<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Validator;
use Illuminate\Support\Facades\DB;
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;
    private $encryptionController;
    private $documentManagementController;
    private $functionsController;
    
    // 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 = [
        // Archivos de almacenamiento
        'zip' => 'STORAGE', 'rar' => 'STORAGE', 'tar' => 'STORAGE', '7z' => 'STORAGE',
        // Formatos de audio
        'mp3' => 'AUDIO', 'mpeg' => 'AUDIO', 'wav' => 'AUDIO', 'ogg' => 'AUDIO', 'opus' => 'AUDIO',
        // Archivos de imagen
        'jpeg' => 'IMG', 'jpg' => 'IMG', 'png' => 'IMG', 'gif' => 'IMG', 'bmp' => 'IMG', 'tiff' => 'IMG', 'svg' => 'IMG',
        // Archivos de texto
        'txt' => 'TEXT',
        // Archivos de video
        'webm' => 'VIDEO', 'mpeg4' => 'VIDEO', 'mp4' => 'VIDEO', '3gpp' => 'VIDEO', 'mov' => 'VIDEO', 'avi' => 'VIDEO', 'wmv' => 'VIDEO', 'flv' => 'VIDEO',
        // Planos de Auto CAD
        'dwg' => 'CAD', 'dxf' => 'CAD',
        // Modelos de 3D Studio
        '3ds' => '3D',
        // Dibujos de Illustrator
        'ai' => 'ILLUSTRATOR',
        // Imágenes de Photoshop
        'psd' => 'PHOTOSHOP',
        // Formato de documento portátil
        'pdf' => 'PDF',
        // Hoja de cálculo en Excel
        'xls' => 'EXCEL', 'xlsx' => 'EXCEL',
        // Presentaciones de PowerPoint
        'ppt' => 'POWERPOINT', 'pptx' => 'POWERPOINT',
        // Documentos de texto de Word
        'doc' => 'WORD', 'docx' => 'WORD',
        // Dibujos de Visio
        'vsd' => 'VISIO', 'vsdx' => 'VISIO'
    ];


    public function __construct()
    {
        $this->responseController = new ResponseController();
        $this->encryptionController = new EncryptionController();
        $this->documentManagementController = new DocumentManagementController();
        $this->functionsController = new FunctionsController();
    }
        
    /**
     * 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)
    {
        ini_set('memory_limit', '-1');

        Log::info('ValidateFiles: Iniciando validación de archivos');
        
        // Validate request inputs
        $validator = Validator::make($request->all(), [
            'id_user' => 'required|string',
            'linea' => 'required|integer',
            'excel_file' => 'required|file|mimes:xlsx,xls',
            'zip_file' => 'required|file|mimes:zip'
        ]);

        if ($validator->fails()) {
            return $this->responseController->makeResponse(
                true,
                'Se encontraron uno o más errores.',
                $this->responseController->makeErrors($validator->errors()->messages()),
                400
            );
        }
        $idUser = '0000000001';
        // $idUser = $this->encryptionController->decrypt($request->input('id_user'));
        // if(!$idUser){
        //     return $this->responseController->makeResponse(true, "El id del usuario que realizó la petición no fue encriptado correctamente", [], 400);
        // }

        // Validate Excel file headers structure
        $excelValidation = $this->validateExcelHeaders($request->file('excel_file'));
        if ($excelValidation['error']) {
            return $this->responseController->makeResponse(true, $excelValidation['message'], [], 400);
        }
        Log::info('ValidateFiles: Headers Excel validados correctamente');
        
        // Validate ZIP file integrity
        $zipValidation = $this->validateZipFile($request->file('zip_file'));
        if ($zipValidation['error']) {
            return $this->responseController->makeResponse(true, $zipValidation['message'], [], 400);
        }
        Log::info('ValidateFiles: Archivo ZIP validado correctamente');

