/**
 * TPU Survey - Admin Dashboard Logic (Redesigned)
 * Card-based UI, search, filters, charts, animated counters
 */

let currentView = 'dashboard';
let surveysList = [];
let usersList = [];
let currentSurveyFilter = 'all';

// ============================================================
// Initialization
// ============================================================
async function initAdmin() {
    const loggedIn = await Auth.check();
    if (!loggedIn || !Auth.isAdmin()) {
        window.location.href = 'index.html';
        return;
    }

    // Set user info in sidebar
    const name = Auth.user.full_name || 'ผู้ดูแลระบบ';
    document.getElementById('welcomeName').textContent = name;
    document.getElementById('userName').textContent = name;
    document.getElementById('userAvatar').textContent = name.charAt(0).toUpperCase();

    // Set current date
    setWelcomeDate();

    showView('dashboard');
}

function setWelcomeDate() {
    const el = document.getElementById('welcomeDate');
    if (!el) return;
    const now = new Date();
    const options = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' };
    el.textContent = '📅 ' + now.toLocaleDateString('th-TH', options);
}

// ============================================================
// Navigation
// ============================================================
function showView(view) {
    currentView = view;
    document.querySelectorAll('.view-section').forEach(s => s.classList.add('hidden'));
    document.getElementById(`view-${view}`)?.classList.remove('hidden');

    document.querySelectorAll('.nav-item').forEach(n => n.classList.remove('active'));
    document.querySelector(`.nav-item[data-view="${view}"]`)?.classList.add('active');

    const titles = {
        dashboard: 'ภาพรวมระบบ',
        users: 'จัดการผู้ใช้',
        surveys: 'จัดการแบบสอบถาม',
        profile: 'ข้อมูลส่วนตัว'
    };
    document.getElementById('pageTitle').textContent = titles[view] || '';

    if (view === 'dashboard') loadDashboardStats();
    else if (view === 'users') loadUsers();
    else if (view === 'surveys') loadSurveys();
    else if (view === 'profile') loadProfile();
}

// ============================================================
// Animated Counter
// ============================================================
function animateCounter(el, target) {
    const duration = 800;
    const start = parseInt(el.textContent) || 0;
    const diff = target - start;
    if (diff === 0) { el.textContent = target; return; }

    const startTime = performance.now();
    function step(currentTime) {
        const progress = Math.min((currentTime - startTime) / duration, 1);
        const eased = 1 - Math.pow(1 - progress, 3); // ease-out cubic
        el.textContent = Math.round(start + diff * eased);
        if (progress < 1) requestAnimationFrame(step);
    }
    requestAnimationFrame(step);
}

// ============================================================
// Dashboard Stats
// ============================================================
async function loadDashboardStats() {
    try {
        const [usersData, surveysData] = await Promise.all([
            API.get('users.php?action=list'),
            API.get('surveys.php?action=list')
        ]);

        usersList = usersData.users || [];
        surveysList = surveysData.surveys || [];

        const totalUsers = usersList.length;
        const totalSurveys = surveysList.length;
        const activeSurveys = surveysList.filter(s => s.status === 'active').length;
        const draftSurveys = surveysList.filter(s => s.status === 'draft').length;
        const closedSurveys = surveysList.filter(s => s.status === 'closed').length;
        const totalResponses = surveysList.reduce((sum, s) => sum + (parseInt(s.response_count) || 0), 0);

        // Animate stat counters
        animateCounter(document.getElementById('statUsers'), totalUsers);
        animateCounter(document.getElementById('statSurveys'), totalSurveys);
        animateCounter(document.getElementById('statActive'), activeSurveys);
        animateCounter(document.getElementById('statResponses'), totalResponses);

        // Render status chart
        renderStatusChart(activeSurveys, draftSurveys, closedSurveys, totalSurveys);

        // Recent surveys list
        renderRecentSurveys(surveysList.slice(0, 5));
    } catch (err) {
        Toast.error(err.message);
    }
}

function renderStatusChart(active, draft, closed, total) {
    const max = total || 1;
    const activeEl = document.getElementById('chartActive');
    const draftEl = document.getElementById('chartDraft');
    const closedEl = document.getElementById('chartClosed');

    if (activeEl) {
        setTimeout(() => { activeEl.style.width = Math.max((active / max) * 100, active > 0 ? 8 : 0) + '%'; }, 100);
    }
    if (draftEl) {
        setTimeout(() => { draftEl.style.width = Math.max((draft / max) * 100, draft > 0 ? 8 : 0) + '%'; }, 200);
    }
    if (closedEl) {
        setTimeout(() => { closedEl.style.width = Math.max((closed / max) * 100, closed > 0 ? 8 : 0) + '%'; }, 300);
    }

    const activeCount = document.getElementById('chartActiveCount');
    const draftCount = document.getElementById('chartDraftCount');
    const closedCount = document.getElementById('chartClosedCount');
    if (activeCount) activeCount.textContent = `${active} (${total ? Math.round(active / total * 100) : 0}%)`;
    if (draftCount) draftCount.textContent = `${draft} (${total ? Math.round(draft / total * 100) : 0}%)`;
    if (closedCount) closedCount.textContent = `${closed} (${total ? Math.round(closed / total * 100) : 0}%)`;
}

function renderRecentSurveys(surveys) {
    const list = document.getElementById('recentSurveysList');
    if (!list) return;

    if (surveys.length === 0) {
        list.innerHTML = `
            <li class="activity-item" style="justify-content:center;padding:40px;">
                <span class="text-muted">ยังไม่มีแบบสอบถาม</span>
            </li>`;
        return;
    }

    const statusIcons = { active: '🟢', draft: '📝', closed: '🔴' };
    const statusLabels = { active: 'เปิดใช้', draft: 'ร่าง', closed: 'ปิด' };

    list.innerHTML = surveys.map(s => `
        <li class="activity-item">
            <div class="activity-icon">${statusIcons[s.status] || '📄'}</div>
            <div class="activity-text">
                <strong>${escapeHtml(s.title)}</strong>
                <span>สร้างโดย ${escapeHtml(s.creator_name || '-')} · ${statusLabels[s.status] || s.status} · ${s.response_count || 0} คำตอบ</span>
            </div>
        </li>
    `).join('');
}

