// ============================================================
// Display Brightness & Power Control
// ============================================================

let displayBrightnessTimers = {};
const DISPLAY_THROTTLE_MS = 50;

async function loadDisplayMonitors() {
    const token = localStorage.getItem('media_server_token');
    if (!token) return;

    const container = document.getElementById('displayMonitors');
    if (!container) return;

    try {
        const response = await fetch('/api/display/monitors?refresh=true', {
            headers: { 'Authorization': `Bearer ${token}` }
        });

        if (!response.ok) {
            container.innerHTML = `<div class="empty-state-illustration">
                <svg viewBox="0 0 64 64"><rect x="8" y="10" width="48" height="32" rx="3" fill="none" stroke="currentColor" stroke-width="2"/><line x1="32" y1="42" x2="32" y2="50" stroke="currentColor" stroke-width="2"/><line x1="22" y1="50" x2="42" y2="50" stroke="currentColor" stroke-width="2"/></svg>
                <p data-i18n="display.error">Failed to load monitors</p>
            </div>`;
            return;
        }

        const monitors = await response.json();

        if (monitors.length === 0) {
            container.innerHTML = `<div class="empty-state-illustration">
                <svg viewBox="0 0 64 64"><rect x="8" y="10" width="48" height="32" rx="3" fill="none" stroke="currentColor" stroke-width="2"/><line x1="32" y1="42" x2="32" y2="50" stroke="currentColor" stroke-width="2"/><line x1="22" y1="50" x2="42" y2="50" stroke="currentColor" stroke-width="2"/></svg>
                <p data-i18n="display.no_monitors">No monitors detected</p>
            </div>`;
            return;
        }

        container.innerHTML = '';
        monitors.forEach(monitor => {
            const card = document.createElement('div');
            card.className = 'display-monitor-card';
            card.id = `monitor-card-${monitor.id}`;

            const brightnessValue = monitor.brightness !== null ? monitor.brightness : 0;
            const brightnessDisabled = monitor.brightness === null ? 'disabled' : '';

            let powerBtn = '';
            if (monitor.power_supported) {
                powerBtn = `
                    <button class="display-power-btn ${monitor.power_on ? 'on' : 'off'}" id="power-btn-${monitor.id}"
                            onclick="toggleDisplayPower(${monitor.id}, '${monitor.name.replace(/'/g, "\\'")}')"
                            title="${monitor.power_on ? t('display.power_off') : t('display.power_on')}">
                        <svg viewBox="0 0 24 24" width="18" height="18"><path fill="currentColor" d="M13 3h-2v10h2V3zm4.83 2.17l-1.42 1.42A6.92 6.92 0 0119 12c0 3.87-3.13 7-7 7s-7-3.13-7-7c0-2.27 1.08-4.28 2.76-5.56L6.34 5.02A8.95 8.95 0 003 12c0 4.97 4.03 9 9 9s9-4.03 9-9a8.95 8.95 0 00-3.17-6.83z"/></svg>
                    </button>`;
            }

            const details = [monitor.resolution, monitor.manufacturer].filter(Boolean).join(' \u00B7 ');
            const detailsHtml = details ? `<span class="display-monitor-details">${details}</span>` : '';
            const primaryBadge = monitor.is_primary ? `<span class="display-primary-badge">${t('display.primary')}</span>` : '';

