<?php
/**
 * app/modules/rooms/save.php
 *
 * Speichert oder aktualisiert einen Raum.
 */

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    header('Location: ?module=locations&action=list');
    exit;
}

$roomId = (int)($_POST['id'] ?? 0);
$name = trim((string)($_POST['name'] ?? ''));
$number = trim((string)($_POST['number'] ?? ''));
$floorId = (int)($_POST['floor_id'] ?? 0);
$comment = trim((string)($_POST['comment'] ?? ''));
$rawPolygon = trim((string)($_POST['polygon_points'] ?? ''));

if ($name === '' || $floorId <= 0) {
    $errors = [];
    if ($name === '') {
        $errors[] = 'Name ist erforderlich';
    }
    if ($floorId <= 0) {
        $errors[] = 'Stockwerk ist erforderlich';
    }
    $_SESSION['error'] = implode(', ', $errors);
    $_SESSION['validation_errors'] = $errors;
    $redirect = $roomId > 0 ? "?module=rooms&action=edit&id=$roomId" : "?module=rooms&action=edit&floor_id=$floorId";
    header("Location: $redirect");
    exit;
}

$polygonPoints = [];
$polygonJson = null;
$x = null;
$y = null;
$width = null;
$height = null;

if ($rawPolygon !== '') {
    $decoded = json_decode($rawPolygon, true);
    if (is_array($decoded)) {
        foreach ($decoded as $point) {
            if (!is_array($point)) {
                continue;
            }
            $px = isset($point['x']) ? (float)$point['x'] : null;
            $py = isset($point['y']) ? (float)$point['y'] : null;
            if (!is_finite($px) || !is_finite($py)) {
                continue;
            }
            $polygonPoints[] = [
                'x' => (int)round($px),
                'y' => (int)round($py),
            ];
        }
    }
}

if (count($polygonPoints) >= 3) {
    $xs = array_column($polygonPoints, 'x');
    $ys = array_column($polygonPoints, 'y');
    $minX = min($xs);
    $maxX = max($xs);
    $minY = min($ys);
    $maxY = max($ys);
    $x = (int)$minX;
    $y = (int)$minY;
    $width = (int)max(1, $maxX - $minX);
    $height = (int)max(1, $maxY - $minY);
    $polygonJson = json_encode($polygonPoints, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
}

if (roomsHasPolygonColumn($sql)) {
    if ($roomId > 0) {
        $sql->set(
            "UPDATE rooms
             SET floor_id = ?, name = ?, number = ?, x = ?, y = ?, width = ?, height = ?, polygon_points = ?, comment = ?
             WHERE id = ?",
            "issiiiissi",
            [$floorId, $name, $number, $x, $y, $width, $height, $polygonJson, $comment, $roomId]
        );
    } else {
        $sql->set(
            "INSERT INTO rooms (floor_id, name, number, x, y, width, height, polygon_points, comment)
             VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)",
            "issiiiiss",
            [$floorId, $name, $number, $x, $y, $width, $height, $polygonJson, $comment]
        );
    }
} else {
    if ($roomId > 0) {
        $sql->set(
            "UPDATE rooms
             SET floor_id = ?, name = ?, number = ?, x = ?, y = ?, width = ?, height = ?, comment = ?
             WHERE id = ?",
            "issiiiisi",
            [$floorId, $name, $number, $x, $y, $width, $height, $comment, $roomId]
        );
    } else {
        $sql->set(
            "INSERT INTO rooms (floor_id, name, number, x, y, width, height, comment)
             VALUES (?, ?, ?, ?, ?, ?, ?, ?)",
            "issiiiis",
            [$floorId, $name, $number, $x, $y, $width, $height, $comment]
        );
    }
}

$_SESSION['success'] = $roomId > 0 ? 'Raum gespeichert' : 'Raum erstellt';
header('Location: ?module=locations&action=list');
exit;

function roomsHasPolygonColumn($sql)
{
    static $hasColumn = null;
    if ($hasColumn !== null) {
        return $hasColumn;
    }
    $col = $sql->single("SHOW COLUMNS FROM rooms LIKE 'polygon_points'", "", []);
    $hasColumn = !empty($col);
    return $hasColumn;
}