init: radio init commit

service/radio/subscription_service.go

@@ -0,0 +1,144 @@
+package radio
+
+import (
+	"errors"
+	"sundynix-go/global"
+	common "sundynix-go/model/commom/request"
+	"sundynix-go/model/radio"
+	"time"
+
+	"gorm.io/gorm"
+)
+
+type SubscriptionService struct{}
+
+const MaxFreeSubscription = 2
+
+// GetUserSubscription 获取用户订阅列表
+func (s *SubscriptionService) GetUserSubscription(userId string, info common.PageInfo) ([]radio.RadioSubscription, int64, error) {
+	db := global.DB.Model(&radio.RadioSubscription{}).Where("user_id = ?", userId)
+	var list []radio.RadioSubscription
+	var total int64
+
+	err := db.Count(&total).Error
+	if err != nil {
+		return nil, 0, err
+	}
+
+	offset := (info.Current - 1) * info.PageSize
+	err = db.Offset(offset).Limit(info.PageSize).Order("created_at DESC").Find(&list).Error
+	return list, total, err
+}
+
+// GetUserSubscriptionHistory 获取用户历史订阅过的频道ID列表
+func (s *SubscriptionService) GetUserSubscriptionHistory(userId string) ([]string, error) {
+	var channelIds []string
+	err := global.DB.Model(&radio.RadioSubscription{}).
+		Where("user_id = ?", userId).
+		Pluck("channel_id", &channelIds).Error
+	return channelIds, err
+}
+
+// HasEverSubscribed 检查用户是否曾经订阅过该频道（包括已取消的）
+func (s *SubscriptionService) HasEverSubscribed(userId, channelId string) (bool, error) {
+	var count int64
+	// 使用Unscoped查询包括已软删除的记录
+	err := global.DB.Unscoped().Model(&radio.RadioSubscription{}).
+		Where("user_id = ? AND channel_id = ?", userId, channelId).
+		Count(&count).Error
+	return count > 0, err
+}
+
+// HasSubscription 检查用户当前是否订阅该频道（未取消的）
+func (s *SubscriptionService) HasSubscription(userId, channelId string) (bool, error) {
+	var count int64
+	err := global.DB.Model(&radio.RadioSubscription{}).
+		Where("user_id = ? AND channel_id = ?", userId, channelId).
+		Count(&count).Error
+	return count > 0, err
+}
+
+// CanSubscribe 检查是否可以订阅
+// 规则：
+// 1. 如果用户是VIP且未过期，可以订阅任意频道
+// 2. 如果用户曾经订阅过该频道（取消后再订阅），可以免费订阅
+// 3. 否则检查当前有效订阅数量是否达到上限(2个)
+func (s *SubscriptionService) CanSubscribe(userId, channelId string) (bool, string, error) {
+	// 检查是否已经是订阅用户（未取消的订阅）
+	var existing radio.RadioSubscription
+	err := global.DB.Where("user_id = ? AND channel_id = ?", userId, channelId).First(&existing).Error
+	if err == nil {
+		return false, "您已订阅该频道", nil
+	}
+	if !errors.Is(err, gorm.ErrRecordNotFound) {
+		return false, "", err
+	}
+
+	// 获取radio_user检查VIP状态
+	var radioUser radio.RadioUser
+	err = global.DB.Where("user_id = ?", userId).First(&radioUser).Error
+	if err == nil && radioUser.IsVip == 1 {
+		// 检查VIP是否过期
+		if radioUser.VipExpireAt != nil && *radioUser.VipExpireAt > time.Now().Unix() {
+			return true, "", nil
+		}
+	}
+
+	// 检查用户是否曾经订阅过该频道（取消后又订阅的情况）
+	hasEverSubscribed, err := s.HasEverSubscribed(userId, channelId)
+	if err != nil {
+		return false, "", err
+	}
+	if hasEverSubscribed {
+		// 曾今订阅过，可以免费再次订阅
+		return true, "", nil
+	}
+
+	// 非VIP用户，检查当前有效订阅数量（排除已取消的）
+	var count int64
+	err = global.DB.Model(&radio.RadioSubscription{}).Where("user_id = ?", userId).Count(&count).Error
+	if err != nil {
+		return false, "", err
+	}
+	if count >= MaxFreeSubscription {
+		return false, "免费订阅数量已达上限(2个)，请开通VIP或订阅付费频道", nil
+	}
+
+	return true, "", nil
+}
+
+// Subscribe 订阅频道
+func (s *SubscriptionService) Subscribe(userId, channelId string, subType int) error {
+	subscription := radio.RadioSubscription{
+		UserId:    userId,
+		ChannelId: channelId,
+	}
+	return global.DB.Create(&subscription).Error
+}
+
+// Unsubscribe 退订频道（逻辑删除，更新删除时间表示已取消）
+func (s *SubscriptionService) Unsubscribe(userId, channelId string) error {
+	// 软删除：将DeletedAt设置为当前时间，表示已取消订阅
+	// 这样用户可以再次免费订阅该频道
+	return global.DB.Model(&radio.RadioSubscription{}).
+		Where("user_id = ? AND channel_id = ?", userId, channelId).
+		Update("deleted_at", time.Now()).Error
+}
+
+// GetVipStatus 获取VIP状态
+func (s *SubscriptionService) GetVipStatus(userId string) (bool, int64, error) {
+	var radioUser radio.RadioUser
+	err := global.DB.Where("user_id = ?", userId).First(&radioUser).Error
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return false, 0, nil
+		}
+		return false, 0, err
+	}
+
+	if radioUser.IsVip == 1 && radioUser.VipExpireAt != nil && *radioUser.VipExpireAt > time.Now().Unix() {
+		return true, *radioUser.VipExpireAt, nil
+	}
+
+	return false, 0, nil
+}