// ============================================================
// User Management — Card View
// ============================================================
async function loadUsers() {
    try {
        const data = await API.get('users.php?action=list');
        usersList = data.users || [];
        renderUserCards();
    } catch (err) {
        Toast.error(err.message);
    }
}

function renderUserCards(filteredList) {
    const container = document.getElementById('userCardsContainer');
    const summary = document.getElementById('userSummary');
    if (!container) return;

    const users = filteredList || usersList;

    if (users.length === 0) {
        container.innerHTML = `
            <div class="card-tapi p-8 text-center bg-white rounded-xl border border-slate-200">
                <i class="fas fa-users-slash text-4xl text-blue-300 mb-3 block"></i>
                <p class="text-gray-600 font-bold">ไม่พบผู้ใช้ ลองค้นหาด้วยคำอื่น หรือเพิ่มผู้ใช้ใหม่</p>
            </div>`;
        if (summary) summary.textContent = '';
        return;
    }

    const roleMap = {
        admin: { label: '👑 ผู้ดูแลระบบ', bg: 'bg-blue-100 text-blue-800 border-blue-300' },
        teacher: { label: '🎓 อาจารย์ / เจ้าของโครงการ', bg: 'bg-amber-100 text-amber-800 border-amber-300' }
    };

    container.innerHTML = users.map(u => {
        const roleInfo = roleMap[u.role] || { label: u.role, bg: 'bg-slate-100 text-slate-800 border-slate-300' };
        const isCurrentUser = u.id == Auth.user.id;

        return `
            <div class="card-tapi p-3.5 rounded-xl bg-white flex flex-col sm:flex-row justify-between items-start sm:items-center gap-3 transition-all hover:shadow-md border border-slate-200">
                <div class="flex items-center gap-3 flex-1 min-w-0">
                    <div class="w-10 h-10 rounded-full flex items-center justify-center font-bold text-sm text-white flex-shrink-0 ${u.role === 'admin' ? 'bg-blue-700' : 'bg-amber-500'}">
                        ${(u.full_name || 'U').charAt(0).toUpperCase()}
                    </div>
                    <div class="space-y-0.5 flex-1 min-w-0">
                        <div class="flex items-center gap-2 flex-wrap">
                            <span class="px-2 py-0.5 text-[11px] font-extrabold rounded border whitespace-nowrap ${roleInfo.bg}">${roleInfo.label}</span>
                            <h4 class="font-bold text-xs sm:text-sm text-blue-950 truncate">${escapeHtml(u.full_name)}</h4>
                        </div>
                        <div class="flex items-center gap-3 text-[11px] text-gray-500 font-semibold flex-wrap">
                            <span><i class="fas fa-id-card text-slate-500 mr-1"></i> รหัส: ${escapeHtml(u.personnel_code || u.username || '-')}</span>
                            ${u.email ? `<span><i class="fas fa-envelope text-blue-600 mr-1"></i> ${escapeHtml(u.email)}</span>` : ''}
                            ${u.subject_area ? `<span><i class="fas fa-graduation-cap text-amber-600 mr-1"></i> ${escapeHtml(u.subject_area)}</span>` : ''}
                        </div>
                    </div>
                </div>
                <div class="flex items-center gap-1.5 flex-shrink-0 self-end sm:self-auto">
                    <button onclick="editUser(${u.id})" class="bg-amber-400 hover:bg-amber-500 text-gray-900 border border-slate-800 px-3 py-1 rounded text-xs font-bold flex items-center gap-1 shadow-sm transition-all whitespace-nowrap active:scale-95" title="แก้ไขข้อมูลผู้ใช้">
                        ✏️ แก้ไข
                    </button>
                    ${!isCurrentUser ? `
                    <button onclick="deleteUser(${u.id}, '${escapeHtml(u.full_name)}')" class="bg-rose-600 hover:bg-rose-700 text-white border border-slate-800 px-3 py-1 rounded text-xs font-bold flex items-center gap-1 shadow-sm transition-all whitespace-nowrap active:scale-95" title="ลบผู้ใช้">
                        🗑️ ลบ
                    </button>
                    ` : '<span class="text-xs text-slate-400 font-semibold px-2 py-1 bg-slate-100 rounded">บัญชีคุณ</span>'}
                </div>
            </div>
        `;
    }).join('');

    // Summary
    const admins = users.filter(u => u.role === 'admin').length;
    const teachers = users.filter(u => u.role === 'teacher').length;
    if (summary) {
        summary.textContent = `รวม ${users.length} ผู้ใช้ — 👑 ผู้ดูแล ${admins} คน · 🎓 อาจารย์ ${teachers} คน`;
    }
}

function filterUsers() {
    const query = document.getElementById('userSearchInput')?.value?.toLowerCase() || '';
    if (!query) {
        renderUserCards();
        return;
    }
    const filtered = usersList.filter(u =>
        (u.full_name || '').toLowerCase().includes(query) ||
        (u.personnel_code || '').toLowerCase().includes(query) ||
        (u.username || '').toLowerCase().includes(query)
    );
    renderUserCards(filtered);
}

function showAddUserModal() {
    const html = `
        <form id="userForm">
            <div class="form-group">
                <label class="form-label">รหัสบุคลากร *</label>
                <input type="text" class="form-input" name="personnel_code" required placeholder="เช่น 12345">
                <small class="text-muted text-xs mt-8" style="display:block;">ใช้เป็นชื่อผู้ใช้และรหัสผ่านสำหรับเข้าสู่ระบบ</small>
            </div>
            <div class="form-group">
                <label class="form-label">ชื่อ-นามสกุล *</label>
                <input type="text" class="form-input" name="full_name" required placeholder="เช่น นายสมชาย ใจดี">
            </div>
            <div class="form-group">
                <label class="form-label">อีเมล</label>
                <input type="email" class="form-input" name="email" placeholder="เช่น somchai@example.com">
            </div>
            <div class="form-group">
                <label class="form-label">บทบาท</label>
                <select class="form-input" name="role">
                    <option value="teacher">อาจารย์ / เจ้าของโครงการ</option>
                    <option value="admin">ผู้ดูแลระบบ</option>
                </select>
            </div>
        </form>
    `;
    const footer = `
        <button class="btn btn-secondary" onclick="Modal.hide('addUserModal');document.getElementById('addUserModal').remove();">ยกเลิก</button>
        <button class="btn btn-primary" onclick="submitAddUser()">บันทึก</button>
    `;
    Modal.create('เพิ่มผู้ใช้ใหม่', html, footer);
    document.querySelector('.modal-overlay:last-child').id = 'addUserModal';
}

async function submitAddUser() {
    const form = document.getElementById('userForm');
    const fd = new FormData(form);
    const data = Object.fromEntries(fd);

    if (!data.personnel_code || !data.full_name) {
        Toast.warning('กรุณากรอกรหัสบุคลากรและชื่อ-นามสกุล');
        return;
    }

