// ===========================================
// 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 (
	"fmt"

	"hz-gitea.sea-studio.top/canglan/SharedClassManager/internal/model"
	"hz-gitea.sea-studio.top/canglan/SharedClassManager/internal/repository"
	"hz-gitea.sea-studio.top/canglan/SharedClassManager/pkg/logger"
)

// SubjectService 科目服务
type SubjectService struct {
	subjectRepo *repository.SubjectRepo
}

// NewSubjectService 创建科目服务
func NewSubjectService(subjectRepo *repository.SubjectRepo) *SubjectService {
	return &SubjectService{subjectRepo: subjectRepo}
}

// GetSubjects 获取科目列表
func (s *SubjectService) GetSubjects(isActive *bool) (map[string]interface{}, error) {
	subjects, err := s.subjectRepo.GetAll(isActive)
	if err != nil {
		return nil, err
	}
	return map[string]interface{}{
		"subjects": subjects,
		"total":    len(subjects),
	}, nil
}

// CreateSubject 创建科目
func (s *SubjectService) CreateSubject(subjectName string, subjectCode *string, sortOrder int) (map[string]interface{}, error) {
	existing, _ := s.subjectRepo.GetByName(subjectName)
	if existing != nil {
		return map[string]interface{}{"success": false, "message": "科目名称已存在"}, nil
	}

	subject := &model.Subject{
		SubjectName: subjectName,
		SubjectCode: subjectCode,
		SortOrder:   sortOrder,
		IsActive:    1,
	}

	subjectID, err := s.subjectRepo.Create(subject)
	if err != nil {
		return nil, err
	}

	logger.Sugared.Infof("创建科目: %s", subjectName)
	return map[string]interface{}{
		"success":     true,
		"subject_id":  subjectID,
	}, nil
}

// UpdateSubject 更新科目
func (s *SubjectService) UpdateSubject(subjectID int, updates map[string]interface{}) error {
	return s.subjectRepo.Update(subjectID, updates)
}

// DisableSubject 禁用科目（将 is_active 设为 0，保留数据）
func (s *SubjectService) DisableSubject(subjectID int) error {
	return s.subjectRepo.Update(subjectID, map[string]interface{}{"is_active": 0})
}

// EnableSubject 启用科目（将 is_active 设为 1）
func (s *SubjectService) EnableSubject(subjectID int) error {
	return s.subjectRepo.Update(subjectID, map[string]interface{}{"is_active": 1})
}

// DeleteSubject 物理删除科目（需先检查关联数据）
func (s *SubjectService) DeleteSubject(subjectID int) error {
	hasData, _ := s.subjectRepo.HasRelatedData(subjectID)
	if hasData {
		return fmt.Errorf("该科目下已有作业数据，无法删除")
	}
	return s.subjectRepo.Delete(subjectID)
}