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

const PATTERN = /(ora|oggi|stasera|questa sera|domani|dmn|ieri\s*sera)(?=\W|$)/i;

export default class ITCasualDateParser extends AbstractParserWithWordBoundaryChecking {
    innerPattern(context: ParsingContext): RegExp {
        return PATTERN;
    }

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

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

            case "oggi":
                return references.today(context.reference);

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

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

            case "stasera":
            case "questa sera":
                return references.tonight(context.reference);

            default:
                if (lowerText.match(/ieri\s*sera/)) {
                    if (targetDate.getHours() > 6) {
                        const previousDay = new Date(targetDate.getTime());
                        previousDay.setDate(previousDay.getDate() - 1);
                        targetDate = previousDay;
                    }

                    assignSimilarDate(component, targetDate);
                    component.imply("hour", 0);
                }

                break;
        }

        return component;
    }
}