            card.innerHTML = `
                <div class="display-monitor-header">
                    <svg class="display-monitor-icon" viewBox="0 0 24 24" width="20" height="20">
                        <path fill="currentColor" d="M20 3H4c-1.1 0-2 .9-2 2v10c0 1.1.9 2 2 2h6v2H8v2h8v-2h-2v-2h6c1.1 0 2-.9 2-2V5c0-1.1-.9-2-2-2zm0 12H4V5h16v10z"/>
                    </svg>
                    <div class="display-monitor-info">
                        <span class="display-monitor-name">${monitor.name}${primaryBadge}</span>
                        ${detailsHtml}
                    </div>
                    ${powerBtn}
                </div>
                <div class="display-brightness-control">
                    <svg class="display-brightness-icon" viewBox="0 0 24 24" width="16" height="16">
                        <path fill="currentColor" d="M20 8.69V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12 20 8.69zM12 18c-3.31 0-6-2.69-6-6s2.69-6 6-6 6 2.69 6 6-2.69 6-6 6zm0-10c-2.21 0-4 1.79-4 4s1.79 4 4 4 4-1.79 4-4-1.79-4-4-4z"/>
                    </svg>
                    <input type="range" class="display-brightness-slider" min="0" max="100" value="${brightnessValue}" ${brightnessDisabled}
                           oninput="onDisplayBrightnessInput(${monitor.id}, this.value)"
                           onchange="onDisplayBrightnessChange(${monitor.id}, this.value)">
                    <span class="display-brightness-value" id="brightness-val-${monitor.id}">${brightnessValue}%</span>
                </div>`;

            container.appendChild(card);
        });
    } catch (e) {
        console.error('Failed to load display monitors:', e);
    }
}

function onDisplayBrightnessInput(monitorId, value) {
    const label = document.getElementById(`brightness-val-${monitorId}`);
    if (label) label.textContent = `${value}%`;

    if (displayBrightnessTimers[monitorId]) clearTimeout(displayBrightnessTimers[monitorId]);
    displayBrightnessTimers[monitorId] = setTimeout(() => {
        sendDisplayBrightness(monitorId, parseInt(value));
        displayBrightnessTimers[monitorId] = null;
    }, DISPLAY_THROTTLE_MS);
}

function onDisplayBrightnessChange(monitorId, value) {
    if (displayBrightnessTimers[monitorId]) {
        clearTimeout(displayBrightnessTimers[monitorId]);
        displayBrightnessTimers[monitorId] = null;
    }
    sendDisplayBrightness(monitorId, parseInt(value));
}

async function sendDisplayBrightness(monitorId, brightness) {
    const token = localStorage.getItem('media_server_token');
    try {
        await fetch(`/api/display/brightness/${monitorId}`, {
            method: 'POST',
            headers: {
                'Authorization': `Bearer ${token}`,
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({ brightness })
        });
    } catch (e) {
        console.error('Failed to set brightness:', e);
    }
}

async function toggleDisplayPower(monitorId, monitorName) {
    const btn = document.getElementById(`power-btn-${monitorId}`);
    const isOn = btn && btn.classList.contains('on');
    const newState = !isOn;

    const token = localStorage.getItem('media_server_token');
    try {
        const response = await fetch(`/api/display/power/${monitorId}`, {
            method: 'POST',
            headers: {
                'Authorization': `Bearer ${token}`,
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({ on: newState })
        });
        const data = await response.json();
        if (data.success) {
            if (btn) {
                btn.classList.toggle('on', newState);
                btn.classList.toggle('off', !newState);
                btn.title = newState ? t('display.power_off') : t('display.power_on');
            }
            showToast(newState ? 'Monitor turned on' : 'Monitor turned off', 'success');
        } else {
            showToast('Failed to change monitor power', 'error');
        }
    } catch (e) {
        console.error('Failed to set display power:', e);
        showToast('Failed to change monitor power', 'error');
    }
}

// ============================================================
// Header Quick Links
// ============================================================

async function loadHeaderLinks() {
    const token = localStorage.getItem('media_server_token');
    if (!token) return;

    const container = document.getElementById('headerLinks');
    if (!container) return;

    try {
        const response = await fetch('/api/links/list', {
            headers: { 'Authorization': `Bearer ${token}` }
        });

        if (!response.ok) return;

        const links = await response.json();
        container.innerHTML = '';

        for (const link of links) {
            const a = document.createElement('a');
            a.href = link.url;
            a.target = '_blank';
            a.rel = 'noopener noreferrer';
            a.className = 'header-link';
            a.title = link.label || link.url;

            const iconSvg = await fetchMdiIcon(link.icon || 'mdi:link');
            a.innerHTML = iconSvg;

            container.appendChild(a);
        }
    } catch (e) {
        console.warn('Failed to load header links:', e);
    }
}

