<?php
header('Content-Type: application/json');

require_once(__DIR__ . '/include/headscript.php');

try {
    $db = DBHandlerSelect::getInstance();
    $pdo = $db->getConnection();

    $iduser = $iduserlogin ?? null;

    $input = json_decode(file_get_contents('php://input'), true);

    if (empty($input['ids']) || !is_array($input['ids'])) {
        throw new Exception('Nessun file selezionato.');
    }

    $ids = array_values(array_filter(array_map('intval', $input['ids'])));

    if (empty($ids)) {
        throw new Exception('ID non validi.');
    }

    /*
     * Local Python service URL.
     * In produzione su cPanel/Keliweb lo sostituiremo con l'URL reale del servizio Python.
     */
    $pythonServiceUrl = 'http://127.0.0.1:5055/calculate';

    $results = [];

    foreach ($ids as $id) {

        /*
         * Recupero job.
         * Uso placeholder ? per evitare errori PDO HY093.
         */
        if ($iduser === null || $iduser === '') {
            $stmt = $pdo->prepare("
                SELECT *
                FROM cad_area_jobs
                WHERE id = ?
                LIMIT 1
            ");

            $stmt->execute([
                $id
            ]);
        } else {
            $stmt = $pdo->prepare("
                SELECT *
                FROM cad_area_jobs
                WHERE id = ?
                AND iduser = ?
                LIMIT 1
            ");

            $stmt->execute([
                $id,
                $iduser
            ]);
        }

        $job = $stmt->fetch(PDO::FETCH_ASSOC);

        if (!$job) {
            $results[] = [
                'id' => $id,
                'success' => false,
                'message' => 'Record non trovato.'
            ];
            continue;
        }

        if (empty($job['file_path']) || !file_exists($job['file_path'])) {
            updateJobError($pdo, $id, 'File PDF non trovato sul server.');

            $results[] = [
                'id' => $id,
                'success' => false,
                'message' => 'File PDF non trovato sul server.'
            ];
            continue;
        }

        $stmtProcessing = $pdo->prepare("
            UPDATE cad_area_jobs
            SET 
                status = ?,
                message = ?
            WHERE id = ?
        ");

        $stmtProcessing->execute([
            'processing',
            null,
            $id
        ]);

        $pythonResponse = callPythonAreaService(
            $pythonServiceUrl,
            $job['file_path'],
            $job['original_filename']
        );

        if (empty($pythonResponse['success'])) {
            updateJobError(
                $pdo,
                $id,
                $pythonResponse['message'] ?? 'Errore servizio Python.',
                $pythonResponse
            );

            $results[] = [
                'id' => $id,
                'success' => false,
                'message' => $pythonResponse['message'] ?? 'Errore servizio Python.',
                'python_response' => $pythonResponse
            ];
            continue;
        }

        $areaMm2 = isset($pythonResponse['area_mm2']) && $pythonResponse['area_mm2'] !== null
            ? (float)$pythonResponse['area_mm2']
            : null;

        $areaCm2 = isset($pythonResponse['area_cm2']) && $pythonResponse['area_cm2'] !== null
            ? (float)$pythonResponse['area_cm2']
            : ($areaMm2 !== null ? $areaMm2 / 100 : null);

        $areaM2 = isset($pythonResponse['area_m2']) && $pythonResponse['area_m2'] !== null
            ? (float)$pythonResponse['area_m2']
            : ($areaMm2 !== null ? $areaMm2 / 1000000 : null);

        $stmtUpdate = $pdo->prepare("
            UPDATE cad_area_jobs
            SET
                status = ?,
                area_mm2 = ?,
                area_cm2 = ?,
                area_m2 = ?,
                scale_detected = ?,
                confidence = ?,
                message = ?,
                python_response = ?
            WHERE id = ?
        ");

        $stmtUpdate->execute([
            'completed',
            $areaMm2,
            $areaCm2,
            $areaM2,
            $pythonResponse['scale_detected'] ?? null,
            $pythonResponse['confidence'] ?? null,
            $pythonResponse['message'] ?? null,
            json_encode($pythonResponse, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE),
            $id
        ]);

        $results[] = [
            'id' => $id,
            'success' => true,
            'area_mm2' => $areaMm2,
            'area_cm2' => $areaCm2,
            'area_m2' => $areaM2,
            'message' => $pythonResponse['message'] ?? null
        ];
    }

    echo json_encode([
        'success' => true,
        'results' => $results
    ]);
} catch (Throwable $e) {
    error_log('CAD area process error: ' . $e->getMessage());
    error_log('File: ' . $e->getFile());
    error_log('Line: ' . $e->getLine());

    echo json_encode([
        'success' => false,
        'message' => $e->getMessage(),
        'file' => $e->getFile(),
        'line' => $e->getLine()
    ]);
}


function callPythonAreaService(string $url, string $filePath, string $originalFilename): array
{
    if (!class_exists('CURLFile')) {
        return [
            'success' => false,
            'message' => 'CURLFile non disponibile sul server PHP.'
        ];
    }

    if (!function_exists('curl_init')) {
        return [
            'success' => false,
            'message' => 'Estensione PHP cURL non disponibile.'
        ];
    }

    $curlFile = new CURLFile($filePath, 'application/pdf', $originalFilename);

    $postFields = [
        'file' => $curlFile,
        'mode' => 'pdf_vector',
        'scale_ratio' => '1'
    ];

    $ch = curl_init();

    curl_setopt_array($ch, [
        CURLOPT_URL => $url,
        CURLOPT_POST => true,
        CURLOPT_POSTFIELDS => $postFields,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_TIMEOUT => 180,
        CURLOPT_CONNECTTIMEOUT => 20,
        CURLOPT_SSL_VERIFYPEER => false,
        CURLOPT_SSL_VERIFYHOST => false
    ]);

    $response = curl_exec($ch);

    if ($response === false) {
        $error = curl_error($ch);
        curl_close($ch);

        return [
            'success' => false,
            'message' => 'Errore cURL verso Python: ' . $error
        ];
    }

    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);

    $decoded = json_decode($response, true);

    if ($httpCode < 200 || $httpCode >= 300) {
        return [
            'success' => false,
            'message' => 'Servizio Python HTTP ' . $httpCode,
            'raw_response' => $response
        ];
    }

    if (!is_array($decoded)) {
        return [
            'success' => false,
            'message' => 'Risposta Python non valida.',
            'raw_response' => $response
        ];
    }

    return $decoded;
}


function updateJobError(PDO $pdo, int $id, string $message, ?array $pythonResponse = null): void
{
    $stmt = $pdo->prepare("
        UPDATE cad_area_jobs
        SET
            status = ?,
            message = ?,
            python_response = ?
        WHERE id = ?
    ");

    $stmt->execute([
        'error',
        $message,
        $pythonResponse
            ? json_encode($pythonResponse, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE)
            : null,
        $id
    ]);
}