package repository

import (
	"dianshang/internal/model"
	"time"

	"gorm.io/gorm"
)

// BannerRepository 轮播图仓储
type BannerRepository struct {
	db *gorm.DB
}

// NewBannerRepository 创建轮播图仓储
func NewBannerRepository(db *gorm.DB) *BannerRepository {
	return &BannerRepository{db: db}
}

// GetActiveBanners 获取有效的轮播图
func (r *BannerRepository) GetActiveBanners() ([]model.Banner, error) {
	var banners []model.Banner
	err := r.db.Where("status = ?", 1).Order("sort ASC").Find(&banners).Error
	return banners, err
}

// GetBannerList 获取轮播图列表（分页）
func (r *BannerRepository) GetBannerList(page, pageSize int, status *int) ([]model.Banner, int64, error) {
	var banners []model.Banner
	var total int64
	
	query := r.db.Model(&model.Banner{})
	
	// 状态筛选
	if status != nil {
		query = query.Where("status = ?", *status)
	}
	
	// 获取总数
	if err := query.Count(&total).Error; err != nil {
		return nil, 0, err
	}
	
	// 分页查询
	offset := (page - 1) * pageSize
	err := query.Order("sort ASC, created_at DESC").
		Offset(offset).
		Limit(pageSize).
		Find(&banners).Error
	
	return banners, total, err
}

// GetBannerByID 根据ID获取轮播图
func (r *BannerRepository) GetBannerByID(id uint) (*model.Banner, error) {
	var banner model.Banner
	err := r.db.First(&banner, id).Error
	if err != nil {
		return nil, err
	}
	return &banner, nil
}

// CreateBanner 创建轮播图
func (r *BannerRepository) CreateBanner(banner *model.Banner) error {
	return r.db.Create(banner).Error
}

// UpdateBanner 更新轮播图
func (r *BannerRepository) UpdateBanner(banner *model.Banner) error {
	return r.db.Save(banner).Error
}

// DeleteBanner 删除轮播图
func (r *BannerRepository) DeleteBanner(id uint) error {
	return r.db.Delete(&model.Banner{}, id).Error
}

// BatchDeleteBanners 批量删除轮播图
func (r *BannerRepository) BatchDeleteBanners(ids []uint) error {
	return r.db.Delete(&model.Banner{}, ids).Error
}

// UpdateBannerStatus 更新轮播图状态
func (r *BannerRepository) UpdateBannerStatus(id uint, status int) error {
	return r.db.Model(&model.Banner{}).Where("id = ?", id).Update("status", status).Error
}

// BatchUpdateBannerStatus 批量更新轮播图状态
func (r *BannerRepository) BatchUpdateBannerStatus(ids []uint, status int) error {
	return r.db.Model(&model.Banner{}).Where("id IN ?", ids).Update("status", status).Error
}

// UpdateBannerSort 更新轮播图排序
func (r *BannerRepository) UpdateBannerSort(id uint, sort int) error {
	return r.db.Model(&model.Banner{}).Where("id = ?", id).Update("sort", sort).Error
}

// BatchUpdateBannerSort 批量更新轮播图排序
func (r *BannerRepository) BatchUpdateBannerSort(sortData []map[string]interface{}) error {
	return r.db.Transaction(func(tx *gorm.DB) error {
		for _, data := range sortData {
			if err := tx.Model(&model.Banner{}).
				Where("id = ?", data["id"]).
				Update("sort", data["sort"]).Error; err != nil {
				return err
			}
		}
		return nil
	})
}

// GetBannersByDateRange 根据日期范围获取轮播图
func (r *BannerRepository) GetBannersByDateRange(startDate, endDate time.Time) ([]model.Banner, error) {
	var banners []model.Banner
	err := r.db.Where("created_at BETWEEN ? AND ?", startDate, endDate).
		Order("sort ASC, created_at DESC").
		Find(&banners).Error
	return banners, err
}

// GetBannersByStatus 根据状态获取轮播图
func (r *BannerRepository) GetBannersByStatus(status int) ([]model.Banner, error) {
	var banners []model.Banner
	err := r.db.Where("status = ?", status).
		Order("sort ASC, created_at DESC").
		Find(&banners).Error
	return banners, err
}

// GetBannerCount 获取轮播图总数
func (r *BannerRepository) GetBannerCount() (int64, error) {
	var count int64
	err := r.db.Model(&model.Banner{}).Count(&count).Error
	return count, err
}

// GetBannerCountByStatus 根据状态获取轮播图数量
func (r *BannerRepository) GetBannerCountByStatus(status int) (int64, error) {
	var count int64
	err := r.db.Model(&model.Banner{}).Where("status = ?", status).Count(&count).Error
	return count, err
}

// GetMaxSort 获取最大排序值
func (r *BannerRepository) GetMaxSort() (int, error) {
	var maxSort int
	err := r.db.Model(&model.Banner{}).Select("COALESCE(MAX(sort), 0)").Scan(&maxSort).Error
	return maxSort, err
}

// CheckBannerExists 检查轮播图是否存在
func (r *BannerRepository) CheckBannerExists(id uint) (bool, error) {
	var count int64
	err := r.db.Model(&model.Banner{}).Where("id = ?", id).Count(&count).Error
	return count > 0, err
}

// GetExpiredBanners 获取过期的轮播图
func (r *BannerRepository) GetExpiredBanners() ([]model.Banner, error) {
	var banners []model.Banner
	now := time.Now()
	err := r.db.Where("end_time IS NOT NULL AND end_time < ? AND status = 1", now).
		Find(&banners).Error
	return banners, err
}

// GetActiveBannersWithTimeRange 获取在时间范围内有效的轮播图
func (r *BannerRepository) GetActiveBannersWithTimeRange() ([]model.Banner, error) {
	var banners []model.Banner
	now := time.Now()
	err := r.db.Where("status = 1").
		Where("(start_time IS NULL OR start_time <= ?)"+
			" AND (end_time IS NULL OR end_time >= ?)", now, now).
		Order("sort ASC").
		Find(&banners).Error
	return banners, err
}