/*
 * RecoReco -- keep the "days before" field within one period of the selected frequency.
 *
 * The Recurring schedule modal is injected by AJAX, so we react to the frequency <select> both when
 * it appears (MutationObserver) and when it changes (delegated event). Daily -> field disabled (0);
 * weekly -> max 6; monthly -> max 27; yearly -> max 364. The server clamps too, so this is only the
 * UI guard.
 */
(function () {
    "use strict";

    var CAPS = { daily: 0, weekly: 6, monthly_day: 27, monthly_dow: 27, yearly: 364 };

    function apply(select) {
        // "days before" ceiling / disable by frequency.
        var input = document.querySelector('input[name="recoreco_days_before"]');
        if (input) {
            var max = CAPS.hasOwnProperty(select.value) ? CAPS[select.value] : 27;

            if (max === 0) {
                input.value = 0;
                input.setAttribute("max", "0");
                input.disabled = true;
            } else {
                input.disabled = false;
                input.setAttribute("max", String(max));
                if (parseInt(input.value, 10) > max) {
                    input.value = max;
                }
            }
        }

        // The last-day/weekday checkbox only means something for monthly and yearly.
        var lastday = document.querySelector(".recoreco-lastday");
        if (lastday) {
            var monthlyOrYearly = select.value === "monthly_day" || select.value === "monthly_dow" || select.value === "yearly";
            lastday.style.display = monthlyOrYearly ? "" : "none";
        }
    }

    // "Follow FinanceBuddy installments": when on, the current/limit fields mirror FinanceBuddy's
    // live installment current/total and are disabled (so they do not post, keeping FinanceBuddy the
    // single source of truth); when off, they restore RecoReco's own stored values.
    function applyFollow(checkbox) {
        var group = checkbox.closest(".recoreco-limit-group");
        if (!group) { return; }

        var count = group.querySelector('input[name="recoreco_count"]');
        var limit = group.querySelector('input[name="recoreco_limit"]');
        if (!count || !limit) { return; }

        if (checkbox.checked) {
            count.value = group.getAttribute("data-fb-current");
            limit.value = group.getAttribute("data-fb-total");
        } else {
            count.value = group.getAttribute("data-rr-count");
            limit.value = group.getAttribute("data-rr-limit");
        }

        count.disabled = checkbox.checked;
        limit.disabled = checkbox.checked;
    }

    // Trigger column: it can never be the target, so hide+disable that option and reset to Any if it
    // was selected; the invert checkbox only means something for a specific column.
    function applyTrigger() {
        var target = document.querySelector('select[name="recoreco_target_column"]');
        var trigger = document.querySelector('select[name="recoreco_trigger_column"]');
        var invert = document.querySelector('input[name="recoreco_trigger_invert"]');
        if (!target || !trigger) { return; }

        for (var i = 0; i < trigger.options.length; i++) {
            var isTarget = trigger.options[i].value === target.value;
            trigger.options[i].hidden = isTarget;
            trigger.options[i].disabled = isTarget;
        }
        if (trigger.value === target.value) { trigger.value = "any"; }

        if (invert) {
            var invertDisabled = (trigger.value === "any");
            invert.disabled = invertDisabled;
            var invertLabel = invert.closest("label");
            if (invertLabel) { invertLabel.style.opacity = invertDisabled ? "0.5" : ""; }
        }
    }

    // Move-mode makes copies moot, so grey out "Link copies to the template" while it is checked
    // (disabled -> it won't post, so the saved value is 0).
    function applyMove() {
        var move = document.querySelector('input[name="recoreco_move"]');
        var link = document.querySelector('input[name="recoreco_link_copies"]');
        if (!move || !link) { return; }

        link.disabled = move.checked;
        var label = link.closest("label");
        if (label) { label.style.opacity = move.checked ? "0.5" : ""; }
    }

    // Italicize the card's current column in the target/trigger dropdowns, so you can see where it
    // sits right now. (<option> styling is honored by Chrome/Firefox; Safari may ignore it.)
    function applyCurrentItalic() {
        var form = document.querySelector('form[data-recoreco-current]');
        if (!form) { return; }

        var current = form.getAttribute("data-recoreco-current");
        var selects = form.querySelectorAll('select[name="recoreco_target_column"], select[name="recoreco_trigger_column"]');
        for (var s = 0; s < selects.length; s++) {
            for (var i = 0; i < selects[s].options.length; i++) {
                if (selects[s].options[i].value === current) {
                    selects[s].options[i].style.fontStyle = "italic";
                }
            }
        }
    }

    document.addEventListener("change", function (e) {
        if (e.target && e.target.name === "recoreco_frequency") {
            apply(e.target);
        }
        if (e.target && e.target.name === "recoreco_follow_finance") {
            applyFollow(e.target);
        }
        if (e.target && (e.target.name === "recoreco_target_column" || e.target.name === "recoreco_trigger_column")) {
            applyTrigger();
        }
        if (e.target && e.target.name === "recoreco_move") {
            applyMove();
        }
    });

    if (window.MutationObserver) {
        new MutationObserver(function () {
            var select = document.querySelector('select[name="recoreco_frequency"]:not([data-recoreco-init])');
            if (select) {
                select.setAttribute("data-recoreco-init", "1");
                apply(select);
                applyTrigger();
                applyMove();
                applyCurrentItalic();
            }
        }).observe(document.body, { childList: true, subtree: true });
    }
})();