package main

import (
	"errors"
	"fmt"
	"strconv"
	"strings"

	"github.com/diamondburned/arikawa/bot"
	"github.com/diamondburned/arikawa/bot/extras/arguments"
	"github.com/diamondburned/arikawa/discord"
	"github.com/diamondburned/arikawa/gateway"
)

type Bot struct {
	// Context must not be embedded.
	Ctx *bot.Context
}

func (bot *Bot) Help(m *gateway.MessageCreateEvent) error {
	_, err := bot.Ctx.SendMessage(m.ChannelID, bot.Ctx.Help(), nil)
	return err
}

func (bot *Bot) Ping(m *gateway.MessageCreateEvent) error {
	_, err := bot.Ctx.SendMessage(m.ChannelID, "Pong!", nil)
	return err
}

func (bot *Bot) Say(m *gateway.MessageCreateEvent, f *arguments.Flag) error {
	args := f.String()
	if args == "" {
		// Empty message, ignore
		return nil
	}

	_, err := bot.Ctx.SendMessage(m.ChannelID, args, nil)
	return err
}

func (bot *Bot) Embed(
	m *gateway.MessageCreateEvent, f *arguments.Flag) error {

	fs := arguments.NewFlagSet()

	var (
		title  = fs.String("title", "", "Title")
		author = fs.String("author", "", "Author")
		footer = fs.String("footer", "", "Footer")
		color  = fs.String("color", "#FFFFFF", "Color in hex format #hhhhhh")
	)

	if err := f.With(fs.FlagSet); err != nil {
		return err
	}

	if len(fs.Args()) < 1 {
		return fmt.Errorf("Usage: embed [flags] content...\n" + fs.Usage())
	}

	// Check if the color string is valid.
	if !strings.HasPrefix(*color, "#") || len(*color) != 7 {
		return errors.New("Invalid color, format must be #hhhhhh")
	}

	// Parse the color into decimal numbers.
	colorHex, err := strconv.ParseInt((*color)[1:], 16, 64)
	if err != nil {
		return err
	}

	// Make a new embed
	embed := discord.Embed{
		Title:       *title,
		Description: strings.Join(fs.Args(), " "),
		Color:       discord.Color(colorHex),
	}

	if *author != "" {
		embed.Author = &discord.EmbedAuthor{
			Name: *author,
		}
	}
	if *footer != "" {
		embed.Footer = &discord.EmbedFooter{
			Text: *footer,
		}
	}

	_, err = bot.Ctx.SendMessage(m.ChannelID, "", &embed)
	return err
}