package wand

import (
	"fmt"
	"io"
	"strings"
)

type (
	synopsis       struct{}
	docOptions     struct{}
	docArguments   struct{}
	docSubcommands struct{}
)

type doc struct {
	name        string
	synopsis    synopsis
	description string
	options     docOptions
	arguments   docArguments
	subcommands docSubcommands
}

func help() Cmd {
	return Cmd{
		name:   "help",
		isHelp: true,
	}
}

func insertHelp(cmd Cmd) Cmd {
	var hasHelpCmd bool
	for i, sc := range cmd.subcommands {
		cmd.subcommands[i] = insertHelp(sc)
		if cmd.name == "help" {
			hasHelpCmd = true
		}
	}

	if !hasHelpCmd {
		cmd.subcommands = append(cmd.subcommands, help())
	}

	return cmd
}

func hasHelpSubcommand(cmd Cmd) bool {
	for _, sc := range cmd.subcommands {
		if sc.isHelp {
			return true
		}
	}

	return false
}

func hasCustomHelpOption(cmd Cmd) bool {
	mf := mapFields(cmd.impl)
	_, has := mf["help"]
	return has
}

func suggestHelp(out io.Writer, cmd Cmd, fullCommand []string) {
	if hasHelpSubcommand(cmd) {
		fmt.Fprintf(out, "Show help:\n%s help\n", strings.Join(fullCommand, " "))
		return
	}

	if !hasCustomHelpOption(cmd) {
		fmt.Fprintf(out, "Show help:\n%s --help\n", strings.Join(fullCommand, " "))
		return
	}
}

func constructDoc(cmd Cmd, fullCommand []string) doc {
	return doc{}
}

func showHelp(out io.Writer, cmd Cmd, fullCommand []string) {
}