package cart

import (
	"encoding/json"
	"fmt"

	messages "git.tornberg.me/go-cart-actor/pkg/messages"
	"google.golang.org/protobuf/proto"
)

func AddGiftcard(grain *CartGrain, req *messages.AddGiftcard) error {
	if req.Giftcard == nil {
		return fmt.Errorf("giftcard cannot be nil")
	}
	if req.Giftcard.Value <= 0 {
		return fmt.Errorf("giftcard value must be positive")
	}
	grain.lastGiftcardId++
	designConfig := json.RawMessage{}
	if req.Giftcard.DesignConfig != nil {
		// Convert Any to RawMessage
		data, err := proto.Marshal(req.Giftcard.DesignConfig)
		if err != nil {
			return fmt.Errorf("failed to marshal designConfig: %w", err)
		}
		designConfig = data
	}
	value := NewPriceFromIncVat(req.Giftcard.Value, 25) // Assuming 25% tax; adjust as needed
	item := &GiftcardItem{
		Id:            grain.lastGiftcardId,
		Value:         *value,
		DeliveryDate:  req.Giftcard.DeliveryDate,
		Recipient:     req.Giftcard.Recipient,
		RecipientType: req.Giftcard.RecipientType,
		Message:       req.Giftcard.Message,
		DesignConfig:  designConfig,
	}
	grain.Giftcards = append(grain.Giftcards, item)
	grain.UpdateTotals()
	return nil
}