        // Extract and validate file listings from Excel
        $filesValidation = $this->extractAndValidateFiles($request->file('excel_file'));
        if ($filesValidation['error']) {
            return $this->responseController->makeResponse(true, $filesValidation['message'], [], 400);
        }
        Log::info('ValidateFiles: Archivos extraídos del Excel', ['count' => count($filesValidation['files'])]);

        
        // Compare Excel file listings with ZIP contents
        $comparison = $this->compareExcelWithZip($filesValidation['files'], $request->file('zip_file'));

        // Check for file size validation errors
        if (isset($comparison['error'])) {
            return $this->responseController->makeResponse(true, $comparison['error'], [], 400);
        }
        Log::info('ValidateFiles: Comparación Excel-ZIP completada', ['valid' => $comparison['valid']]);
        
        // Upload temp files if validation is successful
        if ($comparison['valid']) {
            $tempFiles = $this->uploadTempFiles($request);
            if ($tempFiles['error']) {
                Log::error('ValidateFiles: Error subiendo archivos temporales', ['message' => $tempFiles['message']]);
                return $this->responseController->makeResponse(true, $tempFiles['message'], [], 400);
            }
            Log::info('ValidateFiles: Archivos temporales subidos correctamente');
            
            // Extract and save individual files as temp
            $individualTempFiles = $this->extractAndSaveIndividualFilesAsTemp($request->file('zip_file'), $request->input('linea'), $idUser);
            if ($individualTempFiles === false) {
                Log::error('ValidateFiles: Error procesando archivos individuales');
                return $this->responseController->makeResponse(true, 'Error procesando archivos individuales', [], 400);
            }
            Log::info('ValidateFiles: Archivos individuales procesados', ['count' => count($individualTempFiles)]);
            
            $comparison['temp_files'] = $tempFiles['files'];
            
            $comparison['individual_temp_files'] = $individualTempFiles;
        }
        Log::info('ValidateFiles: 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 {
            $spreadsheet = IOFactory::load($file->getPathname());
            $worksheet = $spreadsheet->getActiveSheet();
            
            // 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}'"
                    ];
                }
            }
            
            Log::info('ValidateExcelHeaders: Todos los headers validados correctamente');
            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)
    {
        $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('ValidateZipFile: ZIP válido', ['num_files' => $zip->numFiles]);
        $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();
            $files = [];
            
            Log::info('ExtractAndValidateFiles: Iniciando extracción', ['total_rows' => $highestRow]);
            
            // 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 = $file->extension();
                        if (!isset($this->extensionTypes[$extension])) {
                            return [
                                'error' => true,
                                'message' => "Extensión inválida '{$extension}' en archivo '{$fileName}' para equipo '{$equipmentCode}'"
                            ];
                        }

                        
                        $rowFiles[] = [
                            'equipment_code' => $equipmentCode,
                            'file_name' => $fileName,
                            'type' => $this->getFileType($extension)
                        ];
                        $hasFiles = true;
                    }
                }
                
                if ($hasFiles) {
                    $files = array_merge($files, $rowFiles);
                }
            }
            
            Log::info('ExtractAndValidateFiles: Extracción completada', ['files_found' => count($files)]);
            return ['error' => false, 'files' => $files];
        } catch (\Exception $e) {
            Log::error('ExtractAndValidateFiles: Excepción', ['error' => $e->getMessage()]);
            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());
        
        Log::info('CompareExcelWithZip: Iniciando comparación');
        
        // Extract all file names and sizes from ZIP
        $zipFiles = [];
        $zipFileSizes = [];
        for ($i = 0; $i < $zip->numFiles; $i++) {
            $fullPath = $zip->getNameIndex($i);
            
            // Skip directories (entries ending with /)
            if (substr($fullPath, -1) === '/') {
                continue;
            }
            
            // Extract filename and size
            $fileName = basename($fullPath);
            if (!empty($fileName)) {
                $zipFiles[] = $fileName;
                $zipFileSizes[$fileName] = $zip->statIndex($i)['size'];
            }
        }
        $zip->close();
        
