impl some hands

src/entity/hand.go

@@ -1,5 +1,9 @@
 package entity
 
+import (
+	"sort"
+)
+
 type Hand struct {
 	Public  []Card
 	Private []Card
@@ -15,3 +19,38 @@ func (hand *Hand) Push(card Card) {
 func (hand Hand) Len() int {
 	return len(hand.Public) + len(hand.Private)
 }
+
+func (hand Hand) AllCards() []Card {
+	allcards := make([]Card, 0, len(hand.Public)+len(hand.Private))
+	for _, cards := range [][]Card{hand.Public, hand.Private} {
+		allcards = append(allcards, cards...)
+	}
+	return allcards
+}
+
+func (hand Hand) Flush() bool {
+	suit := -1
+	for _, card := range hand.AllCards() {
+		if suit == -1 {
+			suit = card.Suit
+		} else if suit != card.Suit {
+			return false
+		}
+	}
+	return suit != -1
+}
+
+func (hand Hand) Straight() bool {
+	cards := hand.AllCards()
+	values := make([]int, 0, len(cards))
+	for _, card := range cards {
+		values = append(values, card.Value)
+	}
+	sort.Ints(values)
+	for i := 1; i < len(values); i++ {
+		if values[i-1]+1 != values[i] {
+			return false
+		}
+	}
+	return len(values) > 1
+}