DiceBag -> Phase 4 (extra credit 1)

DiceBag.js

import {sum} from './ArrayUtils'
import seedrandom from 'seedrandom'

export const d6 = (generator = Math.random) => {
    return rollDice(1, 6, generator);
}

export const rollDiceSets = (diceSets, generator = Math.random) => {
    let setResults = [];
    for(let i = 0;i<=(diceSets.length - 1);i++) {
        const diceSet = diceSets[i];
        setResults.push(rollDice(diceSet.numOfDice, diceSet.numOfSides, generator));
    }
    return {
        total: sum(setResults.map(x => x.total)),
        setResults: setResults
    };
}

export const rollDice = (numOfDice, numOfSides, generator = Math.random) => {
    if (numOfDice > 100000) throw new Exception("Max dice of 10000 exceeded");
    if (numOfSides > 100000) throw new Exception("Max sides of 10000 exceeded");
    let individualResults = [];
    for(let i = 1;i <= numOfDice;i++) {
        const result = Math.floor(generator() * numOfSides) + 1;
        individualResults.push(result);
    }
    return {
        total: sum(individualResults),
        individualResults: individualResults
    };
}

export const DiceBag = {
    d6: d6,
    rollDice: rollDice,
    rollDiceSets: rollDiceSets
};

export const DiceBagWithSeed = (seed) => {
    const generator = new seedrandom(seed);
    return {
        d6: () => {
            return d6(generator);
        },
        rollDice: (numOfDice, numOfSides) => {
            return rollDice(numOfDice, numOfSides, generator);
        },
        rollDiceSets: (diceSets) => {
            return rollDiceSets(diceSets, generator);
        }
    }
}

export default DiceBag;