<?php
/**
 * Airline Tycoon - Airports API
 * Flughafen-bezogene API-Endpunkte
 */

require_once dirname(__DIR__) . '/src/bootstrap.php';

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

$action = $_GET['action'] ?? $_POST['action'] ?? '';

switch ($action) {
    case 'list':
        handleList();
        break;
    
    case 'get':
        handleGet();
        break;
    
    case 'search':
        handleSearch();
        break;
    
    case 'distance':
        handleDistance();
        break;
    
    default:
        jsonResponse(['error' => 'Unbekannte Aktion'], 400);
}

function handleList() {
    global $db;
    
    // Airports aus CSV laden falls nötig
    $airports = $db->getAllAirports();
    if (empty($airports)) {
        $config = require dirname(__DIR__) . '/src/config.php';
        $count = $db->loadAirportsFromCsv($config['paths']['data'] . '/airports.csv');
        $airports = $db->getAllAirports();
    }
    
    // Optional filtern
    $continent = $_GET['continent'] ?? null;
    $country = $_GET['country'] ?? null;
    
    if ($continent) {
        $airports = array_filter($airports, fn($a) => $a['continent'] === $continent);
    }
    
    if ($country) {
        $airports = array_filter($airports, fn($a) => $a['country'] === $country);
    }
    
    jsonResponse([
        'success' => true,
        'airports' => array_values($airports),
        'count' => count($airports)
    ]);
}

function handleGet() {
    global $db;
    
    $id = (int) ($_GET['id'] ?? 0);
    $iata = $_GET['iata'] ?? '';
    
    if ($id > 0) {
        $airport = $db->selectOne("SELECT * FROM airports WHERE id = ?", [$id]);
    } elseif ($iata) {
        $airport = $db->getAirportByIata($iata);
    } else {
        jsonResponse(['error' => 'ID oder IATA-Code erforderlich'], 400);
    }
    
    if (!$airport) {
        jsonResponse(['error' => 'Flughafen nicht gefunden'], 404);
    }
    
    jsonResponse([
        'success' => true,
        'airport' => $airport
    ]);
}

function handleSearch() {
    global $db;
    
    $query = trim($_GET['q'] ?? '');
    
    if (strlen($query) < 2) {
        jsonResponse(['error' => 'Suchbegriff zu kurz (min 2 Zeichen)'], 400);
    }
    
    $query = '%' . $query . '%';
    
    $airports = $db->select(
        "SELECT * FROM airports 
         WHERE name LIKE ? OR city LIKE ? OR iata_code LIKE ? OR country LIKE ?
         ORDER BY name
         LIMIT 20",
        [$query, $query, $query, $query]
    );
    
    jsonResponse([
        'success' => true,
        'airports' => $airports,
        'count' => count($airports)
    ]);
}

function handleDistance() {
    global $db;
    
    $from = (int) ($_GET['from'] ?? 0);
    $to = (int) ($_GET['to'] ?? 0);
    
    if ($from <= 0 || $to <= 0) {
        jsonResponse(['error' => 'Gültige Flughafen-IDs erforderlich'], 400);
    }
    
    $fromAirport = $db->selectOne("SELECT * FROM airports WHERE id = ?", [$from]);
    $toAirport = $db->selectOne("SELECT * FROM airports WHERE id = ?", [$to]);
    
    if (!$fromAirport || !$toAirport) {
        jsonResponse(['error' => 'Ein oder beide Flughäfen nicht gefunden'], 404);
    }
    
    $distance = $db->calculateDistance(
        $fromAirport['latitude'], $fromAirport['longitude'],
        $toAirport['latitude'], $toAirport['longitude']
    );
    
    jsonResponse([
        'success' => true,
        'distance' => $distance,
        'from' => $fromAirport,
        'to' => $toAirport
    ]);
}