tripeaks-solitaire-solver-j.../solver.js

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JavaScript
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class Card {
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constructor(cardString) {
this.rank = cardString[0];
this.suit = cardString[1];
}
/**
* Gets the face value of the card, from [0 .. 12].
* @returns {number} The value.
*/
get integerValue() {
return "A23456789TJQK".indexOf(this.rank);
}
/**
* Returns true if the other card has a face value one above or below this card.
* @param card Another card.
* @returns {boolean} True if sequential, false otherwise.
*/
isSequential(card) {
return (
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(this.integerValue + 13 + 1) % 13 === card.integerValue ||
(this.integerValue + 13 - 1) % 13 === card.integerValue
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);
}
get toString() {
return this.rank + this.suit;
}
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}
class Pyramid {
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constructor(pyramidArray) {
this.array = pyramidArray;
}
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get isCleared() {
return this.array.every((c) => c === 0);
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}
get freeCardIndices() {
let freeIndices = [];
for (let i = this.array.length - 1; i >= 0; i--) {
if (this.array[i] === 0) continue;
const secondOffset = Math.floor((i - 3) / 2);
// This is the last row
if (i >= 18) freeIndices.push(i);
// Third row
else if (
i <= 17 &&
i >= 9 &&
this.array[i + 9] === 0 &&
this.array[i + 10] === 0
)
freeIndices.push(i);
// Second row
else if (
i <= 8 &&
i >= 3 &&
this.array[i + 6 + secondOffset] === 0 &&
this.array[i + 7 + secondOffset] === 0
)
freeIndices.push(i);
// First row
else if (
i <= 2 &&
i >= 0 &&
this.array[i + 3 + i] === 0 &&
this.array[i + 4 + i] === 0
)
freeIndices.push(i);
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}
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return freeIndices;
}
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}
class MoveString {
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static gameWon() {
return "You have won.";
}
static gameLost() {
return "There are no more valid moves.";
}
static match(cardA) {
return "Move " + cardA + " onto the stock.";
}
static flipStock() {
return "Draw a new stock card.";
}
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}
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const GameStates = Object.freeze({ won: true, lost: false });
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function getBestMoveArray(bestMoveArray, newMoveArray) {
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let bestMoveLength = bestMoveArray.filter((s) => s.startsWith("Move")).length;
let newMoveLength = newMoveArray.filter((s) => s.startsWith("Move")).length;
return newMoveLength > bestMoveLength ? newMoveArray : bestMoveArray;
}
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/**
* Solves a Tri Peaks solitaire game.
* @param pyramidArray The cards in the pyramids, starting in the top-left peak. The cards are in left-to-right, then top-to-bottom order.
* @param stockArray The cards in the stock.
* @param stockIndex The index of the top stock card.
* @param moveArray The list of moves that have been made to get a deck in this configuration.
* @returns {*[]|([*, *, *]|[*, *, *]|[*, *, *])}
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*/
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function solve(
pyramidArray,
stockArray,
stockIndex = 0,
moveArray = [],
bestMoveArray = []
) {
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let newMoveArray = JSON.parse(JSON.stringify(moveArray));
let newBestMoveArray = JSON.parse(JSON.stringify(bestMoveArray));
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let pyramid = new Pyramid(pyramidArray);
// We're in a new game state.
// Are the moves that brought us here better than the previous best moves we received?
// If yes, replace the known best move array
newBestMoveArray = getBestMoveArray(newBestMoveArray, newMoveArray);
newBestMoveArray = JSON.parse(JSON.stringify(newBestMoveArray));
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// We cleared the pyramid
if (pyramid.isCleared) {
newMoveArray.push(MoveString.gameWon());
return [GameStates.won, newMoveArray, []];
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}
// We have run out of stock cards
if (stockIndex >= stockArray.length) {
newMoveArray.push(MoveString.gameLost());
return [GameStates.lost, newMoveArray, newBestMoveArray];
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}
const topStock = new Card(stockArray[stockIndex]);
let freeCardsIndices = pyramid.freeCardIndices;
// match free cards with stock
for (let i = 0; i < freeCardsIndices.length; i++) {
let cardA = new Card(pyramidArray[freeCardsIndices[i]]);
if (!cardA.isSequential(topStock)) continue;
let newStock = JSON.parse(JSON.stringify(stockArray));
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newStock.splice(++stockIndex, 0, cardA.toString);
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newMoveArray = JSON.parse(JSON.stringify(moveArray));
newMoveArray.push(MoveString.match(cardA.toString));
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let newPyramidArray = JSON.parse(JSON.stringify(pyramidArray));
newPyramidArray[freeCardsIndices[i]] = 0;
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let result = solve(
newPyramidArray,
newStock,
stockIndex,
newMoveArray,
newBestMoveArray
);
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if (result[0] === GameStates.won) return result;
// if we didn't win from this move tree, let's grab the best move array
// if it's better than what we already have
newBestMoveArray = getBestMoveArray(newBestMoveArray, result[2]);
newBestMoveArray = JSON.parse(JSON.stringify(newBestMoveArray));
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}
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// Flip over a new card
newMoveArray = JSON.parse(JSON.stringify(moveArray));
newMoveArray.push(MoveString.flipStock());
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let result = solve(
pyramidArray,
stockArray,
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++stockIndex,
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newMoveArray,
newBestMoveArray
);
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if (result[0] === GameStates.won) return result;
// if we didn't win from this move tree, let's grab the best move array
// if it's better than what we already have
newBestMoveArray = getBestMoveArray(newBestMoveArray, result[2]);
newBestMoveArray = JSON.parse(JSON.stringify(newBestMoveArray));
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// This node was useless
return [GameStates.lost, moveArray, newBestMoveArray];
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}
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module.exports = { Card, solve };