let currentEditFile = null;
let editorDirty = false;
let editorUndoStack = [];
let editorRedoStack = [];
let editorHistoryIndex = -1;

function getCsrfToken() {
    return document.querySelector('meta[name="csrf-token"]')?.content || '';
}

function updateLineNumbers() {
    const ta = document.getElementById('editorContent');
    const gutter = document.getElementById('editorGutter');
    const lines = ta.value.split('\n').length;
    const numbers = [];
    for (let i = 1; i <= lines; i++) {
        numbers.push('<span>' + i + '</span>');
    }
    gutter.innerHTML = numbers.join('');
}

function updateCursorPos() {
    const ta = document.getElementById('editorContent');
    const before = ta.value.substring(0, ta.selectionStart);
    const lines = before.split('\n');
    const line = lines.length;
    const col = lines[lines.length - 1].length + 1;
    document.getElementById('editorCursorPos').textContent = 'Ln ' + line + ', Col ' + col;
}

function highlightNginx(text) {
    let h = text
        .replace(/&/g, '&amp;')
        .replace(/</g, '&lt;')
        .replace(/>/g, '&gt;')
        .replace(/#(.*)$/gm, '<span class="hl-comment">#$1</span>')
        .replace(/\b(server|location|listen|server_name|root|index|try_files|include|fastcgi_pass|proxy_pass|return|rewrite|set|if|error_page|ssl_certificate|ssl_certificate_key|ssl_protocols|ssl_ciphers|add_header|access_log|error_log|keepalive|gzip|proxy_set_header|proxy_redirect|client_max_body_size|autoindex)\b/g, '<span class="hl-keyword">$1</span>')
        .replace(/\b(\d+)\b/g, '<span class="hl-number">$1</span>')
        .replace(/\b(https?|fastcgi|unix):\/\/[^\s;{]+/g, '<span class="hl-string">$&</span>')
        .replace(/'(.*?)'/g, '<span class="hl-string">\'$1\'</span>')
        .replace(/(\$\w+)/g, '<span class="hl-var">$1</span>')
        .replace(/\b(\w+\.\w+(?:\.\w+)*)\b/g, function(m) {
            if (m.includes('com') || m.includes('org') || m.includes('net') || m.includes('io') || m.includes('local')) {
                return '<span class="hl-string">' + m + '</span>';
            }
            return m;
        });
    return h;
}

function syncHighlight() {
    const ta = document.getElementById('editorContent');
    const code = document.getElementById('editorHighlightCode');
    code.innerHTML = highlightNginx(ta.value) + '\n';
}

function pushHistory() {
    const ta = document.getElementById('editorContent');
    if (editorHistoryIndex >= 0 && editorUndoStack[editorHistoryIndex] === ta.value) return;
    editorUndoStack = editorUndoStack.slice(0, editorHistoryIndex + 1);
    editorUndoStack.push(ta.value);
    editorRedoStack = [];
    editorHistoryIndex = editorUndoStack.length - 1;
    if (editorUndoStack.length > 100) {
        editorUndoStack.shift();
        editorHistoryIndex--;
    }
}

function undoEditor() {
    if (editorHistoryIndex <= 0) return;
    editorRedoStack.push(editorUndoStack[editorHistoryIndex]);
    editorHistoryIndex--;
    const ta = document.getElementById('editorContent');
    ta.value = editorUndoStack[editorHistoryIndex];
    ta.dispatchEvent(new Event('input'));
}

function redoEditor() {
    if (editorRedoStack.length === 0) return;
    const val = editorRedoStack.pop();
    editorUndoStack.push(val);
    editorHistoryIndex++;
    const ta = document.getElementById('editorContent');
    ta.value = val;
    ta.dispatchEvent(new Event('input'));
}

function nginxAction(action) {
    const btn = event.target.closest('button');
    const origText = btn.innerHTML;
    btn.disabled = true;
    btn.innerHTML = '<i class="fas fa-spinner fa-spin"></i> Working...';

