<?php
/**
 * app/modules/connections/list.php
 *
 * Uebersicht der Netzwerkverbindungen
 */

$search = trim($_GET['search'] ?? '');
$deviceId = (int)($_GET['device_id'] ?? 0);
$selectedConnectionId = (int)($_GET['connection_id'] ?? 0);

$endpointUnionSql = "
    SELECT
        'device' AS endpoint_type,
        dp.id AS endpoint_id,
        dp.name AS port_name,
        d.name AS owner_name,
        d.id AS owner_device_id
    FROM device_ports dp
    JOIN devices d ON d.id = dp.device_id
    UNION ALL
    SELECT
        'module' AS endpoint_type,
        mp.id AS endpoint_id,
        mp.name AS port_name,
        CONCAT(IFNULL(MIN(d.name), 'Unzugeordnet'), ' / ', m.name) AS owner_name,
        MIN(d.id) AS owner_device_id
    FROM module_ports mp
    JOIN modules m ON m.id = mp.module_id
    LEFT JOIN device_port_modules dpm ON dpm.module_id = m.id
    LEFT JOIN device_ports dp ON dp.id = dpm.device_port_id
    LEFT JOIN devices d ON d.id = dp.device_id
    GROUP BY mp.id, mp.name, m.name
    UNION ALL
    SELECT
        'outlet' AS endpoint_type,
        nop.id AS endpoint_id,
        nop.name AS port_name,
        CONCAT(o.name, ' / ', IFNULL(r.name, ''), ' / ', IFNULL(f.name, '')) AS owner_name,
        NULL AS owner_device_id
    FROM network_outlet_ports nop
    JOIN network_outlets o ON o.id = nop.outlet_id
    LEFT JOIN rooms r ON r.id = o.room_id
    LEFT JOIN floors f ON f.id = r.floor_id
    UNION ALL
    SELECT
        'floor_patchpanel' AS endpoint_type,
        fpp.id AS endpoint_id,
        fpp.name AS port_name,
        CONCAT(fp.name, ' / ', IFNULL(f.name, '')) AS owner_name,
        NULL AS owner_device_id
    FROM floor_patchpanel_ports fpp
    JOIN floor_patchpanels fp ON fp.id = fpp.patchpanel_id
    LEFT JOIN floors f ON f.id = fp.floor_id
";

$where = [];
$types = '';
$params = [];

if ($search !== '') {
    $where[] = "(e1.owner_name LIKE ? OR e2.owner_name LIKE ? OR e1.port_name LIKE ? OR e2.port_name LIKE ?)";
    $types .= 'ssss';
    $params[] = "%$search%";
    $params[] = "%$search%";
    $params[] = "%$search%";
    $params[] = "%$search%";
}

if ($deviceId > 0) {
    $where[] = "(e1.owner_device_id = ? OR e2.owner_device_id = ?)";
    $types .= 'ii';
    $params[] = $deviceId;
    $params[] = $deviceId;
}

$whereSql = $where ? 'WHERE ' . implode(' AND ', $where) : '';

$connections = $sql->get(
    "SELECT
        c.id,
        c.port_a_type, c.port_a_id, c.port_b_type, c.port_b_id,
        e1.owner_name AS endpoint_a_name,
        e2.owner_name AS endpoint_b_name,
        e1.port_name AS port_a_name,
        e2.port_name AS port_b_name,
        c.vlan_config,
        c.comment
    FROM connections c
    LEFT JOIN ($endpointUnionSql) e1
        ON c.port_a_id = e1.endpoint_id
       AND (
           c.port_a_type = e1.endpoint_type
           OR (c.port_a_type = 'device_ports' AND e1.endpoint_type = 'device')
           OR (c.port_a_type = 'module_ports' AND e1.endpoint_type = 'module')
           OR (c.port_a_type = 'network_outlet_ports' AND e1.endpoint_type = 'outlet')
           OR (c.port_a_type = 'floor_patchpanel_ports' AND e1.endpoint_type = 'floor_patchpanel')
           OR (c.port_a_type = 'patchpanel' AND e1.endpoint_type = 'floor_patchpanel')
       )
    LEFT JOIN ($endpointUnionSql) e2
        ON c.port_b_id = e2.endpoint_id
       AND (
           c.port_b_type = e2.endpoint_type
           OR (c.port_b_type = 'device_ports' AND e2.endpoint_type = 'device')
           OR (c.port_b_type = 'module_ports' AND e2.endpoint_type = 'module')
           OR (c.port_b_type = 'network_outlet_ports' AND e2.endpoint_type = 'outlet')
           OR (c.port_b_type = 'floor_patchpanel_ports' AND e2.endpoint_type = 'floor_patchpanel')
           OR (c.port_b_type = 'patchpanel' AND e2.endpoint_type = 'floor_patchpanel')
       )
    $whereSql
    ORDER BY e1.owner_name, e2.owner_name",
    $types,
    $params
);

