<?php
/* Copyright (C) 2026 Alles Watt lauft
 *
 * PWA API - AJAX Endpoints für die mobile App
 * Token-basierte Authentifizierung
 */

if (!defined('NOLOGIN')) {
	define('NOLOGIN', '1');
}
if (!defined('NOREQUIREMENU')) {
	define('NOREQUIREMENU', '1');
}
if (!defined('NOREQUIREHTML')) {
	define('NOREQUIREHTML', '1');
}
if (!defined('NOREQUIREAJAX')) {
	define('NOREQUIREAJAX', '1');
}

// Load Dolibarr environment
$res = 0;
if (!$res && file_exists("../../main.inc.php")) {
	$res = @include "../../main.inc.php";
}
if (!$res && file_exists("../../../main.inc.php")) {
	$res = @include "../../../main.inc.php";
}
if (!$res) {
	die(json_encode(array('success' => false, 'error' => 'Dolibarr not loaded')));
}

header('Content-Type: application/json; charset=UTF-8');

$response = array('success' => false);

// Verify token
$token = GETPOST('token', 'none');
if (empty($token)) {
	echo json_encode(array('success' => false, 'error' => 'Nicht authentifiziert'));
	exit;
}

$tokenData = json_decode(base64_decode($token), true);
if (!$tokenData || empty($tokenData['user_id']) || empty($tokenData['expires']) || $tokenData['expires'] < time()) {
	echo json_encode(array('success' => false, 'error' => 'Token ungültig oder abgelaufen'));
	exit;
}

// Verify hash
$expectedHash = md5($tokenData['user_id'] . $tokenData['login'] . getDolGlobalString('MAIN_SECURITY_SALT', 'defaultsalt'));
if ($tokenData['hash'] !== $expectedHash) {
	echo json_encode(array('success' => false, 'error' => 'Token manipuliert'));
	exit;
}

// Load user
require_once DOL_DOCUMENT_ROOT.'/user/class/user.class.php';
$user = new User($db);
$user->fetch($tokenData['user_id']);
$user->getrights();

if ($user->id <= 0 || $user->statut != 1) {
	echo json_encode(array('success' => false, 'error' => 'Benutzer nicht mehr aktiv'));
	exit;
}

// Check permission
if (!$user->hasRight('kundenkarte', 'read')) {
	echo json_encode(array('success' => false, 'error' => 'Keine Berechtigung'));
	exit;
}

// Load required classes
require_once DOL_DOCUMENT_ROOT.'/custom/kundenkarte/class/anlage.class.php';
require_once DOL_DOCUMENT_ROOT.'/custom/kundenkarte/class/equipmentpanel.class.php';
require_once DOL_DOCUMENT_ROOT.'/custom/kundenkarte/class/equipmentcarrier.class.php';
require_once DOL_DOCUMENT_ROOT.'/custom/kundenkarte/class/equipment.class.php';
require_once DOL_DOCUMENT_ROOT.'/custom/kundenkarte/class/equipmenttype.class.php';
require_once DOL_DOCUMENT_ROOT.'/custom/kundenkarte/class/equipmentconnection.class.php';
require_once DOL_DOCUMENT_ROOT.'/custom/kundenkarte/class/mediumtype.class.php';

$action = GETPOST('action', 'aZ09');

switch ($action) {
	// ============================================
	// CUSTOMER SEARCH
	// ============================================
	case 'search_customers':
		$query = GETPOST('query', 'alphanohtml');
		if (strlen($query) < 2) {
			$response['error'] = 'Mindestens 2 Zeichen';
			break;
		}

		$sql = "SELECT s.rowid, s.nom as name, s.town";
		$sql .= " FROM ".MAIN_DB_PREFIX."societe as s";
		$sql .= " WHERE s.entity IN (".getEntity('societe').")";
		$sql .= " AND s.status = 1";
		$sql .= " AND (s.nom LIKE '%".$db->escape($query)."%'";
		$sql .= " OR s.name_alias LIKE '%".$db->escape($query)."%')";
		$sql .= " ORDER BY s.nom ASC";
		$sql .= " LIMIT 30";

