package common

import (
	"context"
	"fmt"
	"sort"
	"strings"

	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-cli/internal/commonflags"
	commonCmd "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/internal/common"
	"git.frostfs.info/TrueCloudLab/frostfs-node/misc"
	"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
	"github.com/spf13/cobra"
	"go.opentelemetry.io/otel/trace"
)

type spanKey struct{}

// StopClientCommandSpan stops tracing span for the command and prints trace ID on the standard output.
func StopClientCommandSpan(cmd *cobra.Command, _ []string) {
	span, ok := cmd.Context().Value(spanKey{}).(trace.Span)
	if !ok {
		return
	}

	span.End()

	// Noop provider cannot fail on flush.
	_ = tracing.Shutdown(cmd.Context())

	cmd.PrintErrf("Trace ID: %s\n", span.SpanContext().TraceID())
}

// StartClientCommandSpan starts tracing span for the command.
func StartClientCommandSpan(cmd *cobra.Command) {
	enableTracing, err := cmd.Flags().GetBool(commonflags.TracingFlag)
	if err != nil || !enableTracing {
		return
	}

	_, err = tracing.Setup(cmd.Context(), tracing.Config{
		Enabled:  true,
		Exporter: tracing.NoOpExporter,
		Service:  "frostfs-cli",
		Version:  misc.Version,
	})
	commonCmd.ExitOnErr(cmd, "init tracing: %w", err)

	var components sort.StringSlice
	for c := cmd; c != nil; c = c.Parent() {
		fmt.Println(c.Name())
		components = append(components, c.Name())
	}
	for i, j := 0, len(components)-1; i < j; {
		components.Swap(i, j)
		i++
		j--
	}

	operation := strings.Join(components, ".")
	ctx, span := tracing.StartSpanFromContext(cmd.Context(), operation)
	ctx = context.WithValue(ctx, spanKey{}, span)
	cmd.SetContext(ctx)
}