SistemaMantenimiento/sistema-mantenimiento-back/app/Http/Controllers/ValidateLoadArchivesController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Validator;
use Illuminate\Support\Facades\Log;
use PhpOffice\PhpSpreadsheet\IOFactory;
use ZipArchive;

/**
 * Controller for validating Excel and ZIP files for equipment documentation loading
 * Validates Excel headers structure and compares file listings with ZIP contents
 */
class ValidateLoadArchivesController extends Controller
{
    private $responseController;
    
    // Expected headers in row 7 of Excel file with their corresponding column letters
    private $expectedHeaders = [
        ['letter' => 'D', 'category' => 'CÓDIGO DE EQUIPO'],
        ['letter' => 'H', 'category' => 'FICHA DE SEGURIDAD DE PRODUCTOS QUÍMICOS'],
        ['letter' => 'J', 'category' => 'FICHA TÉCNICA'],
        ['letter' => 'L', 'category' => 'FOTOGRAFÍAS - DIAGRAMAS'],
        ['letter' => 'N', 'category' => 'DATOS DEL PROVEEDOR'],
        ['letter' => 'P', 'category' => 'MANUALES DE OPERACIÓN'],
        ['letter' => 'R', 'category' => 'MANUALES DE MANTENIMIENTO PREVENTIVO'],
        ['letter' => 'T', 'category' => 'MANUALES DE MANTENIMIENTO CORRECTIVO'],
        ['letter' => 'V', 'category' => 'DOCUMENTOS ADICIONALES']
    ];
    
    // Mapping of file extensions to their types for validation
    private $extensionTypes = [
        'pdf' => 'PDF',
        'jpg' => 'IMG', 'jpeg' => 'IMG', 'png' => 'IMG', 'gif' => 'IMG', 'bmp' => 'IMG',
        'xlsx' => 'EXCEL', 'xls' => 'EXCEL'
    ];

    public function __construct()
    {
        $this->responseController = new ResponseController();
    }
        
    /**
     * Main validation endpoint that validates both Excel and ZIP files
     * Checks Excel headers, ZIP integrity, file listings, and compares them
     */
    public function validateFiles(Request $request)
    {
        Log::info('=== INICIANDO VALIDACIÓN DE ARCHIVOS ===');
        
        // Validate request inputs
        Log::info('Paso 1: Validando tipos de archivo');
        $validator = Validator::make($request->all(), [
            'excel_file' => 'required|file|mimes:xlsx,xls',
            'zip_file' => 'required|file|mimes:zip'
        ]);

        if ($validator->fails()) {
            Log::error('Error en validación de tipos de archivo', $validator->errors()->toArray());
            return $this->responseController->makeResponse(
                true,
                'Se encontraron uno o más errores.',
                $this->responseController->makeErrors($validator->errors()->messages()),
                400
            );
        }
        Log::info('✓ Tipos de archivo válidos');

        // Validate Excel file headers structure
        Log::info('Paso 2: Validando encabezados de Excel');
        $excelValidation = $this->validateExcelHeaders($request->file('excel_file'));
        if ($excelValidation['error']) {
            Log::error('Error en encabezados Excel: ' . $excelValidation['message']);
            return $this->responseController->makeResponse(true, $excelValidation['message'], [], 400);
        }
        Log::info('✓ Encabezados de Excel válidos');
        
        // Extract and validate file listings from Excel
        Log::info('Paso 3: Extrayendo listado de archivos del Excel');
        $filesValidation = $this->extractAndValidateFiles($request->file('excel_file'));
        if ($filesValidation['error']) {
            Log::error('Error extrayendo archivos Excel: ' . $filesValidation['message']);
            return $this->responseController->makeResponse(true, $filesValidation['message'], [], 400);
        }
        Log::info('✓ Archivos extraídos: ' . count($filesValidation['files']) . ' archivos encontrados');

        // Validate ZIP file integrity
        Log::info('Paso 4: Validando integridad del archivo ZIP');
        $zipValidation = $this->validateZipFile($request->file('zip_file'));
        if ($zipValidation['error']) {
            Log::error('Error validando ZIP: ' . $zipValidation['message']);
            return $this->responseController->makeResponse(true, $zipValidation['message'], [], 400);
        }
        Log::info('✓ Archivo ZIP válido');

        // Compare Excel file listings with ZIP contents
        Log::info('Paso 5: Comparando listados Excel vs ZIP');
        $comparison = $this->compareExcelWithZip($filesValidation['files'], $request->file('zip_file'));
        
        Log::info('✓ Comparación completada', [
            'valid' => $comparison['valid'],
            'missing_in_zip' => count($comparison['missing_in_zip']),
            'extra_in_zip' => count($comparison['extra_in_zip'])
        ]);
        
        Log::info('=== VALIDACIÓN COMPLETADA EXITOSAMENTE ===');
        return $this->responseController->makeResponse(false, 'Validación completada.', $comparison);
    }

    /**
     * Validates that Excel file has the correct headers in row 7
     * Each column must match the expected category name exactly
     */
    private function validateExcelHeaders($file)
    {
        try {
            Log::info('  - Cargando archivo Excel: ' . $file->getClientOriginalName());
            $spreadsheet = IOFactory::load($file->getPathname());
            $worksheet = $spreadsheet->getActiveSheet();
            Log::info('  - Excel cargado, validando encabezados en fila 7');
            