		$resql = $db->query($sql);
		$customers = array();

		if ($resql) {
			while ($obj = $db->fetch_object($resql)) {
				$customers[] = array(
					'id' => $obj->rowid,
					'name' => $obj->name,
					'town' => $obj->town
				);
			}
		}

		$response['success'] = true;
		$response['customers'] = $customers;
		break;

	// ============================================
	// GET ANLAGEN FOR CUSTOMER (inkl. Kontakt-Adressen)
	// ============================================
	case 'get_anlagen':
		$customerId = GETPOSTINT('customer_id');
		if ($customerId <= 0) {
			$response['error'] = 'Keine Kunden-ID';
			break;
		}

		// Feld-Metadaten laden (show_in_tree Felder für Anzeige)
		$fieldMeta = array();
		$sqlFields = "SELECT fk_anlage_type, field_code, field_label, tree_display_mode, badge_color, show_in_tree, field_type";
		$sqlFields .= " FROM ".MAIN_DB_PREFIX."kundenkarte_anlage_type_field";
		$sqlFields .= " WHERE active = 1 AND show_in_tree = 1";
		$sqlFields .= " ORDER BY position";
		$resFields = $db->query($sqlFields);
		if ($resFields) {
			while ($fObj = $db->fetch_object($resFields)) {
				if ($fObj->field_type === 'header') continue;
				$fieldMeta[(int)$fObj->fk_anlage_type][$fObj->field_code] = array(
					'label' => $fObj->field_label,
					'display' => $fObj->tree_display_mode ?: 'badge',
					'color' => $fObj->badge_color ?: '',
				);
			}
			$db->free($resFields);
		}

		// Kompletter Baum ohne Kontaktzuweisung (Kunden-Ebene)
		$anlage = new Anlage($db);
		$tree = $anlage->fetchTree($customerId, 0);
		$result = pwaTreeToArray($tree, $fieldMeta);

		// Kontakt-Adressen mit Anlagen laden
		$contacts = array();
		$sql = "SELECT c.rowid, c.lastname, c.firstname, c.address, c.town,";
		$sql .= " (SELECT COUNT(*) FROM ".MAIN_DB_PREFIX."kundenkarte_anlage a WHERE a.fk_contact = c.rowid AND a.status = 1) as anlage_count";
		$sql .= " FROM ".MAIN_DB_PREFIX."socpeople as c";
		$sql .= " WHERE c.fk_soc = ".((int) $customerId);
		$sql .= " AND c.statut = 1";
		$sql .= " ORDER BY c.lastname ASC";

		$resql = $db->query($sql);
		if ($resql) {
			while ($obj = $db->fetch_object($resql)) {
				$contactName = trim($obj->lastname.' '.$obj->firstname);
				$contacts[] = array(
					'id' => $obj->rowid,
					'name' => $contactName,
					'address' => $obj->address,
					'town' => $obj->town,
					'anlage_count' => (int) $obj->anlage_count
				);
			}
		}

		$response['success'] = true;
		$response['anlagen'] = $result;
		$response['contacts'] = $contacts;
		break;

	// ============================================
	// GET ANLAGEN FOR CONTACT ADDRESS
	// ============================================
	case 'get_contact_anlagen':
		$customerId = GETPOSTINT('customer_id');
		$contactId = GETPOSTINT('contact_id');
		if ($customerId <= 0 || $contactId <= 0) {
			$response['error'] = 'Kunden-ID und Kontakt-ID erforderlich';
			break;
		}

		// Feld-Metadaten laden falls nicht schon vorhanden
		if (!isset($fieldMeta)) {
			$fieldMeta = array();
			$sqlFields = "SELECT fk_anlage_type, field_code, field_label, tree_display_mode, badge_color, show_in_tree, field_type";
			$sqlFields .= " FROM ".MAIN_DB_PREFIX."kundenkarte_anlage_type_field";
			$sqlFields .= " WHERE active = 1 AND show_in_tree = 1";
			$sqlFields .= " ORDER BY position";
			$resFields = $db->query($sqlFields);
			if ($resFields) {
				while ($fObj = $db->fetch_object($resFields)) {
					if ($fObj->field_type === 'header') continue;
					$fieldMeta[(int)$fObj->fk_anlage_type][$fObj->field_code] = array(
						'label' => $fObj->field_label,
						'display' => $fObj->tree_display_mode ?: 'badge',
						'color' => $fObj->badge_color ?: '',
					);
				}
				$db->free($resFields);
			}
		}

