<?php
/**
 * Get CSV Preview for Specific File Index
 */

session_start();

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

try {
    // Check if processed data exists
    if (!isset($_SESSION['processed_csv'])) {
        echo json_encode([
            'success' => false,
            'error' => 'No processed data found'
        ]);
        exit;
    }

    $fileIndex = isset($_GET['fileIndex']) ? (int)$_GET['fileIndex'] : 0;
    $processedData = $_SESSION['processed_csv'];

    if (!isset($processedData['files'][$fileIndex])) {
        echo json_encode([
            'success' => false,
            'error' => 'Invalid file index'
        ]);
        exit;
    }

    require_once __DIR__ . '/vendor/autoload.php';

    $csvFile = $processedData['files'][$fileIndex];

    // Parse CSV and return all rows
    $csvReader = \League\Csv\Reader::createFromString($csvFile['content']);
    $csvReader->setHeaderOffset(0);
    $previewRows = iterator_to_array($csvReader->getRecords());

    echo json_encode([
        'success' => true,
        'filename' => $csvFile['filename'],
        'isoCode' => $csvFile['isoCode'],
        'preview' => $previewRows,
        'rowCount' => count($previewRows)
    ]);

} catch (Exception $e) {
    echo json_encode([
        'success' => false,
        'error' => $e->getMessage()
    ]);
}