package service

import (
	"context"

	"github.com/gochat/gochat/internal/model"
	"github.com/gochat/gochat/internal/repository"
)

// PushSubscriptionService provides business logic for managing push notification tokens.
// Reference: Chatwoot PushSubscription controller + P2B M8 spec
type PushSubscriptionService struct {
	pushTokenRepo *repository.PushTokenRepo
}

// NewPushSubscriptionService creates a new PushSubscription service with required dependencies.
func NewPushSubscriptionService(pushTokenRepo *repository.PushTokenRepo) *PushSubscriptionService {
	return &PushSubscriptionService{
		pushTokenRepo: pushTokenRepo,
	}
}

// ListPushTokens retrieves all push tokens for a user.
func (s *PushSubscriptionService) ListPushTokens(ctx context.Context, userID uint) ([]model.PushToken, error) {
	return s.pushTokenRepo.ListByUser(ctx, userID)
}

// RegisterPushToken creates a new push token for a user.
func (s *PushSubscriptionService) RegisterPushToken(ctx context.Context, userID uint, token string, platform string, deviceID string, p256dhKey string, authKey string) (*model.PushToken, error) {
	pt := &model.PushToken{
		UserID:    userID,
		Token:     token,
		Platform:  platform,
		DeviceID:  deviceID,
		P256DHKey: p256dhKey,
		AuthKey:   authKey,
	}
	err := s.pushTokenRepo.Create(ctx, pt)
	if err != nil {
		return nil, err
	}
	return pt, nil
}

// RemovePushToken deletes a push token by ID.
func (s *PushSubscriptionService) RemovePushToken(ctx context.Context, id uint) error {
	return s.pushTokenRepo.Delete(ctx, id)
}

// RemovePushTokenByValue deletes a push token by token string and user ID.
func (s *PushSubscriptionService) RemovePushTokenByValue(ctx context.Context, token string, userID uint) error {
	return s.pushTokenRepo.DeleteByTokenAndUser(ctx, token, userID)
}