		$anlage = new Anlage($db);
		$tree = $anlage->fetchTreeByContact($customerId, $contactId, 0);
		$result = pwaTreeToArray($tree, $fieldMeta);

		$response['success'] = true;
		$response['anlagen'] = $result;
		break;

	// ============================================
	// GET ANLAGE DATA (Panels, Carriers, Equipment)
	// ============================================
	case 'get_anlage_data':
		$anlageId = GETPOSTINT('anlage_id');
		if ($anlageId <= 0) {
			$response['error'] = 'Keine Anlagen-ID';
			break;
		}

		// Load panels
		$panel = new EquipmentPanel($db);
		$panels = $panel->fetchByAnlage($anlageId);
		$panelsData = array();
		foreach ($panels as $p) {
			$panelsData[] = array(
				'id' => $p->id,
				'label' => $p->label,
				'position' => $p->position
			);
		}

		// Load carriers
		$carrier = new EquipmentCarrier($db);
		$carriersData = array();
		foreach ($panels as $p) {
			$p->fetchCarriers();
			foreach ($p->carriers as $c) {
				$carriersData[] = array(
					'id' => $c->id,
					'fk_panel' => $c->fk_panel,
					'label' => $c->label,
					'total_te' => $c->total_te,
					'position' => $c->position
				);
			}
		}

		// Load equipment
		$equipment = new Equipment($db);
		$equipmentData = array();
		foreach ($carriersData as $c) {
			$items = $equipment->fetchByCarrier($c['id']);
			foreach ($items as $eq) {
				$equipmentData[] = array(
					'id' => $eq->id,
					'fk_carrier' => $eq->fk_carrier,
					'fk_equipment_type' => $eq->fk_equipment_type,
					'label' => $eq->label,
					'position_te' => $eq->position_te,
					'width_te' => $eq->width_te,
					'block_label' => $eq->getBlockLabel(),
					'block_color' => $eq->getBlockColor(),
					'field_values' => $eq->getFieldValues()
				);
			}
		}

		// Equipment-Typen laden (benötigt für Terminal-Position-Auflösung)
		$eqType = new EquipmentType($db);
		$types = $eqType->fetchAllBySystem(1, 1); // System 1 = Elektro, nur aktive

		// Abgänge laden (Connections mit fk_target IS NULL = Ausgänge)
		$outputsData = array();
		if (!empty($equipmentData)) {
			$equipmentIds = array_map(function($e) { return (int) $e['id']; }, $equipmentData);
			$sql = "SELECT rowid, fk_source, output_label, medium_type, medium_spec, medium_length, connection_type, color, source_terminal, source_terminal_id";
			$sql .= " FROM ".MAIN_DB_PREFIX."kundenkarte_equipment_connection";
			$sql .= " WHERE fk_source IN (".implode(',', $equipmentIds).")";
			$sql .= " AND fk_target IS NULL";
			$sql .= " AND status = 1";
			$resql = $db->query($sql);
			if ($resql) {
				while ($obj = $db->fetch_object($resql)) {
					// Position bestimmen wie Website: source_terminal_id → Terminal-Config
					$isTop = false;
					if ($obj->source_terminal === 'top') {
						// PWA-erstellte Verbindung mit expliziter Top-Angabe
						$isTop = true;
					} elseif (!empty($obj->source_terminal_id)) {
						// Website-erstellte Verbindung: Terminal-Position aus Equipment-Typ ermitteln
						$termId = $obj->source_terminal_id;
						$eqTypeId = null;
						foreach ($equipmentData as $e) {
							if ($e['id'] == $obj->fk_source) {
								$eqTypeId = $e['fk_equipment_type'];
								break;
							}
						}
						if ($eqTypeId) {
							// Terminal-Config des Typs prüfen
							$termResolved = false;
							foreach ($types as $t) {
								if ($t->id == $eqTypeId && !empty($t->terminals_config)) {
									$config = json_decode($t->terminals_config, true);
									$terms = $config['terminals'] ?? ($config['inputs'] ?? []);
									if (!empty($config['terminals'])) {
										foreach ($config['terminals'] as $term) {
											if ($term['id'] === $termId) {
												$isTop = ($term['pos'] === 'top');
												$termResolved = true;
												break;
											}
										}
									}
									break;
								}
							}
							// Fallback: t1=oben, t2=unten (Standard LS)
							if (!$termResolved) {
								$isTop = ($termId === 't1');
							}
						}
					}

