// ===========================================
// 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 repository

import (
	"time"

	"gorm.io/gorm"

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

// UserRepo 用户数据访问层
type UserRepo struct {
	db *gorm.DB
}

// NewUserRepo 创建用户 Repository
func NewUserRepo(db *gorm.DB) *UserRepo {
	return &UserRepo{db: db}
}

// GetByUsername 根据用户名获取用户（含状态过滤）
func (r *UserRepo) GetByUsername(username string) (*model.User, error) {
	var user model.User
	if err := r.db.Where("username = ? AND status = 1", username).First(&user).Error; err != nil {
		return nil, err
	}
	return &user, nil
}

// GetByUserID 根据用户ID获取用户
func (r *UserRepo) GetByUserID(userID int) (*model.User, error) {
	var user model.User
	if err := r.db.Where("user_id = ?", userID).First(&user).Error; err != nil {
		return nil, err
	}
	return &user, nil
}

// CreateStudent 创建学生账号
func (r *UserRepo) CreateStudent(username, passwordHash, realName string, studentID int) (int, error) {
	user := model.User{
		Username:           username,
		PasswordHash:       passwordHash,
		RealName:           realName,
		UserType:           "student",
		StudentID:          &studentID,
		Status:             1,
		NeedChangePassword: 1,
	}
	if err := r.db.Create(&user).Error; err != nil {
		return 0, err
	}
	return user.UserID, nil
}

// CreateParent 创建家长账号
func (r *UserRepo) CreateParent(username, passwordHash, realName string, studentID int) (int, error) {
	user := model.User{
		Username:           username,
		PasswordHash:       passwordHash,
		RealName:           realName,
		UserType:           "parent",
		StudentID:          &studentID,
		Status:             1,
		NeedChangePassword: 0,
	}
	if err := r.db.Create(&user).Error; err != nil {
		return 0, err
	}
	return user.UserID, nil
}

// CreateAdmin 创建管理员账号
func (r *UserRepo) CreateAdmin(username, passwordHash, realName string) (int, error) {
	user := model.User{
		Username:           username,
		PasswordHash:       passwordHash,
		RealName:           realName,
		UserType:           "admin",
		Status:             1,
		NeedChangePassword: 1,
	}
	if err := r.db.Create(&user).Error; err != nil {
		return 0, err
	}
	return user.UserID, nil
}

// UpdatePassword 更新密码并清除强制改密标记
func (r *UserRepo) UpdatePassword(userID int, passwordHash string) error {
	return r.db.Model(&model.User{}).
		Where("user_id = ?", userID).
		Updates(map[string]interface{}{
			"password_hash":        passwordHash,
			"need_change_password": 0,
		}).Error
}

// UpdateLastLogin 更新最后登录信息
func (r *UserRepo) UpdateLastLogin(userID int, ip string) error {
	return r.db.Model(&model.User{}).
		Where("user_id = ?", userID).
		Updates(map[string]interface{}{
			"last_login_time": time.Now(),
			"last_login_ip":   ip,
		}).Error
}

// CheckUsernameExists 检查用户名是否存在
func (r *UserRepo) CheckUsernameExists(username string) (bool, error) {
	var count int64
	if err := r.db.Model(&model.User{}).Where("username = ?", username).Count(&count).Error; err != nil {
		return false, err
	}
	return count > 0, nil
}

// UpdateStatus 更新用户状态
func (r *UserRepo) UpdateStatus(userID int, status int8) error {
	return r.db.Model(&model.User{}).
		Where("user_id = ?", userID).
		Update("status", status).Error
}

// UpdateRealName 更新用户真实姓名
func (r *UserRepo) UpdateRealName(userID int, realName string) error {
	return r.db.Model(&model.User{}).
		Where("user_id = ?", userID).
		Update("real_name", realName).Error
}

// GetByStudentID 根据学生ID获取关联的用户账号
func (r *UserRepo) GetByStudentID(studentID int) (*model.User, error) {
	var user model.User
	if err := r.db.Where("student_id = ? AND status = 1", studentID).First(&user).Error; err != nil {
		return nil, err
	}
	return &user, nil
}

// DeleteUser 硬删除用户记录
func (r *UserRepo) DeleteUser(userID int) error {
	return r.db.Unscoped().Where("user_id = ?", userID).Delete(&model.User{}).Error
}

// GetActiveUsernames 获取所有活跃用户的用户名列表（用于批量导入去重）
func (r *UserRepo) GetActiveUsernames() ([]string, error) {
	var usernames []string
	if err := r.db.Model(&model.User{}).
		Where("status = 1").
		Pluck("username", &usernames).Error; err != nil {
		return nil, err
	}
	return usernames, nil
}