package repository

import (
	"dianshang/internal/model"
	"gorm.io/gorm"
)

// PointsRepository 积分数据访问层
type PointsRepository struct {
	db *gorm.DB
}

// NewPointsRepository 创建积分数据访问层
func NewPointsRepository(db *gorm.DB) *PointsRepository {
	return &PointsRepository{db: db}
}

// GetUserPoints 获取用户积分
func (r *PointsRepository) GetUserPoints(userID uint) (int, error) {
	var user model.User
	err := r.db.Select("points").Where("id = ?", userID).First(&user).Error
	if err != nil {
		return 0, err
	}
	return user.Points, nil
}

// UpdateUserPoints 更新用户积分
func (r *PointsRepository) UpdateUserPoints(userID uint, points int) error {
	return r.db.Model(&model.User{}).Where("id = ?", userID).Update("points", points).Error
}

// CreatePointsHistory 创建积分历史记录
func (r *PointsRepository) CreatePointsHistory(history *model.PointsHistory) error {
	return r.db.Create(history).Error
}

// GetPointsHistory 获取积分历史记录
func (r *PointsRepository) GetPointsHistory(userID uint, page, pageSize int) ([]model.PointsHistory, int64, error) {
	var histories []model.PointsHistory
	var total int64
	
	offset := (page - 1) * pageSize
	
	// 获取总数
	err := r.db.Model(&model.PointsHistory{}).Where("user_id = ?", userID).Count(&total).Error
	if err != nil {
		return nil, 0, err
	}
	
	// 获取分页数据
	err = r.db.Where("user_id = ?", userID).
		Order("created_at DESC").
		Offset(offset).
		Limit(pageSize).
		Find(&histories).Error
	
	return histories, total, err
}

// GetPointsRules 获取积分规则列表
func (r *PointsRepository) GetPointsRules() ([]model.PointsRule, error) {
	var rules []model.PointsRule
	err := r.db.Where("status = ?", 1).Order("sort ASC, id ASC").Find(&rules).Error
	return rules, err
}

// GetPointsExchangeList 获取积分兑换商品列表
func (r *PointsRepository) GetPointsExchangeList() ([]model.PointsExchange, error) {
	var exchanges []model.PointsExchange
	err := r.db.Where("status = ?", 1).Order("sort ASC, id ASC").Find(&exchanges).Error
	return exchanges, err
}

// GetPointsExchangeByID 根据ID获取积分兑换商品
func (r *PointsRepository) GetPointsExchangeByID(id uint) (*model.PointsExchange, error) {
	var exchange model.PointsExchange
	err := r.db.Where("id = ? AND status = ?", id, 1).First(&exchange).Error
	if err != nil {
		return nil, err
	}
	return &exchange, nil
}

// CreatePointsExchangeRecord 创建积分兑换记录
func (r *PointsRepository) CreatePointsExchangeRecord(record *model.PointsExchangeRecord) error {
	return r.db.Create(record).Error
}

// UpdatePointsExchangeCount 更新兑换商品的兑换次数
func (r *PointsRepository) UpdatePointsExchangeCount(id uint) error {
	return r.db.Model(&model.PointsExchange{}).Where("id = ?", id).
		UpdateColumn("exchange_count", gorm.Expr("exchange_count + ?", 1)).Error
}

// GetUserExchangeRecords 获取用户兑换记录
func (r *PointsRepository) GetUserExchangeRecords(userID uint, page, pageSize int) ([]model.PointsExchangeRecord, int64, error) {
	var records []model.PointsExchangeRecord
	var total int64
	
	offset := (page - 1) * pageSize
	
	// 获取总数
	err := r.db.Model(&model.PointsExchangeRecord{}).Where("user_id = ?", userID).Count(&total).Error
	if err != nil {
		return nil, 0, err
	}
	
	// 获取分页数据，预加载关联数据
	err = r.db.Preload("PointsExchange").
		Where("user_id = ?", userID).
		Order("created_at DESC").
		Offset(offset).
		Limit(pageSize).
		Find(&records).Error
	
	return records, total, err
}