<?php
/**
 * ASNs Management Page
 */

$asnManager = new ASN($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 ASNs.';
                    break;
                }
                
                $asnNumber = trim($_POST['asn'] ?? '');
                $name = trim($_POST['name'] ?? '');
                $description = trim($_POST['description'] ?? '');
                
                // Validate ASN
                if (!$validator->validateASN($asnNumber)) {
                    $error = 'Invalid ASN number.';
                    break;
                }
                
                if (empty($name)) {
                    $error = 'Name is required.';
                    break;
                }
                
                // Build defaults from form
                $defaults = buildDefaultsFromForm($_POST);
                
                $result = $asnManager->create($asnNumber, $name, $description, $defaults);
                
                if ($result['success']) {
                    $logger->log('asn', 'Created ASN', ['asn' => $asnNumber, 'name' => $name]);
                    header('Location: ?page=asns&message=ASN created successfully');
                    exit;
                } else {
                    $error = $result['message'];
                }
                break;
                
            case 'update':
                if (!hasPermission('edit_peers')) {
                    $error = 'You do not have permission to edit ASNs.';
                    break;
                }
                
                $id = $_POST['id'] ?? '';
                $name = trim($_POST['name'] ?? '');
                $description = trim($_POST['description'] ?? '');
                
                if (empty($name)) {
                    $error = 'Name is required.';
                    break;
                }
                
                $defaults = buildDefaultsFromForm($_POST);
                
                $result = $asnManager->update($id, [
                    'name' => $name,
                    'description' => $description,
                    'defaults' => $defaults,
                ]);
                
                if ($result['success']) {
                    $logger->log('asn', 'Updated ASN', ['id' => $id, 'name' => $name]);
                    header('Location: ?page=asns&message=ASN updated successfully');
                    exit;
                } else {
                    $error = $result['message'];
                }
                break;
                
            case 'delete':
                if (!hasPermission('delete_peers')) {
                    $error = 'You do not have permission to delete ASNs.';
                    break;
                }
                
                $id = $_POST['id'] ?? '';
                $asn = $asnManager->get($id);
                
                if (!$asn) {
                    $error = 'ASN not found.';
                    break;
                }
                
                $result = $asnManager->delete($id);
                
                if ($result['success']) {
                    $logger->log('asn', 'Deleted ASN', ['asn' => $asn['asn'], 'name' => $asn['name']]);
                    header('Location: ?page=asns&message=ASN deleted successfully');
                    exit;
                } else {
                    $error = $result['message'];
                }
                break;
        }
    }
}

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

// Helper function to build defaults from form
function buildDefaultsFromForm(array $post): array {
    $defaults = [];
    
    // String fields
    $stringFields = [
        'router_id', 'source4', 'source6', 'irr_server', 'rtr_server',
        'bgpq_path', 'bgpq_args', 'bird_directory', 'bird_socket',
        'cache_directory', 'log_file', 'hostname', 'peeringdb_api_key',
        'peeringdb_cache_file', 'peeringdb_query_timeout', 'kernel_table',
    ];
    
    foreach ($stringFields as $field) {
        if (isset($post[$field]) && $post[$field] !== '') {
            $defaults[$field] = trim($post[$field]);
        }
    }
    
    // Boolean fields
    $booleanFields = [
        'keep_filtered', 'merge_paths', 'rpki_filter', 'irr_filter',
        'transit_locking', 'graceful_shutdown', 'no_announce',
    ];
    
    foreach ($booleanFields as $field) {
        if (isset($post[$field])) {
            $defaults[$field] = $post[$field] === '1';
        }
    }
    
    // Integer fields
    $intFields = [
        'default_route_limit4', 'default_route_limit6', 'pref_src4_placeholder',
        'pref_src6_placeholder', 'kernel_learn', 'kernel_export',
    ];
    
    foreach ($intFields as $field) {
        if (isset($post[$field]) && $post[$field] !== '') {
            $defaults[$field] = (int) $post[$field];
        }
    }
    
    // Array fields (comma-separated)
    $arrayFields = [
        'prefixes4' => 'prefixes4',
        'prefixes6' => 'prefixes6',
        'communities_blackhole' => 'blackhole',
        'communities_nopeer' => 'nopeer',
    ];
    
    foreach ($arrayFields as $postField => $defaultField) {
        if (isset($post[$postField]) && $post[$postField] !== '') {
            $values = array_filter(array_map('trim', explode(',', $post[$postField])));
            if (!empty($values)) {
                $defaults[$defaultField] = $values;
            }
        }
    }
    
    return $defaults;
}

// Get ASN for edit
$editAsn = null;
if ($action === 'edit' && $id) {
    $editAsn = $asnManager->get($id);
    if (!$editAsn) {
        $error = 'ASN not found.';
        $action = 'list';
    }
}