    fetch('/servers/' + serverId + '/nginx', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/x-www-form-urlencoded',
            'X-CSRF-Token': getCsrfToken(),
        },
        body: 'action=' + action + '&_csrf_token=' + encodeURIComponent(getCsrfToken()),
    })
    .then(r => r.json())
    .then(data => {
        showToast(data.success ? 'success' : 'error', data.message);
        if (data.output) {
            document.getElementById('nginxResultMessage').textContent = data.message;
            document.getElementById('nginxResultOutputText').textContent = data.output;
            document.getElementById('nginxResultOutput').style.display = 'block';
            document.getElementById('nginxResultModal').style.display = 'flex';
        }
        if (data.success && ['restart', 'reload', 'start', 'stop'].includes(action)) {
            setTimeout(() => location.reload(), 1500);
        }
    })
    .catch(err => showToast('error', 'Request failed: ' + err.message))
    .finally(() => { btn.disabled = false; btn.innerHTML = origText; });
}

function editFile(file) {
    currentEditFile = file;
    editorUndoStack = [];
    editorRedoStack = [];
    editorHistoryIndex = -1;
    editorDirty = false;
    document.getElementById('editorFilePath').textContent = file;
    document.getElementById('editorContent').value = 'Loading...';
    document.getElementById('editorStatus').textContent = 'Loading...';
    document.getElementById('editorDirtyIndicator').style.display = 'none';
    document.getElementById('editorFileSize').textContent = '';
    document.getElementById('nginxEditorModal').style.display = 'flex';
    setTimeout(() => document.getElementById('editorContent').focus(), 100);

    fetch('/servers/' + serverId + '/nginx/file?file=' + encodeURIComponent(file))
    .then(r => r.json())
    .then(data => {
        if (data.success) {
            const ta = document.getElementById('editorContent');
            ta.value = data.content;
            document.getElementById('editorFileSize').textContent = (data.content.length / 1024).toFixed(1) + ' KB';
            document.getElementById('editorStatus').textContent = 'Ready';
            document.getElementById('editorDirtyIndicator').style.display = 'none';
            editorDirty = false;
            updateLineNumbers();
            syncHighlight();
            pushHistory();
        } else {
            showToast('error', data.message);
            closeEditor();
        }
    })
    .catch(err => {
        showToast('error', 'Failed to load file');
        closeEditor();
    });

    const ta = document.getElementById('editorContent');
    ta.oninput = function() {
        editorDirty = true;
        document.getElementById('editorStatus').textContent = 'Unsaved changes';
        document.getElementById('editorDirtyIndicator').style.display = 'inline';
        updateLineNumbers();
        syncHighlight();
        pushHistory();
    };
    ta.onscroll = function() {
        document.getElementById('editorGutter').scrollTop = this.scrollTop;
        document.getElementById('editorHighlight').scrollTop = this.scrollTop;
    };
    ta.onkeydown = function(e) {
        if (e.key === 'Tab') {
            e.preventDefault();
            const start = this.selectionStart;
            const end = this.selectionEnd;
            this.value = this.value.substring(0, start) + '    ' + this.value.substring(end);
            this.selectionStart = this.selectionEnd = start + 4;
            this.dispatchEvent(new Event('input'));
        }
    };
    ta.onmouseup = ta.onkeyup = function() {
        updateCursorPos();
    };
    ta.addEventListener('paste', function() {
        setTimeout(() => {
            this.dispatchEvent(new Event('input'));
            updateCursorPos();
        }, 10);
    });
}

function saveFile() {
    const content = document.getElementById('editorContent').value;
    document.getElementById('editorStatus').textContent = 'Saving...';

    fetch('/servers/' + serverId + '/nginx/file', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/x-www-form-urlencoded',
            'X-CSRF-Token': getCsrfToken(),
        },
        body: 'file=' + encodeURIComponent(currentEditFile) + '&content=' + encodeURIComponent(content) + '&_csrf_token=' + encodeURIComponent(getCsrfToken()),
    })
    .then(r => r.json())
    .then(data => {
        showToast(data.success ? 'success' : 'error', data.message);
        if (data.success) {
            editorDirty = false;
            document.getElementById('editorStatus').textContent = 'Saved';
            document.getElementById('editorDirtyIndicator').style.display = 'none';
            closeEditor();
            setTimeout(() => location.reload(), 500);
        } else {
            document.getElementById('editorStatus').textContent = 'Save failed';
        }
    })
    .catch(err => {
        showToast('error', 'Save request failed');
        document.getElementById('editorStatus').textContent = 'Error';
    });
}

