type // 添加競賽類型
          };
        } catch (error) {
          console.error(`獲取應用 ${app.id} 統計數據失敗:`, error);
          return {
            ...app,
            likes: 0,
            views: 0,
            competitionType: competition.type
          };
        }
      })
    );

    // 過濾掉無效的應用
    const validApps = appsWithStats.filter(app => app !== null);

    // 應用篩選
    let filteredApps = validApps.filter(app => {
      const matchesSearch = search === '' || 
        app.name.toLowerCase().includes(search.toLowerCase()) ||
        app.description.toLowerCase().includes(search.toLowerCase()) ||
        app.creator_name?.toLowerCase().includes(search.toLowerCase());
      
      const matchesCategory = category === 'all' || app.category === category;
      const matchesType = type === 'all' || app.type === type;
      const matchesDepartment = department === 'all' || app.creator_department === department;
      const matchesCompetitionType = competitionType === 'all' || 
        (competitionType === 'individual' && app.competition_type === 'individual') ||
        (competitionType === 'team' && app.competition_type === 'team') ||
        (competitionType === 'proposal' && app.competition_type === 'proposal');

      return matchesSearch && matchesCategory && matchesType && matchesDepartment && matchesCompetitionType;
    });

    // 按人氣排序（按讚數）
    filteredApps.sort((a, b) => (b.likes || 0) - (a.likes || 0));

    return NextResponse.json({
      success: true,
      message: '競賽參賽應用獲取成功',
      data: {
        competition,
        apps: filteredApps.map(app => ({
          id: app.id,
          name: app.name,
          description: app.description,
          category: app.category,
          type: app.type,
          views: app.views || 0,
          likes: app.likes || 0,
          rating: app.rating || 0,
          creator: app.creator_name || '未知',
          department: app.creator_department || '未知',
          teamName: app.team_name || null,
          createdAt: app.created_at ? new Date(app.created_at).toLocaleDateString('zh-TW') : '-',
          icon: app.icon || 'Bot',
          iconColor: app.icon_color || 'from-blue-500 to-purple-500',
          competitionType: app.competitionType || 'individual'
        })),
        total: filteredApps.length
      }
    });

  } catch (error) {
    console.error('獲取競賽參賽應用失敗:', error);
    return NextResponse.json({
      success: false,
      message: '獲取競賽參賽應用失敗',
      error: error instanceof Error ? error.message : '未知錯誤'
    }, { status: 500 });
  }
}