feat: 添加21点游戏

handler/blackjack/model/card.go

@@ -0,0 +1,22 @@
+package model
+
+type Card struct {
+	Color string
+	Value []int
+	Name string
+	Visible bool
+}
+
+func NewCard(color string, name string, value []int, visible bool) *Card {
+	return &Card{
+		Color: color, 
+		Value: value,
+		Name: name,
+		Visible: visible,
+	}
+}
+
+func (card *Card) Flip() *Card {
+	card.Visible = !card.Visible
+	return card
+}

handler/blackjack/model/deck.go

@@ -0,0 +1,63 @@
+package model
+
+import "math/rand"
+
+type Deck struct {
+	cards []*Card
+}
+
+func NewDeck() *Deck {
+	deck := &Deck{
+		cards: []*Card{},
+	}
+	return deck
+}
+
+func (deck *Deck) Cards() []*Card {
+	return deck.cards
+}
+
+func (deck *Deck) Clear() *Deck {
+	deck.cards = []*Card{}
+	return deck;
+}
+
+func (deck *Deck) Length() int {
+	return len(deck.cards)
+}
+
+func (deck *Deck) Add(card *Card) *Deck {
+	deck.cards = append(deck.cards, card)
+	return deck
+}
+
+func (deck *Deck) Shuffle() *Deck {
+	for i := range deck.cards {
+		j := i + rand.Intn(len(deck.cards) - i)
+		deck.cards[i], deck.cards[j] = deck.cards[j], deck.cards[i]
+	}
+	return deck
+}
+
+func (deck *Deck) Draw() *Card {
+	if len(deck.cards) == 0 {
+		return nil
+	}
+	card := deck.cards[0]
+	deck.cards = deck.cards[1:]
+	return card
+}
+
+func (deck *Deck) Contains(color string, num int) bool {
+	for _, card := range deck.cards {
+		if card.Color == color {
+			for _, value := range card.Value {
+				if value == num {
+					return true
+				}
+			}
+		}
+	}
+
+	return false
+}