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// Only one '0' per color\n for (let i = 0; i < count; i++) {\n deck.push({\n id: `${color}-${value}-${i}`,\n color: color,\n value: value\n });\n }\n });\n\n // Add special cards (skip, reverse, draw2)\n SPECIAL_VALUES.forEach(value => {\n for (let i = 0; i < 2; i++) {\n deck.push({\n id: `${color}-${value}-${i}`,\n color: color,\n value: value\n });\n }\n });\n });\n\n // Add wild cards\n WILD_VALUES.forEach(value => {\n for (let i = 0; i < 4; i++) {\n deck.push({\n id: `wild-${value}-${i}`,\n color: \"wild\",\n value: value\n });\n }\n });\n\n return shuffleDeck(deck);\n}\n\n// Shuffle the deck using Fisher-Yates algorithm\nexport function shuffleDeck(deck: Card[]): Card[] {\n const shuffled = [...deck];\n for (let i = shuffled.length - 1; i > 0; i--) {\n const j = Math.floor(Math.random() * (i + 1));\n [shuffled[i], shuffled[j]] = [shuffled[j], shuffled[i]];\n }\n return shuffled;\n}\n\n// Deal initial cards to players\nexport function dealCards(players: Player[], deck: Card[]): { players: Player[], deck: Card[] } {\n const updatedPlayers = [...players];\n const updatedDeck = [...deck];\n\n updatedPlayers.forEach(player => {\n player.hand = [];\n for (let i = 0; i < INITIAL_CARDS; i++) {\n if (updatedDeck.length > 0) {\n const card = updatedDeck.pop()!;\n player.hand.push(card);\n }\n }\n });\n\n return { players: updatedPlayers, deck: updatedDeck };\n}\n\n// Initialize a new game\nexport function initializeGame(gameId: string, playerIds: string[]): GameState {\n const deck = createDeck();\n \n // Create players\n const players: Player[] = playerIds.map((id, index) => ({\n id,\n name: `Player ${index + 1}`,\n hand: [],\n isActive: index === 0, // First player is active\n calledUno: false\n }));\n\n // Deal cards\n const { players: updatedPlayers, deck: updatedDeck } = dealCards(players, deck);\n \n // Get the first card for the discard pile (cannot be a wild card)\n let firstCard: Card | undefined;\n let discardPile: Card[] = [];\n \n // Find a non-wild card for the first discard\n for (let i = updatedDeck.length - 1; i >= 0; i--) {\n if (updatedDeck[i].color !== \"wild\") {\n firstCard = updatedDeck.splice(i, 1)[0];\n break;\n }\n }\n \n if (firstCard) {\n discardPile = [firstCard];\n }\n\n return {\n gameId,\n players: updatedPlayers,\n deck: updatedDeck,\n discardPile,\n currentPlayer: 0,\n direction: 1,\n currentColor: discardPile[0]?.color || \"red\",\n gameStarted: true,\n gameOver: false,\n winner: null,\n lastAction: \"Game started\"\n };\n}\n\n// Check if a card can be played on the current discard pile\nexport function canPlayCard(card: Card, topCard: Card, currentColor: CardColor): boolean {\n // Wild cards can always be played\n if (card.color === \"wild\") {\n return true;\n }\n \n // Match by color\n if (card.color === currentColor) {\n return true;\n }\n \n // Match by value\n if (card.value === topCard.value) {\n return true;\n }\n \n return false;\n}\n\n// Play a card and update the game state\nexport function playCard(\n gameState: GameState, \n playerId: string, \n cardId: string, \n chosenColor?: CardColor\n): { gameState: GameState, success: boolean, error?: string } {\n const { players, discardPile, currentPlayer, direction } = gameState;\n \n // Check if it's the player's turn\n if (players[currentPlayer].id !