            // Check each expected header in row 7
            foreach ($this->expectedHeaders as $header) {
                $cellValue = $worksheet->getCell($header['letter'] . '7')->getValue();
                if (trim($cellValue) !== $header['category']) {
                    return [
                        'error' => true,
                        'message' => "El encabezado en la columna {$header['letter']} no coincide. Se esperaba: '{$header['category']}', se encontró: '{$cellValue}'"
                    ];
                }
            }
            
            return ['error' => false];
        } catch (\Exception $e) {
            return ['error' => true, 'message' => 'Error al procesar el archivo Excel: ' . $e->getMessage()];
        }
    }

    /**
     * Validates ZIP file integrity and ensures it's not empty
     */
    private function validateZipFile($file)
    {
        Log::info('  - Abriendo archivo ZIP: ' . $file->getClientOriginalName());
        $zip = new ZipArchive();
        $result = $zip->open($file->getPathname());
        
        if ($result !== TRUE) {
            return ['error' => true, 'message' => 'No se pudo abrir el archivo ZIP.'];
        }
        
        if ($zip->numFiles === 0) {
            $zip->close();
            return ['error' => true, 'message' => 'El archivo ZIP está vacío.'];
        }
        
        Log::info('  - ZIP contiene ' . $zip->numFiles . ' archivos');
        $zip->close();
        return ['error' => false];
    }
    
    /**
     * Extracts file listings from Excel starting from row 8
     * Validates file extensions and creates structured file list
     * Only processes rows with equipment code (column D)
     */
    private function extractAndValidateFiles($file)
    {
        try {
            $spreadsheet = IOFactory::load($file->getPathname());
            $worksheet = $spreadsheet->getActiveSheet();
            $highestRow = $worksheet->getHighestRow();
            Log::info('  - Procesando ' . ($highestRow - 7) . ' filas de datos (filas 8-' . $highestRow . ')');
            $files = [];
            
            // Process each row starting from row 8 (data rows)
            for ($row = 8; $row <= $highestRow; $row++) {
                $equipmentCode = trim($worksheet->getCell('D' . $row)->getValue());
                if (empty($equipmentCode)) continue; // Skip rows without equipment code
                
                $hasFiles = false;
                $rowFiles = [];
                
                // Check each file category column (excluding equipment code column D)
                foreach ($this->expectedHeaders as $header) {
                    if ($header['letter'] === 'D') continue;
                    
                    $cellValue = trim($worksheet->getCell($header['letter'] . $row)->getValue());
                    if (empty($cellValue)) continue;
                    
                    // Handle multiple files separated by commas
                    $fileNames = explode(',', $cellValue);
                    foreach ($fileNames as $fileName) {
                        $fileName = trim($fileName);
                        if (empty($fileName)) continue;
                        
                        // Validate file extension
                        $extension = strtolower(pathinfo($fileName, PATHINFO_EXTENSION));
                        if (!isset($this->extensionTypes[$extension])) {
                            return [
                                'error' => true,
                                'message' => "Extensión inválida '{$extension}' en archivo '{$fileName}' para equipo '{$equipmentCode}'"
                            ];
                        }
                        
                        $rowFiles[] = [
                            'equipment_code' => $equipmentCode,
                            'category' => $header['category'],
                            'file_name' => $fileName,
                            'type' => $this->extensionTypes[$extension]
                        ];
                        $hasFiles = true;
                    }
                }
                
                if ($hasFiles) {
                    $files = array_merge($files, $rowFiles);
                }
            }
            
            return ['error' => false, 'files' => $files];
        } catch (\Exception $e) {
            return ['error' => true, 'message' => 'Error al extraer archivos del Excel: ' . $e->getMessage()];
        }
    }
    
    /**
     * Compares file listings from Excel with actual files in ZIP
     * Returns validation status and lists of missing/extra files
     */
    private function compareExcelWithZip($excelFiles, $zipFile)
    {
        $zip = new ZipArchive();
        $zip->open($zipFile->getPathname());
        
        // Extract all file names from ZIP
        Log::info('  - Extrayendo nombres de archivos del ZIP');
        $zipFiles = [];
        for ($i = 0; $i < $zip->numFiles; $i++) {
            $fullPath = $zip->getNameIndex($i);
            
            // Skip directories (entries ending with /)
            if (substr($fullPath, -1) === '/') {
                continue;
            }
            
            // Extract only filename without path
            $fileName = basename($fullPath);
            if (!empty($fileName)) {
                $zipFiles[] = $fileName;
            }
        }
        $zip->close();
        Log::info('  - ZIP contiene ' . count($zipFiles) . ' archivos (excluyendo directorios)');
        
        // Get file names from Excel listings
        $excelFileNames = array_column($excelFiles, 'file_name');
        Log::info('  - Excel lista ' . count($excelFileNames) . ' archivos');
        
        // Find discrepancies between Excel and ZIP
        $missingInZip = array_diff($excelFileNames, $zipFiles);
        $extraInZip = array_diff($zipFiles, $excelFileNames);
        Log::info('  - Archivos faltantes en ZIP: ' . count($missingInZip));
        Log::info('  - Archivos extra en ZIP: ' . count($extraInZip));
        
        return [
            'valid' => empty($missingInZip) && empty($extraInZip),
            'missing_in_zip' => array_values($missingInZip),
            'extra_in_zip' => array_values($extraInZip)
        ];
    }
}