import { ParsingContext } from "../../../chrono";
import { parseDuration, TIME_UNITS_PATTERN } from "../constants";
import { ParsingComponents } from "../../../results";
import { AbstractParserWithWordBoundaryChecking } from "../../../common/parsers/AbstractParserWithWordBoundary";

// 2 ng\u00e0y sau  |  3 tu\u1ea7n n\u1eefa  |  1 th\u00e1ng t\u1edbi
const PATTERN = new RegExp(
    "(" + TIME_UNITS_PATTERN + ")" + "\\s{0,5}(?:sau|n\u1eefa|t\u1edbi|ti\u1ebfp)(?=\\W|$)",
    "i"
);
export default class VITimeUnitLaterFormatParser extends AbstractParserWithWordBoundaryChecking {
    constructor(private strictMode = false) {
        super();
    }
    innerPattern(): RegExp {
        // VI has no unit abbreviations, so strict and casual patterns are identical.
        return PATTERN;
    }

    innerExtract(context: ParsingContext, match: RegExpMatchArray): ParsingComponents {
        const duration = parseDuration(match[1]);
        if (!duration) return null;
        return ParsingComponents.createRelativeFromReference(context.reference, duration);
    }
}