function deleteSite(site) {
    if (!confirm("Permanently delete site '" + site + "'?\nThis will remove both the config file and site directory contents.")) return;
    if (!confirm("Are you sure? This cannot be undone.")) return;

    fetch('/servers/' + serverId + '/nginx/site', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/x-www-form-urlencoded',
            'X-CSRF-Token': getCsrfToken(),
        },
        body: '_method=DELETE&site=' + encodeURIComponent(site) + '&_csrf_token=' + encodeURIComponent(getCsrfToken()),
    })
    .then(r => r.json())
    .then(data => {
        showToast(data.success ? 'success' : 'error', data.message);
        if (data.success) setTimeout(() => location.reload(), 500);
    })
    .catch(err => showToast('error', 'Request failed: ' + err.message));
}

function toggleSite(site, enable) {
    const action = enable ? 'enable' : 'disable';
    if (!confirm((enable ? 'Enable' : 'Disable') + " site '" + site + "'?")) return;

    fetch('/servers/' + serverId + '/nginx/toggle-site', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/x-www-form-urlencoded',
            'X-CSRF-Token': getCsrfToken(),
        },
        body: 'site=' + encodeURIComponent(site) + '&enable=' + (enable ? '1' : '0') + '&_csrf_token=' + encodeURIComponent(getCsrfToken()),
    })
    .then(r => r.json())
    .then(data => {
        showToast(data.success ? 'success' : 'error', data.message);
        if (data.success) setTimeout(() => location.reload(), 500);
    })
    .catch(err => showToast('error', 'Request failed: ' + err.message));
}

function closeEditor() {
    if (editorDirty && !confirm('Discard unsaved changes?')) return;
    document.getElementById('nginxEditorModal').style.display = 'none';
    currentEditFile = null;
    editorDirty = false;
}

function closeNginxModal() {
    document.getElementById('nginxResultModal').style.display = 'none';
    document.getElementById('nginxResultOutput').style.display = 'none';
}

function openNewSiteModal() {
    document.getElementById('newSiteForm').reset();
    document.getElementById('siteServerName').value = '';
    document.getElementById('sitePhp').checked = true;
    document.getElementById('siteEnable').checked = true;
    document.getElementById('nginxNewSiteModal').style.display = 'flex';
}

function closeNewSiteModal() {
    document.getElementById('nginxNewSiteModal').style.display = 'none';
}

function createSite(e) {
    e.preventDefault();
    const btn = document.getElementById('createSiteBtn');
    btn.disabled = true;
    btn.innerHTML = '<i class="fas fa-spinner fa-spin"></i> Creating...';

    const formData = new URLSearchParams(new FormData(document.getElementById('newSiteForm')));
    formData.append('_csrf_token', getCsrfToken());

    fetch('/servers/' + serverId + '/nginx/site', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/x-www-form-urlencoded',
            'X-CSRF-Token': getCsrfToken(),
        },
        body: formData.toString(),
    })
    .then(r => r.json())
    .then(data => {
        showToast(data.success ? 'success' : 'error', data.message);
        if (data.success) {
            closeNewSiteModal();
            setTimeout(() => location.reload(), 800);
        }
    })
    .catch(err => showToast('error', 'Request failed: ' + err.message))
    .finally(() => { btn.disabled = false; btn.innerHTML = '<i class="fas fa-plus"></i> Create Site'; });
}

document.addEventListener('keydown', function(e) {
    if (e.key === 'Escape') { closeEditor(); closeNginxModal(); }
    if ((e.ctrlKey || e.metaKey) && e.key === 's' && currentEditFile) {
        e.preventDefault();
        saveFile();
    }
});