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import { invalid } from '@sveltejs/kit';
import { words, allowed } from './words.server';
import type { PageServerLoad, Actions } from './$types';
export const load: PageServerLoad = ({ cookies }) => {
const game = new Game(cookies.get('sverdle'));
return {
/**
* The player's guessed words so far
*/
guesses: game.guesses,
/**
* An array of strings like '__x_c' corresponding to the guesses, where 'x' means
* an exact match, and 'c' means a close match (right letter, wrong place)
*/
answers: game.answers,
/**
* The correct answer, revealed if the game is over
*/
answer: game.answers.length >= 6 ? game.answer : null
};
};
export const actions: Actions = {
/**
* Modify game state in reaction to a keypress. If client-side JavaScript
* is available, this will happen in the browser instead of here
*/
update: async ({ request, cookies }) => {
const game = new Game(cookies.get('sverdle'));
const data = await request.formData();
const key = data.get('key');
const i = game.answers.length;
if (key === 'backspace') {
game.guesses[i] = game.guesses[i].slice(0, -1);
} else {
game.guesses[i] += key;
}
cookies.set('sverdle', game.toString());
},
/**
* Modify game state in reaction to a guessed word. This logic always runs on
* the server, so that people can't cheat by peeking at the JavaScript
*/
enter: async ({ request, cookies }) => {
const game = new Game(cookies.get('sverdle'));
const data = await request.formData();
const guess = data.getAll('guess') as string[];
if (!game.enter(guess)) {
return invalid(400, { badGuess: true });
}
cookies.set('sverdle', game.toString());
},
restart: async ({ cookies }) => {
cookies.delete('sverdle');
}
};
class Game {
index: number;
guesses: string[];
answers: string[];
answer: string;
/**
* Create a game object from the player's cookie, or initialise a new game
*/
constructor(serialized: string | undefined) {
if (serialized) {
const [index, guesses, answers] = serialized.split('-');
this.index = +index;
this.guesses = guesses ? guesses.split(' ') : [];
this.answers = answers ? answers.split(' ') : [];
} else {
this.index = Math.floor(Math.random() * words.length);
this.guesses = ['', '', '', '', '', ''];
this.answers = [] ;
}
this.answer = words[this.index];
}
/**
* Update game state based on a guess of a five-letter word. Returns
* true if the guess was valid, false otherwise
*/
enter(letters: string[]) {
const word = letters.join('');
const valid = allowed.has(word);
if (!valid) return false;
this.guesses[this.answers.length] = word;
const available = Array.from(this.answer);
const answer = Array(5).fill('_');
// first, find exact matches
for (let i = 0; i < 5; i += 1) {
if (letters[i] === available[i]) {
answer[i] = 'x';
available[i] = ' ';
}
}
// then find close matches (this has to happen
// in a second step, otherwise an early close
// match can prevent a later exact match)
for (let i = 0; i < 5; i += 1) {
if (answer[i] === '_') {
const index = available.indexOf(letters[i]);
if (index !== -1) {
answer[i] = 'c';
available[index] = ' ';
}
}
}
this.answers.push(answer.join(''));
return true;
}
/**
* Serialize game state so it can be set as a cookie
*/
toString() {
return `${this.index}-${this.guesses.join(' ')}-${this.answers.join(' ')}`;
}
}
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