package grpc

import (
	"context"

	pb "spektr/internal/grpc/pb"

	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials/insecure"
)

type Client struct {
	conn   *grpc.ClientConn
	cancel context.CancelFunc
	stream pb.ReceiverService_ConnectClient
}

func Dial(ctx context.Context, addr string) (*Client, error) {
	conn, err := grpc.DialContext(ctx, addr, grpc.WithBlock(), grpc.WithTransportCredentials(insecure.NewCredentials()))
	if err != nil {
		return nil, err
	}

	client := pb.NewReceiverServiceClient(conn)
	streamCtx, cancel := context.WithCancel(context.Background())
	stream, err := client.Connect(streamCtx)
	if err != nil {
		cancel()
		_ = conn.Close()
		return nil, err
	}

	return &Client{conn: conn, cancel: cancel, stream: stream}, nil
}

func (c *Client) Send(msg *pb.ClientMessage) (*pb.ServerMessage, error) {
	if err := c.stream.Send(msg); err != nil {
		return nil, err
	}
	return c.stream.Recv()
}

func (c *Client) Close() error {
	if c.cancel != nil {
		c.cancel()
	}
	return c.conn.Close()
}