package control

import (
	"context"
	"errors"

	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/engine"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/util/logicerr"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/control"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/control/server/ctrlmessage"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
)

func (s *Server) StartShardEvacuation(ctx context.Context, req *control.StartShardEvacuationRequest) (*control.StartShardEvacuationResponse, error) {
	err := s.isValidRequest(req)
	if err != nil {
		return nil, status.Error(codes.PermissionDenied, err.Error())
	}

	if req.GetBody().GetScope() == uint32(control.StartShardEvacuationRequest_Body_NONE) {
		return nil, status.Error(codes.InvalidArgument, "no evacuation scope")
	}

	prm := engine.EvacuateShardPrm{
		ShardID:        s.getShardIDList(req.GetBody().GetShard_ID()),
		IgnoreErrors:   req.GetBody().GetIgnoreErrors(),
		ObjectsHandler: s.replicateObject,
		TreeHandler:    s.replicateTree,
		Async:          true,
		Scope:          engine.EvacuateScope(req.GetBody().GetScope()),
	}

	_, err = s.s.Evacuate(ctx, prm)
	if err != nil {
		var logicalErr logicerr.Logical
		if errors.As(err, &logicalErr) {
			return nil, status.Error(codes.Aborted, err.Error())
		}
		return nil, status.Error(codes.Internal, err.Error())
	}

	resp := &control.StartShardEvacuationResponse{
		Body: &control.StartShardEvacuationResponse_Body{},
	}

	err = ctrlmessage.Sign(s.key, resp)
	if err != nil {
		return nil, status.Error(codes.Internal, err.Error())
	}
	return resp, nil
}

func (s *Server) GetShardEvacuationStatus(ctx context.Context, req *control.GetShardEvacuationStatusRequest) (*control.GetShardEvacuationStatusResponse, error) {
	err := s.isValidRequest(req)
	if err != nil {
		return nil, status.Error(codes.PermissionDenied, err.Error())
	}

	state, err := s.s.GetEvacuationState(ctx)
	if err != nil {
		var logicalErr logicerr.Logical
		if errors.As(err, &logicalErr) {
			return nil, status.Error(codes.Aborted, err.Error())
		}
		return nil, status.Error(codes.Internal, err.Error())
	}

	resp, err := stateToResponse(state)
	if err != nil {
		return nil, err
	}

	err = ctrlmessage.Sign(s.key, resp)
	if err != nil {
		return nil, status.Error(codes.Internal, err.Error())
	}
	return resp, nil
}

func (s *Server) StopShardEvacuation(ctx context.Context, req *control.StopShardEvacuationRequest) (*control.StopShardEvacuationResponse, error) {
	err := s.isValidRequest(req)
	if err != nil {
		return nil, status.Error(codes.PermissionDenied, err.Error())
	}

	err = s.s.EnqueRunningEvacuationStop(ctx)
	if err != nil {
		var logicalErr logicerr.Logical
		if errors.As(err, &logicalErr) {
			return nil, status.Error(codes.Aborted, err.Error())
		}
		return nil, status.Error(codes.Internal, err.Error())
	}

	resp := &control.StopShardEvacuationResponse{
		Body: &control.StopShardEvacuationResponse_Body{},
	}

	err = ctrlmessage.Sign(s.key, resp)
	if err != nil {
		return nil, status.Error(codes.Internal, err.Error())
	}

	s.s.ResetEvacuationStatusForShards()

	return resp, nil
}

func (s *Server) ResetShardEvacuationStatus(ctx context.Context, req *control.ResetShardEvacuationStatusRequest) (*control.ResetShardEvacuationStatusResponse, error) {
	err := s.isValidRequest(req)
	if err != nil {
		return nil, status.Error(codes.PermissionDenied, err.Error())
	}

	err = s.s.ResetEvacuationStatus(ctx)
	if err != nil {
		var logicalErr logicerr.Logical
		if errors.As(err, &logicalErr) {
			return nil, status.Error(codes.Aborted, err.Error())
		}
		return nil, status.Error(codes.Internal, err.Error())
	}

	resp := &control.ResetShardEvacuationStatusResponse{
		Body: &control.ResetShardEvacuationStatusResponse_Body{},
	}

	err = ctrlmessage.Sign(s.key, resp)
	if err != nil {
		return nil, status.Error(codes.Internal, err.Error())
	}
	return resp, nil
}