<?php
/**
 * Nodes Management Page
 */

$asnManager = new ASN($db);
$nodeManager = new Node($db);
$validator = new Validator();

$action = $_GET['action'] ?? 'list';
$id = $_GET['id'] ?? null;
$message = '';
$error = '';

// Handle form submissions
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    if (!$auth->verifyCsrfToken($_POST['csrf_token'] ?? '')) {
        $error = 'Invalid security token. Please try again.';
    } else {
        $postAction = $_POST['action'] ?? '';
        
        switch ($postAction) {
            case 'create':
                if (!hasPermission('create_peers')) {
                    $error = 'You do not have permission to create nodes.';
                    break;
                }
                
                $asnId = $_POST['asn_id'] ?? '';
                $name = trim($_POST['name'] ?? '');
                $description = trim($_POST['description'] ?? '');
                
                if (empty($asnId)) {
                    $error = 'Please select an ASN.';
                    break;
                }
                
                if (empty($name)) {
                    $error = 'Name is required.';
                    break;
                }
                
                $config = buildNodeConfigFromForm($_POST);
                
                $result = $nodeManager->create($asnId, $name, $description, $config);
                
                if ($result['success']) {
                    $logger->log('node', 'Created node', ['name' => $name, 'asn_id' => $asnId]);
                    header('Location: ?page=nodes&message=Node created successfully');
                    exit;
                } else {
                    $error = $result['message'];
                }
                break;
                
            case 'update':
                if (!hasPermission('edit_peers')) {
                    $error = 'You do not have permission to edit nodes.';
                    break;
                }
                
                $id = $_POST['id'] ?? '';
                $name = trim($_POST['name'] ?? '');
                $description = trim($_POST['description'] ?? '');
                
                if (empty($name)) {
                    $error = 'Name is required.';
                    break;
                }
                
                $config = buildNodeConfigFromForm($_POST);
                
                $result = $nodeManager->update($id, [
                    'name' => $name,
                    'description' => $description,
                    'config' => $config,
                ]);
                
                if ($result['success']) {
                    $logger->log('node', 'Updated node', ['id' => $id, 'name' => $name]);
                    header('Location: ?page=nodes&message=Node updated successfully');
                    exit;
                } else {
                    $error = $result['message'];
                }
                break;
                
            case 'delete':
                if (!hasPermission('delete_peers')) {
                    $error = 'You do not have permission to delete nodes.';
                    break;
                }
                
                $id = $_POST['id'] ?? '';
                $node = $nodeManager->get($id);
                
                if (!$node) {
                    $error = 'Node not found.';
                    break;
                }
                
                $result = $nodeManager->delete($id);
                
                if ($result['success']) {
                    $logger->log('node', 'Deleted node', ['name' => $node['name']]);
                    header('Location: ?page=nodes&message=Node deleted successfully');
                    exit;
                } else {
                    $error = $result['message'];
                }
                break;
        }
    }
}

// Get message from query string
if (isset($_GET['message'])) {
    $message = $_GET['message'];
}

// Helper function to build config from form
function buildNodeConfigFromForm(array $post): array {
    $config = [];
    
    // String fields
    $stringFields = [
        'router_id', 'source4', 'source6', 'hostname', 'bird_directory',
        'bird_socket', 'cache_directory', 'irr_server', 'rtr_server',
    ];
    
    foreach ($stringFields as $field) {
        if (isset($post[$field]) && $post[$field] !== '') {
            $config[$field] = trim($post[$field]);
        }
    }
    
    // Boolean fields
    $booleanFields = [
        'keep_filtered', 'rpki_filter', 'irr_filter',
    ];
    
    foreach ($booleanFields as $field) {
        if (isset($post[$field])) {
            $config[$field] = $post[$field] === '1';
        }
    }
    
    // Prefixes
    if (!empty($post['prefixes4'])) {
        $config['prefixes'] = array_filter(array_map('trim', explode(',', $post['prefixes4'])));
    }
    
    if (!empty($post['prefixes6'])) {
        $config['prefixes6'] = array_filter(array_map('trim', explode(',', $post['prefixes6'])));
    }
    
