<?php
require_once dirname(__DIR__, 2) . '/vendor/autoload.php';
require_once dirname(__FILE__) . '/class/VisualLimsApiClient.class.php';

ini_set('display_errors', '1');
error_reporting(E_ALL);
set_time_limit(60);

/**
 * Uso: get_pdf.php?id=591749
 */

try {
    $api = VisualLimsApiClient::getInstance();

    $idRapportoFile = isset($_GET['id']) ? intval($_GET['id']) : 0;

    if (!$idRapportoFile) {
        throw new Exception("Parametro id mancante. Usa ?id=591749");
    }

    // STEP 1: leggi metadati entita
    $entityData = $api->get("RapportoFile(" . $idRapportoFile . ")");

    $pdfBody      = null;
    $strategyUsed = null;
    $debugLog     = array();

    // Strategia A - campo FileContent base64
    if (!empty($entityData['FileContent'])) {
        $decoded = base64_decode($entityData['FileContent'], true);
        if ($decoded !== false && substr($decoded, 0, 4) === '%PDF') {
            $pdfBody      = $decoded;
            $strategyUsed = 'A: FileContent base64';
        }
    }

    // Strategia B - campo Contenuto base64
    if (!$pdfBody && !empty($entityData['Contenuto'])) {
        $decoded = base64_decode($entityData['Contenuto'], true);
        if ($decoded !== false && substr($decoded, 0, 4) === '%PDF') {
            $pdfBody      = $decoded;
            $strategyUsed = 'B: Contenuto base64';
        }
    }

    // Recupera token e baseUrl dalla classe
    $token   = $api->getToken();
    $baseUrl = rtrim($api->getBaseUrl(), '/');

    $rawEndpoints = array(
        'C: $value'             => $baseUrl . '/api/odata/RapportoFile(' . $idRapportoFile . ')/$value',
        'D: FileContent/$value' => $baseUrl . '/api/odata/RapportoFile(' . $idRapportoFile . ')/FileContent/$value',
        'E: Contenuto/$value'   => $baseUrl . '/api/odata/RapportoFile(' . $idRapportoFile . ')/Contenuto/$value',
    );

    foreach ($rawEndpoints as $label => $url) {
        if ($pdfBody) break;

        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array(
            'Authorization: Bearer ' . $token,
            'Accept: application/pdf, application/octet-stream, */*',
        ));
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30);

        $body     = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $ct       = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
        curl_close($ch);

        $debugLog[$label] = array(
            'url'          => $url,
            'http_code'    => $httpCode,
            'content_type' => $ct,
            'body_start'   => substr((string)$body, 0, 300),
        );

        if ($httpCode === 200 && is_string($body) && substr($body, 0, 4) === '%PDF') {
            $pdfBody      = $body;
            $strategyUsed = $label;
        }
    }

    // RISPOSTA
    if ($pdfBody) {
        $fileName = isset($entityData['FileName']) ? $entityData['FileName'] : 'rapporto_' . $idRapportoFile . '.pdf';
        header('Content-Type: application/pdf');
        header('Content-Disposition: inline; filename="' . $fileName . '"');
        header('Content-Length: ' . strlen($pdfBody));
        header('Cache-Control: private, max-age=0, must-revalidate');
        echo $pdfBody;
        exit;
    }

    // Nessuna strategia ha funzionato
    header('Content-Type: application/json; charset=utf-8');
    echo json_encode(array(
        'success'          => false,
        'message'          => 'Nessuna strategia ha restituito un PDF valido.',
        'id_rapporto_file' => $idRapportoFile,
        'entity_fields'    => array_keys($entityData ? $entityData : array()),
        'entity_data'      => $entityData,
        'strategies_debug' => $debugLog,
    ), JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
} catch (Exception $e) {
    http_response_code(500);
    header('Content-Type: application/json; charset=utf-8');
    echo json_encode(array(
        'success' => false,
        'error'   => $e->getMessage(),
    ), JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
}