544 lines
16 KiB
JavaScript
544 lines
16 KiB
JavaScript
(function () {
|
|
const STORAGE_KEY = "gallery.rankings.v1";
|
|
const STORAGE_TEST_KEY = `${STORAGE_KEY}.probe`;
|
|
const STATE_VERSION = 1;
|
|
const CLOSE_MATCH_COUNT = 6;
|
|
|
|
function $(id) {
|
|
return document.getElementById(id);
|
|
}
|
|
|
|
function escapeHtml(value) {
|
|
return String(value)
|
|
.replace(/&/g, "&")
|
|
.replace(/</g, "<")
|
|
.replace(/>/g, ">")
|
|
.replace(/"/g, """);
|
|
}
|
|
|
|
function formatRating(rating) {
|
|
return new Intl.NumberFormat("en-US", {
|
|
maximumFractionDigits: 0,
|
|
}).format(rating);
|
|
}
|
|
|
|
function pluralize(count, singular, plural) {
|
|
return count === 1 ? singular : plural;
|
|
}
|
|
|
|
function createPairKey(leftId, rightId) {
|
|
return [leftId, rightId].sort().join(":");
|
|
}
|
|
|
|
function createDefaultEntry(id, defaultRating) {
|
|
return {
|
|
id,
|
|
rating: defaultRating,
|
|
wins: 0,
|
|
losses: 0,
|
|
};
|
|
}
|
|
|
|
function cloneEntry(entry) {
|
|
return {
|
|
id: entry.id,
|
|
rating: entry.rating,
|
|
wins: entry.wins,
|
|
losses: entry.losses,
|
|
};
|
|
}
|
|
|
|
function roundRating(rating) {
|
|
return Math.round(rating * 1000) / 1000;
|
|
}
|
|
|
|
function pickRandom(items) {
|
|
return items[Math.floor(Math.random() * items.length)];
|
|
}
|
|
|
|
function parseSeedData() {
|
|
const seedElement = $("rankings-seed-data");
|
|
|
|
if (!seedElement) {
|
|
throw new Error("Missing rankings seed data");
|
|
}
|
|
|
|
const seedData = JSON.parse(seedElement.textContent);
|
|
|
|
if (!seedData || !Array.isArray(seedData.meals) || !seedData.elo) {
|
|
throw new Error("Invalid rankings seed data");
|
|
}
|
|
|
|
return seedData;
|
|
}
|
|
|
|
function createPersistence() {
|
|
let available = false;
|
|
|
|
try {
|
|
localStorage.setItem(STORAGE_TEST_KEY, "1");
|
|
localStorage.removeItem(STORAGE_TEST_KEY);
|
|
available = true;
|
|
} catch (error) {
|
|
available = false;
|
|
}
|
|
|
|
return {
|
|
get available() {
|
|
return available;
|
|
},
|
|
load() {
|
|
if (!available) {
|
|
return null;
|
|
}
|
|
|
|
try {
|
|
const raw = localStorage.getItem(STORAGE_KEY);
|
|
return raw ? JSON.parse(raw) : null;
|
|
} catch (error) {
|
|
return null;
|
|
}
|
|
},
|
|
save(state) {
|
|
if (!available) {
|
|
return;
|
|
}
|
|
|
|
try {
|
|
localStorage.setItem(STORAGE_KEY, JSON.stringify(state));
|
|
} catch (error) {
|
|
available = false;
|
|
}
|
|
},
|
|
clear() {
|
|
if (!available) {
|
|
return;
|
|
}
|
|
|
|
try {
|
|
localStorage.removeItem(STORAGE_KEY);
|
|
} catch (error) {
|
|
available = false;
|
|
}
|
|
},
|
|
};
|
|
}
|
|
|
|
function isValidStoredEntry(entry) {
|
|
if (!entry || typeof entry !== "object" || Array.isArray(entry)) {
|
|
return false;
|
|
}
|
|
|
|
if (typeof entry.id !== "string" || !/^\d+$/.test(entry.id)) {
|
|
return false;
|
|
}
|
|
|
|
if (typeof entry.rating !== "number" || !Number.isFinite(entry.rating) || entry.rating <= 0) {
|
|
return false;
|
|
}
|
|
|
|
return ["wins", "losses"].every(
|
|
(field) => Number.isInteger(entry[field]) && entry[field] >= 0