== playerId) {\n return {\n gameState,\n success: false,\n error: \"It's not your turn\"\n };\n }\n \n // Find the card in the player's hand\n const playerIndex = players.findIndex(p => p.id === playerId);\n const cardIndex = players[playerIndex].hand.findIndex(c => c.id === cardId);\n \n if (cardIndex === -1) {\n return {\n gameState,\n success: false,\n error: \"Card not found in player's hand\"\n };\n }\n \n const card = players[playerIndex].hand[cardIndex];\n const topCard = discardPile[discardPile.length - 1];\n \n // Check if the card can be played\n if (!canPlayCard(card, topCard, gameState.currentColor)) {\n return {\n gameState,\n success: false,\n error: \"Card cannot be played\"\n };\n }\n \n // Remove the card from the player's hand\n const updatedPlayers = [...players];\n const playedCard = updatedPlayers[playerIndex].hand.splice(cardIndex, 1)[0];\n \n // Add the card to the discard pile\n const updatedDiscardPile = [...discardPile, playedCard];\n \n // Update the current color\n let updatedColor = gameState.currentColor;\n if (playedCard.color === \"wild\") {\n if (!chosenColor || !CARD_COLORS.includes(chosenColor as any)) {\n return {\n gameState,\n success: false,\n error: \"Must choose a valid color for wild card\"\n };\n }\n updatedColor = chosenColor;\n } else {\n updatedColor = playedCard.color;\n }\n \n // Check if the player has won\n let gameOver = false;\n let winner = null;\n if (updatedPlayers[playerIndex].hand.length === 0) {\n gameOver = true;\n winner = playerId;\n }\n \n // Handle special cards\n let nextPlayer = (currentPlayer + direction) % players.length;\n if (nextPlayer < 0) nextPlayer += players.length; // Handle negative index\n \n let lastAction = `Player ${playerIndex + 1} played ${playedCard.color} ${playedCard.value}`;\n \n // Apply special card effects\n switch (playedCard.value) {\n case \"skip\":\n nextPlayer = (nextPlayer + direction) % players.length;\n if (nextPlayer < 0) nextPlayer += players.length;\n lastAction += \" - Skipped next player\";\n break;\n \n case \"reverse\":\n const updatedDirection = direction === 1 ? -1 : 1;\n gameState.direction = updatedDirection;\n \n // With 2 players, reverse acts like skip\n if (players.length === 2) {\n nextPlayer = currentPlayer;\n } else {\n nextPlayer = (currentPlayer + updatedDirection) % players.length;\n if (nextPlayer < 0) nextPlayer += players.length;\n }\n lastAction += \" - Reversed direction\";\n break;\n \n case \"draw2\":\n // Next player draws 2 cards\n for (let i = 0; i < 2; i++) {\n if (gameState.deck.length > 0) {\n const drawnCard = gameState.deck.pop()!;\n updatedPlayers[nextPlayer].hand.push(drawnCard);\n }\n }\n \n // Skip the next player's turn\n nextPlayer = (nextPlayer + direction) % players.length;\n if (nextPlayer < 0) nextPlayer += players.length;\n lastAction += \" - Next player draws 2 and is skipped\";\n break;\n \n case \"wilddraw4\":\n // Next player draws 4 cards\n for (let i = 0; i < 4; i++) {\n if (gameState.deck.length > 0) {\n const drawnCard = gameState.deck.pop()!;\n updatedPlayers[nextPlayer].hand.push(drawnCard);\n }\n }\n \n // Skip the next player's turn\n nextPlayer = (nextPlayer + direction) % players.length;\n if (nextPlayer < 0) nextPlayer += players.length;\n lastAction += ` - Changed color to ${updatedColor}, next player draws 4 and is skipped`;\n break;\n \n case \"wild\":\n lastAction += ` - Changed color to ${updatedColor}`;\n break;\n }\n \n // Reset UNO call status if player has more than 1 card\n if (updatedPlayers[playerIndex].hand.length > 1) {\n updatedPlayers[playerIndex].calledUno = false;\n }\n \n // Update the game state\n const updatedGameState: GameState = {\n ...gameState,\n players: updatedPlayers,\n discardPile: updatedDiscardPile,\n currentPlayer: nextPlayer,\n currentColor: updatedColor,\n gameOver,\n winner,\n lastAction\n };\n \n return {\n gameState: updatedGameState,\n success: true\n };\n}\n\n// Draw a card from the deck\nexport function drawCard(gameState: GameState, playerId: string): { gameState: GameState, success: boolean, error?: string } {\n const { players, deck, currentPlayer } = gameState;\n \n // Check if it's the player's turn\n if (players[currentPlayer].id !