    // ใช้รหัสบุคลากรเป็น username และ password
    data.username = data.personnel_code;
    data.password = data.personnel_code;

    try {
        await API.post('users.php?action=create', data);
        Toast.success('สร้างผู้ใช้สำเร็จ (รหัสผ่าน = รหัสบุคลากร)');
        Modal.hide('addUserModal');
        document.getElementById('addUserModal').remove();
        loadUsers();
    } catch (err) {
        Toast.error(err.message);
    }
}

async function editUser(id) {
    try {
        const data = await API.get(`users.php?action=get&id=${id}`);
        const u = data.user;

        const html = `
            <form id="editUserForm">
                <input type="hidden" name="id" value="${u.id}">
                <div class="form-group">
                    <label class="form-label">ชื่อ-นามสกุล</label>
                    <input type="text" class="form-input" name="full_name" value="${escapeHtml(u.full_name)}">
                </div>
                <div class="form-group">
                    <label class="form-label">อีเมล</label>
                    <input type="email" class="form-input" name="email" value="${escapeHtml(u.email || '')}" placeholder="เช่น somchai@example.com">
                </div>
                <div class="form-group">
                    <label class="form-label">บทบาท</label>
                    <select class="form-input" name="role">
                        <option value="teacher" ${u.role==='teacher'?'selected':''}>อาจารย์</option>
                        <option value="admin" ${u.role==='admin'?'selected':''}>ผู้ดูแลระบบ</option>
                    </select>
                </div>
                <div class="form-group">
                    <label class="form-label">รหัสบุคลากร</label>
                    <input type="text" class="form-input" name="personnel_code" value="${escapeHtml(u.personnel_code || '')}">
                </div>
                <div class="form-group">
                    <label class="form-label">สังกัด/สาขาวิชา</label>
                    <input type="text" class="form-input" name="subject_area" value="${escapeHtml(u.subject_area || '')}">
                </div>
                <div class="form-group">
                    <label class="form-label">รหัสสาขา</label>
                    <input type="text" class="form-input" name="branch_code" value="${escapeHtml(u.branch_code || '')}">
                </div>
                <div class="form-group">
                    <label class="form-label">รหัสผ่านใหม่ (เว้นว่างถ้าไม่เปลี่ยน)</label>
                    <input type="password" class="form-input" name="password" placeholder="ไม่เปลี่ยนรหัสผ่าน">
                </div>
            </form>
        `;
        const footer = `
            <button class="btn btn-secondary" onclick="Modal.hide('editUserModal');document.getElementById('editUserModal').remove();">ยกเลิก</button>
            <button class="btn btn-primary" onclick="submitEditUser()">บันทึก</button>
        `;
        Modal.create('แก้ไขผู้ใช้', html, footer);
        document.querySelector('.modal-overlay:last-child').id = 'editUserModal';
    } catch (err) {
        Toast.error(err.message);
    }
}

async function submitEditUser() {
    const form = document.getElementById('editUserForm');
    const fd = new FormData(form);
    const data = Object.fromEntries(fd);

    try {
        await API.post('users.php?action=update', data);
        Toast.success('อัปเดตผู้ใช้สำเร็จ');
        Modal.hide('editUserModal');
        document.getElementById('editUserModal').remove();
        loadUsers();
    } catch (err) {
        Toast.error(err.message);
    }
}

async function deleteUser(id, name) {
    if (!confirm(`ต้องการลบผู้ใช้ "${name}" ใช่หรือไม่?`)) return;
    try {
        await API.post('users.php?action=delete', { id });
        Toast.success('ลบผู้ใช้สำเร็จ');
        loadUsers();
    } catch (err) {
        Toast.error(err.message);
    }
}

// ============================================================
// Survey Management — Card View with Filter
// ============================================================
async function loadSurveys() {
    try {
        const data = await API.get('surveys.php?action=list');
        surveysList = data.surveys || [];
        updateSurveyFilterCounts();
        renderSurveyCards();
    } catch (err) {
        Toast.error(err.message);
    }
}

function updateSurveyFilterCounts() {
    const all = surveysList.length;
    const active = surveysList.filter(s => s.status === 'active').length;
    const draft = surveysList.filter(s => s.status === 'draft').length;
    const closed = surveysList.filter(s => s.status === 'closed').length;

    const countAll = document.getElementById('countAll');
    const countActive = document.getElementById('countActive');
    const countDraft = document.getElementById('countDraft');
    const countClosed = document.getElementById('countClosed');

    if (countAll) countAll.textContent = all;
    if (countActive) countActive.textContent = active;
    if (countDraft) countDraft.textContent = draft;
    if (countClosed) countClosed.textContent = closed;
}

function getFilteredSurveys() {
    let list = surveysList;
    if (currentSurveyFilter !== 'all') {
        list = list.filter(s => s.status === currentSurveyFilter);
    }
    const query = document.getElementById('surveySearchInput')?.value?.toLowerCase() || '';
    if (query) {
        list = list.filter(s =>
            (s.title || '').toLowerCase().includes(query) ||
            (s.creator_name || '').toLowerCase().includes(query)
        );
    }
    return list;
}

function renderSurveyCards() {
    const container = document.getElementById('surveyCardsContainer');
    const summary = document.getElementById('surveySummary');
    if (!container) return;

    const surveys = getFilteredSurveys();

    if (surveys.length === 0) {
        container.innerHTML = `
            <div class="card-tapi p-8 text-center bg-white rounded-xl border border-slate-200" style="grid-column: 1/-1;">
                <i class="fas fa-clipboard-list text-4xl text-blue-300 mb-3 block"></i>
                <p class="text-gray-600 font-bold">ไม่พบแบบสอบถาม ลองค้นหาด้วยคำอื่น หรือสร้างแบบสอบถามใหม่</p>
            </div>`;
        if (summary) summary.textContent = '';
        return;
    }

    const statusMap = {
        active: { label: 'เปิดใช้งาน', bg: 'bg-emerald-100 text-emerald-800 border-emerald-300' },
        draft: { label: 'ฉบับร่าง', bg: 'bg-amber-100 text-amber-800 border-amber-300' },
        closed: { label: 'ปิดแล้ว', bg: 'bg-rose-100 text-rose-800 border-rose-300' }
    };

    container.innerHTML = surveys.map(s => {
        const st = statusMap[s.status] || { label: s.status || 'เปิดใช้งาน', bg: 'bg-emerald-100 text-emerald-800 border-emerald-300' };