|
|
);
|
|
}
|
|
|
|
function createSeedState(seedData) {
|
|
return {
|
|
version: STATE_VERSION,
|
|
voteCount: 0,
|
|
lastPairKey: null,
|
|
updatedAt: null,
|
|
elo: {
|
|
defaultRating: seedData.elo.defaultRating,
|
|
kFactor: seedData.elo.kFactor,
|
|
entries: seedData.meals.map((meal) => {
|
|
const seedEntry =
|
|
seedData.elo.entries.find((entry) => entry.id === meal.id) ||
|
|
createDefaultEntry(meal.id, seedData.elo.defaultRating);
|
|
|
|
return cloneEntry(seedEntry);
|
|
}),
|
|
},
|
|
};
|
|
}
|
|
|
|
function syncStoredState(seedData, storedState) {
|
|
if (!storedState || typeof storedState !== "object" || Array.isArray(storedState)) {
|
|
return createSeedState(seedData);
|
|
}
|
|
|
|
const storedEntries = Array.isArray(storedState.elo?.entries)
|
|
? storedState.elo.entries.filter(isValidStoredEntry)
|
|
: [];
|
|
const storedEntryById = new Map(storedEntries.map((entry) => [entry.id, entry]));
|
|
const seedEntryById = new Map(seedData.elo.entries.map((entry) => [entry.id, entry]));
|
|
const entries = seedData.meals.map((meal) => {
|
|
const storedEntry = storedEntryById.get(meal.id);
|
|
|
|
if (storedEntry) {
|
|
return cloneEntry(storedEntry);
|
|
}
|
|
|
|
const seedEntry =
|
|
seedEntryById.get(meal.id) || createDefaultEntry(meal.id, seedData.elo.defaultRating);
|
|
|
|
return cloneEntry(seedEntry);
|
|
});
|
|
const derivedVoteCount = entries.reduce((sum, entry) => sum + entry.wins, 0);
|
|
|
|
return {
|
|
version: STATE_VERSION,
|
|
voteCount:
|
|
Number.isInteger(storedState.voteCount) && storedState.voteCount >= derivedVoteCount
|
|
? storedState.voteCount
|
|
: derivedVoteCount,
|
|
lastPairKey: typeof storedState.lastPairKey === "string" ? storedState.lastPairKey : null,
|
|
updatedAt: typeof storedState.updatedAt === "string" ? storedState.updatedAt : null,
|
|
elo: {
|
|
defaultRating: seedData.elo.defaultRating,
|
|
kFactor: seedData.elo.kFactor,
|
|
entries,
|
|
},
|
|
};
|
|
}
|
|
|
|
function compareRankedMeals(left, right) {
|
|
const leftMatches = left.wins + left.losses;
|
|
const rightMatches = right.wins + right.losses;
|
|
|
|
if (right.rating !== left.rating) {
|
|
return right.rating - left.rating;
|
|
}
|
|
|
|
if (rightMatches !== leftMatches) {
|
|
return rightMatches - leftMatches;
|
|
}
|
|
|
|
return Number.parseInt(left.id, 10) - Number.parseInt(right.id, 10);
|
|
}
|
|
|
|
function getRankedMeals(meals, eloData) {
|
|
const entryById = new Map(eloData.entries.map((entry) => [entry.id, entry]));
|
|
|
|
return meals
|
|
.map((meal) => {
|
|
const entry =
|
|
entryById.get(meal.id) || createDefaultEntry(meal.id, eloData.defaultRating);
|
|
|
|
return {
|
|
...meal,
|
|
rating: entry.rating,
|
|
wins: entry.wins,
|
|
losses: entry.losses,
|
|
matches: entry.wins + entry.losses,
|
|
};
|
|
})
|
|
.sort(compareRankedMeals);
|
|
}
|
|
|
|
function getRankingMeta(rankedMeal) {
|
|
const ratingText = `Elo ${formatRating(rankedMeal.rating)}`;
|
|
|
|
if (rankedMeal.matches === 0) {
|
|
return `${ratingText} | no votes yet`;
|
|
}
|
|
|
|
