<?php

namespace App\Service\Import;

use PhpOffice\PhpSpreadsheet\IOFactory;
use PhpOffice\PhpSpreadsheet\Writer\Xlsx;

use Box\Spout\Reader\Common\Creator\ReaderEntityFactory;


class ExcelFileTransformer
{
    public function transform(string $filePath, string $type = 'csv', int $headerPosition = 3): string
    {
        if (!file_exists($filePath)) {
            throw new \RuntimeException("Le fichier n'existe pas.");
        }

        $extension = strtolower(pathinfo($filePath, PATHINFO_EXTENSION));

        if ($extension === 'xls') {
            $filePath = $this->convertXlsToXlsx($filePath);
        } elseif ($extension === 'xlsx') {
            $filePath = $this->purgeXlsx($filePath);
        } else {
            throw new \RuntimeException("Format non pris en charge : .$extension");
        }

        $reader = ReaderEntityFactory::createXLSXReader();
        $reader->open($filePath);

        $tmpCsvPath = tempnam(sys_get_temp_dir(), 'converted_') . '.' . $type;
        $handle = fopen($tmpCsvPath, 'w');

        $rowIndex = 1;
        foreach ($reader->getSheetIterator() as $sheet) {
            if ($sheet->getName() !== '__ACTIVE_SHEET__') {
                continue;
            }
            foreach ($sheet->getRowIterator() as $row) {
                if ($rowIndex++ < $headerPosition) {
                    continue;
                }
    
                $cells = array_map(function($cell) {
                    $value = $cell->getValue();
                    if ($value instanceof \DateTime) {
                        return $value->format('Y-m-d H:i');
                    }
                    return $value;
                }, $row->getCells());
    
                fputcsv($handle, $cells);
            }
            break;
        }
        $reader->close();
        fclose($handle);

        return $tmpCsvPath;
    }

    private function convertXlsToXlsx(string $xlsFilePath): string
    {
        if (!file_exists($xlsFilePath)) {
            throw new \RuntimeException("Le fichier XLS n'existe pas : $xlsFilePath");
        }
        $reader = IOFactory::createReader('Xls');
        $reader->setReadDataOnly(false);
        $spreadsheet = $reader->load($xlsFilePath);
        $activeSheet = $spreadsheet->getSheet($spreadsheet->getActiveSheetIndex());
        $originalTitle = $activeSheet->getTitle();
        $activeSheet->setTitle('__ACTIVE_SHEET__');
        $xlsxFilePath = tempnam(sys_get_temp_dir(), 'converted_') . '.xlsx';
        $writer = new Xlsx($spreadsheet);
        $writer->setPreCalculateFormulas(false);
        $writer->save($xlsxFilePath);
        $activeSheet->setTitle($originalTitle);
        return $xlsxFilePath;
    }

    private function purgeXlsx(string $filePath): string
    {
        $reader = IOFactory::createReader('Xlsx');
        $reader->setReadDataOnly(false);
        $spreadsheet = $reader->load($filePath);

        $activeSheet = $spreadsheet->getSheet($spreadsheet->getActiveSheetIndex());
        $originalTitle = $activeSheet->getTitle();
        $activeSheet->setTitle('__ACTIVE_SHEET__');

        $purgedPath = tempnam(sys_get_temp_dir(), 'purged_') . '.xlsx';
        $writer = new Xlsx($spreadsheet);
        $writer->setPreCalculateFormulas(false);
        $writer->save($purgedPath);

        // Optionally restore original title in memory
        $activeSheet->setTitle($originalTitle);

        return $purgedPath;
    }
}