$devices = $sql->get('SELECT id, name FROM devices ORDER BY name', '', []);

$selectedConnection = null;
if ($selectedConnectionId > 0) {
    foreach ((array)$connections as $entry) {
        if ((int)($entry['id'] ?? 0) === $selectedConnectionId) {
            $selectedConnection = $entry;
            break;
        }
    }
}

if ($selectedConnection === null && !empty($connections)) {
    $selectedConnection = $connections[0];
    $selectedConnectionId = (int)($selectedConnection['id'] ?? 0);
}

$selectedDevice = null;
$selectedDevicePorts = [];
$selectedDeviceVlans = [];

if ($deviceId > 0) {
    $selectedDevice = $sql->single(
        "SELECT d.id, d.name, dt.name AS type_name
         FROM devices d
         LEFT JOIN device_types dt ON d.device_type_id = dt.id
         WHERE d.id = ?",
        'i',
        [$deviceId]
    );

    if ($selectedDevice) {
        $selectedDevice['port_count'] = (int)($sql->single(
            "SELECT COUNT(*) AS cnt
             FROM (
                 SELECT dp.id
                 FROM device_ports dp
                 WHERE dp.device_id = ?
                 UNION ALL
                 SELECT DISTINCT mp.id
                 FROM module_ports mp
                 JOIN modules m ON m.id = mp.module_id
                 JOIN device_port_modules dpm ON dpm.module_id = m.id
                 JOIN device_ports dp ON dp.id = dpm.device_port_id
                 WHERE dp.device_id = ?
             ) p",
            'ii',
            [$deviceId, $deviceId]
        )['cnt'] ?? 0);

        $selectedDevice['connection_count'] = (int)($sql->single(
            "SELECT COUNT(DISTINCT c.id) AS cnt
             FROM connections c
             LEFT JOIN ($endpointUnionSql) e1
                ON c.port_a_id = e1.endpoint_id
               AND (
                   c.port_a_type = e1.endpoint_type
                   OR (c.port_a_type = 'device_ports' AND e1.endpoint_type = 'device')
                   OR (c.port_a_type = 'module_ports' AND e1.endpoint_type = 'module')
                   OR (c.port_a_type = 'network_outlet_ports' AND e1.endpoint_type = 'outlet')
                   OR (c.port_a_type = 'floor_patchpanel_ports' AND e1.endpoint_type = 'floor_patchpanel')
                   OR (c.port_a_type = 'patchpanel' AND e1.endpoint_type = 'floor_patchpanel')
               )
             LEFT JOIN ($endpointUnionSql) e2
                ON c.port_b_id = e2.endpoint_id
               AND (
                   c.port_b_type = e2.endpoint_type
                   OR (c.port_b_type = 'device_ports' AND e2.endpoint_type = 'device')
                   OR (c.port_b_type = 'module_ports' AND e2.endpoint_type = 'module')
                   OR (c.port_b_type = 'network_outlet_ports' AND e2.endpoint_type = 'outlet')
                   OR (c.port_b_type = 'floor_patchpanel_ports' AND e2.endpoint_type = 'floor_patchpanel')
                   OR (c.port_b_type = 'patchpanel' AND e2.endpoint_type = 'floor_patchpanel')
               )
             WHERE e1.owner_device_id = ? OR e2.owner_device_id = ?",
            'ii',
            [$deviceId, $deviceId]
        )['cnt'] ?? 0);

        $selectedDevicePorts = $sql->get(
            "SELECT name, vlan_config
             FROM (
                 SELECT dp.name, dp.vlan_config, dp.id AS sort_id
                 FROM device_ports dp
                 WHERE dp.device_id = ?
                 UNION ALL
                 SELECT DISTINCT CONCAT(m.name, ' / ', mp.name) AS name, NULL AS vlan_config, (1000000 + mp.id) AS sort_id
                 FROM module_ports mp
                 JOIN modules m ON m.id = mp.module_id
                 JOIN device_port_modules dpm ON dpm.module_id = m.id
                 JOIN device_ports dp ON dp.id = dpm.device_port_id
                 WHERE dp.device_id = ?
             ) p
             ORDER BY sort_id
             LIMIT 12",
            'ii',
            [$deviceId, $deviceId]
        );

        foreach ($selectedDevicePorts as $port) {
            if (empty($port['vlan_config'])) {
                continue;
            }

            $vlans = json_decode($port['vlan_config'], true);
            foreach ((array)$vlans as $vlan) {
                $vlan = trim((string)$vlan);
                if ($vlan !== '') {
                    $selectedDeviceVlans[$vlan] = true;
                }
            }
        }

        $selectedDeviceVlans = array_keys($selectedDeviceVlans);
        natcasesort($selectedDeviceVlans);
    }
}