        return `
            <div class="card-tapi p-3.5 rounded-xl bg-white flex flex-col lg:flex-row justify-between items-start lg:items-center gap-3 transition-all hover:shadow-md border border-slate-200">
                <div class="flex flex-col sm:flex-row sm:items-center gap-2.5 flex-1 min-w-0">
                    <span class="px-2 py-0.5 text-[11px] font-extrabold rounded border whitespace-nowrap self-start sm:self-auto ${st.bg}">${st.label}</span>
                    <div class="space-y-0.5 flex-1 min-w-0">
                        <h4 class="font-bold text-xs sm:text-sm text-blue-950 truncate" title="${escapeHtml(s.title)}">
                            ${escapeHtml(s.title)}
                        </h4>
                        <div class="flex items-center gap-3 text-[11px] text-gray-500 font-semibold flex-wrap">
                            <span><i class="fas fa-user text-slate-500 mr-1"></i> ${escapeHtml(s.creator_name || '-')}</span>
                            <span><i class="fas fa-comments text-blue-600 mr-1"></i> ${s.response_count || 0} คำตอบ</span>
                            <span><i class="fas fa-calendar-alt text-amber-600 mr-1"></i> ${formatDate(s.created_at)}</span>
                        </div>
                    </div>
                </div>
                <div class="flex flex-wrap lg:flex-nowrap gap-1 items-center flex-shrink-0 w-full lg:w-auto overflow-x-auto pb-1 lg:pb-0">
                    <select class="bg-slate-50 border border-slate-300 text-slate-800 px-1.5 py-1 rounded text-xs font-bold shadow-sm transition-all focus:outline-none" onchange="changeStatus(${s.id}, this.value)" title="เปลี่ยนสถานะ">
                        <option value="draft" ${s.status==='draft'?'selected':''}>📝 ร่าง</option>
                        <option value="active" ${s.status==='active'?'selected':''}>🟢 เปิดใช้งาน</option>
                        <option value="closed" ${s.status==='closed'?'selected':''}>🔴 ปิดแล้ว</option>
                    </select>
                    <button onclick="editSurvey(${s.id})" class="bg-amber-400 hover:bg-amber-500 text-gray-900 border border-slate-800 px-2 py-1 rounded text-xs font-bold flex items-center gap-1 shadow-sm transition-all whitespace-nowrap active:scale-95" title="แก้ไขแบบสอบถาม">
                        ✏️ แก้ไข
                    </button>
                    <button onclick="duplicateSurvey(${s.id})" class="bg-blue-600 hover:bg-blue-700 text-white border border-slate-800 px-2 py-1 rounded text-xs font-bold flex items-center gap-1 shadow-sm transition-all whitespace-nowrap active:scale-95" title="คัดลอกแบบสอบถาม">
                        📑 คัดลอก
                    </button>
                    <button onclick="generateLink(${s.id})" class="bg-blue-900 hover:bg-blue-950 text-white border border-slate-800 px-2 py-1 rounded text-xs font-bold flex items-center gap-1 shadow-sm transition-all whitespace-nowrap active:scale-95" title="ลิงก์และ QR Code">
                        🔗 ลิงก์
                    </button>
                    <button onclick="showImportResponsesModal(${s.id}, '${escapeHtml(s.title)}')" class="bg-emerald-600 hover:bg-emerald-700 text-white border border-slate-800 px-2 py-1 rounded text-xs font-bold flex items-center gap-1 shadow-sm transition-all whitespace-nowrap active:scale-95" title="นำเข้าคำตอบจาก CSV">
                        📥 นำเข้าคำตอบ
                    </button>
                    <button onclick="viewStats(${s.id})" class="bg-indigo-600 hover:bg-indigo-700 text-white border border-slate-800 px-2 py-1 rounded text-xs font-bold flex items-center gap-1 shadow-sm transition-all whitespace-nowrap active:scale-95" title="ผลสถิติ">
                        📊 สถิติ
                    </button>
                    <button onclick="deleteSurvey(${s.id}, '${escapeHtml(s.title)}')" class="bg-rose-600 hover:bg-rose-700 text-white border border-slate-800 px-2 py-1 rounded text-xs font-bold flex items-center gap-1 shadow-sm transition-all whitespace-nowrap active:scale-95" title="ลบแบบสอบถาม">
                        🗑️ ลบ
                    </button>
                </div>
            </div>
        `;
    }).join('');

    if (summary) {
        summary.textContent = `แสดง ${surveys.length} จาก ${surveysList.length} แบบสอบถาม`;
    }
}

function filterSurveys(filter, btn) {
    currentSurveyFilter = filter;
    document.querySelectorAll('#surveyFilterTabs .filter-tab').forEach(t => t.classList.remove('active'));
    if (btn) btn.classList.add('active');
    renderSurveyCards();
}

function filterSurveysBySearch() {
    renderSurveyCards();
}

function showCreateSurveyModal() {
    const html = `
        <form id="surveyForm">
            <div class="form-group">
                <label class="form-label">ชื่อแบบสอบถาม *</label>
                <input type="text" class="form-input" name="title" required placeholder="เช่น แบบประเมินความพึงพอใจโครงการ...">
            </div>
            <div class="form-group">
                <label class="form-label">รายละเอียด</label>
                <textarea class="form-input" name="description" placeholder="คำอธิบายเพิ่มเติม (ไม่จำเป็น)"></textarea>
            </div>
            <hr style="border-color:var(--border-color);margin:20px 0;">
            <p class="text-sm text-muted mb-16">ระบบจะสร้างแบบสอบถามพร้อม 3 ส่วนเริ่มต้น คุณสามารถแก้ไขคำถามได้ภายหลัง</p>
        </form>
    `;
    const footer = `
        <button class="btn btn-secondary" onclick="Modal.hide('createSurveyModal');document.getElementById('createSurveyModal').remove();">ยกเลิก</button>
        <button class="btn btn-primary" onclick="submitCreateSurvey()">สร้างแบบสอบถาม (ใช้ 3 ส่วนมาตรฐาน)</button>
    `;
    Modal.create('สร้างแบบสอบถามใหม่', html, footer);
    document.querySelector('.modal-overlay:last-child').id = 'createSurveyModal';
}

async function submitCreateSurvey() {
    const form = document.getElementById('surveyForm');
    const fd = new FormData(form);
    const data = Object.fromEntries(fd);

    if (!data.title) { Toast.warning('กรุณากรอกชื่อแบบสอบถาม'); return; }

    // Pre-fill 3 sections structure
    data.sections = [
        {
            section_number: 1,
            title: 'ส่วนที่ ข้อมูลทั่วไป',
            category: 'general',
            questions: [
                { question_text: 'เพศ', question_type: 'radio', options: ['ชาย', 'หญิง'], is_required: 1 },
                { question_text: 'ช่วงอายุ', question_type: 'dropdown', options: ['18-25 ปี', '26-35 ปี', '36-45 ปี', '46-55 ปี', '56 ปีขึ้นไป'], is_required: 1 }
            ]
        },
        {
            section_number: 2,
            title: 'ส่วนที่ การประเมินความพึงพอใจ',
            category: 'rating',
            questions: [
                { question_text: 'ด้านเนื้อหาของการจัดโครงการ', question_type: 'radio', is_required: 1 },
                { question_text: 'ด้านวิทยากร / ผู้บรรยาย', question_type: 'radio', is_required: 1 }
            ]
        },
        {
            section_number: 3,
            title: 'ส่วนที่ ข้อเสนอแนะอื่นๆ',
            category: 'suggestions',
            questions: [
                { question_text: 'ข้อเสนอแนะเพิ่มเติม', question_type: 'text', is_required: 0 }
            ]
        }
    ];

    try {
        const result = await API.post('surveys.php?action=create', data);
        Toast.success('สร้างแบบสอบถามสำเร็จ');
        Modal.hide('createSurveyModal');
        document.getElementById('createSurveyModal').remove();
        loadSurveys();
        setTimeout(() => editSurvey(result.id), 500);
    } catch (err) {
        Toast.error(err.message);
    }
}

