feat(notifications): align subscription payloads

internal/repository/notification_subscription_repo.go

@@ -2,6 +2,7 @@ package repository
 
 import (
 	"context"
+	"encoding/json"
 
 	"github.com/gochat/gochat/internal/model"
 	"gorm.io/gorm"
@@ -21,6 +22,11 @@ func (r *NotificationSubscriptionRepo) Create(ctx context.Context, sub *model.No
 	return r.db.WithContext(ctx).Create(sub).Error
 }
 
+// Save inserts or updates a subscription.
+func (r *NotificationSubscriptionRepo) Save(ctx context.Context, sub *model.NotificationSubscription) error {
+	return r.db.WithContext(ctx).Save(sub).Error
+}
+
 // FindByID retrieves a subscription by ID.
 func (r *NotificationSubscriptionRepo) FindByID(ctx context.Context, id uint) (*model.NotificationSubscription, error) {
 	var sub model.NotificationSubscription
@@ -35,6 +41,29 @@ func (r *NotificationSubscriptionRepo) FindByUserID(ctx context.Context, userID
 	return subs, err
 }
 
+// FindByUserIDAndPushToken finds the Chatwoot destroy target by push_token.
+func (r *NotificationSubscriptionRepo) FindByUserIDAndPushToken(ctx context.Context, userID uint, pushToken string) (*model.NotificationSubscription, error) {
+	subs, err := r.FindByUserID(ctx, userID)
+	if err != nil {
+		return nil, err
+	}
+	for i := range subs {
+		if subs[i].Identifier == pushToken {
+			return &subs[i], nil
+		}
+		var attrs map[string]any
+		if err := json.Unmarshal(subs[i].SubscriptionAttributes, &attrs); err == nil {
+			if value, _ := attrs["push_token"].(string); value == pushToken {
+				return &subs[i], nil
+			}
+			if value, _ := attrs["endpoint"].(string); value == pushToken {
+				return &subs[i], nil
+			}
+		}
+	}
+	return nil, gorm.ErrRecordNotFound
+}
+
 // FindByIdentifier retrieves a subscription by its unique identifier.
 func (r *NotificationSubscriptionRepo) FindByIdentifier(ctx context.Context, identifier string) (*model.NotificationSubscription, error) {
 	var sub model.NotificationSubscription
@@ -52,4 +81,4 @@ func (r *NotificationSubscriptionRepo) DeleteByUserIDAndIdentifier(ctx context.C
 	return r.db.WithContext(ctx).
 		Where("user_id = ? AND identifier = ?", userID, identifier).
 		Delete(&model.NotificationSubscription{}).Error
-}
+}