    // Templates
    if (!empty($post['templates'])) {
        $config['templates'] = array_filter(array_map('trim', explode(',', $post['templates'])));
    }
    
    return $config;
}

// Get node for edit
$editNode = null;
if ($action === 'edit' && $id) {
    $editNode = $nodeManager->get($id);
    if (!$editNode) {
        $error = 'Node not found.';
        $action = 'list';
    }
}

// Get all ASNs and nodes
$asns = $asnManager->getAll();
$nodes = $nodeManager->getAll();

// Filter by ASN if specified
$filterAsnId = $_GET['asn_id'] ?? '';
if ($filterAsnId) {
    $nodes = array_filter($nodes, fn($n) => $n['asn_id'] === $filterAsnId);
}
?>

<?php if ($action === 'list'): ?>
<!-- List View -->
<div class="page-header">
    <div class="d-flex flex-items-center flex-justify-between">
        <div>
            <h1 class="h2 mb-1">Nodes</h1>
            <p class="color-fg-muted mb-0">Manage your router nodes</p>
        </div>
        <?php if (hasPermission('create_peers')): ?>
        <a href="?page=nodes&action=create" class="btn btn-primary">
            <svg class="octicon mr-1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" width="16" height="16"><path fill-rule="evenodd" d="M7.75 2a.75.75 0 01.75.75V7h4.25a.75.75 0 110 1.5H8.5v4.25a.75.75 0 11-1.5 0V8.5H2.75a.75.75 0 010-1.5H7V2.75A.75.75 0 017.75 2z"/></svg>
            New Node
        </a>
        <?php endif; ?>
    </div>
</div>

<div class="page-content">
    <?php if ($message): ?>
    <div class="flash flash-success mb-3">
        <?= e($message) ?>
    </div>
    <?php endif; ?>
    
    <?php if ($error): ?>
    <div class="flash flash-error mb-3">
        <?= e($error) ?>
    </div>
    <?php endif; ?>
    
    <!-- Filter -->
    <?php if (!empty($asns)): ?>
    <div class="mb-3">
        <form method="GET" class="d-flex flex-items-center" style="gap: 8px;">
            <input type="hidden" name="page" value="nodes">
            <select name="asn_id" class="form-select" onchange="this.form.submit()">
                <option value="">All ASNs</option>
                <?php foreach ($asns as $asn): ?>
                <option value="<?= e($asn['id']) ?>" <?= $filterAsnId === $asn['id'] ? 'selected' : '' ?>>
                    AS<?= e($asn['asn']) ?> - <?= e($asn['name']) ?>
                </option>
                <?php endforeach; ?>
            </select>
        </form>
    </div>
    <?php endif; ?>
    