        // Validate file sizes using FunctionsController
        foreach ($zipFileSizes as $fileName => $size) {
            $extension = strtolower(pathinfo($fileName, PATHINFO_EXTENSION));
            if (!$this->functionsController->checkFileSize($extension, $size)) {
                $sizeMB = round($size / (1024 * 1024), 2);
                return [
                    'valid' => false,
                    'error' => "El archivo '{$fileName}' excede el límite de tamaño. Tamaño: {$sizeMB}MB"
                ];
            }
        }
        
        // Get file names from Excel listings
        $excelFileNames = array_column($excelFiles, 'file_name');
        
        // Find discrepancies between Excel and ZIP
        $missingInZip = array_diff($excelFileNames, $zipFiles);
        $extraInZip = array_diff($zipFiles, $excelFileNames);
        
        $isValid = empty($missingInZip) && empty($extraInZip);
        Log::info('CompareExcelWithZip: Comparación completada', [
            'valid' => $isValid,
            'missing_count' => count($missingInZip),
            'extra_count' => count($extraInZip)
        ]);
        
        return [
            'valid' => $isValid,
            'missing_in_zip' => array_values($missingInZip),
            'extra_in_zip' => array_values($extraInZip)
        ];
    }

    /**
     * Process Functions start here
     */
    
    /**
     * Process endpoint that moves temp files to final storage
     */
    public function processLoadArchives(Request $request)
    {
        $validator = Validator::make($request->all(), [
            'id_user' => 'required|string',
            'linea' => 'required|integer',
            'temp_files' => 'required|array',
            'temp_files.excel' => 'required|string',
            'temp_files.zip' => 'required|string',
            'individual_temp_files' => 'required|array'
        ]);

        if ($validator->fails()) {
            return $this->responseController->makeResponse(
                true,
                'Se encontraron uno o más errores.',
                $this->responseController->makeErrors($validator->errors()->messages()),
                400
            );
        }
        
        $form = $request->all();
        $idUser  = '0000000001';
        // $idUser = $this->encryptionController->decrypt($form['id_user']);
        // if (!$idUser) {
        //     return $this->responseController->makeResponse(true, 'ID de usuario inválido.', [], 400);
        // }
        
        $finalFiles = [];
        
        try {
            // Move Excel to final
            $excelFinal = $this->moveToFinal($form['temp_files']['excel'], $form['linea'], $idUser);
            if (!$excelFinal) {
                return $this->responseController->makeResponse(true, 'Error procesando Excel', [], 400);
            }
            $finalFiles['excel'] = $excelFinal;
            
            // Move ZIP to final
            $zipFinal = $this->moveToFinal($form['temp_files']['zip'], $form['linea'], $idUser);
            if (!$zipFinal) {
                return $this->responseController->makeResponse(true, 'Error procesando ZIP', [], 400);
            }
            $finalFiles['zip'] = $zipFinal;
            
            // Move individual temp files to final storage
            $individualFiles = [];
            foreach ($form['individual_temp_files'] as $tempFile) {
                $finalFileId = $this->moveToFinal($tempFile['temp_id'], $form['linea'], $idUser);
                if ($finalFileId) {
                    $individualFiles[] = [
                        'original_name' => $tempFile['original_name'],
                        'final_id' => $finalFileId
                    ];
                }
            }
            $finalFiles['individual_files'] = $individualFiles;
            return $this->responseController->makeResponse(false, 'Archivos procesados exitosamente.', $finalFiles);
            
        } catch (\Exception $e) {
            return $this->responseController->makeResponse(true, 'Error interno: ' . $e->getMessage(), [], 500);
        }
    }


    /**
     * Uploads Excel and ZIP files as temporary files using DocumentManagementController
     */
    private function uploadTempFiles(Request $request)
    {
        try {
            Log::info('UploadTempFiles: Iniciando subida de archivos temporales');
            $tempFiles = [];
            
            // Upload Excel file
            $excelRequest = new Request();
            $excelRequest->files->set('file', $request->file('excel_file'));
            $excelRequest->merge([
                'id_user' => $request->input('id_user'),
                'linea' => $request->input('linea')
            ]);
            
