"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.randomTag = exports.make = exports.RandomTypeId = void 0;
var Chunk = _interopRequireWildcard(require("../Chunk.js"));
var Context = _interopRequireWildcard(require("../Context.js"));
var _Function = require("../Function.js");
var Hash = _interopRequireWildcard(require("../Hash.js"));
var PCGRandom = _interopRequireWildcard(require("../Utils.js"));
var core = _interopRequireWildcard(require("./core.js"));
function _interopRequireWildcard(e, t) { if ("function" == typeof WeakMap) var r = new WeakMap(), n = new WeakMap(); return (_interopRequireWildcard = function (e, t) { if (!t && e && e.__esModule) return e; var o, i, f = { __proto__: null, default: e }; if (null === e || "object" != typeof e && "function" != typeof e) return f; if (o = t ? n : r) { if (o.has(e)) return o.get(e); o.set(e, f); } for (const t in e) "default" !== t && {}.hasOwnProperty.call(e, t) && ((i = (o = Object.defineProperty) && Object.getOwnPropertyDescriptor(e, t)) && (i.get || i.set) ? o(f, t, i) : f[t] = e[t]); return f; })(e, t); }
/** @internal */
const RandomSymbolKey = "effect/Random";
/** @internal */
const RandomTypeId = exports.RandomTypeId = /*#__PURE__*/Symbol.for(RandomSymbolKey);
/** @internal */
const randomTag = exports.randomTag = /*#__PURE__*/Context.GenericTag("effect/Random");
/** @internal */
class RandomImpl {
seed;
[RandomTypeId] = RandomTypeId;
PRNG;
constructor(seed) {
this.seed = seed;
this.PRNG = new PCGRandom.PCGRandom(seed);
}
get next() {
return core.sync(() => this.PRNG.number());
}
get nextBoolean() {
return core.map(this.next, n => n > 0.5);
}
get nextInt() {
return core.sync(() => this.PRNG.integer(Number.MAX_SAFE_INTEGER));
}
nextRange(min, max) {
return core.map(this.next, n => (max - min) * n + min);
}
nextIntBetween(min, max) {
return core.sync(() => this.PRNG.integer(max - min) + min);
}
shuffle(elements) {
return shuffleWith(elements, n => this.nextIntBetween(0, n));
}
}
const shuffleWith = (elements, nextIntBounded) => {
return core.suspend(() => (0, _Function.pipe)(core.sync(() => Array.from(elements)), core.flatMap(buffer => {
const numbers = [];
for (let i = buffer.length; i >= 2; i = i - 1) {
numbers.push(i);
}
return (0, _Function.pipe)(numbers, core.forEachSequentialDiscard(n => (0, _Function.pipe)(nextIntBounded(n), core.map(k => swap(buffer, n - 1, k)))), core.as(Chunk.fromIterable(buffer)));
})));
};
const swap = (buffer, index1, index2) => {
const tmp = buffer[index1];
buffer[index1] = buffer[index2];
buffer[index2] = tmp;
return buffer;
};
const make = seed => new RandomImpl(Hash.hash(seed));
exports.make = make;
//# sourceMappingURL=random.js.map