76 lines
1.7 KiB
TypeScript
76 lines
1.7 KiB
TypeScript
import { words, allowed } from './words.server';
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export class Game {
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index: number;
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guesses: string[];
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answers: string[];
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answer: string;
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/**
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* Create a game object from the player's cookie, or initialise a new game
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*/
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constructor(serialized: string | undefined = undefined) {
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if (serialized) {
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const [index, guesses, answers] = serialized.split('-');
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this.index = +index;
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this.guesses = guesses ? guesses.split(' ') : [];
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this.answers = answers ? answers.split(' ') : [];
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} else {
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this.index = Math.floor(Math.random() * words.length);
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this.guesses = ['', '', '', '', '', ''];
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this.answers = [];
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}
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this.answer = words[this.index];
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}
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/**
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* Update game state based on a guess of a five-letter word. Returns
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* true if the guess was valid, false otherwise
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*/
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enter(letters: string[]) {
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const word = letters.join('');
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const valid = allowed.has(word);
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if (!valid) return false;
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this.guesses[this.answers.length] = word;
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const available = Array.from(this.answer);
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const answer = Array(5).fill('_');
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// first, find exact matches
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for (let i = 0; i < 5; i += 1) {
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if (letters[i] === available[i]) {
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answer[i] = 'x';
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available[i] = ' ';
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}
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}
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// then find close matches (this has to happen
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// in a second step, otherwise an early close
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// match can prevent a later exact match)
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for (let i = 0; i < 5; i += 1) {
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if (answer[i] === '_') {
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const index = available.indexOf(letters[i]);
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if (index !== -1) {
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answer[i] = 'c';
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available[index] = ' ';
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}
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}
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}
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this.answers.push(answer.join(''));
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return true;
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}
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/**
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* Serialize game state so it can be set as a cookie
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*/
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toString() {
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return `${this.index}-${this.guesses.join(' ')}-${this.answers.join(' ')}`;
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}
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}
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