    <?php if (empty($nodes)): ?>
    <div class="blankslate">
        <svg class="octicon blankslate-icon" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" width="24" height="24"><path fill-rule="evenodd" d="M1.75 1A1.75 1.75 0 000 2.75v4c0 .372.116.717.314 1a1.742 1.742 0 00-.314 1v4c0 .966.784 1.75 1.75 1.75h12.5A1.75 1.75 0 0016 12.75v-4c0-.372-.116-.717-.314-1 .198-.283.314-.628.314-1v-4A1.75 1.75 0 0014.25 1H1.75z"/></svg>
        <h3 class="blankslate-heading">No nodes configured</h3>
        <p>Get started by creating your first node.</p>
        <?php if (hasPermission('create_peers')): ?>
        <a href="?page=nodes&action=create" class="btn btn-primary">Create Node</a>
        <?php endif; ?>
    </div>
    <?php else: ?>
    <div class="Box">
        <div class="overflow-auto">
            <table class="data-table">
                <thead>
                    <tr>
                        <th>Name</th>
                        <th>ASN</th>
                        <th>Router ID</th>
                        <th>Description</th>
                        <th>Peers</th>
                        <th></th>
                    </tr>
                </thead>
                <tbody>
                    <?php 
                    $peerManager = new Peer($db);
                    foreach ($nodes as $node): 
                        $nodeAsn = $asnManager->get($node['asn_id']);
                        $nodePeers = $peerManager->getByNode($node['id']);
                    ?>
                    <tr>
                        <td class="text-bold"><?= e($node['name']) ?></td>
                        <td>
                            <?php if ($nodeAsn): ?>
                            <span class="Label Label--secondary">AS<?= e($nodeAsn['asn']) ?></span>
                            <?php else: ?>
                            <span class="color-fg-muted">-</span>
                            <?php endif; ?>
                        </td>
                        <td>
                            <code><?= e($node['config']['router_id'] ?? '-') ?></code>
                        </td>
                        <td class="color-fg-muted"><?= e($node['description'] ?? '-') ?></td>
                        <td>
                            <span class="Counter"><?= count($nodePeers) ?></span>
                        </td>
                        <td class="text-right">
                            <a href="?page=peers&node_id=<?= e($node['id']) ?>" class="btn btn-sm">View Peers</a>
                            <a href="?page=nodes&action=edit&id=<?= e($node['id']) ?>" class="btn btn-sm">Edit</a>
                            <?php if (hasPermission('delete_peers')): ?>
                            <form method="POST" class="d-inline" onsubmit="return confirmDelete('Are you sure you want to delete <?= e($node['name']) ?>?')">
                                <?= csrfField() ?>
                                <input type="hidden" name="action" value="delete">
                                <input type="hidden" name="id" value="<?= e($node['id']) ?>">
                                <button type="submit" class="btn btn-sm btn-danger">Delete</button>
                            </form>
                            <?php endif; ?>
                        </td>
                    </tr>
                    <?php endforeach; ?>
                </tbody>
            </table>
        </div>
    </div>
    <?php endif; ?>
</div>

<?php elseif ($action === 'create' || $action === 'edit'): ?>
<!-- Create/Edit Form -->
<div class="page-header">
    <div class="d-flex flex-items-center">
        <a href="?page=nodes" class="btn-octicon mr-2">
            <svg class="octicon" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" width="16" height="16"><path fill-rule="evenodd" d="M7.78 12.53a.75.75 0 01-1.06 0L2.47 8.28a.75.75 0 010-1.06l4.25-4.25a.75.75 0 011.06 1.06L4.81 7h7.44a.75.75 0 010 1.5H4.81l2.97 2.97a.75.75 0 010 1.06z"/></svg>
        </a>
        <div>
            <h1 class="h2 mb-1"><?= $action === 'edit' ? 'Edit Node' : 'New Node' ?></h1>
            <p class="color-fg-muted mb-0">
                <?= $action === 'edit' ? e($editNode['name']) : 'Configure a new router node' ?>
            </p>
        </div>
    </div>
</div>

<div class="page-content">
    <?php if (empty($asns)): ?>
    <div class="flash flash-warn mb-3">
        <strong>No ASNs found.</strong> You need to create an ASN before creating nodes.
        <a href="?page=asns&action=create" class="Link--primary">Create ASN</a>
    </div>
    <?php else: ?>
    
    <?php if ($error): ?>
    <div class="flash flash-error mb-3">
        <?= e($error) ?>
    </div>
    <?php endif; ?>
    
    <form method="POST" action="">
        <?= csrfField() ?>
        <input type="hidden" name="action" value="<?= $action === 'edit' ? 'update' : 'create' ?>">
        <?php if ($editNode): ?>
        <input type="hidden" name="id" value="<?= e($editNode['id']) ?>">
        <?php endif; ?>
        
        <div class="Box mb-4">
            <div class="Box-header">
                <h3 class="Box-title">Basic Information</h3>
            </div>
            <div class="Box-body">
                <div class="form-group">
                    <label class="form-label" for="asn_id">ASN *</label>
                    <select id="asn_id" 
                            name="asn_id" 
                            class="form-select" 
                            style="max-width: 400px;"
                            <?= $editNode ? 'disabled' : 'required' ?>>
                        <option value="">Select an ASN</option>
                        <?php foreach ($asns as $asn): ?>
                        <option value="<?= e($asn['id']) ?>" <?= ($editNode['asn_id'] ?? '') === $asn['id'] ? 'selected' : '' ?>>
                            AS<?= e($asn['asn']) ?> - <?= e($asn['name']) ?>
                        </option>
                        <?php endforeach; ?>
                    </select>
                    <?php if ($editNode): ?>
                    <input type="hidden" name="asn_id" value="<?= e($editNode['asn_id']) ?>">
                    <?php endif; ?>
                </div>
                
