<?php

namespace App\Repositories\DC;


use App\Models\DcFile;
use App\Services\Util;
use App\Models\DcFileTag;
use App\Repositories\BaseRepository;
use Intervention\Image\ImageManager;
use Imagick;
use ImagickException;

class FileRepository extends BaseRepository {

    private const ALLOWED_IMAGE_TYPES = [
        'image/jpeg',
        'image/gif',
        'image/png'
    ];
    
    private const ALLOWED_PDF_TYPES = [
        'application/pdf'
    ];

    private const THUMB_WIDTH = 542;
    private const THUMB_HEIGHT = 360;
    private const BIG_WIDTH = 1600;
    private const BIG_HEIGHT = 900;

    public function uploadFile(array $form_data): DcFile
    {
        if (!isset($form_data['file']) || !$form_data['file']->isValid()) {
            throw new \InvalidArgumentException('Invalid file provided');
        }
        $file = $form_data['file'];
        $originalName = $file->getClientOriginalName();
        $extension = $file->getClientOriginalExtension();
        $mine = $file->getClientMimeType();
        $size = $file->getSize();

        $originalNameWithoutExt = substr($originalName, 0, strlen($originalName) - strlen($extension) - 1);
        $filename = Util::sanitize($originalNameWithoutExt, true, false, true);
        $allowed_filename = uniqid() . '_' . $filename.".".$extension;
        $file->storeAs('dc/files', $allowed_filename, 'public');
        // $store = $file->store('files/');

        $dc_file = DcFile::create([
            'filename' => $allowed_filename,
            'original_name' => $originalName,
            'ext' => $extension,
            'mine' => $mine,
            'size' => $size
        ]);
        $this->makeThumbFromFile($dc_file);
        return $dc_file;
    }
    
    public function makeThumb(int $id): bool
    {
        $file = DcFile::findOrFail($id);
        $this->makeThumbFromFile($file);
        return true;
    }

    public function makeThumbFromFile(DcFile $file): bool
    {
        try {
            $path = $file->getFile(true);   
            if (!file_exists($path)) {
                throw new \Exception('File not found');
            }
            
            $filename = $file->filename;
            $mime = \File::mimeType($path);

            if (in_array($mime, self::ALLOWED_IMAGE_TYPES)) {
                $this->processImage($path, $filename);
            } elseif (in_array($mime, self::ALLOWED_PDF_TYPES)) {
                $this->processPdf($path, $filename);
            }

            return true;
        } catch (\Exception $e) {
            \Log::error('Thumbnail creation failed: ' . $e->getMessage());
            return false;
        }
    }

    private function processImage(string $path, string $filename): void
    {
        // ImageManager initialisieren (standardmäßig mit GD)
        $manager = ImageManager::gd();

        // Thumbnail
        $thumbImage = $manager->read($path);
        $thumbImage->scaleDown(width: self::THUMB_WIDTH, height: self::THUMB_HEIGHT);
        \Storage::disk('public')->put('dc/thumb/'.basename($filename), (string) $thumbImage->toJpeg());

        // Big image
        $bigImage = $manager->read($path);
        $bigImage->scaleDown(width: self::BIG_WIDTH, height: self::BIG_HEIGHT);
        \Storage::disk('public')->put('dc/big/'.basename($filename), (string) $bigImage->toJpeg());

        // Ressourcen freigeben nicht mehr nötig in v3
        // $thumbImage->destroy();
        // $bigImage->destroy();
    }

    private function processPdf(string $path, string $filename): void
    {
        try {
            // PDF mit höherer Auflösung rendern
            $imagick = new \Imagick();
            $imagick->setResolution(300, 300);
            $imagick->readImage($path.'[0]');
            
            // Grundlegende Bildoptimierungen
            $imagick->setImageBackgroundColor('#ffffff');
            $imagick->mergeImageLayers(\Imagick::LAYERMETHOD_FLATTEN);
            $imagick->setImageFormat('jpg');
            $imagick->setImageCompression(\Imagick::COMPRESSION_JPEG);
            $imagick->setImageCompressionQuality(80);
            
            // Große Version erstellen
            $bigImage = clone $imagick;
            $bigImage->resizeImage(self::BIG_WIDTH, self::BIG_HEIGHT, \Imagick::FILTER_LANCZOS, 1, true);
            $bigImage->writeImage(\Storage::disk('public')->path('dc/big/').basename($filename).'.jpg');
            $bigImage->clear();
            
            // Thumbnail erstellen
            $imagick->resizeImage(self::THUMB_WIDTH, self::THUMB_HEIGHT, \Imagick::FILTER_LANCZOS, 1, true);
            $imagick->writeImage(\Storage::disk('public')->path('dc/thumb/').basename($filename).'.jpg');
            
            // Ressourcen freigeben
            $imagick->clear();
        } catch (\ImagickException $e) {
            \Log::error('PDF Verarbeitung fehlgeschlagen: ' . $e->getMessage());
            throw new \RuntimeException('PDF Verarbeitung fehlgeschlagen: ' . $e->getMessage());
        } finally {
            if (isset($bigImage)) {
                $bigImage->destroy();
            }
            if (isset($imagick)) {
                $imagick->destroy();
            }
        }
    }

    public function tagsUpdate($id, array $tags = []): bool
    {
        $file = DcFile::findOrFail($id);
        
        // Get existing tags
        $existingTags = DcFileTag::where('file_id', $file->id)
            ->pluck('tag_id')
            ->toArray();

        // Delete removed tags
        $tagsToDelete = array_diff($existingTags, $tags);
        if (!empty($tagsToDelete)) {
            DcFileTag::where('file_id', $file->id)
                ->whereIn('tag_id', $tagsToDelete)
                ->delete();
        }

        // Add new tags
        $tagsToAdd = array_diff($tags, $existingTags);
        $newTags = [];
        foreach ($tagsToAdd as $tagId) {
            $newTags[] = [
                'file_id' => $file->id,
                'tag_id' => $tagId
            ];
        }
        
        if (!empty($newTags)) {
            DcFileTag::insert($newTags);
        }

        return true;
    }

    private function deleteFileIfExists(string $path): void
    {
        if (file_exists($path)) {
            unlink($path);
        }
    }

    public function deleteThumb($id): bool
    {
        try {
            $file = DcFile::findOrFail($id);
            $this->deleteFileIfExists($file->getThumb(true));
            $this->deleteFileIfExists($file->getBig(true));
            return true;
        } catch (\Exception $e) {
            \Log::error('Thumbnail deletion failed: ' . $e->getMessage());
            return false;
        }
    }

    public function deleteFile(int $id): bool
    {
        try {
            $file = DcFile::findOrFail($id);
            $this->deleteFileIfExists($file->getThumb(true));
            $this->deleteFileIfExists($file->getBig(true));
            $this->deleteFileIfExists($file->getFile(true));
            $file->delete();
            return true;
        } catch (\Exception $e) {
            \Log::error('File deletion failed: ' . $e->getMessage());
            return false;
        }
    }

}