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/*
Spacebar: A FOSS re-implementation and extension of the Discord.com backend.
Copyright (C) 2026 Spacebar and Spacebar Contributors
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
// Inspired by dotnet: https://learn.microsoft.com/en-us/dotnet/api/system.random?view=net-9.0#methods
export class Random {
public static nextInt(min?: number, max?: number): number {
if (min === undefined && max === undefined) {
// Next()
return Math.floor(Math.random() * Number.MAX_SAFE_INTEGER);
} else if (max === undefined) {
// Next(Int32)
if (min! <= 0) throw new RangeError("min must be greater than 0");
return Math.floor(Math.random() * min!);
} else {
// Next(Int32, Int32)
if (min! >= max!) throw new RangeError("min must be less than max");
return Math.floor(Math.random() * (max! - min!)) + min!;
}
}
public static nextDouble(min?: number, max?: number): number {
if (min === undefined && max === undefined) {
// NextDouble()
return Math.random();
} else if (max === undefined) {
// NextDouble(Double)
if (min! <= 0) throw new RangeError("min must be greater than 0");
return Math.random() * min!;
} else {
// NextDouble(Double, Double)
if (min! >= max!) throw new RangeError("min must be less than max");
return Math.random() * (max! - min!) + min!;
}
}
public static nextBytes(count: number): Uint8Array {
if (count <= 0) throw new RangeError("count must be greater than 0");
const arr = new Uint8Array(count);
for (let i = 0; i < count; i++) {
arr[i] = Math.floor(Math.random() * 256);
}
return arr;
}
public static nextBytesArray(count: number) {
if (count <= 0) throw new RangeError("count must be greater than 0");
const arr = [];
for (let i = 0; i < count; i++) {
arr.push(Math.floor(Math.random() * 256));
}
return arr;
}
public static getItems<T>(items: T[], count: number): T[] {
if (count <= 0) throw new RangeError("count must be greater than 0");
if (count >= items.length) return this.shuffle(items);
const usedIndices = new Set<number>();
const result: T[] = [];
while (result.length < count && usedIndices.size < items.length) {
const index = Math.floor(Math.random() * items.length);
if (!usedIndices.has(index)) {
usedIndices.add(index);
result.push(items[index]);
}
}
return result;
}
public static shuffle<T>(items: T[]): T[] {
const array = [...items];
for (let i = array.length - 1; i > 0; i--) {
const j = Math.floor(Math.random() * (i + 1));
[array[i], array[j]] = [array[j], array[i]];
}
return array;
}
}
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