return `${ratingText} | ${rankedMeal.wins}-${rankedMeal.losses} record across ${
|
|
rankedMeal.matches
|
|
} ${pluralize(rankedMeal.matches, "match", "matches")}`;
|
|
}
|
|
|
|
function expectedScore(rating, opponentRating) {
|
|
return 1 / (1 + Math.pow(10, (opponentRating - rating) / 400));
|
|
}
|
|
|
|
function applyVote(seedData, state, winnerId, loserId, pairKey) {
|
|
const entryById = new Map(
|
|
state.elo.entries.map((entry) => [entry.id, cloneEntry(entry)])
|
|
);
|
|
const winner = entryById.get(winnerId);
|
|
const loser = entryById.get(loserId);
|
|
|
|
if (!winner || !loser) {
|
|
return state;
|
|
}
|
|
|
|
const winnerExpected = expectedScore(winner.rating, loser.rating);
|
|
const loserExpected = expectedScore(loser.rating, winner.rating);
|
|
|
|
winner.rating = roundRating(winner.rating + state.elo.kFactor * (1 - winnerExpected));
|
|
loser.rating = roundRating(loser.rating + state.elo.kFactor * (0 - loserExpected));
|
|
winner.wins += 1;
|
|
loser.losses += 1;
|
|
|
|
return {
|
|
...state,
|
|
voteCount: state.voteCount + 1,
|
|
lastPairKey: pairKey,
|
|
updatedAt: new Date().toISOString(),
|
|
elo: {
|
|
...state.elo,
|
|
entries: seedData.meals.map((meal) => entryById.get(meal.id)),
|
|
},
|
|
};
|
|
}
|
|
|
|
function choosePair(rankedMeals, avoidedPairKeys) {
|
|
if (rankedMeals.length < 2) {
|
|
return null;
|
|
}
|
|
|
|
const avoided = new Set(avoidedPairKeys.filter(Boolean));
|
|
const rankedOrder = new Map(rankedMeals.map((meal, index) => [meal.id, index]));
|
|
|
|
for (let attempt = 0; attempt < 20; attempt += 1) {
|
|
const baseMeal = rankedMeals[Math.floor(Math.random() * rankedMeals.length)];
|
|
const candidates = rankedMeals
|
|
.filter((meal) => meal.id !== baseMeal.id)
|
|
.sort((left, right) => {
|
|
const ratingGap = Math.abs(left.rating - baseMeal.rating) - Math.abs(right.rating - baseMeal.rating);
|
|
|
|
if (ratingGap !== 0) {
|
|
return ratingGap;
|
|
}
|
|
|
|
return (
|
|
Math.abs(rankedOrder.get(left.id) - rankedOrder.get(baseMeal.id)) -
|
|
Math.abs(rankedOrder.get(right.id) - rankedOrder.get(baseMeal.id))
|
|
);
|
|
});
|
|
const closeCandidates = candidates.slice(0, Math.min(CLOSE_MATCH_COUNT, candidates.length));
|
|
const filteredCandidates = closeCandidates.filter(
|
|
(meal) => !avoided.has(createPairKey(baseMeal.id, meal.id))
|
|
);
|
|
const candidatePool =
|
|
filteredCandidates.length > 0
|
|
? filteredCandidates
|
|
: candidates.filter((meal) => !avoided.has(createPairKey(baseMeal.id, meal.id)));
|
|
const fallbackPool = candidatePool.length > 0 ? candidatePool : candidates;
|
|
const opponent = pickRandom(
|
|
fallbackPool.slice(0, Math.min(CLOSE_MATCH_COUNT, fallbackPool.length))
|
|
);
|
|
|
|
if (opponent) {
|
|
return Math.random() < 0.5
|
|
? { left: baseMeal, right: opponent }
|
|
: { left: opponent, right: baseMeal };
|
|
}
|
|
}
|
|
|
|
return {
|
|
left: rankedMeals[0],
|
|
right: rankedMeals[1],
|
|
};
|
|
}
|
|
|
|
function renderDuelCard(meal, sideLabel) {
|
|
return `<article class="duel-card">
|
|
<button class="duel-card__button" type="button" data-meal-id="${meal.id}">
|
|