					$outputsData[] = array(
						'id' => $obj->rowid,
						'fk_source' => $obj->fk_source,
						'output_label' => $obj->output_label,
						'medium_type' => $obj->medium_type,
						'medium_spec' => $obj->medium_spec,
						'medium_length' => $obj->medium_length,
						'connection_type' => $obj->connection_type,
						'color' => $obj->color,
						'source_terminal_id' => $obj->source_terminal_id ?: '',
						'is_top' => $isTop
					);
				}
			}
		}

		// Einspeisungen laden (Connections mit fk_source IS NULL = Inputs)
		$inputsData = array();
		if (!empty($equipmentData)) {
			$sql = "SELECT rowid, fk_target, output_label, connection_type, color";
			$sql .= " FROM ".MAIN_DB_PREFIX."kundenkarte_equipment_connection";
			$sql .= " WHERE fk_target IN (".implode(',', $equipmentIds).")";
			$sql .= " AND fk_source IS NULL";
			$sql .= " AND status = 1";
			$resql = $db->query($sql);
			if ($resql) {
				while ($obj = $db->fetch_object($resql)) {
					$inputsData[] = array(
						'id' => $obj->rowid,
						'fk_target' => $obj->fk_target,
						'output_label' => $obj->output_label,
						'connection_type' => $obj->connection_type,
						'color' => $obj->color
					);
				}
			}
		}

		// Equipment-Typen für Response aufbereiten (bereits oben geladen)
		$typesData = array();
		foreach ($types as $t) {
			$typesData[] = array(
				'id' => $t->id,
				'ref' => $t->ref,
				'label' => $t->label,
				'label_short' => $t->label_short,
				'width_te' => $t->width_te,
				'color' => $t->color
			);
		}

		$response['success'] = true;
		$response['panels'] = $panelsData;
		$response['carriers'] = $carriersData;
		$response['equipment'] = $equipmentData;
		$response['outputs'] = $outputsData;
		$response['inputs'] = $inputsData;
		$response['types'] = $typesData;
		break;

	// ============================================
	// CREATE PANEL
	// ============================================
	case 'create_panel':
		if (!$user->hasRight('kundenkarte', 'write')) {
			$response['error'] = 'Keine Schreibberechtigung';
			break;
		}

		$anlageId = GETPOSTINT('anlage_id');
		$label = GETPOST('label', 'alphanohtml');

		if ($anlageId <= 0) {
			$response['error'] = 'Keine Anlagen-ID';
			break;
		}

		$panel = new EquipmentPanel($db);
		$panel->fk_anlage = $anlageId;
		$panel->label = $label ?: 'Feld';

		$result = $panel->create($user);
		if ($result > 0) {
			$response['success'] = true;
			$response['panel_id'] = $result;
		} else {
			$response['error'] = $panel->error ?: 'Fehler beim Anlegen';
		}
		break;

	// ============================================
	// CREATE CARRIER
	// ============================================
	case 'create_carrier':
		if (!$user->hasRight('kundenkarte', 'write')) {
			$response['error'] = 'Keine Schreibberechtigung';
			break;
		}

