package discord

import (
	"fmt"
	"strings"
)

func init() {
	commands["help"] = command{
		validate: func(cmd commandInit) bool {
			return true
		},
		run: func(cmd commandInit) error {
			args := strings.Fields(cmd.message.Content)[1:]

			var resp string
			if len(args) == 1 {
				resp = singleHelp(args[0])
			} else {
				resp = allHelp()
			}
			sendMessage(cmd.session, cmd.message.ChannelID, resp)
			return nil
		},
		help: "HELP! HEEEEEEEEEELP!",
	}
}

func singleHelp(cmd string) string {
	if c, ok := commands[cmd]; ok {
		return fmt.Sprintf("%s: %s", cmd, c.help)
	}
	return "Unknown command"
}

func allHelp() string {
	helps := make([]string, 0)
	for n, c := range commands {
		helps = append(helps, fmt.Sprintf("%s: %s", n, c.help))
	}
	return strings.Join(helps, "\n")
}