<div class="duel-card__media">
|
|
<img src="images/fulls/${meal.id}.jpg" alt="${escapeHtml(`${meal.title} photo`)}" />
|
|
</div>
|
|
<div class="duel-card__body">
|
|
<p class="duel-card__label">${escapeHtml(sideLabel)}</p>
|
|
<h3 class="duel-card__title">${escapeHtml(meal.title)}</h3>
|
|
<p class="duel-card__meta">${escapeHtml(getRankingMeta(meal))}</p>
|
|
<p class="duel-card__description">${escapeHtml(meal.description)}</p>
|
|
<span class="duel-card__cta">Choose this meal</span>
|
|
</div>
|
|
</button>
|
|
<a class="duel-card__open" href="images/fulls/${meal.id}.jpg" target="_blank" rel="noreferrer">open full image</a>
|
|
</article>`;
|
|
}
|
|
|
|
function renderRankingCard(meal, placement) {
|
|
return `<article class="ranking-card">
|
|
<p class="ranking-card__placement">#${placement}</p>
|
|
<a class="ranking-card__thumbnail" href="images/fulls/${meal.id}.jpg">
|
|
<img src="images/thumbs/${meal.id}.jpg" alt="${escapeHtml(`${meal.title} thumbnail`)}" loading="lazy" />
|
|
</a>
|
|
<div class="ranking-card__body">
|
|
<h2>${escapeHtml(meal.title)}</h2>
|
|
<p class="ranking-card__meta">${escapeHtml(getRankingMeta(meal))}</p>
|
|
<p>${escapeHtml(meal.description)}</p>
|
|
</div>
|
|
</article>`;
|
|
}
|
|
|
|
function getSummaryText(seedData, state, persistence) {
|
|
const voteText = `${state.voteCount} ${pluralize(state.voteCount, "vote", "votes")}`;
|
|
|
|
if (persistence.available) {
|
|
return `${seedData.meals.length} meals ranked. ${voteText} saved in this browser.`;
|
|
}
|
|
|
|
return `${seedData.meals.length} meals ranked. ${voteText} active for this session only.`;
|
|
}
|
|
|
|
function getStatusText(persistence) {
|
|
if (persistence.available) {
|
|
return "Votes are saved in this browser on this device.";
|
|
}
|
|
|
|
return "Browser storage is unavailable, so votes reset when you reload.";
|
|
}
|
|
|
|
function init() {
|
|
let seedData;
|
|
|
|
try {
|
|
seedData = parseSeedData();
|
|
} catch (error) {
|
|
console.error(error);
|
|
return;
|
|
}
|
|
|
|
const elements = {
|
|
duelCards: $("duel-cards"),
|
|
rankings: $("rankings"),
|
|
rankingSummary: document.querySelector("#rankings-summary .ranking-summary"),
|
|
voteStatus: $("vote-status"),
|
|
voteMessage: $("vote-message"),
|
|
skipPair: $("skip-pair"),
|
|
resetRankings: $("reset-rankings"),
|
|
};
|
|
|
|
if (
|
|
!elements.duelCards ||
|
|
!elements.rankings ||
|
|
!elements.rankingSummary ||
|
|
!elements.voteStatus ||
|
|
!elements.voteMessage ||
|
|
!elements.skipPair ||
|
|
!elements.resetRankings
|
|
) {
|
|
return;
|
|
}
|
|
|
|
const persistence = createPersistence();
|
|
let state = syncStoredState(seedData, persistence.load());
|
|
let currentPair = null;
|
|
let currentPairKey = null;
|
|
let lastMessage = "Choose the better meal to start ranking.";
|
|
|
|
persistence.save(state);
|
|
|
|
function queueNextPair(rankedMeals) {
|
|
currentPair = choosePair(rankedMeals, [currentPairKey, state.lastPairKey]);
|
|
currentPairKey = currentPair
|
|
? createPairKey(currentPair.left.id, currentPair.right.id)
|
|
: null;
|
|
}
|
|
|
|
