function $id(id) { return document.getElementById(id); }

/* ---------- Оценка + комментарии ---------- */

function openGradeEditor(btn) {
    var all = [];
    try { all = JSON.parse(btn.getAttribute('data-comments') || '[]'); } catch (e) { all = []; }
    var idx = parseInt(btn.getAttribute('data-ci') || '0', 10);
    var list = Array.isArray(all[idx]) ? all[idx] : [];

    $id('grade-student').value = btn.getAttribute('data-student') || '';
    $id('grade-lab').value = btn.getAttribute('data-lab') || '';
    $id('grade-who').value = btn.getAttribute('data-student-name') || '';
    var title = $id('grade-title');
    if (title) title.textContent = (btn.getAttribute('data-lab-name') || '') + ' — ' + (btn.getAttribute('data-student-name') || '');
    $id('grade-score').value = btn.getAttribute('data-score') || '';

    var box = $id('cs-rows');
    box.innerHTML = '';
    list.forEach(function (c) { csRow(c.text, c.tone); });
    if (!list.length) csRow('', 'neutral');

    var d = $id('modal-grade');
    if (d && d.showModal) d.showModal();
}

function csRow(text, tone) {
    var box = $id('cs-rows');
    var row = document.createElement('div');
    row.className = 'cs-row';

    var inp = document.createElement('input');
    inp.className = 'input cs-text';
    inp.placeholder = 'Комментарий';
    inp.value = text || '';

    var sel = document.createElement('select');
    sel.className = 'input cs-tone';
    [['positive', '＋ позитивный'], ['negative', '— негативный'], ['neutral', '○ нейтральный']].forEach(function (o) {
        var op = document.createElement('option');
        op.value = o[0];
        op.textContent = o[1];
        sel.appendChild(op);
    });
    sel.value = tone || 'neutral';

    var rm = document.createElement('button');
    rm.type = 'button';
    rm.className = 'btn btn-secondary btn-sm';
    rm.textContent = 'удалить';
    rm.onclick = function () { row.remove(); };

    row.appendChild(inp);
    row.appendChild(sel);
    row.appendChild(rm);
    box.appendChild(row);

    attachCommentAutocomplete(inp);
}

/* ---------- Автодополнение комментариев ---------- *
 * При фокусе/вводе запрашивает ранее введённые комментарии (подстрока, без регистра),
 * отсортированные по частоте; выбор подставляет текст и «тон». */

var AC_TIMER = null;

function attachCommentAutocomplete(input) {
    var list = document.createElement('div');
    list.className = 'ac-list';
    list.hidden = true;
    input.parentNode.appendChild(list);

    var active = -1;

    function hide() {
        list.hidden = true;
        active = -1;
    }

    function render(items) {
        if (document.activeElement !== input) return;
        if (!Array.isArray(items) || !items.length) {
            hide();
            return;
        }
        list.innerHTML = '';
        items.forEach(function (item) {
            var row = document.createElement('div');
            row.className = 'ac-item';
            row.textContent = item.text;
            row.addEventListener('mousedown', function (event) {
                event.preventDefault();
                input.value = item.text;
                var tone = input.parentNode.querySelector('.cs-tone');
                if (tone && item.tone) tone.value = item.tone;
                hide();
            });
            list.appendChild(row);
        });
        list.hidden = false;
        active = -1;
    }

    function load() {
        clearTimeout(AC_TIMER);
        AC_TIMER = setTimeout(function () {
            fetch('/admin/comment-templates?q=' + encodeURIComponent(input.value.trim()))
                .then(function (r) { return r.ok ? r.json() : []; })
                .then(render)
                .catch(hide);
        }, 150);
    }

    input.addEventListener('focus', load);
    input.addEventListener('input', load);
    input.addEventListener('blur', function () { setTimeout(hide, 150); });
    input.addEventListener('keydown', function (event) {
        if (list.hidden) return;
        var items = list.querySelectorAll('.ac-item');
        if (!items.length) return;
        if (event.key === 'ArrowDown' || event.key === 'ArrowUp') {
            event.preventDefault();
            active = (active + (event.key === 'ArrowDown' ? 1 : -1) + items.length) % items.length;
            items.forEach(function (el, i) { el.classList.toggle('active', i === active); });
        } else if (event.key === 'Enter' && active >= 0) {
            event.preventDefault();
            items[active].dispatchEvent(new MouseEvent('mousedown', { bubbles: true }));
        } else if (event.key === 'Escape') {
            hide();
        }
    });
}

function csSerialize() {
    var out = [];
    document.querySelectorAll('#cs-rows .cs-row').forEach(function (r) {
        var t = r.querySelector('.cs-text').value.trim();
        if (t) out.push({ text: t, tone: r.querySelector('.cs-tone').value });
    });
    $id('grade-comments').value = JSON.stringify(out);
}

/* ---------- Индивидуальное задание (защита) ---------- */

/** Открывает диалог задания; кнопка может не нести data-* (тогда это «назначить новое»). */
function openDefense(btn) {
    var form = $id('defense-form');
    if (!form) return;
    form.reset();
    var student = btn.getAttribute('data-student') || '';
    var lab = btn.getAttribute('data-lab') || '';
    if (student) $id('defense-student-select').value = student;
    if (lab) $id('defense-lab-select').value = lab;
    $id('defense-md').value = btn.getAttribute('data-md') || '';

    var session = btn.getAttribute('data-session') || '';
    var status = btn.getAttribute('data-status') || '';
    var actions = $id('defense-actions');
    if (session) {
        $id('defense-issue-form').action = '/admin/defenses/' + session + '/issue-code';
        $id('defense-reset-form').action = '/admin/defenses/' + session + '/reset';
        if ($id('defense-action-lab')) $id('defense-action-lab').value = lab;
        if ($id('defense-reset-lab')) $id('defense-reset-lab').value = lab;
        $id('defense-reset-form').hidden = status !== 'ready';
        if (actions) actions.hidden = false;
    } else if (actions) {
        actions.hidden = true;
    }

    var d = $id('modal-defense');
    if (d && d.showModal) d.showModal();
}

function showDefenseFromModal() {
    var el = $id('defense-text-body');
    if (el) el.textContent = $id('defense-md').value || '(пусто)';
    var title = $id('defense-text-title');
    if (title) {
        var s = $id('defense-student-select');
        var l = $id('defense-lab-select');
        var who = s && s.selectedOptions[0] ? s.selectedOptions[0].textContent : '';
        var lab = l && l.selectedOptions[0] ? l.selectedOptions[0].textContent : '';
        title.textContent = who + ' — ' + lab;
    }
    var d = $id('modal-defense-text');
    if (d && d.showModal) d.showModal();
}

/* ---------- Матрица: фокус на лабораторной ---------- */

function focusLab() {
    var s = $id('lab-focus');
    if (!s) return;
    var labId = s.value;
    document.querySelectorAll('th.lab-col[data-lab], td.cell-lab[data-lab], .filter-row th[data-lab]').forEach(function (el) {
        el.style.display = (!labId || el.getAttribute('data-lab') === labId) ? '' : 'none';
    });
}

document.addEventListener('submit', function (ev) {
    if (ev.target && ev.target.id === 'grade-form') csSerialize();
}, true);

window.addEventListener('DOMContentLoaded', function () { focusLab(); });