function editSurvey(id) {
    window.open(`edit.html?id=${id}`, '_blank');
}

function buildQuestionEditor(si, qi, q = {}) {
    const qType = q.question_type || 'radio';
    const qText = q.question_text || '';
    const qOptions = Array.isArray(q.options) ? q.options.join('\n') : '';
    const showOptions = ['radio', 'checkbox', 'dropdown'].includes(qType);

    const qDescription = q.description || '';

    return `
        <div class="question-builder">
            <div class="qb-header">
                <span class="qb-handle">⋮⋮</span>
                <span class="text-sm fw-600 q-number-label">คำถาม</span>
                <div class="qb-actions">
                    <button type="button" class="btn btn-ghost btn-sm" onclick="addQuestion(${si}, this.closest('.question-builder'))" title="แทรกคำถามใต้ข้อนี้">➕ แทรก</button>
                    <button type="button" class="btn btn-ghost btn-sm text-danger" onclick="removeQuestion(this, ${si})" title="ลบคำถาม">🗑️ ลบ</button>
                </div>
            </div>
            <div class="form-group">
                <label class="form-label">คำถาม / ข้อความ</label>
                <input type="text" class="form-input q-text-input" value="${escapeHtml(qText)}" placeholder="พิมพ์คำถาม...">
            </div>
            <div class="form-group">
                <label class="form-label">รายละเอียดเพิ่มเติม (คำใบ้/คำอธิบาย - ไม่บังคับ)</label>
                <input type="text" class="form-input q-desc-input" value="${escapeHtml(qDescription)}" placeholder="เช่น กรุณาระบุเป็นภาษาไทย">
            </div>
            <div class="form-group">
                <label class="form-label">ประเภทคำถาม</label>
                <select class="form-input q-type-select" onchange="toggleOptions(this)">
                    <option value="radio" ${qType==='radio'?'selected':''}>📊 ระดับ 1-5 (Radio)</option>
                    <option value="text" ${qType==='text'?'selected':''}>📝 ข้อความ (Text)</option>
                    <option value="dropdown" ${qType==='dropdown'?'selected':''}>📋 ตัวเลือก (Dropdown)</option>
                    <option value="checkbox" ${qType==='checkbox'?'selected':''}>☑️ หลายตัวเลือก (Checkbox)</option>
                </select>
            </div>
            <div class="form-group q-options-group" style="${showOptions ? '' : 'display:none;'}">
                <label class="form-label">ตัวเลือก (1 รายการต่อบรรทัด)</label>
                <textarea class="form-input q-options-input" placeholder="ตัวเลือกที่ 1\nตัวเลือกที่ 2" rows="3">${escapeHtml(qOptions)}</textarea>
                <small class="text-muted">เว้นว่างไว้หากต้องการใช้ระดับ 1-5 (สำหรับ Radio)</small>
            </div>
        </div>
    `;
}

function addSection() {
    const container = document.getElementById('additionalSections');
    if (!container) return;
    const si = document.querySelectorAll('.card[data-section]').length;

    const html = `
        <div class="card mb-24" data-section="${si}">
            <div class="card-header d-flex justify-between items-center">
                <input type="text" class="form-input" style="font-weight:700;font-size:16px;border:none;padding:4px 0;background:transparent;" 
                       value="ส่วนที่ ข้อมูลเพิ่มเติม" data-field="section-title-${si}">
                <button type="button" class="btn btn-ghost btn-sm text-danger" onclick="this.closest('.card').remove()">🗑️ ลบส่วนนี้</button>
            </div>
            <div class="card-body">
                <div id="questions-${si}"></div>
                <button type="button" class="btn btn-secondary btn-sm mt-16" onclick="addQuestion(${si})">+ เพิ่มคำถาม</button>
            </div>
        </div>
    `;
    container.insertAdjacentHTML('beforeend', html);
    addQuestion(si);
}

function toggleOptions(select) {
    const group = select.closest('.question-builder').querySelector('.q-options-group');
    if (['radio', 'checkbox', 'dropdown'].includes(select.value)) {
        group.style.display = 'block';
    } else {
        group.style.display = 'none';
    }
}

function addQuestion(sectionIdx, afterEl = null) {
    const container = document.getElementById(`questions-${sectionIdx}`);
    if (!container) return;

    const tempDiv = document.createElement('div');
    tempDiv.innerHTML = buildQuestionEditor(sectionIdx, 0);
    const newQ = tempDiv.firstElementChild;

    if (afterEl) {
        afterEl.after(newQ);
    } else {
        container.appendChild(newQ);
    }

    reindexQuestions(sectionIdx);
}

function removeQuestion(btn, sectionIdx) {
    if (!confirm('ยืนยันลบคำถามนี้?')) return;
    btn.closest('.question-builder').remove();
    reindexQuestions(sectionIdx);
}

function reindexQuestions(sectionIdx) {
    const container = document.getElementById(`questions-${sectionIdx}`);
    if (!container) return;
    container.querySelectorAll('.question-builder').forEach((qEl, idx) => {
        const label = qEl.querySelector('.q-number-label');
        if (label) label.textContent = `คำถาม`;
    });
}

async function submitEditSurvey() {
    const form = document.getElementById('editSurveyForm');
    const id = form.querySelector('[name="id"]').value;
    const title = form.querySelector('[name="title"]').value;
    const description = form.querySelector('[name="description"]').value;

    const sections = [];
    form.querySelectorAll('.card[data-section]').forEach((sectionEl, si) => {
        const sTitle = sectionEl.querySelector(`[data-field="section-title-${si}"]`)?.value || `ส่วนที่ ${si+1}`;
        const sCategory = sectionEl.querySelector(`[data-field="section-category-${si}"]`)?.value || `rating`;
        const questions = [];

        sectionEl.querySelectorAll('.question-builder').forEach((qEl, qi) => {
            const qTextInput = qEl.querySelector('.q-text-input');
            const qDescInput = qEl.querySelector('.q-desc-input');
            const qTypeSelect = qEl.querySelector('.q-type-select');
            const qOptionsArea = qEl.querySelector('.q-options-input');

            const qText = qTextInput ? qTextInput.value : '';
            const qDescription = qDescInput ? qDescInput.value : '';
            const qType = qTypeSelect ? qTypeSelect.value : 'radio';
            const qOptionsRaw = qOptionsArea ? qOptionsArea.value : '';

            const options = qOptionsRaw.split('\n').map(o => o.trim()).filter(o => o !== '');

            if (qText.trim()) {
                questions.push({
                    question_text: qText.trim(),
                    description: qDescription.trim() || null,
                    question_type: qType,
                    order_num: qi,
                    is_required: 1,
                    options: options.length > 0 ? options : null
                });
            }
        });

        sections.push({
            section_number: si + 1,
            title: sTitle,
            category: sCategory,
            questions
        });
    });

    try {
        await API.post('surveys.php?action=update', { id: parseInt(id), title, description, sections });
        Toast.success('บันทึกแบบสอบถามสำเร็จ');
        Modal.hide('editSurveyModal');
        document.getElementById('editSurveyModal').remove();
        loadSurveys();
    } catch (err) {
        Toast.error(err.message);
    }
}