function render(message) {
|
|
const rankedMeals = getRankedMeals(seedData.meals, state.elo);
|
|
|
|
if (message) {
|
|
lastMessage = message;
|
|
}
|
|
|
|
if (
|
|
!currentPair ||
|
|
!rankedMeals.some((meal) => meal.id === currentPair.left.id) ||
|
|
!rankedMeals.some((meal) => meal.id === currentPair.right.id)
|
|
) {
|
|
queueNextPair(rankedMeals);
|
|
}
|
|
|
|
elements.voteStatus.textContent = getStatusText(persistence);
|
|
elements.voteMessage.textContent = lastMessage;
|
|
elements.rankingSummary.textContent = getSummaryText(seedData, state, persistence);
|
|
elements.rankings.innerHTML = rankedMeals
|
|
.map((meal, index) => renderRankingCard(meal, index + 1))
|
|
.join("");
|
|
|
|
if (!currentPair) {
|
|
elements.duelCards.innerHTML =
|
|
'<p class="duel-placeholder">Add at least two meals before starting head-to-head voting.</p>';
|
|
elements.skipPair.disabled = true;
|
|
return;
|
|
}
|
|
|
|
elements.skipPair.disabled = false;
|
|
elements.duelCards.innerHTML = [
|
|
renderDuelCard(currentPair.left, "Left Pick"),
|
|
renderDuelCard(currentPair.right, "Right Pick"),
|
|
].join("");
|
|
}
|
|
|
|
function handleVote(winnerId) {
|
|
if (!currentPair) {
|
|
return;
|
|
}
|
|
|
|
const loserId = currentPair.left.id === winnerId ? currentPair.right.id : currentPair.left.id;
|
|
const winnerTitle =
|
|
currentPair.left.id === winnerId ? currentPair.left.title : currentPair.right.title;
|
|
const loserTitle =
|
|
currentPair.left.id === winnerId ? currentPair.right.title : currentPair.left.title;
|
|
|
|
state = applyVote(seedData, state, winnerId, loserId, currentPairKey);
|
|
persistence.save(state);
|
|
currentPair = null;
|
|
render(`Picked ${winnerTitle} over ${loserTitle}.`);
|
|
}
|
|
|
|
elements.duelCards.addEventListener("click", (event) => {
|
|
const button = event.target.closest("[data-meal-id]");
|
|
|
|
if (!button) {
|
|
return;
|
|
}
|
|
|
|
handleVote(button.getAttribute("data-meal-id"));
|
|
});
|
|
|
|
elements.skipPair.addEventListener("click", () => {
|
|
const rankedMeals = getRankedMeals(seedData.meals, state.elo);
|
|
|
|
queueNextPair(rankedMeals);
|
|
render("Skipped that pair.");
|
|
});
|
|
|
|
elements.resetRankings.addEventListener("click", () => {
|
|
if (!window.confirm("Reset the local Elo votes saved in this browser?")) {
|
|
return;
|
|
}
|
|
|
|
state = createSeedState(seedData);
|
|
persistence.clear();
|
|
persistence.save(state);
|
|
currentPair = null;
|
|
currentPairKey = null;
|
|
render("Local votes cleared. Back to the seeded board.");
|
|
});
|
|
|
|
document.addEventListener("keydown", (event) => {
|
|
const target = event.target;
|
|
|
|
if (
|
|
target &&
|
|
["INPUT", "TEXTAREA", "SELECT", "BUTTON"].includes(target.tagName)
|
|
) {
|
|
return;
|
|
}
|
|
|
|
if (!currentPair) {
|
|
return;
|
|
}
|
|
|
|
if (event.key === "ArrowLeft") {
|
|
event.preventDefault();
|
|
handleVote(currentPair.left.id);
|
|
} else if (event.key === "ArrowRight") {
|
|
event.preventDefault();
|
|
handleVote(currentPair.right.id);
|
|
}
|
|
});
|
|
|
|
render();
|
|
}
|
|
|
|
init();
|
|
})();
|