<?php

namespace App\Http\Controllers\Admin;

use App\Album;
use App\Facade\UserConfig;
use App\Helpers\AnalysisQueueHelper;
use App\Helpers\FileHelper;
use App\Helpers\MiscHelper;
use App\Http\Controllers\Controller;
use App\Http\Requests\UpdatePhotosBulkRequest;
use App\Photo;
use App\QueueItem;
use App\Services\PhotoService;
use App\Services\RabbitMQService;
use App\Upload;
use App\UploadPhoto;
use App\UserActivity;
use Illuminate\Http\Request;
use Illuminate\Http\UploadedFile;
use Illuminate\Support\Facades\App;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\View;
use Symfony\Component\HttpFoundation\File\File;

class PhotoController extends Controller
{
    public function __construct()
    {
        $this->middleware(['auth', 'max_post_size_exceeded']);
        View::share('is_admin', true);
    }

    public function analyse($photoId, $queue_token)
    {
        $this->authorizeAccessToAdminPanel();

        /** @var Photo $photo */
        $photo = Photo::where('id', intval($photoId))->first();
        if (is_null($photo))
        {
            App::abort(404);
            return null;
        }

        $result = ['is_successful' => false, 'message' => ''];

        try
        {
            if (UserConfig::isImageProcessingQueueEnabled())
            {
                // Find the last record that is analysing this photo
                $photoQueueItem = QueueItem::where('photo_id', $photo->id)
                    ->orderBy('queued_at', 'desc')
                    ->limit(1)
                    ->first();

                $timeToWait = 60;
                $timeWaited = 0;
                $continueToMonitor = true;

                while ($continueToMonitor && $timeWaited < $timeToWait)
                {
                    $continueToMonitor = is_null($photoQueueItem->completed_at);
                    if ($continueToMonitor)
                    {
                        sleep(1);
                        $timeWaited++;

                        $photoQueueItem = QueueItem::where('id', $photoQueueItem->id)->first();
                        $continueToMonitor = is_null($photoQueueItem->completed_at);
                    }
                }

                $didComplete = !is_null($photoQueueItem->completed_at);
                if (!$didComplete)
                {
                    $result['message'] = 'Timed out waiting for queue processing.';
                }
                else if (!$photoQueueItem->is_successful)
                {
                    $result['is_successful'] = false;
                    $result['message'] = $photoQueueItem->error_message;

                    // Remove the photo from the album if it was newly-uploaded and couldn't be processed
                    if (intval($photo->metadata_version) === 0)
                    {
                        $photo->delete();
                    }
                }
                else
                {
                    $result['is_successful'] = true;
                }
            }
            else
            {
                /* IF CHANGING THIS LOGIC, ALSO CHECK ProcessQueueCommand::processPhotoAnalyseMessage */
                $photoService = new PhotoService($photo);
                $photoService->analyse($queue_token);

                // Log an activity record for the user's feed (remove an existing one as the date may have changed)
                $this->removeExistingActivityRecords($photo, 'photo.taken');

                if (!is_null($photo->taken_at))
                {
                    // Log an activity record for the user's feed
                    $this->createActivityRecord($photo, 'photo.taken', $photo->taken_at);
                }

                $result['is_successful'] = true;
            }
        }
        catch (\Exception $ex)
        {
            $result['is_successful'] = false;
            $result['message'] = $ex->getMessage();

            // Remove the photo if it cannot be analysed (only if there isn't currently a version of metadata)
            $photo->delete();
        }

        return response()->json($result);
    }

    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
        //
    }

    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function create()
    {
        //
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function destroy(Request $request, $id)
    {
        $this->authorizeAccessToAdminPanel();

        $photo = $this->loadPhoto($id, 'delete');

        $photoService = new PhotoService($photo);
        $photoService->delete();

        $request->session()->flash('success', trans('admin.delete_photo_successful_message', ['name' => $photo->name]));
    }

    public function flip($photoId, $horizontal, $vertical)
    {
        $this->authorizeAccessToAdminPanel();

        settype($horizontal, 'boolean');
        settype($vertical, 'boolean');

        $photo = $this->loadPhoto($photoId, 'manipulate');

        $photoService = new PhotoService($photo);
        $photoService->flip($horizontal, $vertical);

        // Log an activity record for the user's feed
        $this->createActivityRecord($photo, 'photo.edited');
    }

    public function move(Request $request, $photoId)
    {
        $this->authorizeAccessToAdminPanel();

        $photo = $this->loadPhoto($photoId, 'manipulate');

        $newAlbum = Album::where('id', intval($request->get('new_album_id')))->first();
        if (is_null($newAlbum))
        {
            App::abort(404);
        }

        $messageData = ['name' => $photo->name, 'album' => $newAlbum->name];

        if ($newAlbum->id == $photo->album_id)
        {
            $request->session()->flash('warning', trans('admin.move_failed_same_album', $messageData));
        }
        else
        {
            $photoService = new PhotoService($photo);
            $photoService->changeAlbum($newAlbum);

