package replicator

import (
	"context"

	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/engine"
	objectwriter "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/common/writer"
	tracingPkg "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/tracing"
	"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/netmap"
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/trace"
	"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)
}

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

	ctx, span := tracing.StartSpanFromContext(ctx, "Replicator.HandleReplicateTask",
		trace.WithAttributes(
			attribute.Stringer("address", task.Addr),
			attribute.Int64("number_of_copies", int64(task.NumCopies)),
		))
	defer span.End()

	if task.Obj == nil {
		var err error
		task.Obj, err = engine.Get(ctx, p.localStorage, task.Addr)
		if err != nil {
			p.log.Error(ctx, logs.ReplicatorCouldNotGetObjectFromLocalStorage,
				zap.Stringer("object", task.Addr),
				zap.Error(err),
				zap.String("trace_id", tracingPkg.GetTraceID(ctx)))

			return
		}
	}

	prm := new(objectwriter.RemotePutPrm).
		WithObject(task.Obj)

	for i := 0; task.NumCopies > 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),
			zap.String("trace_id", tracingPkg.GetTraceID(ctx)),
		)

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

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

		cancel()

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

			task.NumCopies--

			res.SubmitSuccessfulReplication(task.Nodes[i])

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