// ============================================================
// Links Management
// ============================================================

let _loadLinksPromise = null;
let linkFormDirty = false;

async function loadLinksTable() {
    if (_loadLinksPromise) return _loadLinksPromise;
    _loadLinksPromise = _loadLinksTableImpl();
    _loadLinksPromise.finally(() => { _loadLinksPromise = null; });
    return _loadLinksPromise;
}

async function _loadLinksTableImpl() {
    const token = localStorage.getItem('media_server_token');
    const tbody = document.getElementById('linksTableBody');

    try {
        const response = await fetch('/api/links/list', {
            headers: { 'Authorization': `Bearer ${token}` }
        });

        if (!response.ok) {
            throw new Error('Failed to fetch links');
        }

        const linksList = await response.json();

        if (linksList.length === 0) {
            tbody.innerHTML = '<tr><td colspan="4" class="empty-state"><div class="empty-state-illustration"><svg viewBox="0 0 64 64"><path d="M26 20a10 10 0 010 14l-6 6a10 10 0 01-14-14l6-6a10 10 0 0114 0" fill="none" stroke="currentColor" stroke-width="2"/><path d="M38 44a10 10 0 010-14l6-6a10 10 0 0114 14l-6 6a10 10 0 01-14 0" fill="none" stroke="currentColor" stroke-width="2"/><path d="M24 40l16-16" stroke="currentColor" stroke-width="2"/></svg><p>' + t('links.empty') + '</p></div></td></tr>';
            return;
        }

        tbody.innerHTML = linksList.map(link => `
            <tr>
                <td><span class="name-with-icon"><span class="table-icon" data-mdi-icon="${escapeHtml(link.icon || 'mdi:link')}"></span><code>${escapeHtml(link.name)}</code></span></td>
                <td style="max-width: 200px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;"
                    title="${escapeHtml(link.url)}">${escapeHtml(link.url)}</td>
                <td>${escapeHtml(link.label || '')}</td>
                <td>
                    <div class="action-buttons">
                        <button class="action-btn" data-action="edit" data-link-name="${escapeHtml(link.name)}" title="${t('links.button.edit')}">
                            <svg viewBox="0 0 24 24"><path d="M3 17.25V21h3.75L17.81 9.94l-3.75-3.75L3 17.25zM20.71 7.04c.39-.39.39-1.02 0-1.41l-2.34-2.34c-.39-.39-1.02-.39-1.41 0l-1.83 1.83 3.75 3.75 1.83-1.83z"/></svg>
                        </button>
                        <button class="action-btn delete" data-action="delete" data-link-name="${escapeHtml(link.name)}" title="${t('links.button.delete')}">
                            <svg viewBox="0 0 24 24"><path d="M6 19c0 1.1.9 2 2 2h8c1.1 0 2-.9 2-2V7H6v12zM19 4h-3.5l-1-1h-5l-1 1H5v2h14V4z"/></svg>
                        </button>
                    </div>
                </td>
            </tr>
        `).join('');
        resolveMdiIcons(tbody);
    } catch (error) {
        console.error('Error loading links:', error);
        tbody.innerHTML = '<tr><td colspan="4" class="empty-state" style="color: var(--error);">Failed to load links</td></tr>';
    }
}

function showAddLinkDialog() {
    const dialog = document.getElementById('linkDialog');
    const form = document.getElementById('linkForm');
    const title = document.getElementById('linkDialogTitle');

    form.reset();
    document.getElementById('linkOriginalName').value = '';
    document.getElementById('linkIsEdit').value = 'false';
    document.getElementById('linkName').disabled = false;
    document.getElementById('linkIconPreview').innerHTML = '';
    title.textContent = t('links.dialog.add');

    linkFormDirty = false;

    document.body.classList.add('dialog-open');
    dialog.showModal();
}

async function showEditLinkDialog(linkName) {
    const token = localStorage.getItem('media_server_token');
    const dialog = document.getElementById('linkDialog');
    const title = document.getElementById('linkDialogTitle');