		$panelId = GETPOSTINT('panel_id');
		$totalTe = GETPOSTINT('total_te') ?: 12;
		$label = GETPOST('label', 'alphanohtml');

		if ($panelId <= 0) {
			$response['error'] = 'Keine Panel-ID';
			break;
		}

		// Anlage-ID vom Panel holen (benötigt für Carrier-Erstellung)
		$panelObj = new EquipmentPanel($db);
		if ($panelObj->fetch($panelId) <= 0) {
			$response['error'] = 'Panel nicht gefunden';
			break;
		}

		$carrier = new EquipmentCarrier($db);
		$carrier->fk_anlage = $panelObj->fk_anlage;
		$carrier->fk_panel = $panelId;
		$carrier->label = $label ?: 'Hutschiene';
		$carrier->total_te = $totalTe;

		$result = $carrier->create($user);
		if ($result > 0) {
			$response['success'] = true;
			$response['carrier_id'] = $result;
		} else {
			$response['error'] = $carrier->error ?: 'Fehler beim Anlegen';
		}
		break;

	// ============================================
	// UPDATE CARRIER
	// ============================================
	case 'update_carrier':
		if (!$user->hasRight('kundenkarte', 'write')) {
			$response['error'] = 'Keine Schreibberechtigung';
			break;
		}

		$carrierId = GETPOSTINT('carrier_id');
		if ($carrierId <= 0) {
			$response['error'] = 'Keine Carrier-ID';
			break;
		}

		$carrier = new EquipmentCarrier($db);
		if ($carrier->fetch($carrierId) <= 0) {
			$response['error'] = 'Hutschiene nicht gefunden';
			break;
		}

		$carrier->label = GETPOST('label', 'alphanohtml') ?: $carrier->label;
		$newTe = GETPOSTINT('total_te');
		if ($newTe > 0) {
			$carrier->total_te = $newTe;
		}

		$result = $carrier->update($user);
		if ($result > 0) {
			$response['success'] = true;
		} else {
			$response['error'] = $carrier->error ?: 'Fehler beim Aktualisieren';
		}
		break;

	// ============================================
	// DELETE CARRIER
	// ============================================
	case 'delete_carrier':
		if (!$user->hasRight('kundenkarte', 'write')) {
			$response['error'] = 'Keine Schreibberechtigung';
			break;
		}

		$carrierId = GETPOSTINT('carrier_id');
		if ($carrierId <= 0) {
			$response['error'] = 'Keine Carrier-ID';
			break;
		}

		$carrier = new EquipmentCarrier($db);
		if ($carrier->fetch($carrierId) <= 0) {
			$response['error'] = 'Hutschiene nicht gefunden';
			break;
		}

		$result = $carrier->delete($user);
		if ($result > 0) {
			$response['success'] = true;
		} else {
			$response['error'] = $carrier->error ?: 'Fehler beim Löschen';
		}
		break;

	// ============================================
	// CREATE EQUIPMENT
	// ============================================
	case 'create_equipment':
		if (!$user->hasRight('kundenkarte', 'write')) {
			$response['error'] = 'Keine Schreibberechtigung';
			break;
		}

		$carrierId = GETPOSTINT('carrier_id');
		$typeId = GETPOSTINT('type_id');
		$label = GETPOST('label', 'alphanohtml');
		$positionTe = GETPOSTINT('position_te') ?: 1;
		$fieldValues = GETPOST('field_values', 'nohtml');

		if ($carrierId <= 0 || $typeId <= 0) {
			$response['error'] = 'Carrier-ID und Typ-ID erforderlich';
			break;
		}

		// Load type for width
		$eqType = new EquipmentType($db);
		$eqType->fetch($typeId);

		$equipment = new Equipment($db);
		$equipment->fk_carrier = $carrierId;
		$equipment->fk_equipment_type = $typeId;
		$equipment->label = $label;
		$equipment->position_te = $positionTe;
		$equipment->width_te = $eqType->width_te ?: 1;
		$equipment->field_values = $fieldValues;

