package repository

import (
	"context"

	"apskel-pos-be/internal/entities"

	"github.com/google/uuid"
	"gorm.io/gorm"
)

type NotificationReceiverRepository interface {
	Create(ctx context.Context, receiver *entities.NotificationReceiver) error
	BulkCreate(ctx context.Context, receivers []*entities.NotificationReceiver) error
	GetByID(ctx context.Context, id uuid.UUID) (*entities.NotificationReceiver, error)
	GetByNotificationAndUser(ctx context.Context, notificationID, userID uuid.UUID) (*entities.NotificationReceiver, error)
	Update(ctx context.Context, receiver *entities.NotificationReceiver) error
	ListByUserID(ctx context.Context, userID uuid.UUID, isRead *bool, limit, offset int) ([]*entities.NotificationReceiver, int64, error)
	CountUnreadByUserID(ctx context.Context, userID uuid.UUID) (int64, error)
	SoftDeleteByID(ctx context.Context, id uuid.UUID) error
}

type NotificationReceiverRepositoryImpl struct {
	db *gorm.DB
}

func NewNotificationReceiverRepository(db *gorm.DB) *NotificationReceiverRepositoryImpl {
	return &NotificationReceiverRepositoryImpl{db: db}
}

func (r *NotificationReceiverRepositoryImpl) Create(ctx context.Context, receiver *entities.NotificationReceiver) error {
	return r.db.WithContext(ctx).Create(receiver).Error
}

func (r *NotificationReceiverRepositoryImpl) BulkCreate(ctx context.Context, receivers []*entities.NotificationReceiver) error {
	if len(receivers) == 0 {
		return nil
	}
	return r.db.WithContext(ctx).Create(&receivers).Error
}

func (r *NotificationReceiverRepositoryImpl) GetByID(ctx context.Context, id uuid.UUID) (*entities.NotificationReceiver, error) {
	var receiver entities.NotificationReceiver
	err := r.db.WithContext(ctx).
		Preload("Notification").
		First(&receiver, "id = ? AND is_deleted = false", id).Error
	if err != nil {
		return nil, err
	}
	return &receiver, nil
}

func (r *NotificationReceiverRepositoryImpl) GetByNotificationAndUser(ctx context.Context, notificationID, userID uuid.UUID) (*entities.NotificationReceiver, error) {
	var receiver entities.NotificationReceiver
	err := r.db.WithContext(ctx).
		Where("notification_id = ? AND user_id = ? AND is_deleted = false", notificationID, userID).
		First(&receiver).Error
	if err != nil {
		return nil, err
	}
	return &receiver, nil
}

func (r *NotificationReceiverRepositoryImpl) Update(ctx context.Context, receiver *entities.NotificationReceiver) error {
	return r.db.WithContext(ctx).Save(receiver).Error
}

func (r *NotificationReceiverRepositoryImpl) ListByUserID(ctx context.Context, userID uuid.UUID, isRead *bool, limit, offset int) ([]*entities.NotificationReceiver, int64, error) {
	var receivers []*entities.NotificationReceiver
	var total int64

	query := r.db.WithContext(ctx).
		Model(&entities.NotificationReceiver{}).
		Where("user_id = ? AND is_deleted = false", userID)

	if isRead != nil {
		query = query.Where("is_read = ?", *isRead)
	}

	if err := query.Count(&total).Error; err != nil {
		return nil, 0, err
	}

	err := query.
		Preload("Notification").
		Order("created_at DESC").
		Limit(limit).
		Offset(offset).
		Find(&receivers).Error

	return receivers, total, err
}

func (r *NotificationReceiverRepositoryImpl) CountUnreadByUserID(ctx context.Context, userID uuid.UUID) (int64, error) {
	var count int64
	err := r.db.WithContext(ctx).
		Model(&entities.NotificationReceiver{}).
		Where("user_id = ? AND is_read = false AND is_deleted = false", userID).
		Count(&count).Error
	return count, err
}

func (r *NotificationReceiverRepositoryImpl) SoftDeleteByID(ctx context.Context, id uuid.UUID) error {
	return r.db.WithContext(ctx).
		Model(&entities.NotificationReceiver{}).
		Where("id = ?", id).
		Updates(map[string]interface{}{"is_deleted": true}).Error
}