                <div class="form-group">
                    <label class="form-label" for="name">Name *</label>
                    <input type="text" 
                           id="name" 
                           name="name" 
                           class="form-control form-input-wide" 
                           value="<?= e($editNode['name'] ?? '') ?>"
                           placeholder="e.g., router1.example.com"
                           required>
                    <p class="form-hint">A unique name for this node (usually the hostname)</p>
                </div>
                
                <div class="form-group">
                    <label class="form-label" for="description">Description</label>
                    <textarea id="description" 
                              name="description" 
                              class="form-control form-input-wide" 
                              rows="2"><?= e($editNode['description'] ?? '') ?></textarea>
                </div>
            </div>
        </div>
        
        <div class="Box mb-4">
            <div class="Box-header">
                <h3 class="Box-title">Network Configuration</h3>
            </div>
            <div class="Box-body">
                <p class="color-fg-muted mb-3">These settings override the ASN defaults for this specific node.</p>
                
                <div class="d-flex flex-wrap" style="gap: 16px;">
                    <div class="form-group flex-1" style="min-width: 200px;">
                        <label class="form-label" for="router_id">Router ID</label>
                        <input type="text" 
                               id="router_id" 
                               name="router_id" 
                               class="form-control" 
                               value="<?= e($editNode['config']['router_id'] ?? '') ?>"
                               placeholder="e.g., 192.0.2.1">
                    </div>
                    
                    <div class="form-group flex-1" style="min-width: 200px;">
                        <label class="form-label" for="hostname">Hostname</label>
                        <input type="text" 
                               id="hostname" 
                               name="hostname" 
                               class="form-control" 
                               value="<?= e($editNode['config']['hostname'] ?? '') ?>"
                               placeholder="router1">
                    </div>
                </div>
                
                <div class="d-flex flex-wrap" style="gap: 16px;">
                    <div class="form-group flex-1" style="min-width: 200px;">
                        <label class="form-label" for="source4">Source IPv4</label>
                        <input type="text" 
                               id="source4" 
                               name="source4" 
                               class="form-control" 
                               value="<?= e($editNode['config']['source4'] ?? '') ?>"
                               placeholder="e.g., 192.0.2.1">
                    </div>
                    
                    <div class="form-group flex-1" style="min-width: 200px;">
                        <label class="form-label" for="source6">Source IPv6</label>
                        <input type="text" 
                               id="source6" 
                               name="source6" 
                               class="form-control" 
                               value="<?= e($editNode['config']['source6'] ?? '') ?>"
                               placeholder="e.g., 2001:db8::1">
                    </div>
                </div>
                
                <div class="form-group">
                    <label class="form-label" for="prefixes4">IPv4 Prefixes</label>
                    <input type="text" 
                           id="prefixes4" 
                           name="prefixes4" 
                           class="form-control form-input-wide" 
                           value="<?= e(implode(', ', $editNode['config']['prefixes'] ?? [])) ?>"
                           placeholder="192.0.2.0/24, 198.51.100.0/24">
                    <p class="form-hint">Node-specific IPv4 prefixes (overrides ASN defaults)</p>
                </div>
                
                <div class="form-group">
                    <label class="form-label" for="prefixes6">IPv6 Prefixes</label>
                    <input type="text" 
                           id="prefixes6" 
                           name="prefixes6" 
                           class="form-control form-input-wide" 
                           value="<?= e(implode(', ', $editNode['config']['prefixes6'] ?? [])) ?>"
                           placeholder="2001:db8::/32">
                    <p class="form-hint">Node-specific IPv6 prefixes (overrides ASN defaults)</p>
                </div>
            </div>
        </div>
        
        <div class="Box mb-4">
            <div class="Box-header">
                <h3 class="Box-title">BIRD Configuration</h3>
            </div>
            <div class="Box-body">
                <div class="d-flex flex-wrap" style="gap: 16px;">
                    <div class="form-group flex-1" style="min-width: 200px;">
                        <label class="form-label" for="bird_directory">BIRD Directory</label>
                        <input type="text" 
                               id="bird_directory" 
                               name="bird_directory" 
                               class="form-control" 
                               value="<?= e($editNode['config']['bird_directory'] ?? '') ?>"
                               placeholder="/etc/bird">
                    </div>
                    
