//go:build generate
// +build generate

package main

import (
	"flag"
	"fmt"
	"os"
	"time"

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

	"go.jolheiser.com/ffmd"
)

//go:generate go run main.go
func main() {
	fs := flagSet("myapp-")
	cmd := &ffcli.Command{
		Name:    "myapp",
		FlagSet: fs,
	}
	fs1 := flagSet("sub1-")
	cmd1 := &ffcli.Command{
		Name:       "sub1",
		ShortUsage: "root [FLAGS] sub1 [FLAGS] [ARGS...]",
		FlagSet:    fs1,
	}
	fs2 := flagSet("sub2-")
	cmd2 := &ffcli.Command{
		Name:       "sub2",
		ShortUsage: "root [FLAGS] sub2 [FLAGS] [ARGS...]",
		ShortHelp:  "Short help",
		FlagSet:    fs2,
	}
	fs3 := flagSet("sub3-")
	cmd3 := &ffcli.Command{
		Name:       "sub3",
		ShortUsage: "root [FLAGS] sub2 [FLAGS] sub3 [FLAGS] [ARGS...]",
		ShortHelp:  "Short help",
		LongHelp:   "Long help",
		FlagSet:    fs3,
	}
	fs4 := flagSet("sub4-")
	cmd4 := &ffcli.Command{
		Name:    "sub4",
		FlagSet: fs4,
	}
	fs5 := flagSet("sub5-")
	cmd5 := &ffcli.Command{
		Name:    "sub5",
		FlagSet: fs5,
	}
	fs6 := flagSet("sub6-")
	cmd6 := &ffcli.Command{
		Name:    "sub6",
		FlagSet: fs6,
	}

	cmd.Subcommands = []*ffcli.Command{cmd1, cmd2, cmd6}
	cmd2.Subcommands = []*ffcli.Command{cmd3, cmd5}
	cmd3.Subcommands = []*ffcli.Command{cmd4}

	md, err := ffmd.Command(cmd)
	if err != nil {
		panic(err)
	}
	write("README.md", md)
}

func write(path, content string) {
	fi, err := os.Create(path)
	if err != nil {
		panic(err)
	}
	defer fi.Close()
	if _, err := fi.WriteString(content); err != nil {
		panic(err)
	}
}

func flagSet(name string) *flag.FlagSet {
	fs := flag.NewFlagSet("myapp", flag.ExitOnError)
	fs.String(fmt.Sprintf("%sstring-flag", name), "", "String flag with no default")
	fs.String(fmt.Sprintf("%sstring-flag-default", name), "string default", "String flag with default")
	fs.Int(fmt.Sprintf("%sint-flag", name), 0, "Int flag with no default")
	fs.Int(fmt.Sprintf("%sint-flag-default", name), 100, "Int flag with default")
	fs.Bool(fmt.Sprintf("%sbool-flag-f", name), false, "Bool flag false")
	fs.Bool(fmt.Sprintf("%sbool-flag-t", name), true, "Bool flag true")
	fs.Duration(fmt.Sprintf("%sduration-flag", name), 0, "Duration flag with no default")
	fs.Duration(fmt.Sprintf("%sduration-flag-default", name), time.Minute*5, "Duration flag with default")
	return fs
}