daggerheart/module/helpers/handlebarsHelper.mjs

import { itemAbleRollParse } from './utils.mjs';

export default class RegisterHandlebarsHelpers {
    static registerHelpers() {
        Handlebars.registerHelper({
            add: this.add,
            includes: this.includes,
            times: this.times,
            damageFormula: this.damageFormula,
            formulaValue: this.formulaValue,
            damageSymbols: this.damageSymbols,
            rollParsed: this.rollParsed,
            hasProperty: foundry.utils.hasProperty,
            getProperty: foundry.utils.getProperty,
            setVar: this.setVar,
            empty: this.empty,
            pluralize: this.pluralize
        });
    }
    static add(a, b) {
        const aNum = Number.parseInt(a);
        const bNum = Number.parseInt(b);
        return (Number.isNaN(aNum) ? 0 : aNum) + (Number.isNaN(bNum) ? 0 : bNum);
    }

    static includes(list, item) {
        return list.includes(item);
    }

    static times(nr, block) {
        var accum = '';
        for (var i = 0; i < nr; ++i) accum += block.fn(i);
        return accum;
    }

    static damageFormula(attack, actor) {
        const traitTotal = actor.system.traits?.[attack.roll.trait]?.value;
        const instances = [
            attack.damage.parts.map(x => Roll.replaceFormulaData(x.value.getFormula(), actor)).join(' + '),
            traitTotal
        ].filter(x => x);

        return instances.join(traitTotal > 0 ? ' + ' : ' - ');
    }

    static formulaValue(formula, item) {
        if (isNaN(formula)) {
            const data = item.getRollData.bind(item)(),
                roll = new Roll(Roll.replaceFormulaData(formula, data)).evaluateSync();
            formula = roll.total;
        }
        return formula;
    }

    static damageSymbols(damageParts) {
        const symbols = [...new Set(damageParts.reduce((a, c) => a.concat([...c.type]), []))].map(
            p => CONFIG.DH.GENERAL.damageTypes[p].icon
        );
        return new Handlebars.SafeString(Array.from(symbols).map(symbol => `<i class="fa-solid ${symbol}"></i>`));
    }

    static rollParsed(value, actor, item, numerical) {
        const isNumerical = typeof numerical === 'boolean' ? numerical : false;
        const result = itemAbleRollParse(value, actor?.getRollData() ?? {}, item);
        return isNumerical ? (!result ? 0 : Number(result)) : result;
    }

    static setVar(name, value) {
        this[name] = value;
    }

    static empty(object) {
        if (!(typeof object === 'object')) return true;
        return Object.keys(object).length === 0;
    }

    /**
     * Pluralize helper that returns the appropriate localized string based on count
     * @param {number} count - The number to check for plurality 
     * @param {string} baseKey - The base localization key (e.g., "DAGGERHEART.GENERAL.Target")
     * @returns {string} The localized singular or plural string
     * 
     * Usage: {{pluralize currentTargets.length "DAGGERHEART.GENERAL.Target"}}
     * Returns: "Target" if count is exactly 1, "Targets" if count is 0, 2+, or invalid
     */
    static pluralize(count, baseKey) {
        const numericCount = Number(count);
        const isSingular = !isNaN(numericCount) && numericCount === 1;
        const key = isSingular ? `${baseKey}.single` : `${baseKey}.plural`;
        return game.i18n.localize(key);
    }
}