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

$file = $_FILES['file'] ?? null;
$action = $_POST['action'] ?? 'analyze';

if (!$file || $file['error'] !== UPLOAD_ERR_OK) {
    echo json_encode(['error' => 'No file uploaded']);
    exit;
}

$ext = strtolower(pathinfo($file['name'], PATHINFO_EXTENSION));
$tmpPath = $file['tmp_name'];
$content = '';

switch ($ext) {
    case 'txt':
    case 'md':
    case 'csv':
        $content = file_get_contents($tmpPath);
        break;
        
    case 'pdf':
        // Utiliser pdftotext si disponible, sinon Python
        exec("pdftotext '$tmpPath' - 2>/dev/null", $out);
        if (empty($out)) {
            exec("python3 -c \"import PyPDF2; f=open('$tmpPath','rb'); r=PyPDF2.PdfReader(f); print(''.join(p.extract_text() or '' for p in r.pages[:10]))\" 2>/dev/null", $out);
        }
        $content = implode("\n", $out);
        break;
        
    case 'docx':
        exec("python3 -c \"from docx import Document; d=Document('$tmpPath'); print('\\n'.join(p.text for p in d.paragraphs[:100]))\" 2>/dev/null", $out);
        $content = implode("\n", $out);
        break;
        
    case 'xlsx':
    case 'xls':
        exec("python3 -c \"import pandas as pd; df=pd.read_excel('$tmpPath'); print(df.head(50).to_string())\" 2>/dev/null", $out);
        $content = implode("\n", $out);
        break;
        
    case 'json':
        $content = json_encode(json_decode(file_get_contents($tmpPath)), JSON_PRETTY_PRINT);
        break;
        
    default:
        $content = file_get_contents($tmpPath);
}

$content = substr($content, 0, 10000); // Limite 10K chars

echo json_encode([
    'success' => true,
    'filename' => $file['name'],
    'type' => $ext,
    'size' => $file['size'],
    'content' => $content,
    'chars' => strlen($content)
]);