$buildListUrl = static function (array $extra = []) use ($search, $deviceId): string {
    $query = ['module' => 'connections', 'action' => 'list'];
    if ($search !== '') {
        $query['search'] = $search;
    }
    if ($deviceId > 0) {
        $query['device_id'] = $deviceId;
    }
    foreach ($extra as $key => $value) {
        if ($value === null || $value === '') {
            continue;
        }
        $query[$key] = $value;
    }
    return '?' . http_build_query($query);
};
?>

<div class="connections-layout">
    <div class="connections-container">
        <h1>Netzwerkverbindungen</h1>

        <div class="filter-form">
            <form method="GET">
                <input type="hidden" name="module" value="connections">
                <input type="hidden" name="action" value="list">

                <input type="text" name="search" placeholder="Suche nach Geraet oder Port..."
                    value="<?php echo htmlspecialchars($search); ?>" class="search-input">

                <select name="device_id">
                    <option value="">- Alle Geraete -</option>
                    <?php foreach ($devices as $device): ?>
                    <option value="<?php echo (int)$device['id']; ?>"
                        <?php echo ((int)$device['id'] === $deviceId) ? 'selected' : ''; ?>>
                        <?php echo htmlspecialchars((string)$device['name']); ?>
                    </option>
                    <?php endforeach; ?>
                </select>

                <button type="submit" class="button">Filter</button>
                <a href="?module=connections&action=list" class="button">Reset</a>
                <a href="?module=connections&action=edit" class="button button-primary">+ Neue Verbindung</a>
            </form>
        </div>

        <?php if (!empty($connections)): ?>
        <table class="connections-list">
            <thead>
                <tr>
                    <th>Von (Geraet -> Port)</th>
                    <th>Nach (Geraet -> Port)</th>
                    <th>VLANs</th>
                    <th>Beschreibung</th>
                    <th>Status</th>
                    <th>Aktionen</th>
                </tr>
            </thead>
            <tbody>
                <?php foreach ($connections as $conn): ?>
                <?php
                    $connId = (int)($conn['id'] ?? 0);
                    $comment = trim((string)($conn['comment'] ?? ''));
                    $hasMissingInfo = empty($conn['endpoint_a_name']) || empty($conn['endpoint_b_name'])
                        || empty($conn['port_a_name']) || empty($conn['port_b_name']);
                    $commentLower = mb_strtolower($comment, 'UTF-8');
                    $warningFromComment = preg_match('/warn|achtung|critical/', $commentLower) === 1;
                    $hasWarning = $hasMissingInfo || $warningFromComment;
                    $rowClass = $connId === $selectedConnectionId ? 'connection-row-selected' : '';
                    $vlanList = [];
                    if (!empty($conn['vlan_config'])) {
                        $vlanList = (array)json_decode((string)$conn['vlan_config'], true);
                    }
                ?>
                <tr class="<?php echo $rowClass; ?>">
                    <td>
                        <strong><?php echo htmlspecialchars((string)($conn['endpoint_a_name'] ?? 'N/A')); ?></strong><br>
                        <small><?php echo htmlspecialchars((string)($conn['port_a_name'] ?? '-')); ?></small>
                    </td>

                    <td>
                        <strong><?php echo htmlspecialchars((string)($conn['endpoint_b_name'] ?? 'N/A')); ?></strong><br>
                        <small><?php echo htmlspecialchars((string)($conn['port_b_name'] ?? '-')); ?></small>
                    </td>

                    <td>
                        <small><?php echo !empty($vlanList) ? htmlspecialchars(implode(', ', $vlanList)) : '-'; ?></small>
                    </td>

                    <td>
                        <small><?php echo htmlspecialchars($comment); ?></small>
                    </td>

                    <td class="status-cell">
                        <?php if ($hasWarning): ?>
                            <span class="status-badge status-badge-warning" title="Unvollstaendige oder kritische Verbindung">Warnung</span>
                        <?php else: ?>
                            <span class="status-badge status-badge-ok" title="Verbindung vollstaendig">OK</span>
                        <?php endif; ?>
                    </td>

                    <td class="actions">
                        <a href="<?php echo htmlspecialchars($buildListUrl(['connection_id' => $connId])); ?>" class="button button-small">Details</a>
                        <a href="?module=connections&action=edit&id=<?php echo $connId; ?>" class="button button-small">Bearbeiten</a>
                        <a href="?module=connections&action=swap&id=<?php echo $connId; ?>" class="button button-small" onclick="return confirm('Von/Nach fuer diese Verbindung vertauschen?');">Von/Nach tauschen</a>
                        <button
                            type="button"
                            class="button button-small button-danger js-connection-delete"
                            data-connection-id="<?php echo $connId; ?>">
                            Loeschen
                        </button>
                    </td>
                </tr>
                <?php endforeach; ?>
            </tbody>
        </table>
        <?php else: ?>
        <div class="empty-state">
            <p>Keine Verbindungen gefunden.</p>
            <p>
                <a href="?module=connections&action=edit" class="button button-primary">
                    Erste Verbindung anlegen
                </a>
            </p>
        </div>
        <?php endif; ?>
    </div>

