// =====================================================
// 評審統計 API
// =====================================================

import { NextResponse } from 'next/server';
import { JudgeService } from '@/lib/services/database-service';

// 獲取評審統計
export async function GET() {
  try {
    const judges = await JudgeService.getAllJudges();
    
    // 計算統計數據
    const totalJudges = judges.length;
    const activeJudges = judges.filter(judge => judge.is_active).length;
    const inactiveJudges = judges.filter(judge => !judge.is_active).length;
    
    // 按部門統計
    const departmentStats = judges.reduce((acc, judge) => {
      const dept = judge.department || '未分類';
      if (!acc[dept]) {
        acc[dept] = { total: 0, active: 0, inactive: 0 };
      }
      acc[dept].total++;
      if (judge.is_active) {
        acc[dept].active++;
      } else {
        acc[dept].inactive++;
      }
      return acc;
    }, {} as Record<string, { total: number; active: number; inactive: number }>);
    
    // 按專業領域統計
    const expertiseStats = judges.reduce((acc, judge) => {
      judge.expertise.forEach(exp => {
        if (!acc[exp]) {
          acc[exp] = { total: 0, active: 0, inactive: 0 };
        }
        acc[exp].total++;
        if (judge.is_active) {
          acc[exp].active++;
        } else {
          acc[exp].inactive++;
        }
      });
      return acc;
    }, {} as Record<string, { total: number; active: number; inactive: number }>);
    
    const stats = {
      totalJudges,
      activeJudges,
      inactiveJudges,
      departmentStats,
      expertiseStats,
      lastUpdated: new Date().toISOString()
    };
    
    return NextResponse.json({
      success: true,
      message: '評審統計獲取成功',
      data: stats
    });

  } catch (error) {
    console.error('獲取評審統計失敗:', error);
    return NextResponse.json({
      success: false,
      message: '獲取評審統計失敗',
      error: error instanceof Error ? error.message : '未知錯誤'
    }, { status: 500 });
  }
}