async function duplicateSurvey(id) {
    if (!confirm('ยืนยันสร้างสำเนาแบบสอบถามนี้?')) return;
    try {
        await API.post('surveys.php?action=duplicate', { id });
        Toast.success('คัดลอกสำเร็จ');
        loadSurveys();
    } catch (err) {
        Toast.error(err.message);
    }
}

async function changeStatus(id, status) {
    try {
        await API.post('surveys.php?action=updateStatus', { id, status });
        Toast.success('อัปเดตสถานะสำเร็จ');
        // Refresh the card view
        const survey = surveysList.find(s => s.id == id);
        if (survey) survey.status = status;
        updateSurveyFilterCounts();
        renderSurveyCards();
    } catch (err) {
        Toast.error(err.message);
        loadSurveys();
    }
}

async function generateLink(id) {
    try {
        const data = await API.post('surveys.php?action=generateLink', { id });
        const basePath = window.location.pathname.includes('/survey') ? '/survey' : '';
        const fullUrl = data.full_url || `${window.location.origin}${basePath}/respond.php?link=${data.unique_link}`;

        // Find survey title
        const survey = surveysList.find(s => s.id == id);
        const surveyTitle = survey ? survey.title : 'แบบสอบถาม';

        const html = `
            <div class="qr-link-container">
                <div class="qr-link-section">
                    <div class="qr-link-label">🔗 ลิงก์แบบสอบถาม</div>
                    <div class="link-display">
                        <span class="flex-1" id="surveyLinkText">${fullUrl}</span>
                        <button class="copy-btn" onclick="copyLink()">📋 คัดลอก</button>
                    </div>
                </div>
                <div class="qr-code-section">
                    <div class="qr-link-label">📱 QR Code สำหรับตอบแบบสอบถาม</div>
                    <div class="qr-code-wrapper" id="qrCodeWrapper">
                        <div id="qrCodeContainer"></div>
                    </div>
                    <p class="qr-survey-title" id="qrSurveyTitle">${escapeHtml(surveyTitle)}</p>
                    <div class="qr-actions">
                        <button class="btn btn-primary btn-sm" onclick="downloadQR()">📥 ดาวน์โหลด QR</button>
                        <button class="btn btn-secondary btn-sm" onclick="printQR()">🖨️ พิมพ์ QR</button>
                    </div>
                </div>
                <p class="mt-16 text-sm text-muted" style="text-align:center;">⚡ แบบสอบถามถูกเปิดใช้งานอัตโนมัติเมื่อสร้างลิงก์</p>
            </div>
        `;
        Modal.create('🔗 ลิงก์และ QR Code', html, '', 'modal-lg');

        // Generate QR Code using QRCodeJS
        setTimeout(() => {
            const container = document.getElementById('qrCodeContainer');
            if (container && typeof QRCode !== 'undefined') {
                new QRCode(container, {
                    text: fullUrl,
                    width: 280,
                    height: 280,
                    colorDark: '#1e3a8a',
                    colorLight: '#ffffff',
                    correctLevel: QRCode.CorrectLevel.H
                });
            }
        }, 100);
    } catch (err) {
        Toast.error(err.message);
    }
}

function copyLink() {
    const text = document.getElementById('surveyLinkText')?.textContent;
    if (text) {
        navigator.clipboard.writeText(text).then(() => {
            Toast.success('คัดลอกลิงก์แล้ว');
        }).catch(() => {
            const ta = document.createElement('textarea');
            ta.value = text;
            document.body.appendChild(ta);
            ta.select();
            document.execCommand('copy');
            ta.remove();
            Toast.success('คัดลอกลิงก์แล้ว');
        });
    }
}

function getQRImage() {
    const container = document.getElementById('qrCodeContainer');
    if (!container) return null;
    // QRCodeJS generates both canvas and img — prefer canvas for export
    return container.querySelector('canvas') || container.querySelector('img');
}

function downloadQR() {
    const qrEl = getQRImage();
    const title = document.getElementById('qrSurveyTitle')?.textContent || 'survey';
    if (!qrEl) return;

    // Get data URL from canvas or img
    let qrDataUrl;
    if (qrEl.tagName === 'CANVAS') {
        qrDataUrl = qrEl.toDataURL('image/png');
    } else {
        qrDataUrl = qrEl.src;
    }

    // Create a new canvas with title and styling
    const exportCanvas = document.createElement('canvas');
    const qrSize = 280;
    const padding = 40;
    const titleHeight = 60;
    const footerHeight = 40;
    exportCanvas.width = qrSize + padding * 2;
    exportCanvas.height = qrSize + padding * 2 + titleHeight + footerHeight;

    const ctx = exportCanvas.getContext('2d');
    ctx.fillStyle = '#ffffff';
    ctx.fillRect(0, 0, exportCanvas.width, exportCanvas.height);

    // Title
    ctx.fillStyle = '#1a1a2e';
    ctx.font = 'bold 16px sans-serif';
    ctx.textAlign = 'center';
    const maxTitleWidth = exportCanvas.width - 40;
    let displayTitle = title;
    if (ctx.measureText(displayTitle).width > maxTitleWidth) {
        while (ctx.measureText(displayTitle + '...').width > maxTitleWidth && displayTitle.length > 0) {
            displayTitle = displayTitle.slice(0, -1);
        }
        displayTitle += '...';
    }
    ctx.fillText(displayTitle, exportCanvas.width / 2, padding + 20);

    // Draw QR
    const img = new Image();
    img.onload = function() {
        ctx.drawImage(img, padding, padding + titleHeight, qrSize, qrSize);

        // Footer text
        ctx.fillStyle = '#6b7280';
        ctx.font = '12px sans-serif';
        ctx.fillText('สแกนเพื่อตอบแบบสอบถาม — TPU Survey', exportCanvas.width / 2, exportCanvas.height - 16);

        // Download
        const link = document.createElement('a');
        const safeName = title.replace(/[^a-zA-Z0-9ก-๙]/g, '_').substring(0, 50);
        link.download = `QR_${safeName}.png`;
        link.href = exportCanvas.toDataURL('image/png');
        link.click();
        Toast.success('ดาวน์โหลด QR Code สำเร็จ');
    };
    img.src = qrDataUrl;
}

function printQR() {
    const qrEl = getQRImage();
    const title = document.getElementById('qrSurveyTitle')?.textContent || 'แบบสอบถาม';
    const linkText = document.getElementById('surveyLinkText')?.textContent || '';
    if (!qrEl) return;

    let qrDataUrl;
    if (qrEl.tagName === 'CANVAS') {
        qrDataUrl = qrEl.toDataURL('image/png');
    } else {
        qrDataUrl = qrEl.src;
    }

