package taskAgent

import (
	"context"
	log "github.com/sirupsen/logrus"
	"google.golang.org/protobuf/types/known/emptypb"
	"io"
	"task-processor/internal/structs"
	tt "task-processor/pkg/taskTransport/v1"
	"time"
)

type service struct {
	client  tt.TaskProcessorClient
	timeout time.Duration
}

func newService(c tt.TaskProcessorClient, timeout time.Duration) *service {
	return &service{
		client:  c,
		timeout: timeout,
	}
}

func (s *service) FetchTasks(ctx context.Context) (received []structs.Task, err error) {
	fetchCtx, cancel := context.WithTimeout(ctx, s.timeout)
	defer cancel()

	stream, err := s.client.RequestTasks(fetchCtx, &emptypb.Empty{})
	if err != nil {
		log.WithError(err).Errorf("%v failed to open stream", pkgLogHeader)
		return nil, err
	}

	log.Infof("%v Receiving tasks", pkgLogHeader)
	for {
		task, err := stream.Recv()
		if err == io.EOF {
			break
		}
		if err != nil {
			log.WithError(err).Errorf("%v failed to receive task", pkgLogHeader)
			return nil, err
		}

		received = append(received, structs.Task{
			MerchUuid: task.MerchUuid,
			Origins:   task.Origins,
		})
	}
	log.WithField("Count", len(received)).Infof("%v End receiving tasks", pkgLogHeader)

	return received, nil
}

func (s *service) SendResults(ctx context.Context, results []structs.Result) error {
	sendCtx, cancel := context.WithTimeout(ctx, s.timeout)
	defer cancel()

	stream, err := s.client.SendResults(sendCtx)
	if err != nil {
		log.WithError(err).Errorf("%v Failed to send results", pkgLogHeader)
		return err
	}

	for _, result := range results {
		toSend := tt.Result{
			MerchUuid:  result.MerchUuid,
			OriginName: result.OriginName,
			Price:      result.Price,
		}

		if err = stream.Send(&toSend); err != nil {
			log.WithError(err).Errorf("%v Failed to send results", pkgLogHeader)
			return err
		}
	}

	if err = stream.CloseSend(); err != nil {
		log.WithError(err).Errorf("%v Failed to close send stream", pkgLogHeader)
		return err
	}

	if _, err = stream.CloseAndRecv(); err != nil {
		log.WithError(err).Errorf("%v Failed to receive server response", pkgLogHeader)
		return err
	}

	log.Debugf("%v End send results", pkgLogHeader)
	return nil
}