    try {
        const response = await fetch('/api/links/list', {
            headers: { 'Authorization': `Bearer ${token}` }
        });

        if (!response.ok) {
            throw new Error('Failed to fetch link details');
        }

        const linksList = await response.json();
        const link = linksList.find(l => l.name === linkName);

        if (!link) {
            showToast(t('links.msg.not_found'), 'error');
            return;
        }

        document.getElementById('linkOriginalName').value = linkName;
        document.getElementById('linkIsEdit').value = 'true';
        document.getElementById('linkName').value = linkName;
        document.getElementById('linkName').disabled = true;
        document.getElementById('linkUrl').value = link.url;
        document.getElementById('linkIcon').value = link.icon || '';
        document.getElementById('linkLabel').value = link.label || '';
        document.getElementById('linkDescription').value = link.description || '';

        // Update icon preview
        const preview = document.getElementById('linkIconPreview');
        if (link.icon) {
            fetchMdiIcon(link.icon).then(svg => { preview.innerHTML = svg; });
        } else {
            preview.innerHTML = '';
        }

        title.textContent = t('links.dialog.edit');

        linkFormDirty = false;

        document.body.classList.add('dialog-open');
        dialog.showModal();
    } catch (error) {
        console.error('Error loading link for edit:', error);
        showToast(t('links.msg.load_failed'), 'error');
    }
}

async function closeLinkDialog() {
    if (linkFormDirty) {
        if (!await showConfirm(t('links.confirm.unsaved'))) {
            return;
        }
    }

    const dialog = document.getElementById('linkDialog');
    linkFormDirty = false;
    dialog.close();
    document.body.classList.remove('dialog-open');
}

async function saveLink(event) {
    event.preventDefault();

    const submitBtn = event.target.querySelector('button[type="submit"]');
    if (submitBtn) submitBtn.disabled = true;

    const token = localStorage.getItem('media_server_token');
    const isEdit = document.getElementById('linkIsEdit').value === 'true';
    const linkName = isEdit ?
        document.getElementById('linkOriginalName').value :
        document.getElementById('linkName').value;

    const data = {
        url: document.getElementById('linkUrl').value,
        icon: document.getElementById('linkIcon').value || 'mdi:link',
        label: document.getElementById('linkLabel').value || '',
        description: document.getElementById('linkDescription').value || ''
    };

    const endpoint = isEdit ?
        `/api/links/update/${linkName}` :
        `/api/links/create/${linkName}`;

    const method = isEdit ? 'PUT' : 'POST';

    try {
        const response = await fetch(endpoint, {
            method,
            headers: {
                'Authorization': `Bearer ${token}`,
                'Content-Type': 'application/json'
            },
            body: JSON.stringify(data)
        });

        const result = await response.json();

        if (response.ok && result.success) {
            showToast(t(isEdit ? 'links.msg.updated' : 'links.msg.created'), 'success');
            linkFormDirty = false;
            closeLinkDialog();
        } else {
            showToast(result.detail || t(isEdit ? 'links.msg.update_failed' : 'links.msg.create_failed'), 'error');
        }
    } catch (error) {
        console.error('Error saving link:', error);
        showToast(t(isEdit ? 'links.msg.update_failed' : 'links.msg.create_failed'), 'error');
    } finally {
        if (submitBtn) submitBtn.disabled = false;
    }
}

async function deleteLinkConfirm(linkName) {
    if (!await showConfirm(t('links.confirm.delete').replace('{name}', linkName))) {
        return;
    }

    const token = localStorage.getItem('media_server_token');

    try {
        const response = await fetch(`/api/links/delete/${linkName}`, {
            method: 'DELETE',
            headers: {
                'Authorization': `Bearer ${token}`
            }
        });

        const result = await response.json();

        if (response.ok && result.success) {
            showToast(t('links.msg.deleted'), 'success');
        } else {
            showToast(result.detail || t('links.msg.delete_failed'), 'error');
        }
    } catch (error) {
        console.error('Error deleting link:', error);
        showToast(t('links.msg.delete_failed'), 'error');
    }
}