deck.go

package main

import (
	"fmt"
	"io/ioutil"
	"math/rand"
	"os"
	"strings"
	"time"
)

// Create a new type of 'deck'
// which is a slice of strings
type deck []string

var cardSuits = []string{"♠", "♥", "♣", "♦"}
var cardValues = []string{
	"A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K",
}

func newDeck() deck {
	cards := deck{}

	for _, suit := range cardSuits {
		for _, value := range cardValues {
			cards = append(cards, value+suit)
		}
	}

	return cards
}

func (d deck) print() {
	for _, card := range d {
		fmt.Println(card)
	}
}

func deal(d deck, handSize int) (deck, deck) {
	hand := d[:handSize]
	remainingDeck := d[handSize:]
	return hand, remainingDeck
}

func (d deck) toString() string {
	return strings.Join([]string(d), ",")
}

func (d deck) saveToFile(filename string) error {
	return ioutil.WriteFile("files/"+filename, []byte(d.toString()), 0666)
}

func newDeckFromFile(filename string) deck {
	bs, err := ioutil.ReadFile("files/" + filename)
	if err != nil {
		fmt.Println("Error:", err)
		os.Exit(1)
	}
	return deck(strings.Split(string(bs), ","))
}

func (d deck) shuffle() {
	rand.Seed(time.Now().UnixNano())
	rand.Shuffle(len(d), func(i, j int) { d[i], d[j] = d[j], d[i] })
}