package validator

import (
	"fmt"

	"apskel-pos-be/internal/constants"
	"apskel-pos-be/internal/contract"
)

type NotificationValidator interface {
	ValidateSendRequest(req *contract.SendNotificationRequest) (error, string)
	ValidateBroadcastRequest(req *contract.BroadcastNotificationRequest) (error, string)
	ValidateListRequest(req *contract.ListNotificationsRequest) (error, string)
}

type NotificationValidatorImpl struct{}

func NewNotificationValidator() *NotificationValidatorImpl {
	return &NotificationValidatorImpl{}
}

func (v *NotificationValidatorImpl) ValidateSendRequest(req *contract.SendNotificationRequest) (error, string) {
	if req.Title == "" {
		return fmt.Errorf("title is required"), constants.MissingFieldErrorCode
	}
	if req.Body == "" {
		return fmt.Errorf("body is required"), constants.MissingFieldErrorCode
	}
	if len(req.ReceiverIDs) == 0 {
		return fmt.Errorf("at least one receiver_id is required"), constants.MissingFieldErrorCode
	}
	return nil, ""
}

func (v *NotificationValidatorImpl) ValidateBroadcastRequest(req *contract.BroadcastNotificationRequest) (error, string) {
	if req.Title == "" {
		return fmt.Errorf("title is required"), constants.MissingFieldErrorCode
	}
	if req.Body == "" {
		return fmt.Errorf("body is required"), constants.MissingFieldErrorCode
	}
	return nil, ""
}

func (v *NotificationValidatorImpl) ValidateListRequest(req *contract.ListNotificationsRequest) (error, string) {
	if req.Page < 1 {
		return fmt.Errorf("page must be greater than 0"), constants.ValidationErrorCode
	}
	if req.Limit < 1 || req.Limit > 100 {
		return fmt.Errorf("limit must be between 1 and 100"), constants.ValidationErrorCode
	}
	return nil, ""
}