// Get all ASNs for list view
$asns = $asnManager->getAll();
?>

<?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">ASNs</h1>
            <p class="color-fg-muted mb-0">Manage your Autonomous System Numbers</p>
        </div>
        <?php if (hasPermission('create_peers')): ?>
        <a href="?page=asns&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 ASN
        </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; ?>
    
    <?php if (empty($asns)): ?>
    <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="M1.5 14.25c0 .138.112.25.25.25H4v-1.25a.75.75 0 01.75-.75h2.5a.75.75 0 01.75.75v1.25h2.25a.25.25 0 00.25-.25V1.75a.25.25 0 00-.25-.25h-8.5a.25.25 0 00-.25.25v12.5z"/></svg>
        <h3 class="blankslate-heading">No ASNs configured</h3>
        <p>Get started by creating your first ASN.</p>
        <?php if (hasPermission('create_peers')): ?>
        <a href="?page=asns&action=create" class="btn btn-primary">Create ASN</a>
        <?php endif; ?>
    </div>
    <?php else: ?>
    <div class="Box">
        <div class="overflow-auto">
            <table class="data-table">
                <thead>
                    <tr>
                        <th>ASN</th>
                        <th>Name</th>
                        <th>Description</th>
                        <th>Router ID</th>
                        <th>Nodes</th>
                        <th></th>
                    </tr>
                </thead>
                <tbody>
                    <?php 
                    $nodeManager = new Node($db);
                    foreach ($asns as $asn): 
                        $asnNodes = $nodeManager->getByAsn($asn['id']);
                    ?>
                    <tr>
                        <td>
                            <span class="Label Label--accent">AS<?= e($asn['asn']) ?></span>
                        </td>
                        <td class="text-bold"><?= e($asn['name']) ?></td>
                        <td class="color-fg-muted"><?= e($asn['description'] ?? '-') ?></td>
                        <td>
                            <code><?= e($asn['defaults']['router_id'] ?? '-') ?></code>
                        </td>
                        <td>
                            <span class="Counter"><?= count($asnNodes) ?></span>
                        </td>
                        <td class="text-right">
                            <a href="?page=asns&action=edit&id=<?= e($asn['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 AS<?= e($asn['asn']) ?>?')">
                                <?= csrfField() ?>
                                <input type="hidden" name="action" value="delete">
                                <input type="hidden" name="id" value="<?= e($asn['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=asns" 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 ASN' : 'New ASN' ?></h1>
            <p class="color-fg-muted mb-0">
                <?= $action === 'edit' ? 'AS' . e($editAsn['asn']) . ' - ' . e($editAsn['name']) : 'Configure a new Autonomous System Number' ?>
            </p>
        </div>
    </div>
</div>

<div class="page-content">
    <?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="<?= $action === 'edit' ? 'update' : 'create' ?>">
        <?php if ($editAsn): ?>
        <input type="hidden" name="id" value="<?= e($editAsn['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">ASN Number *</label>
                    <input type="number" 
                           id="asn" 
                           name="asn" 
                           class="form-control" 
                           style="max-width: 200px;"
                           value="<?= e($editAsn['asn'] ?? '') ?>"
                           min="1"
                           max="4294967295"
                           <?= $editAsn ? 'readonly' : 'required' ?>>
                    <p class="form-hint">Your Autonomous System Number (e.g., 65530)</p>
                </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($editAsn['name'] ?? '') ?>"
                           required>
                    <p class="form-hint">A friendly name for this ASN</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($editAsn['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">
                <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($editAsn['defaults']['router_id'] ?? '') ?>"
                               placeholder="e.g., 192.0.2.1">
                        <p class="form-hint">Default router ID for all nodes</p>
                    </div>
                    
                    <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($editAsn['defaults']['source4'] ?? '') ?>"
                               placeholder="e.g., 192.0.2.1">
                        <p class="form-hint">Default source address for IPv4</p>
                    </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($editAsn['defaults']['source6'] ?? '') ?>"
                               placeholder="e.g., 2001:db8::1">
                        <p class="form-hint">Default source address for IPv6</p>
                    </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(', ', $editAsn['defaults']['prefixes'] ?? [])) ?>"
                           placeholder="192.0.2.0/24, 198.51.100.0/24">
                    <p class="form-hint">Comma-separated list of IPv4 prefixes you originate</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(', ', $editAsn['defaults']['prefixes6'] ?? [])) ?>"
                           placeholder="2001:db8::/32">
                    <p class="form-hint">Comma-separated list of IPv6 prefixes you originate</p>
                </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($editAsn['defaults']['irr_server'] ?? 'rr.ntt.net') ?>"
                               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($editAsn['defaults']['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"
                                   <?= ($editAsn['defaults']['rpki_filter'] ?? false) ? 'checked' : '' ?>>
                            Enable RPKI filtering
                        </label>
                    </div>
                    
