// =====================================================
// 競賽管理 API
// =====================================================

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

// 獲取所有競賽
export async function GET(request: NextRequest) {
  try {
    const competitions = await CompetitionService.getAllCompetitions();
    
    // 為每個競賽獲取關聯數據
    const competitionsWithDetails = await Promise.all(
      competitions.map(async (competition) => {
        try {
          const fullCompetition = await CompetitionService.getCompetitionWithDetails(competition.id);
          return fullCompetition;
        } catch (error) {
          console.error(`獲取競賽 ${competition.id} 詳細信息失敗:`, error);
          return competition; // 如果獲取詳細信息失敗，返回基本競賽信息
        }
      })
    );
    
    return NextResponse.json({
      success: true,
      message: '競賽列表獲取成功',
      data: competitionsWithDetails
    });

  } catch (error) {
    console.error('獲取競賽列表失敗:', error);
    return NextResponse.json({
      success: false,
      message: '獲取競賽列表失敗',
      error: error instanceof Error ? error.message : '未知錯誤'
    }, { status: 500 });
  }
}

// 創建新競賽
export async function POST(request: NextRequest) {
  try {
    const body = await request.json();
    const {
      name,
      year,
      month,
      startDate,
      endDate,
      status = 'upcoming',
      description,
      type = 'individual',
      evaluationFocus,
      maxTeamSize,
      isActive = true,
      // 關聯數據
      judges = [],
      teams = [],
      awardTypes = [],
      rules = []
    } = body;

    // 驗證必填欄位
    if (!name || !year || !month || !startDate || !endDate || !type) {
      return NextResponse.json({
        success: false,
        message: '缺少必填欄位',
        error: 'name, year, month, startDate, endDate, type 為必填欄位'
      }, { status: 400 });
    }

    // 驗證日期格式
    const startDateObj = new Date(startDate);
    const endDateObj = new Date(endDate);
    
    if (isNaN(startDateObj.getTime()) || isNaN(endDateObj.getTime())) {
      return NextResponse.json({
        success: false,
        message: '日期格式無效',
        error: 'startDate 和 endDate 必須是有效的日期格式'
      }, { status: 400 });
    }

    // 驗證結束日期不能早於開始日期
    if (endDateObj <= startDateObj) {
      return NextResponse.json({
        success: false,
        message: '結束日期不能早於或等於開始日期',
        error: 'endDate 必須晚於 startDate'
      }, { status: 400 });
    }

    // 驗證競賽類型
    const validTypes = ['individual', 'team', 'mixed', 'proposal'];
    if (!validTypes.includes(type)) {
      return NextResponse.json({
        success: false,
        message: '無效的競賽類型',
        error: `type 必須是以下之一: ${validTypes.join(', ')}`
      }, { status: 400 });
    }

    // 驗證狀態
    const validStatuses = ['upcoming', 'active', 'judging', 'completed'];
    if (!validStatuses.includes(status)) {
      return NextResponse.json({
        success: false,
        message: '無效的競賽狀態',
        error: `status 必須是以下之一: ${validStatuses.join(', ')}`
      }, { status: 400 });
    }

    // 創建競賽
    const competitionData = {
      name,
      year: parseInt(year),
      month: parseInt(month),
      start_date: startDate,
      end_date: endDate,
      status,
      description: description || null,
      type,
      evaluation_focus: evaluationFocus || null,
      max_team_size: maxTeamSize ? parseInt(maxTeamSize) : null,
      is_active: isActive
    };

    const newCompetition = await CompetitionService.createCompetition(competitionData);

    // 保存關聯數據
    if (newCompetition) {
      try {
        // 保存評審關聯
        if (judges && judges.length > 0) {
          await CompetitionService.addCompetitionJudges(newCompetition.id, judges);
        }

        // 保存團隊關聯
        if (teams && teams.length > 0) {
          await CompetitionService.addCompetitionTeams(newCompetition.id, teams);
        }

        // 保存獎項類型
        if (awardTypes && awardTypes.length > 0) {
          await CompetitionService.addCompetitionAwardTypes(newCompetition.id, awardTypes);
        }

        // 保存評分規則
        if (rules && rules.length > 0) {
          await CompetitionService.addCompetitionRules(newCompetition.id, rules);
        }

        // 獲取完整的競賽信息（包含關聯數據）
        const fullCompetition = await CompetitionService.getCompetitionWithDetails(newCompetition.id);

        return NextResponse.json({
          success: true,
          message: '競賽創建成功',
          data: fullCompetition
        });
      } catch (error) {
        console.error('保存競賽關聯數據失敗:', error);
        // 即使關聯數據保存失敗，競賽本身已經創建成功
        return NextResponse.json({
          success: true,
          message: '競賽創建成功，但部分關聯數據保存失敗',
          data: newCompetition,
          warning: '部分關聯數據可能未正確保存，請檢查資料庫狀態'
        });
      }
    }

    return NextResponse.json({
      success: false,
      message: '競賽創建失敗',
      error: '無法創建競賽'
    }, { status: 500 });

  } catch (error) {
    console.error('創建競賽失敗:', error);
    return NextResponse.json({
      success: false,
      message: '創建競賽失敗',
      error: error instanceof Error ? error.message : '未知錯誤'
    }, { status: 500 });
  }
}