import escapeRegExp from 'lodash/escapeRegExp';
import { empty }    from '../constants';

type Options = {
    /** The opening field delimiter */
    open?: string;
    /** The closing field delimiter */
    close?: string;
};

/**
 * Fill a template with supplies values
 * @param input The template
 * @param values A dictionary of name-values used to fill in values in the template
 * @param __namedParameters see {@link Options}
 * @default open '{{'
 * @default close (default '}}')
 * @return template with values replaced
 */
export function fillTemplate(input: string, values: Record<string, string | undefined>, { open = '{{', close = '}}' }: Options = {}): string {
    // eslint-disable-next-line @typescript-eslint/prefer-regexp-exec
    for(const match of input.match(new RegExp(`${escapeRegExp(open)}(.+?)${escapeRegExp(close)}`, 'ug')) ?? []) {
        const key = match.slice(open.length, -close.length).trim();
        input = input.replace(match, values[key] ?? empty);
    }
    return input;
}

export default fillTemplate;