            $excelResponse = $this->documentManagementController->uploadTempFile($excelRequest);
            $excelData = json_decode($excelResponse->getContent());
            
            if ($excelData->error) {
                $errorMsg = isset($excelData->message) ? $excelData->message : 'Error desconocido subiendo Excel';
                Log::error('UploadTempFiles: Error subiendo Excel', ['message' => $errorMsg]);
                return ['error' => true, 'message' => 'Error subiendo Excel: ' . $errorMsg];
            }
            
            $tempFiles['excel'] = $excelData->response->idArchivo;
            
            // Upload ZIP file
            $zipRequest = new Request();
            $zipRequest->files->set('file', $request->file('zip_file'));
            $zipRequest->merge([
                'id_user' => $request->input('id_user'),
                'linea' => $request->input('linea')
            ]);
            
            $zipResponse = $this->documentManagementController->uploadTempFile($zipRequest);
            $zipData = json_decode($zipResponse->getContent());
            
            if ($zipData->error) {
                $errorMsg = isset($zipData->message) ? $zipData->message : 'Error desconocido subiendo ZIP';
                Log::error('UploadTempFiles: Error subiendo ZIP', ['message' => $errorMsg]);
                return ['error' => true, 'message' => 'Error subiendo ZIP: ' . $errorMsg];
            }
            
            $tempFiles['zip'] = $zipData->response->idArchivo;
            
            Log::info('UploadTempFiles: Archivos temporales subidos exitosamente', $tempFiles);
            return ['error' => false, 'files' => $tempFiles];
            
        } catch (\Exception $e) {
            Log::error('UploadTempFiles: Excepción', ['error' => $e->getMessage()]);
            return ['error' => true, 'message' => 'Error en uploadTempFiles: ' . $e->getMessage()];
        }
    }
    
   
    /**
     * Moves a temporary file to final storage using DocumentManagementController
     */
    private function moveToFinal($tempId, $line, $idUser)
    {
        try {
            $tempIdDec = $this->encryptionController->decrypt($tempId);
            if (!$tempIdDec) {
                return false;
            }
            
            $tempFile = DB::table('S002V01TARTE')->where('ARTE_IDAR', $tempIdDec)->first();
            if (!$tempFile) {
                return false;
            }
            
            $result = $this->documentManagementController->moveFinalFile($line, 'ADSI', 'LA', $tempFile, $idUser);
            return $result[0] ? $result[1] : false;
            
        } catch (\Exception $e) {
            return false;
        }
    }
    
    /**
     * Extracts individual files from ZIP and saves them as temporary files
     * Files are extracted to first level to avoid long paths and improve performance
     */
    private function extractAndSaveIndividualFilesAsTemp($zipFile, $line, $idUser)
    {
        try {
            $zip = new ZipArchive();
            if ($zip->open($zipFile->getPathname()) !== TRUE) {
                return false;
            }
            
            $tempFiles = [];
            $tempDir = storage_path('app/tempFiles/extracted_' . time());
            mkdir($tempDir, 0755, true);
            
            for ($i = 0; $i < $zip->numFiles; $i++) {
                $fullPath = $zip->getNameIndex($i);
                
                // Skip directories
                if (substr($fullPath, -1) === '/') {
                    continue;
                }
                
                $fileName = basename($fullPath);
                if (empty($fileName)) continue;
                
                // Extract file directly to first level using file content
                $fileContent = $zip->getFromIndex($i);
                if ($fileContent !== false) {
                    $finalExtractPath = $tempDir . '/' . $fileName;
                    
                    // Write file content directly to avoid directory structure
                    if (file_put_contents($finalExtractPath, $fileContent) !== false) {
                        // Upload as temp file
                        $tempFileId = $this->uploadExtractedFileAsTemp($finalExtractPath, $fileName, $line, $idUser);
                        if ($tempFileId) {
                            $tempFiles[] = [
                                'original_name' => $fileName,
                                'temp_id' => $tempFileId
                            ];
                        }
                        unlink($finalExtractPath);
                    }
                }
            }
            
