<?php
/**
 * GPUQ SHARP-Exec: wird vom GPUQ-Worker aufgerufen (job_type vr_sharp_splat).
 * POST { _gpuq_secret, pano_id } → erzeugt 360°-Gaussian-Splat der Szene
 * (Apple SHARP über die 4 horizontalen Cube-Faces, gemerged).
 */

header('Content-Type: application/json; charset=utf-8');
set_time_limit(1800);

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    http_response_code(405);
    echo json_encode(['ok' => false, 'message' => 'Method not allowed']);
    exit;
}

$config = require __DIR__ . '/config.gpuq.php';

$raw = file_get_contents('php://input') ?: '';
$body = json_decode($raw, true);
if (!is_array($body)) {
    http_response_code(400);
    echo json_encode(['ok' => false, 'message' => 'Invalid JSON payload']);
    exit;
}

$secret = (string)($body['_gpuq_secret'] ?? '');
if ($secret === '' || !hash_equals((string)($config['self_exec_secret'] ?? ''), $secret)) {
    http_response_code(403);
    echo json_encode(['ok' => false, 'message' => 'Forbidden']);
    exit;
}

$panoId = (int)($body['pano_id'] ?? 0);
if ($panoId <= 0) {
    http_response_code(400);
    echo json_encode(['ok' => false, 'message' => 'Invalid pano_id']);
    exit;
}

$python = '/home/panomity.de/sharp/.venv/bin/python3';
$script = '/home/panomity.de/sharp/sharp_batch.py';
if (!is_file($python) || !is_file($script)) {
    http_response_code(500);
    echo json_encode(['ok' => false, 'message' => 'SHARP not installed']);
    exit;
}

$cmd = escapeshellarg($python) . ' ' . escapeshellarg($script)
    . ' --panos ' . escapeshellarg((string)$panoId) . ' 2>&1';
$output = shell_exec($cmd);

$plyPath = '/home/panomity.de/sharp-out/p' . $panoId . '_360.ply';
if (!is_file($plyPath)) {
    http_response_code(502);
    echo json_encode([
        'ok' => false,
        'message' => 'SHARP produced no output',
        'log' => mb_substr((string)$output, -800),
    ]);
    exit;
}

// Splat in den Tour-Ordner veröffentlichen.
$publicDir = __DIR__ . '/../panos/p' . $panoId . '.tiles';
$publicPath = $publicDir . '/splat.ply';
if (is_dir($publicDir)) {
    @copy($plyPath, $publicPath);
}

echo json_encode([
    'ok' => true,
    'pano_id' => $panoId,
    'ply' => is_file($publicPath) ? ('panos/p' . $panoId . '.tiles/splat.ply') : $plyPath,
    'size_bytes' => filesize($plyPath),
], JSON_UNESCAPED_UNICODE);