// ==UserScript==
// @name         MCM AutoFill Listener
// @namespace    http://tampermonkey.net/
// @version      1.2
// @description  Listens for fill commands from the MCM Filler page
// @match        https://mcm.amazon.com/cms/new*
// @grant        none
// @run-at       document-idle
// ==/UserScript==

(function() {
    'use strict';
    var filled = false;
    window.addEventListener('message', function(e) {
        if (!e.data || e.data.type !== 'FAT1_MCM_FILL' || filled) return;
        var vars = e.data.vars;
        var schedule = e.data.schedule;
        var scheduleEnd = e.data.scheduleEnd;
        function tryFill() {
            var count = 0, total = Object.keys(vars).length;
            Object.entries(vars).forEach(function(pair) {
                var name = pair[0], value = pair[1];
                var el = document.querySelector('textarea[name="templateVariables[{{' + name + '}}]"]');
                if (el) {
                    el.value = value;
                    el.dispatchEvent(new Event('input', {bubbles: true}));
                    el.dispatchEvent(new Event('change', {bubbles: true}));
                    count++;
                }
            });
            if (count === 0 && total > 0) { setTimeout(tryFill, 2000); return; }
            filled = true;
            if (schedule) {
                var startEl = document.querySelector('input[name="scheduled_start"]');
                if (startEl) {
                    startEl.value = schedule;
                    startEl.dispatchEvent(new Event('input', {bubbles: true}));
                    startEl.dispatchEvent(new Event('change', {bubbles: true}));
                    startEl.dispatchEvent(new Event('blur', {bubbles: true}));
                }
                var autoCalc = document.querySelector('input[name="auto_calc_scheduled_end"]');
                if (autoCalc && autoCalc.checked) { autoCalc.click(); }
                if (scheduleEnd) {
                    var endEl = document.querySelector('input[name="scheduled_end"]');
                    if (endEl) {
                        endEl.value = scheduleEnd;
                        endEl.dispatchEvent(new Event('input', {bubbles: true}));
                        endEl.dispatchEvent(new Event('change', {bubbles: true}));
                        endEl.dispatchEvent(new Event('blur', {bubbles: true}));
                    }
                }
            }
            document.title = '✅ ' + (vars.switch_hostname || 'MCM') + ' (' + count + '/' + total + ')';
        }
        setTimeout(tryFill, 2000);
    });
})();