            $request->session()->flash('success', trans('admin.move_successful_message', $messageData));
        }
    }

    public function reAnalyse($id, $queue_token)
    {
        $this->authorizeAccessToAdminPanel();

        /** @var Photo $photo */
        $photo = $this->loadPhoto($id);
        $result = ['is_successful' => false, 'message' => ''];

        try
        {
            $photoService = new PhotoService($photo);
            $photoService->downloadOriginalToFolder(FileHelper::getQueuePath($queue_token));
            $photoService->analyse($queue_token);

            // Log an activity record for the user's feed (remove an existing one as the date may have changed)
            $this->removeExistingActivityRecords($photo, 'photo.taken');

            if (!is_null($photo->taken_at))
            {
                // Log an activity record for the user's feed
                $this->createActivityRecord($photo, 'photo.taken', $photo->taken_at);
            }

            $result['is_successful'] = true;
        }
        catch (\Exception $ex)
        {
            $result['is_successful'] = false;
            $result['message'] = $ex->getMessage();

            // Unlike the analyse method, we don't remove the photo if it cannot be analysed
        }

        return response()->json($result);
    }

    public function regenerateThumbnails($photoId)
    {
        $this->authorizeAccessToAdminPanel();

        $photo = $this->loadPhoto($photoId, 'change-metadata');

        $result = ['is_successful' => false, 'message' => ''];

        try
        {
            $photoService = new PhotoService($photo);
            $photoService->regenerateThumbnails();

            $result['is_successful'] = true;
        }
        catch (\Exception $ex)
        {
            $result['is_successful'] = false;
            $result['message'] = $ex->getMessage();
        }

        return response()->json($result);
    }

    public function rotate($photoId, $angle)
    {
        $this->authorizeAccessToAdminPanel();

        $photo = $this->loadPhoto($photoId, 'manipulate');

        if ($angle != 90 && $angle != 180 && $angle != 270)
        {
            App::aport(400);
            return null;
        }

        $photoService = new PhotoService($photo);
        $photoService->rotate($angle);

        // Log an activity record for the user's feed
        $this->createActivityRecord($photo, 'photo.edited');
    }

    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(Request $request)
    {
        $this->authorizeAccessToAdminPanel();

        $photoFiles = $request->files->get('photo');

        // Load the linked album
        $album = $this->loadAlbum($request->get('album_id'), 'upload-photos');
        $isSuccessful = false;

        // Create the folder to hold the analysis results if not already present
        $queueUid = $request->get('queue_token');
        if (strlen($queueUid) == 0)
        {
            throw new \Exception('No queue_token value was provided!');
        }

        $queueStorage = AnalysisQueueHelper::getStorageQueueSource();

        foreach ($photoFiles as $photoFile)
        {
            $photoFile = UploadedFile::createFromBase($photoFile);
            if ($photoFile->getError() != UPLOAD_ERR_OK)
            {
                Log::error('Image upload failed.', ['error' => $photoFile->getError(), 'reason' => $photoFile->getErrorMessage()]);
            }
            else
            {
                if ($request->has('photo_id'))
                {
                    // Photo ID provided (using the Replace Photo function) - use that record
                    $photo = Photo::where('id', intval($request->get('photo_id')))->first();
                    $photo->raw_exif_data = null;

                    $queuedFileName = $queueStorage->uploadToAnalysisQueue($photoFile, $queueUid, $photo->storage_file_name);
                    $uploadedTempFile = new File($photoFile);

                    $this->removeExistingActivityRecords($photo, 'photo.uploaded');
                    $this->removeExistingActivityRecords($photo, 'photo.taken');

                    $photo->file_name = $photoFile->getClientOriginalName();
                    $photo->mime_type = $uploadedTempFile->getMimeType();
                    $photo->file_size = $uploadedTempFile->getSize();
                    $photo->storage_file_name = basename($queuedFileName);
                }
                else
                {
                    $queuedFileName = $queueStorage->uploadToAnalysisQueue($photoFile, $queueUid);
                    $uploadedTempFile = new File($photoFile);

                    $photo = new Photo();
                    $photo->album_id = $album->id;
                    $photo->user_id = Auth::user()->id;
                    $photo->name = pathinfo($photoFile->getClientOriginalName(), PATHINFO_FILENAME);

                    $photo->file_name = $photoFile->getClientOriginalName();
                    $photo->mime_type = $uploadedTempFile->getMimeType();
                    $photo->file_size = $uploadedTempFile->getSize();
                    $photo->storage_file_name = basename($queuedFileName);
                }

                $photo->is_analysed = false;
                $photo->save();

                // Log an activity record for the user's feed
                $this->createActivityRecord($photo, 'photo.uploaded');

                // If queueing is enabled, store the photo in the queue now
                if (UserConfig::isImageProcessingQueueEnabled())
                {
                    $queueItem = new QueueItem([
                        'batch_reference' => $queueUid,
                        'action_type' => 'photo.analyse',
                        'album_id' => $photo->album_id,
                        'photo_id' => $photo->id,
                        'user_id' => $this->getUser()->id,
                        'queued_at' => new \DateTime()
                    ]);
                    $queueItem->save();

