import { ParsingContext } from "../../../chrono";
import { ParsingComponents, ParsingResult } from "../../../results";
import { Meridiem } from "../../../types";
import { AbstractParserWithWordBoundaryChecking } from "../../../common/parsers/AbstractParserWithWordBoundary";
import { assignSimilarDate } from "../../../utils/dates";
import * as references from "../../../common/casualReferences";

export default class FRCasualDateParser extends AbstractParserWithWordBoundaryChecking {
    innerPattern(context: ParsingContext): RegExp {
        return /(maintenant|aujourd'hui|demain|hier|cette\s*nuit|la\s*veille)(?=\W|$)/i;
    }

    innerExtract(context: ParsingContext, match: RegExpMatchArray): ParsingComponents | ParsingResult {
        const targetDate = context.refDate;
        const lowerText = match[0].toLowerCase();
        const component = context.createParsingComponents();

        switch (lowerText) {
            case "maintenant":
                return references.now(context.reference);

            case "aujourd'hui":
                return references.today(context.reference);

            case "hier":
                return references.yesterday(context.reference);

            case "demain":
                return references.tomorrow(context.reference);

            default:
                if (lowerText.match(/cette\s*nuit/)) {
                    assignSimilarDate(component, targetDate);
                    component.imply("hour", 22);
                    component.imply("meridiem", Meridiem.PM);
                } else if (lowerText.match(/la\s*veille/)) {
                    const previousDay = new Date(targetDate.getTime());
                    previousDay.setDate(previousDay.getDate() - 1);
                    assignSimilarDate(component, previousDay);
                    component.imply("hour", 0);
                }
        }

        return component;
    }
}