From 18d568b5c335e8178941a2df82bc77927caafc17 Mon Sep 17 00:00:00 2001
From: Ryan Cavicchioni <ryan@cavi.cc>
Date: Thu, 1 Sep 2022 09:24:55 -0500
Subject: [PATCH] Add DealHandler

---
 bot/handler/deal.go | 111 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 bot/handler/deal.go

diff --git a/bot/handler/deal.go b/bot/handler/deal.go
new file mode 100644
index 0000000..6ae95db
--- /dev/null
+++ b/bot/handler/deal.go
@@ -0,0 +1,111 @@
+package handler
+
+import (
+	"errors"
+	"fmt"
+	"math/rand"
+	"strconv"
+	"strings"
+
+	"git.kill0.net/chill9/beepboop/bot"
+	"git.kill0.net/chill9/beepboop/lib"
+	"github.com/bwmarrin/discordgo"
+	log "github.com/sirupsen/logrus"
+)
+
+type (
+	DealHandler struct {
+		config bot.Config
+		Name   string
+	}
+
+	Card string
+
+	Deck [52]Card
+)
+
+var deck Deck = Deck{
+	"2♣", "3♣", "4♣", "5♣", "6♣", "7♣", "8♣", "9♣", "10♣", "J♣", "Q♣", "K♣", "A♣",
+	"2♦", "3♦", "4♦", "5♦", "6♦", "7♦", "8♦", "9♦", "10♦", "J♦", "Q♦", "K♦", "A♦",
+	"2♥", "3♥", "4♥", "5♥", "6♥", "7♥", "8♥", "9♥", "10♥", "J♥", "Q♥", "K♥", "A♥",
+	"2♠", "3♠", "4♠", "5♠", "6♠", "7♠", "8♠", "9♠", "10♠", "J♠", "Q♠", "K♠", "A♠",
+}
+
+func (d *Deck) Deal(n int) ([]Card, error) {
+	var (
+		hand []Card
+		err  error
+	)
+
+	if n < 1 {
+		err = errors.New("number cannot be less than 1")
+		return hand, err
+	}
+
+	if n > len(d) {
+		err = errors.New("number is greater than cards in the deck")
+		return hand, err
+	}
+
+	hand = deck[0:n]
+
+	return hand, err
+}
+
+func NewDealHandler(s string) *DealHandler {
+	h := new(DealHandler)
+	h.Name = s
+	return h
+}
+
+func (h *DealHandler) SetConfig(config bot.Config) {
+	h.config = config
+}
+
+func (h *DealHandler) Handle(s *discordgo.Session, m *discordgo.MessageCreate) {
+	if m.Author.ID == s.State.User.ID {
+		return
+	}
+
+	if !lib.HasCommand(m.Content, h.config.Prefix, h.Name) {
+		return
+	}
+
+	rand.Shuffle(len(deck), func(i, j int) {
+		deck[i], deck[j] = deck[j], deck[i]
+	})
+
+	log.Debugf("%+v", deck)
+
+	_, args := lib.SplitCommandAndArgs(m.Content, h.config.Prefix)
+
+	if len(args) != 1 {
+		s.ChannelMessageSend(m.ChannelID, fmt.Sprintf("help: `!%s <n>`", h.Name))
+		return
+	}
+
+	n, err := strconv.Atoi(args[0])
+	if err != nil {
+		log.Errorf("failed to convert string to int: %s", err)
+	}
+
+	hand, err := deck.Deal(n)
+	if err != nil {
+		s.ChannelMessageSend(m.ChannelID, fmt.Sprintf("error: %s\n", err))
+		return
+	}
+
+	s.ChannelMessageSend(m.ChannelID, JoinCards(hand, " "))
+}
+
+func JoinCards(h []Card, sep string) string {
+	var b []string
+
+	b = make([]string, len(h))
+
+	for i, v := range h {
+		b[i] = string(v)
+	}
+
+	return strings.Join(b, sep)
+}