== playerId) {\n return {\n gameState,\n success: false,\n error: \"It's not your turn\"\n };\n }\n \n // Check if there are cards in the deck\n if (deck.length === 0) {\n // Reshuffle the discard pile except the top card\n if (gameState.discardPile.length > 1) {\n const topCard = gameState.discardPile[gameState.discardPile.length - 1];\n const newDeck = shuffleDeck(gameState.discardPile.slice(0, -1));\n gameState.deck = newDeck;\n gameState.discardPile = [topCard];\n } else {\n return {\n gameState,\n success: false,\n error: \"No cards left to draw\"\n };\n }\n }\n \n // Draw a card\n const updatedPlayers = [...players];\n const playerIndex = updatedPlayers.findIndex(p => p.id === playerId);\n const drawnCard = gameState.deck.pop()!;\n updatedPlayers[playerIndex].hand.push(drawnCard);\n \n // Move to the next player\n let nextPlayer = (currentPlayer + gameState.direction) % players.length;\n if (nextPlayer < 0) nextPlayer += players.length;\n \n // Update the game state\n const updatedGameState: GameState = {\n ...gameState,\n players: updatedPlayers,\n currentPlayer: nextPlayer,\n lastAction: `Player ${playerIndex + 1} drew a card`\n };\n \n return {\n gameState: updatedGameState,\n success: true\n };\n}\n\n// Call UNO\nexport function callUno(gameState: GameState, playerId: string): { gameState: GameState, success: boolean, error?: string } {\n const { players } = gameState;\n \n const playerIndex = players.findIndex(p => p.id === playerId);\n if (playerIndex === -1) {\n return {\n gameState,\n success: false,\n error: \"Player not found\"\n };\n }\n \n // Check if the player has exactly one card\n if (players[playerIndex].hand.length !== 1) {\n return {\n gameState,\n success: false,\n error: \"You can only call UNO when you have one card left\"\n };\n }\n \n // Update the player's UNO status\n const updatedPlayers = [...players];\n updatedPlayers[playerIndex].calledUno = true;\n \n // Update the game state\n const updatedGameState: GameState = {\n ...gameState,\n players: updatedPlayers,\n lastAction: `Player ${playerIndex + 1} called UNO!`\n };\n \n return {\n gameState: updatedGameState,\n success: true\n };\n}\n\n// Challenge a player who didn't call UNO\nexport function challengeUno(\n gameState: GameState, \n playerId: string, \n targetPlayerId: string\n): { gameState: GameState, success: boolean, error?: string } {\n const { players, deck } = gameState;\n \n const targetPlayerIndex = players.findIndex(p => p.id === targetPlayerId);\n if (targetPlayerIndex === -1) {\n return {\n gameState,\n success: false,\n error: \"Target player not found\"\n };\n }\n \n // Check if the target player has exactly one card and didn't call UNO\n if (players[targetPlayerIndex].hand.length !== 1 || players[targetPlayerIndex].calledUno) {\n return {\n gameState,\n success: false,\n error: \"Cannot challenge this player\"\n };\n }\n \n // Target player draws 2 cards\n const updatedPlayers = [...players];\n const updatedDeck = [...deck];\n \n for (let i = 0; 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