/*
 * OrganonTweaks -- enhance Kanboard's native "Edit recurrence" dialog.
 *
 * That template (task_recurrence/edit.php) has no hook, so we transform the form in JS when
 * the modal opens:
 *   1. Replace the "Generate recurrent task" Yes/No dropdown with two radio buttons (one
 *      click instead of open + select). The original <select> is kept, hidden, and stays in
 *      sync, so the form still submits recurrence_status normally.
 *   2. Add a small [+7] button next to the "Factor" input that adds 7 (a week of days).
 *
 * Detection: the modal is injected into #modal-box dynamically, so we watch the document for
 * an un-enhanced recurrence form appearing. Loaded only when the setting is enabled.
 */
(function () {
    "use strict";

    function enhanceStatus(select) {
        var group = document.createElement("span");
        group.className = "ot-recurrence-status";

        var radios = [];

        for (var i = 0; i < select.options.length; i++) {
            var opt = select.options[i];

            var label = document.createElement("label");
            // Kanboard styles form labels as display:block; force inline so Yes/No sit
            // side by side instead of stacked.
            label.style.display = "inline-block";
            label.style.marginRight = "14px";
            label.style.cursor = "pointer";

            var radio = document.createElement("input");
            radio.type = "radio";
            // No name attribute on purpose: a named radio would be SUBMITTED with the form,
            // and Kanboard rejects the extra key ("invalid identifier"). These are display
            // only -- the hidden <select> carries the value -- so we enforce the mutual
            // exclusivity ourselves.
            radio.value = opt.value;
            radio.checked = opt.value === select.value;
            radio.style.marginRight = "4px";
            radios.push(radio);

            radio.addEventListener("change", function () {
                for (var k = 0; k < radios.length; k++) {
                    radios[k].checked = (radios[k] === this);
                }
                select.value = this.value;
                select.dispatchEvent(new Event("change", { bubbles: true }));
            });

            label.appendChild(radio);
            label.appendChild(document.createTextNode(opt.text));
            group.appendChild(label);
        }

        select.style.display = "none";
        select.parentNode.insertBefore(group, select.nextSibling);
    }

    function enhanceFactor(input) {
        var btn = document.createElement("button");
        btn.type = "button";
        btn.className = "btn";
        btn.textContent = "+7";
        btn.title = "Add 7 (one week of days)";
        btn.style.marginLeft = "6px";
        btn.addEventListener("click", function () {
            input.value = (parseInt(input.value, 10) || 0) + 7;
            input.dispatchEvent(new Event("change", { bubbles: true }));
        });

        input.parentNode.insertBefore(btn, input.nextSibling);
    }

    function enhance() {
        var select = document.querySelector('select[name="recurrence_status"]:not([data-ot-recurrence])');
        if (!select) {
            return;
        }

        select.setAttribute("data-ot-recurrence", "1");
        enhanceStatus(select);

        var factor = document.querySelector('input[name="recurrence_factor"]:not([data-ot-recurrence])');
        if (factor) {
            factor.setAttribute("data-ot-recurrence", "1");
            enhanceFactor(factor);
        }
    }

    function init() {
        enhance();

        if (window.MutationObserver) {
            new MutationObserver(enhance).observe(document.body, { childList: true, subtree: true });
        }
    }

    if (document.readyState === "loading") {
        document.addEventListener("DOMContentLoaded", init);
    } else {
        init();
    }
})();