const { DateTime } = require("luxon");

function hasExplicitTime(rawDate) {
    if (!rawDate) return false;
    const cleaned = rawDate.replace(/^['"]|['"]$/g, "");
    return /\d{2}:\d{2}/.test(cleaned);
}

function resolveArticleDate(dateValue, rawDate, { timezone = "Europe/Paris", defaultHour = 12, defaultMinute = 0 } = {}) {
    const hasTime = hasExplicitTime(rawDate);
    const zone = timezone || "UTC";

    let parsed;

    if (typeof dateValue === "string") {
        parsed = DateTime.fromISO(dateValue, { zone });

        if (!parsed.isValid) {
            parsed = DateTime.fromRFC2822(dateValue, { zone });
        }
    } else if (dateValue instanceof Date) {
        parsed = DateTime.fromJSDate(dateValue, { zone });
    }

    if (!parsed || !parsed.isValid) return null;

    if (!hasTime) {
        parsed = parsed.set({ hour: defaultHour, minute: defaultMinute, second: 0, millisecond: 0 });
    }

    return parsed;
}

function buildTimeWindow(target, windowMinutes = 60) {
    const minutes = Number.isFinite(windowMinutes) ? windowMinutes : 60;
    return {
        start: target.minus({ minutes }),
        end: target.plus({ minutes }),
    };
}

module.exports = {
    buildTimeWindow,
    hasExplicitTime,
    resolveArticleDate,
};