package cli

import (
	"context"
	"flag"
	"fmt"
	"io"

	"gitea.maximumdirect.net/eric/distributor/internal/app"
)

func versionCommand(_ context.Context, args []string, stdout, stderr io.Writer) int {
	if hasHelp(args) {
		printVersionHelp(stdout)
		return exitOK
	}
	flags := flag.NewFlagSet("version", flag.ContinueOnError)
	flags.SetOutput(stderr)
	formatFlag := addFormatFlag(flags)
	if err := flags.Parse(args); err != nil {
		return exitUsage
	}
	if rejectExtraArgs(stderr, "version", flags.Args()) {
		return exitUsage
	}
	format, ok := parseOutputFormat(stderr, "version", *formatFlag)
	if !ok {
		return exitUsage
	}
	if app.IsJSONOutput(format) {
		err := app.WriteJSONEnvelope(stdout, "version", true, nil, versionResult{
			Application: app.Name,
			Version:     app.Version,
		}, nil)
		if err != nil {
			return fail(stderr, err)
		}
		return exitOK
	}
	fmt.Fprintln(stdout, app.VersionString())
	return exitOK
}

type versionResult struct {
	Application string `json:"application"`
	Version     string `json:"version"`
}

func printVersionHelp(w io.Writer) {
	fmt.Fprint(w, `Usage:
  distributor version [--format text|json]

Options:
  --format text|json  Output format

Print version information.
`)
}