    const printWindow = window.open('', '_blank');
    printWindow.document.write(`
        <!DOCTYPE html><html><head><title>พิมพ์ QR Code</title>
        <style>
            body { font-family: 'Sarabun', sans-serif; text-align: center; padding: 40px; }
            h2 { color: #1a1a2e; margin-bottom: 8px; }
            .subtitle { color: #6b7280; font-size: 14px; margin-bottom: 24px; }
            img { border: 2px solid #e5e7eb; border-radius: 12px; padding: 8px; }
            .link { color: #6b7280; font-size: 11px; word-break: break-all; margin-top: 16px; }
            .footer { margin-top: 32px; color: #9ca3af; font-size: 12px; }
        </style></head>
        <body>
            <h2>${title}</h2>
            <p class="subtitle">สแกน QR Code เพื่อตอบแบบสอบถาม</p>
            <img src="${qrDataUrl}" width="300" height="300">
            <p class="link">${linkText}</p>
            <p class="footer">TPU Survey — มหาวิทยาลัยตาปี</p>
            <script>window.onload = function() { window.print(); }<\/script>
        </body></html>
    `);
    printWindow.document.close();
}

async function deleteSurvey(id, title) {
    if (!confirm(`ต้องการลบแบบสอบถาม "${title}" ใช่หรือไม่?\nข้อมูลคำตอบทั้งหมดจะถูกลบด้วย`)) return;
    try {
        await API.post('surveys.php?action=delete', { id });
        Toast.success('ลบแบบสอบถามสำเร็จ');
        loadSurveys();
    } catch (err) {
        Toast.error(err.message);
    }
}

// ============================================================
// Statistics View
// ============================================================
function viewStats(surveyId) {
    window.open(`stats.html?survey_id=${surveyId}`, '_blank');
}

function exportReport(type, surveyId) {
    window.open(`api/export.php?action=${type}&survey_id=${surveyId}`, '_blank');
}

// ============================================================
// Google Forms Import Modals & Functions
// ============================================================
function showImportGoogleFormModal() {
    const html = `
        <div style="margin-bottom:16px;">
            <div style="display:flex;gap:12px;margin-bottom:16px;border-bottom:1px solid #e5e7eb;padding-bottom:10px;">
                <button id="tabUrlBtn" type="button" class="btn btn-sm btn-primary" onclick="switchImportTab('url')">🌐 วาง URL / Link</button>
                <button id="tabJsonBtn" type="button" class="btn btn-sm btn-secondary" onclick="switchImportTab('json')">📄 อัปโหลดไฟล์ JSON</button>
            </div>

            <!-- Tab 1: URL -->
            <div id="importTabUrl">
                <div class="form-group">
                    <label class="form-label">Google Form URL / Link *</label>
                    <input type="url" class="form-input" id="googleFormUrl" placeholder="https://docs.google.com/forms/d/e/1FAIpQLS.../viewform">
                    <small class="text-muted mt-8" style="display:block;">วางลิงก์แบบสอบถาม Google Forms ที่เปิดสาธารณะ (Public)</small>
                </div>
            </div>

            <!-- Tab 2: JSON -->
            <div id="importTabJson" style="display:none;">
                <div class="form-group">
                    <label class="form-label">เลือกไฟล์ JSON โครงสร้างฟอร์ม *</label>
                    <input type="file" class="form-input" id="googleFormJsonFile" accept=".json">
                </div>
                <div class="form-group">
                    <label class="form-label">หรือวางข้อมูล JSON ตรงนี้</label>
                    <textarea class="form-input" id="googleFormJsonText" rows="4" placeholder='{"title": "แบบสอบถาม...", "sections": [...]}'></textarea>
                </div>
            </div>
        </div>
    `;
    const footer = `
        <button class="btn btn-secondary" onclick="Modal.hide('importGFormModal');document.getElementById('importGFormModal')?.remove();">ยกเลิก</button>
        <button class="btn btn-primary" id="btnSubmitImportGForm" onclick="submitImportGoogleForm()">📥 นำเข้าแบบสอบถาม</button>
    `;
    const modalId = Modal.create('📥 นำเข้าแบบสอบถามจาก Google Forms', html, footer);
    const modalEl = document.getElementById(modalId);
    if (modalEl) modalEl.id = 'importGFormModal';
}

function switchImportTab(tab) {
    const urlTab = document.getElementById('importTabUrl');
    const jsonTab = document.getElementById('importTabJson');
    const urlBtn = document.getElementById('tabUrlBtn');
    const jsonBtn = document.getElementById('tabJsonBtn');

    if (tab === 'url') {
        if (urlTab) urlTab.style.display = 'block';
        if (jsonTab) jsonTab.style.display = 'none';
        if (urlBtn) urlBtn.className = 'btn btn-sm btn-primary';
        if (jsonBtn) jsonBtn.className = 'btn btn-sm btn-secondary';
    } else {
        if (urlTab) urlTab.style.display = 'none';
        if (jsonTab) jsonTab.style.display = 'block';
        if (urlBtn) urlBtn.className = 'btn btn-sm btn-secondary';
        if (jsonBtn) jsonBtn.className = 'btn btn-sm btn-primary';
    }
}

async function submitImportGoogleForm() {
    const urlTab = document.getElementById('importTabUrl');
    const btn = document.getElementById('btnSubmitImportGForm');

    if (btn) {
        btn.disabled = true;
        btn.textContent = '⏳ กำลังนำเข้าข้อมูล...';
    }

    try {
        if (urlTab && urlTab.style.display !== 'none') {
            const url = document.getElementById('googleFormUrl')?.value?.trim();
            if (!url) {
                Toast.warning('กรุณาระบุ Google Form URL');
                if (btn) { btn.disabled = false; btn.textContent = '📥 นำเข้าแบบสอบถาม'; }
                return;
            }

            const res = await API.post('import_google_form.php?action=importFromUrl', { url });
            Toast.success(res.message || 'นำเข้าแบบสอบถามสำเร็จ!');
            Modal.hide('importGFormModal');
            document.getElementById('importGFormModal')?.remove();
            if (typeof loadSurveys === 'function') loadSurveys();
            if (typeof loadTeacherSurveys === 'function') loadTeacherSurveys();
        } else {
            const fileInput = document.getElementById('googleFormJsonFile');
            const jsonText = document.getElementById('googleFormJsonText')?.value?.trim();

            let surveyData = null;

            if (fileInput && fileInput.files.length > 0) {
                const text = await fileInput.files[0].text();
                surveyData = JSON.parse(text);
            } else if (jsonText) {
                surveyData = JSON.parse(jsonText);
            }

            if (!surveyData) {
                Toast.warning('กรุณาเลือกไฟล์ JSON หรือระบุข้อความ JSON');
                if (btn) { btn.disabled = false; btn.textContent = '📥 นำเข้าแบบสอบถาม'; }
                return;
            }

