// ===========================================
// 多班级版班级管理系统 - Go 后端
//
// 开发者: Canglan
// 联系方式: admin@sea-studio.top
// 版权归属: Sea Network Technology Studio
// 许可证: Apache License 2.0
//
// 版权所有 © Sea Network Technology Studio
// ===========================================

package service

import (
	"hz-gitea.sea-studio.top/canglan/SharedClassManager/internal/repository"
)

// RankingService 排行榜服务
type RankingService struct {
	studentRepo *repository.StudentRepo
	conductRepo *repository.ConductRepo
}

// NewRankingService 创建排行榜服务
func NewRankingService(
	studentRepo *repository.StudentRepo,
	conductRepo *repository.ConductRepo,
) *RankingService {
	return &RankingService{
		studentRepo: studentRepo,
		conductRepo: conductRepo,
	}
}

// GetRankings 获取排行榜
func (s *RankingService) GetRankings(classID int, rankType string, limit int) (map[string]interface{}, error) {
	switch rankType {
	case "attendance", "homework", "conduct":
		return s.getTypedRanking(classID, rankType, limit)
	default:
		// 默认按操行分总分排行
		ranking, err := s.studentRepo.GetRanking(classID, limit)
		if err != nil {
			return nil, err
		}
		totalStudents, _ := s.studentRepo.GetTotalCount(classID)
		return map[string]interface{}{
			"ranking":        ranking,
			"total_students": totalStudents,
			"type":           "all",
		}, nil
	}
}

// getTypedRanking 获取分项排行榜（使用 SQL 层聚合，避免全量加载）
func (s *RankingService) getTypedRanking(classID int, relatedType string, limit int) (map[string]interface{}, error) {
	dbType := relatedType
	if relatedType == "conduct" {
		dbType = "manual"
	}
	results, err := s.conductRepo.GetStudentPointsByType(classID, dbType, limit)
	if err != nil {
		return nil, err
	}

	var rankings []map[string]interface{}
	for _, r := range results {
		rankings = append(rankings, map[string]interface{}{
			"student_id": r.StudentID,
			"student_no": r.StudentNo,
			"name":       r.Name,
			"points":     r.TotalPoints,
		})
	}

	return map[string]interface{}{
		"ranking": rankings,
		"type":    relatedType,
	}, nil
}