RocketChat/Rocket.Chat

import type { Block } from '../blocks/Block';
import { LayoutBlockType } from '../blocks/LayoutBlockType';
import type { ConditionalBlock } from '../blocks/layout/ConditionalBlock';
import type { Conditions } from './Conditions';

const conditionsMatch = (conditions: Conditions | undefined = undefined, filters: ConditionalBlock['when'] = {}): boolean => {
    if (!conditions) {
        return true;
    }

    if (Array.isArray(filters.engine) && !filters.engine.includes(conditions.engine)) {
        return false;
    }

    return true;
};

export const resolveConditionalBlocks =
    (conditions?: Conditions) =>
    (block: Block): readonly Block[] => {
        if (block.type !== LayoutBlockType.CONDITIONAL) {
            return [block];
        }

        if (conditionsMatch(conditions, block.when)) {
            return block.render;
        }

        return [];
    };