		// Bezeichnung automatisch generieren wenn leer (wie Website)
		if (empty(trim($equipment->label ?? ''))) {
			$carrier = new EquipmentCarrier($db);
			if ($carrier->fetch($carrierId) > 0) {
				$carrierLabel = $carrier->label ?: ('R'.$carrier->id);
				$posStart = $equipment->position_te;
				$posEnd = $posStart + $equipment->width_te - 1;
				if ($equipment->width_te > 1) {
					$equipment->label = $carrierLabel.'.'.$posStart.'-'.$posEnd;
				} else {
					$equipment->label = $carrierLabel.'.'.$posStart;
				}
			}
		}

		$result = $equipment->create($user);
		if ($result > 0) {
			$response['success'] = true;
			$response['equipment_id'] = $result;
			$response['label'] = $equipment->label;
			$response['block_label'] = $equipment->getBlockLabel();
			$response['block_color'] = $equipment->getBlockColor();
		} else {
			$response['error'] = $equipment->error ?: 'Fehler beim Anlegen';
		}
		break;

	// ============================================
	// GET TYPE FIELDS (Felder pro Equipment-Typ)
	// ============================================
	case 'get_type_fields':
		$typeId = GETPOSTINT('type_id');
		$equipmentId = GETPOSTINT('equipment_id');

		if ($typeId <= 0) {
			$response['error'] = 'Keine Typ-ID';
			break;
		}

		$type = new EquipmentType($db);
		if ($type->fetch($typeId) <= 0) {
			$response['error'] = 'Typ nicht gefunden';
			break;
		}

		$fields = $type->fetchFields(1);

		// Bestehende Werte laden (bei Bearbeitung)
		$existingValues = array();
		if ($equipmentId > 0) {
			$eq = new Equipment($db);
			if ($eq->fetch($equipmentId) > 0) {
				$existingValues = $eq->getFieldValues();
			}
		}

		$result = array();
		foreach ($fields as $field) {
			$value = isset($existingValues[$field->field_code]) ? $existingValues[$field->field_code] : $field->field_default;
			$result[] = array(
				'code' => $field->field_code,
				'label' => $field->field_label,
				'type' => $field->field_type,
				'options' => $field->field_options,
				'required' => (int) $field->required,
				'show_on_block' => (int) $field->show_on_block,
				'value' => $value
			);
		}

		$response['success'] = true;
		$response['fields'] = $result;
		break;

	// ============================================
	// UPDATE EQUIPMENT
	// ============================================
	case 'update_equipment':
		if (!$user->hasRight('kundenkarte', 'write')) {
			$response['error'] = 'Keine Schreibberechtigung';
			break;
		}

		$equipmentId = GETPOSTINT('equipment_id');
		$label = GETPOST('label', 'alphanohtml');
		$fieldValues = GETPOST('field_values', 'nohtml');

		if ($equipmentId <= 0) {
			$response['error'] = 'Keine Equipment-ID';
			break;
		}

		$equipment = new Equipment($db);
		if ($equipment->fetch($equipmentId) <= 0) {
			$response['error'] = 'Automat nicht gefunden';
			break;
		}

		$equipment->label = $label;
		$equipment->field_values = $fieldValues;

		$result = $equipment->update($user);
		if ($result > 0) {
			$response['success'] = true;
			// Aktualisierte Daten zurückgeben
			$response['block_label'] = $equipment->getBlockLabel();
			$response['block_color'] = $equipment->getBlockColor();
		} else {
			$response['error'] = $equipment->error ?: 'Fehler beim Aktualisieren';
		}
		break;

	// ============================================
	// DELETE EQUIPMENT
	// ============================================
	case 'delete_equipment':
		if (!$user->hasRight('kundenkarte', 'write')) {
			$response['error'] = 'Keine Schreibberechtigung';
			break;
		}

		$equipmentId = GETPOSTINT('equipment_id');

		if ($equipmentId <= 0) {
			$response['error'] = 'Keine Equipment-ID';
			break;
		}

		$equipment = new Equipment($db);
		if ($equipment->fetch($equipmentId) <= 0) {
			$response['error'] = 'Automat nicht gefunden';
			break;
		}

