package grpc

import (
	"context"

	walletv1 "hyapp/api/proto/wallet/v1"
	"hyapp/pkg/xerr"
	"hyapp/services/wallet-service/internal/domain/ledger"
	walletservice "hyapp/services/wallet-service/internal/service/wallet"
)

// Server 把 wallet-service 用例层适配为 gRPC 接口。
type Server struct {
	walletv1.UnimplementedWalletServiceServer

	svc *walletservice.Service
}

// NewServer 创建 wallet gRPC server。
func NewServer(svc *walletservice.Service) *Server {
	return &Server{svc: svc}
}

// DebitGift 只负责 protobuf 转换和错误映射，扣费规则在 service/repository。
func (s *Server) DebitGift(ctx context.Context, req *walletv1.DebitGiftRequest) (*walletv1.DebitGiftResponse, error) {
	receipt, err := s.svc.DebitGift(ctx, ledger.DebitGiftCommand{
		CommandID:     req.GetCommandId(),
		RoomID:        req.GetRoomId(),
		SenderUserID:  req.GetSenderUserId(),
		TargetUserID:  req.GetTargetUserId(),
		GiftID:        req.GetGiftId(),
		GiftCount:     req.GetGiftCount(),
		GiftUnitValue: req.GetGiftUnitValue(),
	})
	if err != nil {
		return nil, xerr.ToGRPCError(err)
	}

	return &walletv1.DebitGiftResponse{
		BillingReceiptId: receipt.BillingReceiptID,
		TotalGiftValue:   receipt.TotalGiftValue,
		BalanceAfter:     receipt.BalanceAfter,
	}, nil
}