first commit

src/games/onecard/deck.ts

@@ -0,0 +1,56 @@
+import type { Card, CardColor, CardValue } from './types'
+
+const COLORS: CardColor[] = ['red', 'yellow', 'green', 'blue']
+const NUMBER_VALUES: CardValue[] = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']
+const ACTION_VALUES: CardValue[] = ['skip', 'reverse', 'draw2']
+
+let cardIdCounter = 0
+
+function makeCard(color: CardColor, value: CardValue): Card {
+  return { id: `card-${cardIdCounter++}`, color, value }
+}
+
+export function createDeck(): Card[] {
+  cardIdCounter = 0
+  const deck: Card[] = []
+
+  for (const color of COLORS) {
+    deck.push(makeCard(color, '0'))
+    for (const value of NUMBER_VALUES.slice(1)) {
+      deck.push(makeCard(color, value), makeCard(color, value))
+    }
+    for (const value of ACTION_VALUES) {
+      deck.push(makeCard(color, value), makeCard(color, value))
+    }
+  }
+
+  for (let i = 0; i < 4; i++) {
+    deck.push(makeCard('wild', 'wild'), makeCard('wild', 'wild4'))
+  }
+
+  return shuffle(deck)
+}
+
+export function shuffle<T>(array: T[]): T[] {
+  const result = [...array]
+  for (let i = result.length - 1; i > 0; i--) {
+    const j = Math.floor(Math.random() * (i + 1))
+    const tmp = result[i]!
+    result[i] = result[j]!
+    result[j] = tmp
+  }
+  return result
+}
+
+export function drawRandom(deck: Card[]): { card: Card; deck: Card[] } | null {
+  if (deck.length === 0) return null
+  const index = Math.floor(Math.random() * deck.length)
+  const card = deck[index]!
+  const newDeck = [...deck.slice(0, index), ...deck.slice(index + 1)]
+  return { card, deck: newDeck }
+}
+
+export function returnToDeckRandom(deck: Card[], card: Card): Card[] {
+  const index = Math.floor(Math.random() * (deck.length + 1))
+  return [...deck.slice(0, index), card, ...deck.slice(index)]
+}