            const res = await API.post('import_google_form.php?action=importFromJson', { survey_data: surveyData });
            Toast.success(res.message || 'นำเข้าแบบสอบถามสำเร็จ!');
            Modal.hide('importGFormModal');
            document.getElementById('importGFormModal')?.remove();
            if (typeof loadSurveys === 'function') loadSurveys();
            if (typeof loadTeacherSurveys === 'function') loadTeacherSurveys();
        }
    } catch (err) {
        Toast.error(err.message || 'เกิดข้อผิดพลาดในการนำเข้าแบบสอบถาม');
    } finally {
        if (btn) {
            btn.disabled = false;
            btn.textContent = '📥 นำเข้าแบบสอบถาม';
        }
    }
}

function showImportResponsesModal(surveyId, surveyTitle) {
    const html = `
        <form id="importRespForm">
            <input type="hidden" name="survey_id" value="${surveyId}">
            <div class="form-group">
                <label class="form-label">แบบสอบถาม:</label>
                <div style="font-weight:600;font-size:15px;color:var(--navy-600);">${escapeHtml(surveyTitle)}</div>
            </div>
            <div class="form-group">
                <label class="form-label">เลือกไฟล์ CSV ข้อมูลคำตอบจาก Google Forms *</label>
                <input type="file" class="form-input" name="csv_file" accept=".csv" required>
                <small class="text-muted mt-8" style="display:block;">ไฟล์ .csv ที่ Export มาจาก Google Sheets / Google Forms (แถวแรกเป็นชื่อคำถาม)</small>
            </div>
        </form>
    `;
    const footer = `
        <button class="btn btn-secondary" onclick="Modal.hide('importRespModal');document.getElementById('importRespModal')?.remove();">ยกเลิก</button>
        <button class="btn btn-primary" id="btnSubmitImportResp" onclick="submitImportResponses(${surveyId})">📥 นำเข้าคำตอบลงระบบ</button>
    `;
    const modalId = Modal.create('📥 นำเข้าคำตอบจาก Google Forms (CSV)', html, footer);
    const modalEl = document.getElementById(modalId);
    if (modalEl) modalEl.id = 'importRespModal';
}

async function submitImportResponses(surveyId) {
    const form = document.getElementById('importRespForm');
    const fileInput = form?.querySelector('input[name="csv_file"]');
    if (!fileInput || fileInput.files.length === 0) {
        Toast.warning('กรุณาเลือกไฟล์ CSV คำตอบ');
        return;
    }

    const btn = document.getElementById('btnSubmitImportResp');
    if (btn) {
        btn.disabled = true;
        btn.textContent = '⏳ กำลังนำเข้าคำตอบ...';
    }

    const fd = new FormData(form);

    try {
        const res = await API.upload('import_responses.php', fd);
        Toast.success(res.message || 'นำเข้าคำตอบสำเร็จ!');
        Modal.hide('importRespModal');
        document.getElementById('importRespModal')?.remove();
        if (typeof loadSurveys === 'function') loadSurveys();
        if (typeof loadTeacherSurveys === 'function') loadTeacherSurveys();
    } catch (err) {
        Toast.error(err.message || 'เกิดข้อผิดพลาดในการนำเข้าคำตอบ');
    } finally {
        if (btn) {
            btn.disabled = false;
            btn.textContent = '📥 นำเข้าคำตอบลงระบบ';
        }
    }
}

// ============================================================
// Profile Management — Matching teacher.js
// ============================================================
async function loadProfile() {
    try {
        const data = await API.get('profile.php?action=get');
        const u = data.user;

        // Fill the form
        if (document.getElementById('profileCode')) document.getElementById('profileCode').value = u.personnel_code || u.username || '-';
        if (document.getElementById('profileName')) document.getElementById('profileName').value = u.full_name || '';
        if (document.getElementById('profileEmail')) document.getElementById('profileEmail').value = u.email || '';
        if (document.getElementById('profileSubject')) document.getElementById('profileSubject').value = u.subject_area || '';
        if (document.getElementById('profileBranch')) document.getElementById('profileBranch').value = u.branch_code || '';
        if (document.getElementById('profilePassword')) document.getElementById('profilePassword').value = '';
        if (document.getElementById('profilePasswordConfirm')) document.getElementById('profilePasswordConfirm').value = '';

        // Fill the sidebar card
        if (document.getElementById('profileDisplayName')) document.getElementById('profileDisplayName').textContent = u.full_name || '-';
        if (document.getElementById('profileDisplayRole')) document.getElementById('profileDisplayRole').textContent = u.role === 'admin' ? 'ผู้ดูแลระบบ' : 'อาจารย์ / เจ้าของโครงการ';
        if (document.getElementById('profileAvatar')) document.getElementById('profileAvatar').textContent = (u.full_name || 'A').charAt(0).toUpperCase();
        if (document.getElementById('profilePersonnelCode')) document.getElementById('profilePersonnelCode').textContent = u.personnel_code || u.username || '-';

        const badge = document.getElementById('profileBadge');
        if (badge) {
            badge.textContent = u.role === 'admin' ? '👑 ผู้ดูแลระบบ' : '🎓 อาจารย์';
            badge.className = `user-card-badge ${u.role}`;
        }
    } catch (err) {
        Toast.error(err.message);
    }
}

async function saveProfile() {
    const fullName = document.getElementById('profileName')?.value.trim();
    const email = document.getElementById('profileEmail')?.value.trim();
    const subjectArea = document.getElementById('profileSubject')?.value.trim();
    const branchCode = document.getElementById('profileBranch')?.value.trim();
    const password = document.getElementById('profilePassword')?.value;
    const passwordConfirm = document.getElementById('profilePasswordConfirm')?.value;

    if (!fullName) {
        Toast.warning('กรุณากรอกชื่อ-นามสกุล');
        return;
    }

    if (password && password.length < 4) {
        Toast.warning('รหัสผ่านต้องมีอย่างน้อย 4 ตัวอักษร');
        return;
    }

    if (password && password !== passwordConfirm) {
        Toast.warning('รหัสผ่านไม่ตรงกัน');
        return;
    }

    const payload = {
        full_name: fullName,
        email: email,
        subject_area: subjectArea,
        branch_code: branchCode
    };

    if (password) {
        payload.password = password;
    }

    try {
        await API.post('profile.php?action=update', payload);
        Toast.success('บันทึกข้อมูลส่วนตัวสำเร็จ');

        // Update sidebar display
        const nameEl = document.getElementById('userName');
        const avatarEl = document.getElementById('userAvatar');
        if (nameEl) nameEl.textContent = fullName;
        if (avatarEl) avatarEl.textContent = fullName.charAt(0).toUpperCase();

        // Reload profile card
        loadProfile();
    } catch (err) {
        Toast.error(err.message);
    }
}

// Global Window bindings
window.showImportGoogleFormModal = showImportGoogleFormModal;
window.switchImportTab = switchImportTab;
window.submitImportGoogleForm = submitImportGoogleForm;
window.showImportResponsesModal = showImportResponsesModal;
window.submitImportResponses = submitImportResponses;
window.loadProfile = loadProfile;
window.saveProfile = saveProfile;

// Init
document.addEventListener('DOMContentLoaded', initAdmin);