package replicator

import (
	"context"
	"errors"

	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/engine"
	getsvc "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/get"
	tracingPkg "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/tracing"
	"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/trace"
	"go.uber.org/zap"
)

var errFailedToGetObjectFromAnyNode = errors.New("failed to get object from any node")

func (p *Replicator) HandlePullTask(ctx context.Context, task Task) {
	p.metrics.IncInFlightRequest()
	defer p.metrics.DecInFlightRequest()
	defer func() {
		p.log.Debug(logs.ReplicatorFinishWork, zap.String("type", "pull"))
	}()

	ctx, span := tracing.StartSpanFromContext(ctx, "Replicator.HandlePullTask",
		trace.WithAttributes(
			attribute.Stringer("address", task.Addr),
			attribute.Int("nodes_count", len(task.Nodes)),
		))
	defer span.End()

	var obj *objectSDK.Object

	for _, node := range task.Nodes {
		var err error
		obj, err = p.remoteGetter.Get(ctx, getsvc.RemoteGetPrm{
			Address: task.Addr,
			Node:    node,
		})
		if err == nil {
			break
		}
		var endpoints []string
		node.IterateNetworkEndpoints(func(s string) bool {
			endpoints = append(endpoints, s)
			return false
		})
		p.log.Error(logs.ReplicatorCouldNotGetObjectFromRemoteStorage,
			zap.Stringer("object", task.Addr),
			zap.Error(err),
			zap.Strings("endpoints", endpoints),
			zap.String("trace_id", tracingPkg.GetTraceID(ctx)))
	}

	if obj == nil {
		p.log.Error(logs.ReplicatorCouldNotGetObjectFromRemoteStorage,
			zap.Stringer("object", task.Addr),
			zap.Error(errFailedToGetObjectFromAnyNode),
			zap.String("trace_id", tracingPkg.GetTraceID(ctx)))
		return
	}

	err := engine.Put(ctx, p.localStorage, obj)
	if err != nil {
		p.log.Error(logs.ReplicatorCouldNotPutObjectToLocalStorage,
			zap.Stringer("object", task.Addr),
			zap.Error(err),
			zap.String("trace_id", tracingPkg.GetTraceID(ctx)))
	}
}