<?php
/**
 * app/modules/connections/list.php
 *
 * Übersicht der Netzwerkverbindungen
 * - Tabellarische Liste aller Verbindungen
 * - Filter nach Geräten, VLANs, Status
 * - Später: Visuelle Netzwerk-Topologie
 */

// =========================
// Filter einlesen
// =========================
$search = trim($_GET['search'] ?? '');
$deviceId = (int)($_GET['device_id'] ?? 0);

// Einheitliche Endpunkt-Aufloesung fuer polymorphe Port-Typen.
$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(no.name, ' / ', IFNULL(r.name, ''), ' / ', IFNULL(f.name, '')) AS owner_name,
        NULL AS owner_device_id
    FROM network_outlet_ports nop
    JOIN network_outlets no ON no.id = nop.outlet_id
    LEFT JOIN rooms r ON r.id = no.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-Clause bauen
// =========================
$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) : "";

// =========================
// Verbindungen laden
// =========================
$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
);

// =========================
// Filter-Daten
// =========================
$devices = $sql->get("SELECT id, name FROM devices ORDER BY name", "", []);

$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);
    }
}

?>

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

    <!-- =========================
         Filter-Toolbar
         ========================= -->
    <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 Gerät oder Port…"
                value="<?php echo htmlspecialchars($search); ?>" class="search-input">

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

    <!-- =========================
         Verbindungs-Tabelle
         ========================= -->
    <?php if (!empty($connections)): ?>
    <table class="connections-list">
        <thead>
            <tr>
                <th>Von (Gerät → Port)</th>
                <th>Nach (Gerät → Port)</th>
                <th>VLANs</th>
                <th>Beschreibung</th>
                <th>Status</th>
                <th>Aktionen</th>
            </tr>
        </thead>
        <tbody>
            <?php foreach ($connections as $conn): ?>
            <?php
                $comment = trim($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);
                $hasWarning = $hasMissingInfo || $warningFromComment;
            ?>
            <tr>
                <td>
                    <strong><?php echo htmlspecialchars($conn['endpoint_a_name'] ?? 'N/A'); ?></strong><br>
                    <small><?php echo htmlspecialchars($conn['port_a_name'] ?? '—'); ?></small>
                </td>

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

                <td>
                    <small>
                        <?php
                            if ($conn['vlan_config']) {
                                $vlan = json_decode($conn['vlan_config'], true);
                                echo htmlspecialchars(implode(', ', (array)$vlan));
                            } else {
                                echo '—';
                            }
                        ?>
                    </small>
                </td>

                <td>
                    <small><?php echo htmlspecialchars($conn['comment'] ?? ''); ?></small>
                </td>
                <td class="status-cell">
                    <?php if ($hasWarning): ?>
                        <span class="status-badge status-badge-warning" title="Unvollständige oder kritische Verbindung">
                            ⚠️ Warnung
                        </span>
                    <?php else: ?>
                        <span class="status-badge status-badge-ok" title="Verbindung vollständig">
                            ✔️ OK
                        </span>
                    <?php endif; ?>
                </td>

                <td class="actions">
                    <a href="?module=connections&action=edit&id=<?php echo $conn['id']; ?>" class="button button-small">Bearbeiten</a>
                    <a href="#" class="button button-small button-danger"
                        data-confirm-delete="true"
                        data-confirm-message="Diese Verbindung wirklich löschen?"
                        data-confirm-feedback="Löschen noch nicht implementiert">
                        Löschen
                    </a>
                </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>

<!-- =========================
     Sidebar / Details
     ========================= -->

<aside class="sidebar">
    <?php if ($selectedDevice): ?>
        <h3>Ausgewähltes Gerät</h3>
        <p><strong><?php echo htmlspecialchars($selectedDevice['name']); ?></strong></p>
        <p>Typ: <?php echo htmlspecialchars($selectedDevice['type_name'] ?? '—'); ?></p>
        <p>Ports: <?php echo (int)$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 $port): ?>
                    <li><?php echo htmlspecialchars($port['name']); ?></li>
                <?php endforeach; ?>
            </ul>
        <?php endif; ?>
    <?php else: ?>
        <p><em>Bitte ein Gerät im Filter auswählen.</em></p>
    <?php endif; ?>

    <!-- TODO: Verbindung bearbeiten / löschen -->
</aside>