package cli

import (
	"context"
	"flag"
	"fmt"
	"strings"

	"github.com/peterbourgon/ff/v3/ffcli"

	metrics "edge-infra.dev/pkg/lib/gcp/monitoring/metrics"
	"edge-infra.dev/pkg/lib/gcp/monitoring/monutil"
)

var getCmd = &ffcli.Command{
	Name:       "get",
	ShortUsage: "get [flags]",
	ShortHelp:  "Get a specific metric descriptor by name",
	LongHelp: strings.TrimSpace(`
Fetches the specific metric descriptor by name.
`),
	FlagSet: globalFlags,
	Exec:    runGet,
}

func runGet(ctx context.Context, args []string) error {
	var err error

	if len(args) > 0 {
		Fatalf("too many non-flag arguments: %q", args)
	}
	if !checkGetFlags() || !checkGlobalFlags() {
		return flag.ErrHelp
	}

	client, err := metrics.New(ctx, projectID)
	if err != nil {
		return Errorf("failed to create metric client: %w", err)
	}

	d, err := client.GetDescriptor(metricPrefix, metricName)
	if err != nil {
		return err
	}

	if jsonFormat {
		_ = metrics.TmplJSON.Execute(Stdout, d)
	} else {
		_ = metrics.TmplDesc.Execute(Stdout, d)
		fmt.Printf("\n%s", monutil.White(mmBroomTitle))
	}

	return nil
}

// checkGetFlags validates the required get subcommand flags have been provided.
func checkGetFlags() bool {
	if monutil.IsList(projectID) {
		fmt.Println("Error: 'get' currently supports single project/metric queries only - please specify only one project ID for the 'get' action")
		return false
	}

	return true
}