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probabilities.js
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probabilities.js
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import { probabilityRates } from '$lib/data/warp-setup.json';
import { localrate } from '$lib/helpers/dataAPI/api-localstorage';
export const rates = ({
currentPity = 0,
maxPity = 90,
baseRate = 0.6,
rateIncreasedAt = 74
} = {}) => {
if (baseRate <= 0 && currentPity < maxPity) return 0;
if (currentPity < rateIncreasedAt) return baseRate;
if (currentPity >= maxPity) return 100;
const rateIncreasedBy = (100 - baseRate) / (maxPity + 1 - rateIncreasedAt);
const rateBeforeCurrentPity = (currentPity + 1 - rateIncreasedAt) * rateIncreasedBy;
const increasedRate = rateBeforeCurrentPity + baseRate;
return increasedRate;
};
// Random Item by probability
export const prob = (items) => {
let chances = [];
for (let i = 0; i < items.length; i++) {
chances[i] = items[i].chance + (chances[i - 1] || 0);
}
const random = Math.random() * chances[chances.length - 1];
const result = items[chances.findIndex((chance) => chance > random)];
return result;
};
// Read Custom Probability
export const getRate = (banner, key) => {
if (banner === 'starter') {
const initial = probabilityRates['character-event'];
return initial[key];
}
const initial = probabilityRates[banner];
const local = localrate.get(banner);
if (!(local[key] || local[key] >= 0)) return initial[key];
const val = parseFloat(local[key]);
if (isNaN(val)) return local[key];
return val;
};
export const setRate = (banner, key, val) => {
const local = localrate.get(banner);
if (typeof val === 'boolean') {
local[key] = val;
} else {
const value = parseFloat(val);
if (isNaN(value)) local[key] = val;
else local[key] = value;
}
localrate.set(banner, local);
};