                    <div class="form-group flex-1" style="min-width: 200px;">
                        <label class="form-label" for="bird_socket">BIRD Socket</label>
                        <input type="text" 
                               id="bird_socket" 
                               name="bird_socket" 
                               class="form-control" 
                               value="<?= e($editNode['config']['bird_socket'] ?? '') ?>"
                               placeholder="/run/bird/bird.ctl">
                    </div>
                </div>
                
                <div class="form-group">
                    <label class="form-label" for="cache_directory">Cache Directory</label>
                    <input type="text" 
                           id="cache_directory" 
                           name="cache_directory" 
                           class="form-control" 
                           style="max-width: 400px;"
                           value="<?= e($editNode['config']['cache_directory'] ?? '') ?>"
                           placeholder="/var/cache/pathvector">
                </div>
            </div>
        </div>
        
        <div class="Box mb-4">
            <div class="Box-header">
                <h3 class="Box-title">Filtering Options</h3>
            </div>
            <div class="Box-body">
                <div class="d-flex flex-wrap" style="gap: 16px;">
                    <div class="form-group flex-1" style="min-width: 200px;">
                        <label class="form-label" for="irr_server">IRR Server</label>
                        <input type="text" 
                               id="irr_server" 
                               name="irr_server" 
                               class="form-control" 
                               value="<?= e($editNode['config']['irr_server'] ?? '') ?>"
                               placeholder="rr.ntt.net">
                    </div>
                    
                    <div class="form-group flex-1" style="min-width: 200px;">
                        <label class="form-label" for="rtr_server">RTR Server (RPKI)</label>
                        <input type="text" 
                               id="rtr_server" 
                               name="rtr_server" 
                               class="form-control" 
                               value="<?= e($editNode['config']['rtr_server'] ?? '') ?>"
                               placeholder="rtr.example.com:8282">
                    </div>
                </div>
                
                <div class="d-flex flex-wrap" style="gap: 24px;">
                    <div class="form-checkbox">
                        <label>
                            <input type="checkbox" 
                                   name="rpki_filter" 
                                   value="1"
                                   <?= ($editNode['config']['rpki_filter'] ?? false) ? 'checked' : '' ?>>
                            Enable RPKI filtering
                        </label>
                    </div>
                    
                    <div class="form-checkbox">
                        <label>
                            <input type="checkbox" 
                                   name="irr_filter" 
                                   value="1"
                                   <?= ($editNode['config']['irr_filter'] ?? false) ? 'checked' : '' ?>>
                            Enable IRR filtering
                        </label>
                    </div>
                    
                    <div class="form-checkbox">
                        <label>
                            <input type="checkbox" 
                                   name="keep_filtered" 
                                   value="1"
                                   <?= ($editNode['config']['keep_filtered'] ?? false) ? 'checked' : '' ?>>
                            Keep filtered routes
                        </label>
                    </div>
                </div>
            </div>
        </div>
        
        <div class="Box mb-4">
            <div class="Box-header">
                <h3 class="Box-title">Templates</h3>
            </div>
            <div class="Box-body">
                <div class="form-group">
                    <label class="form-label" for="templates">Default Templates</label>
                    <input type="text" 
                           id="templates" 
                           name="templates" 
                           class="form-control form-input-wide" 
                           value="<?= e(implode(', ', $editNode['config']['templates'] ?? [])) ?>"
                           placeholder="upstream, peer, downstream">
                    <p class="form-hint">Comma-separated list of default templates to use for this node</p>
                </div>
            </div>
        </div>
        
        <div class="d-flex flex-items-center" style="gap: 8px;">
            <button type="submit" class="btn btn-primary">
                <?= $action === 'edit' ? 'Update Node' : 'Create Node' ?>
            </button>
            <a href="?page=nodes" class="btn">Cancel</a>
        </div>
    </form>
    <?php endif; ?>
</div>
<?php endif; ?>