            $zip->close();
            $this->removeDirectory($tempDir);
            
            return $tempFiles;
            
        } catch (\Exception $e) {
            return false;
        }
    }
    
    /**
     * Uploads an extracted file as temporary file
     */
    private function uploadExtractedFileAsTemp($filePath, $fileName, $line, $idUser)
    {
        try {
            $extension = strtolower(pathinfo($fileName, PATHINFO_EXTENSION));
            $mimeType = $this->getMimeType($extension);
            
            // Create a temporary uploaded file object
            $tempFile = new \Illuminate\Http\UploadedFile(
                $filePath,
                $fileName,
                $mimeType,
                null,
                true
            );
            
            $request = new Request();
            $request->files->set('file', $tempFile);
            $request->merge([
                'id_user' => $this->encryptionController->encrypt($idUser),
                'linea' => $line
            ]);
            
            $response = $this->documentManagementController->uploadTempFile($request);
            $data = json_decode($response->getContent());
            
            return $data->error ? false : $data->response->idArchivo;
            
        } catch (\Exception $e) {
            return false;
        }
    }
    
    /**
     * Gets MIME type for file extension
     */
    private function getMimeType($extension)
    {
        $mimeTypes = [
            'pdf' => 'application/pdf',
            'doc' => 'application/msword',
            'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
            'xls' => 'application/vnd.ms-excel',
            'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
            'ppt' => 'application/vnd.ms-powerpoint',
            'pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
            'jpg' => 'image/jpeg', 'jpeg' => 'image/jpeg',
            'png' => 'image/png', 'gif' => 'image/gif', 'bmp' => 'image/bmp',
            'txt' => 'text/plain', 'dwg' => 'application/acad', 'dxf' => 'application/dxf'
        ];
        
        return $mimeTypes[$extension] ?? 'application/octet-stream';
    }
    
    /**
     * Recursively removes a directory and its contents
     */
    private function removeDirectory($dir)
    {
        if (!is_dir($dir)) return;
        
        $files = array_diff(scandir($dir), ['.', '..']);
        foreach ($files as $file) {
            $path = $dir . '/' . $file;
            is_dir($path) ? $this->removeDirectory($path) : unlink($path);
        }
        rmdir($dir);
    }

    /**
     * Gets file type based on extension
     */
    private function getFileType($extension){
        $typeMap = [
            'zip' => 'STORAGE', 'rar' => 'STORAGE', 'tar' => 'STORAGE', '7z' => 'STORAGE',
            'mp3' => 'AUDIO', 'mpeg' => 'AUDIO', 'wav' => 'AUDIO', 'ogg' => 'AUDIO', 'opus' => 'AUDIO',
            'jpeg' => 'IMG', 'jpg' => 'IMG', 'png' => 'IMG', 'gif' => 'IMG', 'bmp' => 'IMG', 'tiff' => 'IMG', 'svg' => 'IMG',
            'txt' => 'TEXT',
            'webm' => 'VIDEO', 'mpeg4' => 'VIDEO', 'mp4' => 'VIDEO', '3gpp' => 'VIDEO', 'mov' => 'VIDEO', 'avi' => 'VIDEO', 'wmv' => 'VIDEO', 'flv' => 'VIDEO',
            'dwg' => 'CAD', 'dxf' => 'CAD', '3ds' => '3D', 'ai' => 'ILLUSTRATOR', 'psd' => 'PHOTOSHOP',
            'pdf' => 'PDF', 'xls' => 'EXCEL', 'xlsx' => 'EXCEL', 'ppt' => 'POWERPOINT', 'pptx' => 'POWERPOINT',
            'doc' => 'WORD', 'docx' => 'WORD', 'vsd' => 'VISIO', 'vsdx' => 'VISIO'
        ];
        return $typeMap[$extension] ?? 'UNKNOWN';
    }
}