// ==UserScript==
// @name        MusicBrainz: Paste-A-Date! (2025 update, month names fixed)
// @description Paste a full or partial date directly into any year field on MusicBrainz (release + relationship editors)
// @version     2025-10-25
// @author      - based off https://gist.github.com/JesseWeinstein/368bddf748f4faf44b5775addf7f3db0
// @namespace   https://musicbrainz.org/
// @match       *://musicbrainz.org/*
// @match       *://beta.musicbrainz.org/*
// @grant       none
// ==/UserScript==

(function () {
    'use strict';

    // ---------------------------
    //  Date parsing helpers
    // ---------------------------

    const MONTHS = {
        jan: "01", january: "01",
        feb: "02", february: "02",
        mar: "03", march: "03",
        apr: "04", april: "04",
        may: "05",
        jun: "06", june: "06",
        jul: "07", july: "07",
        aug: "08", august: "08",
        sep: "09", september: "09",
        oct: "10", october: "10",
        nov: "11", november: "11",
        dec: "12", december: "12"
    };

    function clean_date(y, m, d) {
        if (!y) return null;
        if (y.length === 2) y = (y > 20 ? "19" : "20") + y;
        if (m && m.length === 1) m = "0" + m;
        if (d && d.length === 1) d = "0" + d;
        return [y, m, d].filter(Boolean).join("-");
    }

    function parseDateString(str) {
        if (!str) return null;
        str = str.trim().toLowerCase();

        // Check for month names: e.g., "feb 25 2025" or "25 feb 2025"
        const monthNameRegex1 = /^([a-z]+)\s+(\d{1,2})(?:,\s*|\s+)(\d{2,4})$/; // Feb 25 2025
        const monthNameRegex2 = /^(\d{1,2})\s+([a-z]+)(?:,\s*|\s+)(\d{2,4})$/; // 25 Feb 2025
        let m;
        if ((m = monthNameRegex1.exec(str))) return clean_date(m[3], MONTHS[m[1]], m[2]);
        if ((m = monthNameRegex2.exec(str))) return clean_date(m[3], MONTHS[m[2]], m[1]);

        // Simple numeric formats
        const ymd = /^\W*([0-9]{2,4})(?:\W+([0-9]{1,2})(?:\W+([0-9]{1,2}))?)?\W*$/;
        const dmy = /^\W*(?:(0?[1-9]|[12][0-9]|3[01])\W+)?(0?[1-9]|1[0-2])\W+([0-9]{2,4})\W*$/;

        if ((m = ymd.exec(str))) return clean_date(m[1], m[2], m[3]);
        if ((m = dmy.exec(str))) return clean_date(m[3], m[2], m[1]);
        return null;
    }

    // ---------------------------
    //  React-safe input helpers
    // ---------------------------

    function triggerReactInput(el, newValue) {
        const prototype = Object.getPrototypeOf(el);
        const descriptor = Object.getOwnPropertyDescriptor(prototype, 'value');
        descriptor.set.call(el, newValue);
        el.dispatchEvent(new Event('input', { bubbles: true }));
        el.dispatchEvent(new Event('change', { bubbles: true }));
    }

    function setDate(baseInput, y, m, d) {
        const container = baseInput.closest('td, div, span');
        if (!container) return;

        const year = container.querySelector('input.partial-date-year');
        const month = container.querySelector('input.partial-date-month');
        const day = container.querySelector('input.partial-date-day');

        requestAnimationFrame(() => {
            if (year) triggerReactInput(year, y || '');
            if (month) triggerReactInput(month, m || '');
            if (day) triggerReactInput(day, d || '');

            setTimeout(() => {
                if (year) triggerReactInput(year, y || '');
                if (month) triggerReactInput(month, m || '');
                if (day) triggerReactInput(day, d || '');
            }, 150);
        });
    }

    // ---------------------------
    //  Paste handler
    // ---------------------------

    function handlePaste(event) {
        const str = (event.clipboardData || window.clipboardData).getData('text');
        const parsed = parseDateString(str);
        if (!parsed) return;

        event.preventDefault();

        const [y, m, d] = parsed.split('-');
        setDate(event.target, y, m, d);

        const mark = document.createElement('span');
        mark.textContent = ' ✓';
        mark.style.color = 'green';
        mark.style.fontWeight = 'bold';
        event.target.insertAdjacentElement('afterend', mark);
        setTimeout(() => mark.remove(), 1000);
    }

    // ---------------------------
    //  Attach logic
    // ---------------------------

    function attachListeners() {
        document.querySelectorAll('input.partial-date-year').forEach(input => {
            if (input._pasteAdateAttached) return;
            input._pasteAdateAttached = true;
            input.addEventListener('paste', handlePaste);
        });
    }

    attachListeners();
    const observer = new MutationObserver(attachListeners);
    observer.observe(document.body, { childList: true, subtree: true });

})();