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import { inject, injectable, postConstruct } from 'inversify';
import { ServiceIdentifiers } from '../container/ServiceIdentifiers';
import md5 from 'md5';
import { Chance } from 'chance';
import { IInitializable } from '../interfaces/IInitializable';
import { IOptions } from '../interfaces/options/IOptions';
import { IRandomGenerator } from '../interfaces/utils/IRandomGenerator';
import { ISourceCode } from '../interfaces/source-code/ISourceCode';
import { initializable } from '../decorators/Initializable';
import { alphabetString } from '../constants/AlphabetString';
import { alphabetStringUppercase } from '../constants/AlphabetStringUppercase';
@injectable()
export class RandomGenerator implements IRandomGenerator, IInitializable {
/**
* @type {string}
*/
public static readonly randomGeneratorPool: string = `${alphabetString}${alphabetStringUppercase}`;
/**
* @type {Chance.Chance}
*/
@initializable()
private randomGenerator!: Chance.Chance;
/**
* @type {IOptions}
*/
private readonly options: IOptions;
/**
* @type {ISourceCode}
*/
private readonly sourceCode: ISourceCode;
/**
* @param {ISourceCode} sourceCode
* @param {IOptions} options
*/
public constructor (
@inject(ServiceIdentifiers.ISourceCode) sourceCode: ISourceCode,
@inject(ServiceIdentifiers.IOptions) options: IOptions
) {
this.sourceCode = sourceCode;
this.options = options;
}
@postConstruct()
public initialize (): void {
this.randomGenerator = new Chance(this.getRawSeed());
}
/**
* @returns {number}
*/
public getMathRandom (): number {
return this.getRandomInteger(0, 99999) / 100000;
}
/**
* @returns {Chance.Chance}
*/
public getRandomGenerator (): Chance.Chance {
return this.randomGenerator;
}
/**
* @param {number} min
* @param {number} max
* @returns {number}
*/
public getRandomInteger (min: number, max: number): number {
return this.getRandomGenerator().integer({
min: min,
max: max
});
}
/**
* @param {number} min
* @param {number} max
* @param {number[]} valuesToExclude
* @returns {number}
*/
public getRandomIntegerExcluding (min: number, max: number, valuesToExclude: number[]): number {
const valuesToPickArray: number[] = [];
for (let value: number = min; value <= max; value++) {
if (valuesToExclude.includes(value)) {
continue;
}
valuesToPickArray.push(value);
}
return this.randomGenerator.pickone(valuesToPickArray);
}
/**
* @param {number} length
* @param {string} pool
* @returns {string}
*/
public getRandomString (length: number, pool: string = RandomGenerator.randomGeneratorPool): string {
return this.getRandomGenerator().string({ length, pool });
}
/**
* @returns {string}
*/
public getInputSeed (): string {
return this.options.seed.toString();
}
/**
* We need to add numbers from md5 hash of source code to input seed to prevent same String Array name
* for different bundles with same seed
*
* @returns {number}
*/
public getRawSeed (): string {
const inputSeed: string = this.getInputSeed();
const inputSeedParts: string[] = `${inputSeed}`.split('|');
if (inputSeedParts.length > 1) {
return inputSeed;
}
const sourceCodeMD5Hash: string = md5(this.sourceCode.getSourceCode());
return `${inputSeed}|${sourceCodeMD5Hash}`;
}
}
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