package doc

import (
	"encoding/json"
	"fmt"
	"os"
	"strings"

	"github.com/ethereum-optimism/optimism/op-node/metrics"
	"github.com/olekukonko/tablewriter"
	"github.com/urfave/cli/v2"
)

var Subcommands = cli.Commands{
	{
		Name:  "metrics",
		Usage: "Dumps a list of supported metrics to stdout",
		Flags: []cli.Flag{
			&cli.StringFlag{
				Name:  "format",
				Value: "markdown",
				Usage: "Output format (json|markdown)",
			},
		},
		Action: func(ctx *cli.Context) error {
			m := metrics.NewMetrics("default")
			supportedMetrics := m.Document()
			format := ctx.String("format")

			if format != "markdown" && format != "json" {
				return fmt.Errorf("invalid format: %s", format)
			}

			if format == "json" {
				enc := json.NewEncoder(os.Stdout)
				return enc.Encode(supportedMetrics)
			}

			table := tablewriter.NewWriter(os.Stdout)
			table.SetBorders(tablewriter.Border{Left: true, Top: false, Right: true, Bottom: false})
			table.SetCenterSeparator("|")
			table.SetAutoWrapText(false)
			table.SetHeader([]string{"Metric", "Description", "Labels", "Type"})
			var data [][]string
			for _, metric := range supportedMetrics {
				labels := strings.Join(metric.Labels, ",")
				data = append(data, []string{metric.Name, metric.Help, labels, metric.Type})
			}
			table.AppendBulk(data)
			table.Render()
			return nil
		},
	},
}
