package replicator

import (
	"context"

	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/engine"
	putsvc "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/put"
	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/netmap"
	"go.uber.org/zap"
)

// TaskResult is a replication result interface.
type TaskResult interface {
	// SubmitSuccessfulReplication submits the successful object replication
	// to the given node.
	SubmitSuccessfulReplication(netmap.NodeInfo)
}

// HandleTask executes replication task inside invoking goroutine.
// Passes all the nodes that accepted the replication to the TaskResult.
func (p *Replicator) HandleTask(ctx context.Context, task Task, res TaskResult) {
	p.metrics.IncInFlightRequest()
	defer p.metrics.DecInFlightRequest()
	defer func() {
		p.log.Debug(logs.ReplicatorFinishWork,
			zap.Uint32("amount of unfinished replicas", task.quantity),
		)
	}()

	if task.obj == nil {
		var err error
		task.obj, err = engine.Get(ctx, p.localStorage, task.addr)
		if err != nil {
			p.log.Error(logs.ReplicatorCouldNotGetObjectFromLocalStorage,
				zap.Stringer("object", task.addr),
				zap.Error(err))

			return
		}
	}

	prm := new(putsvc.RemotePutPrm).
		WithObject(task.obj)

	for i := 0; task.quantity > 0 && i < len(task.nodes); i++ {
		select {
		case <-ctx.Done():
			return
		default:
		}

		log := p.log.With(
			zap.String("node", netmap.StringifyPublicKey(task.nodes[i])),
			zap.Stringer("object", task.addr),
		)

		callCtx, cancel := context.WithTimeout(ctx, p.putTimeout)

		err := p.remoteSender.PutObject(callCtx, prm.WithNodeInfo(task.nodes[i]))

		cancel()

		if err != nil {
			log.Error(logs.ReplicatorCouldNotReplicateObject,
				zap.String("error", err.Error()),
			)
		} else {
			log.Debug(logs.ReplicatorObjectSuccessfullyReplicated)

			task.quantity--

			res.SubmitSuccessfulReplication(task.nodes[i])

			p.metrics.IncProcessedObjects()
			p.metrics.AddPayloadSize(int64(task.obj.PayloadSize()))
		}
	}
}