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);
}

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);
}

/* ---------- Индивидуальные задания (защита) ---------- */

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

function showDefenseText(btn) {
    var el = $id('defense-text-body');
    if (el) el.textContent = btn.getAttribute('data-md') || '(пусто)';
    var title = $id('defense-text-title');
    if (title) title.textContent = (btn.getAttribute('data-student-name') || '') + ' — ' + (btn.getAttribute('data-lab-name') || '');
    var d = $id('modal-defense-text');
    if (d && d.showModal) d.showModal();
}

function filterDefense() {
    var s = $id('defense-lab-filter');
    if (!s) return;
    var labId = s.value;
    document.querySelectorAll('#defense-table tr[data-lab]').forEach(function (tr) {
        tr.style.display = (!labId || tr.getAttribute('data-lab') === labId) ? '' : 'none';
    });
}

/* ---------- Матрица: фокус на лабораторной и закрепление варианта ---------- */

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]').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 () { filterDefense(); focusLab(); });