                    <div class="form-checkbox">
                        <label>
                            <input type="checkbox" 
                                   name="irr_filter" 
                                   value="1"
                                   <?= ($editAsn['defaults']['irr_filter'] ?? false) ? 'checked' : '' ?>>
                            Enable IRR filtering
                        </label>
                    </div>
                    
                    <div class="form-checkbox">
                        <label>
                            <input type="checkbox" 
                                   name="keep_filtered" 
                                   value="1"
                                   <?= ($editAsn['defaults']['keep_filtered'] ?? false) ? 'checked' : '' ?>>
                            Keep filtered routes
                        </label>
                    </div>
                </div>
                
                <div class="d-flex flex-wrap mt-3" style="gap: 16px;">
                    <div class="form-group flex-1" style="min-width: 150px;">
                        <label class="form-label" for="default_route_limit4">Default Route Limit (IPv4)</label>
                        <input type="number" 
                               id="default_route_limit4" 
                               name="default_route_limit4" 
                               class="form-control" 
                               value="<?= e($editAsn['defaults']['default_route_limit4'] ?? '') ?>"
                               min="0">
                    </div>
                    
                    <div class="form-group flex-1" style="min-width: 150px;">
                        <label class="form-label" for="default_route_limit6">Default Route Limit (IPv6)</label>
                        <input type="number" 
                               id="default_route_limit6" 
                               name="default_route_limit6" 
                               class="form-control" 
                               value="<?= e($editAsn['defaults']['default_route_limit6'] ?? '') ?>"
                               min="0">
                    </div>
                </div>
            </div>
        </div>
        
        <div class="Box mb-4">
            <div class="Box-header">
                <h3 class="Box-title">Pathvector Paths</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($editAsn['defaults']['bird_directory'] ?? '/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($editAsn['defaults']['bird_socket'] ?? '/run/bird/bird.ctl') ?>">
                    </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="cache_directory">Cache Directory</label>
                        <input type="text" 
                               id="cache_directory" 
                               name="cache_directory" 
                               class="form-control" 
                               value="<?= e($editAsn['defaults']['cache_directory'] ?? '/var/cache/pathvector') ?>">
                    </div>
                    
                    <div class="form-group flex-1" style="min-width: 200px;">
                        <label class="form-label" for="bgpq_path">BGPQ4 Path</label>
                        <input type="text" 
                               id="bgpq_path" 
                               name="bgpq_path" 
                               class="form-control" 
                               value="<?= e($editAsn['defaults']['bgpq_path'] ?? 'bgpq4') ?>">
                    </div>
                </div>
            </div>
        </div>
        
        <div class="Box mb-4">
            <div class="Box-header">
                <h3 class="Box-title">Advanced Options</h3>
            </div>
            <div class="Box-body">
                <div class="d-flex flex-wrap" style="gap: 24px;">
                    <div class="form-checkbox">
                        <label>
                            <input type="checkbox" 
                                   name="merge_paths" 
                                   value="1"
                                   <?= ($editAsn['defaults']['merge_paths'] ?? false) ? 'checked' : '' ?>>
                            Enable merge paths (ADD-PATH)
                        </label>
                    </div>
                    
                    <div class="form-checkbox">
                        <label>
                            <input type="checkbox" 
                                   name="transit_locking" 
                                   value="1"
                                   <?= ($editAsn['defaults']['transit_locking'] ?? false) ? 'checked' : '' ?>>
                            Enable transit locking
                        </label>
                    </div>
                    
                    <div class="form-checkbox">
                        <label>
                            <input type="checkbox" 
                                   name="graceful_shutdown" 
                                   value="1"
                                   <?= ($editAsn['defaults']['graceful_shutdown'] ?? false) ? 'checked' : '' ?>>
                            Enable graceful shutdown
                        </label>
                    </div>
                    
                    <div class="form-checkbox">
                        <label>
                            <input type="checkbox" 
                                   name="no_announce" 
                                   value="1"
                                   <?= ($editAsn['defaults']['no_announce'] ?? false) ? 'checked' : '' ?>>
                            No announce (disable route announcements)
                        </label>
                    </div>
                </div>
            </div>
        </div>
        
        <div class="d-flex flex-items-center" style="gap: 8px;">
            <button type="submit" class="btn btn-primary">
                <?= $action === 'edit' ? 'Update ASN' : 'Create ASN' ?>
            </button>
            <a href="?page=asns" class="btn">Cancel</a>
        </div>
    </form>
</div>
<?php endif; ?>