		$result = $equipment->delete($user);
		if ($result > 0) {
			$response['success'] = true;
		} else {
			$response['error'] = $equipment->error ?: 'Fehler beim Löschen';
		}
		break;

	// ============================================
	// CREATE CONNECTION (Abgang oder Einspeisung)
	// ============================================
	case 'create_connection':
		if (!$user->hasRight('kundenkarte', 'write')) {
			$response['error'] = 'Keine Schreibberechtigung';
			break;
		}

		$equipmentId = GETPOSTINT('equipment_id');
		$direction = GETPOST('direction', 'alpha'); // 'output' oder 'input'
		$connectionType = GETPOST('connection_type', 'alphanohtml');
		$outputLabel = GETPOST('output_label', 'alphanohtml');
		$mediumType = GETPOST('medium_type', 'alphanohtml');
		$mediumSpec = GETPOST('medium_spec', 'alphanohtml');
		$mediumLength = GETPOST('medium_length', 'alphanohtml');
		$sourceTerminal = GETPOST('source_terminal', 'alphanohtml') ?: 'output';
		$sourceTerminalId = GETPOST('source_terminal_id', 'alphanohtml');

		if ($equipmentId <= 0) {
			$response['error'] = 'Keine Equipment-ID';
			break;
		}

		// Equipment prüfen und Carrier-ID ermitteln
		$eq = new Equipment($db);
		if ($eq->fetch($equipmentId) <= 0) {
			$response['error'] = 'Automat nicht gefunden';
			break;
		}

		$conn = new EquipmentConnection($db);
		$conn->connection_type = $connectionType;
		$conn->color = GETPOST('color', 'alphanohtml');
		$conn->output_label = $outputLabel;
		$conn->fk_carrier = $eq->fk_carrier;

		if ($direction === 'input') {
			// Einspeisung: fk_source = NULL, fk_target = Equipment
			$conn->fk_target = $equipmentId;
			$conn->fk_source = null;
			$conn->target_terminal = 'input';
		} else {
			// Abgang: fk_source = Equipment, fk_target = NULL
			$conn->fk_source = $equipmentId;
			$conn->fk_target = null;
			$conn->source_terminal = $sourceTerminal;
			$conn->source_terminal_id = $sourceTerminalId ?: ($sourceTerminal === 'top' ? 't1' : 't2');
			$conn->medium_type = $mediumType;
			$conn->medium_spec = $mediumSpec;
			$conn->medium_length = $mediumLength;
		}

		$result = $conn->create($user);
		if ($result > 0) {
			$response['success'] = true;
			$response['connection_id'] = $result;
		} else {
			$response['error'] = $conn->error ?: 'Fehler beim Anlegen';
		}
		break;

	// ============================================
	// UPDATE CONNECTION
	// ============================================
	case 'update_connection':
		if (!$user->hasRight('kundenkarte', 'write')) {
			$response['error'] = 'Keine Schreibberechtigung';
			break;
		}

		$connectionId = GETPOSTINT('connection_id');
		if ($connectionId <= 0) {
			$response['error'] = 'Keine Verbindungs-ID';
			break;
		}

		$conn = new EquipmentConnection($db);
		if ($conn->fetch($connectionId) <= 0) {
			$response['error'] = 'Verbindung nicht gefunden';
			break;
		}

		$conn->connection_type = GETPOST('connection_type', 'alphanohtml');
		$conn->color = GETPOST('color', 'alphanohtml');
		$conn->output_label = GETPOST('output_label', 'alphanohtml');
		$conn->medium_type = GETPOST('medium_type', 'alphanohtml');
		$conn->medium_spec = GETPOST('medium_spec', 'alphanohtml');
		$conn->medium_length = GETPOST('medium_length', 'alphanohtml');
		if (GETPOSTISSET('source_terminal')) {
			$conn->source_terminal = GETPOST('source_terminal', 'alphanohtml') ?: $conn->source_terminal;
		}
		if (GETPOSTISSET('source_terminal_id')) {
			$conn->source_terminal_id = GETPOST('source_terminal_id', 'alphanohtml') ?: $conn->source_terminal_id;
		}