    <aside class="connections-sidebar">
        <section class="sidebar-card">
            <h3>Ausgewaehlte Verbindung</h3>
            <?php if ($selectedConnection): ?>
                <?php
                    $selectedConnId = (int)($selectedConnection['id'] ?? 0);
                    $selectedVlans = [];
                    if (!empty($selectedConnection['vlan_config'])) {
                        $selectedVlans = (array)json_decode((string)$selectedConnection['vlan_config'], true);
                    }
                ?>
                <p><strong>ID:</strong> #<?php echo $selectedConnId; ?></p>
                <p><strong>Von:</strong><br>
                    <?php echo htmlspecialchars((string)($selectedConnection['endpoint_a_name'] ?? 'N/A')); ?><br>
                    <small><?php echo htmlspecialchars((string)($selectedConnection['port_a_name'] ?? '-')); ?></small>
                </p>
                <p><strong>Nach:</strong><br>
                    <?php echo htmlspecialchars((string)($selectedConnection['endpoint_b_name'] ?? 'N/A')); ?><br>
                    <small><?php echo htmlspecialchars((string)($selectedConnection['port_b_name'] ?? '-')); ?></small>
                </p>
                <p><strong>VLANs:</strong> <?php echo !empty($selectedVlans) ? htmlspecialchars(implode(', ', $selectedVlans)) : '-'; ?></p>
                <p><strong>Kommentar:</strong> <?php echo htmlspecialchars((string)($selectedConnection['comment'] ?? '-')); ?></p>
                <div class="sidebar-actions">
                    <a href="?module=connections&action=edit&id=<?php echo $selectedConnId; ?>" class="button button-small">Bearbeiten</a>
                    <a href="?module=connections&action=swap&id=<?php echo $selectedConnId; ?>" class="button button-small" onclick="return confirm('Von/Nach fuer diese Verbindung vertauschen?');">Tauschen</a>
                    <button
                        type="button"
                        class="button button-small button-danger js-connection-delete"
                        data-connection-id="<?php echo $selectedConnId; ?>">
                        Loeschen
                    </button>
                </div>
            <?php else: ?>
                <p><em>Keine Verbindung ausgewaehlt.</em></p>
            <?php endif; ?>
        </section>

        <section class="sidebar-card">
            <?php if ($selectedDevice): ?>
                <h3>Ausgewaehltes Geraet</h3>
                <p><strong><?php echo htmlspecialchars((string)$selectedDevice['name']); ?></strong></p>
                <p>Typ: <?php echo htmlspecialchars((string)($selectedDevice['type_name'] ?? '-')); ?></p>
                <p>Ports: <?php echo (int)$selectedDevice['port_count']; ?></p>
                <p>Verbindungen: <?php echo (int)$selectedDevice['connection_count']; ?></p>
                <p>
                    VLANs:
                    <?php if (!empty($selectedDeviceVlans)): ?>
                        <?php echo htmlspecialchars(implode(', ', $selectedDeviceVlans)); ?>
                    <?php else: ?>
                        -
                    <?php endif; ?>
                </p>
                <?php if (!empty($selectedDevicePorts)): ?>
                    <h4>Ports (max. 12)</h4>
                    <ul>
                        <?php foreach ($selectedDevicePorts as $port): ?>
                            <li><?php echo htmlspecialchars((string)$port['name']); ?></li>
                        <?php endforeach; ?>
                    </ul>
                <?php endif; ?>
            <?php else: ?>
                <h3>Ausgewaehltes Geraet</h3>
                <p><em>Bitte ein Geraet im Filter auswaehlen.</em></p>
            <?php endif; ?>
        </section>
    </aside>
</div>

<script>
document.addEventListener('DOMContentLoaded', () => {
    document.querySelectorAll('.js-connection-delete').forEach((button) => {
        button.addEventListener('click', () => {
            const id = Number(button.dataset.connectionId || '0');
            if (id <= 0) {
                return;
            }

            if (!confirm('Diese Verbindung wirklich loeschen?')) {
                return;
            }

            fetch('?module=connections&action=delete', {
                method: 'POST',
                headers: { 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8' },
                body: 'id=' + encodeURIComponent(id)
            })
                .then((response) => response.json())
                .then((data) => {
                    if (data && data.success) {
                        window.location.reload();
                        return;
                    }
                    alert((data && data.message) ? data.message : 'Loeschen fehlgeschlagen');
                })
                .catch(() => alert('Loeschen fehlgeschlagen'));
        });
    });
});
</script>