		$result = $conn->update($user);
		if ($result > 0) {
			$response['success'] = true;
		} else {
			$response['error'] = $conn->error ?: 'Fehler beim Aktualisieren';
		}
		break;

	// ============================================
	// DELETE CONNECTION
	// ============================================
	case 'delete_connection':
		if (!$user->hasRight('kundenkarte', 'write')) {
			$response['error'] = 'Keine Schreibberechtigung';
			break;
		}

		$connectionId = GETPOSTINT('connection_id');
		if ($connectionId <= 0) {
			$response['error'] = 'Keine Verbindungs-ID';
			break;
		}

		$conn = new EquipmentConnection($db);
		if ($conn->fetch($connectionId) <= 0) {
			$response['error'] = 'Verbindung nicht gefunden';
			break;
		}

		$result = $conn->delete($user);
		if ($result > 0) {
			$response['success'] = true;
		} else {
			$response['error'] = $conn->error ?: 'Fehler beim Löschen';
		}
		break;

	// ============================================
	// GET MEDIUM TYPES (Kabeltypen aus DB)
	// ============================================
	case 'get_medium_types':
		$mediumType = new MediumType($db);
		$grouped = $mediumType->fetchGroupedByCategory(1); // System 1 = Elektro

		$result = array();
		foreach ($grouped as $category => $types) {
			$catTypes = array();
			foreach ($types as $t) {
				$catTypes[] = array(
					'ref' => $t->ref,
					'label' => $t->label,
					'default_spec' => $t->default_spec,
					'available_specs' => $t->getAvailableSpecsArray(),
				);
			}
			$result[] = array(
				'category' => $category,
				'category_label' => $types[0]->getCategoryLabel(),
				'types' => $catTypes
			);
		}

		$response['success'] = true;
		$response['groups'] = $result;
		break;

	default:
		$response['error'] = 'Unbekannte Aktion: ' . $action;
}

echo json_encode($response);
$db->close();

/**
 * Feld-Badges für eine Anlage aufbereiten (show_in_tree Felder)
 *
 * @param Anlage $anlage Anlage-Objekt
 * @param array $fieldMeta Feld-Metadaten [typeId][code] = {label, display, color}
 * @return array Array von Feld-Objekten mit label, value, color
 */
function pwaGetAnlageFields($anlage, $fieldMeta) {
	$result = array();
	$values = $anlage->getFieldValues();
	if (empty($values)) return $result;

	$typeId = (int) $anlage->fk_anlage_type;
	$meta = isset($fieldMeta[$typeId]) ? $fieldMeta[$typeId] : array();
	if (empty($meta)) return $result;

	foreach ($meta as $code => $fm) {
		$val = isset($values[$code]) ? $values[$code] : null;
		if ($val === '' || $val === null) continue;

		$result[] = array(
			'label' => $fm['label'],
			'value' => $val,
			'color' => $fm['color'],
			'display' => $fm['display'],
		);
	}
	return $result;
}

/**
 * Anlagen-Baum rekursiv in JSON-Array umwandeln
 *
 * @param array $nodes Array von Anlage-Objekten mit ->children
 * @param array $fieldMeta Feld-Metadaten [typeId][code] = {label, display, color}
 * @return array JSON-serialisierbares Array mit children
 */
function pwaTreeToArray($nodes, $fieldMeta) {
	$result = array();
	foreach ($nodes as $node) {
		$item = array(
			'id' => $node->id,
			'label' => $node->label,
			'type' => $node->type_label,
			'can_have_equipment' => !empty($node->type_can_have_equipment),
			'can_have_children' => !empty($node->type_can_have_children),
		);

		// Feld-Badges
		$fields = pwaGetAnlageFields($node, $fieldMeta);
		if (!empty($fields)) {
			$item['fields'] = $fields;
		}

		// Kinder rekursiv
		if (!empty($node->children)) {
			$item['children'] = pwaTreeToArray($node->children, $fieldMeta);
		}

		$result[] = $item;
	}
	return $result;
}