                    $rabbitmq = new RabbitMQService();
                    $rabbitmq->queueItem($queueItem);
                }

                $isSuccessful = true;
            }
        }

        if ($request->isXmlHttpRequest())
        {
            return response()->json(['is_successful' => $isSuccessful]);
        }
        else
        {
            return redirect(route('albums.analyse', [
                'id' => $album->id,
                'queue_token' => $queueUid
            ]));
        }
    }

    public function storeBulk(Request $request)
    {
        $this->authorizeAccessToAdminPanel();

        // Load the linked album
        $album = $this->loadAlbum($request->get('album_id'));

        if (is_null($request->files->get('archive')))
        {
            $request->session()->flash('error', trans('admin.upload_bulk_no_file'));
            return redirect(route('albums.show', ['id' => $album->id]));
        }

        $archiveFile = UploadedFile::createFromBase($request->files->get('archive'));
        if ($archiveFile->getError() != UPLOAD_ERR_OK)
        {
            Log::error('Bulk image upload failed.', ['error' => $archiveFile->getError(), 'reason' => $archiveFile->getErrorMessage()]);
            $request->session()->flash('error', $archiveFile->getErrorMessage());
            return redirect(route('albums.show', ['id' => $album->id]));
        }

        // Create the folder to hold the analysis results if not already present
        $queueUid = $request->get('queue_token');
        if (strlen($queueUid) == 0)
        {
            throw new \Exception('No queue_token value was provided!');
        }

        $temporaryFolder = sprintf('%s/%s', sys_get_temp_dir(), MiscHelper::randomString());
        @mkdir($temporaryFolder);

        $queueStorage = AnalysisQueueHelper::getStorageQueueSource();

        $mimeType = strtolower($archiveFile->getMimeType());
        switch ($mimeType)
        {
            case 'application/zip':
                $zip = new \ZipArchive();
                $zip->open($archiveFile->getPathname());
                $zip->extractTo($temporaryFolder);
                $zip->close();
                @unlink($archiveFile->getPathname());
                break;

            default:
                $request->session()->flash('error', sprintf('The file type "%s" is not supported for bulk uploads.', $mimeType));
                return redirect(route('albums.show', ['id' => $album->id]));
        }

        $di = new \RecursiveDirectoryIterator($temporaryFolder, \RecursiveDirectoryIterator::SKIP_DOTS);
        $recursive = new \RecursiveIteratorIterator($di);

        /** @var \SplFileInfo $fileInfo */
        foreach ($recursive as $fileInfo)
        {
            if ($fileInfo->isDir())
            {
                if ($fileInfo->getFilename() == '__MACOSX' || substr($fileInfo->getFilename(), 0, 1) == '.')
                {
                    @rmdir($fileInfo->getPathname());
                }

                continue;
            }

            if (substr($fileInfo->getFilename(), 0, 1) == '.')
            {
                // Temporary/hidden file - skip
                @unlink($fileInfo->getPathname());
                continue;
            }

            $result = getimagesize($fileInfo->getPathname());
            if ($result === false)
            {
                // Not an image file - skip
                @unlink($fileInfo->getPathname());
                continue;
            }

            $photoFile = new File($fileInfo->getPathname());
            $queuedFileName = $queueStorage->uploadToAnalysisQueue($photoFile, $queueUid);

            $photo = new Photo();
            $photo->album_id = $album->id;
            $photo->user_id = Auth::user()->id;
            $photo->name = pathinfo($photoFile->getFilename(), PATHINFO_FILENAME);
            $photo->file_name = $photoFile->getFilename();
            $photo->mime_type = $photoFile->getMimeType();
            $photo->file_size = $photoFile->getSize();
            $photo->is_analysed = false;
            $photo->storage_file_name = basename($queuedFileName);
            $photo->save();

            // Log an activity record for the user's feed
            $this->createActivityRecord($photo, 'photo.uploaded');

            // If queueing is enabled, store the photo in the queue now
            if (UserConfig::isImageProcessingQueueEnabled())
            {
                $queueItem = new QueueItem([
                    'batch_reference' => $queueUid,
                    'action_type' => 'photo.analyse',
                    'album_id' => $photo->album_id,
                    'photo_id' => $photo->id,
                    'user_id' => $this->getUser()->id,
                    'queued_at' => new \DateTime()
                ]);
                $queueItem->save();

                $rabbitmq = new RabbitMQService();
                $rabbitmq->queueItem($queueItem);
            }
        }

        return redirect(route('albums.analyse', [
            'id' => $album->id,
            'queue_token' => $queueUid
        ]));
    }

    /**
     * Display the specified resource.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function show($id)
    {
        //
    }

    /**
     * Show the form for editing the specified resource.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function edit($id)
    {
        //
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function update(Request $request, $id)
    {
        //
    }

    public function updateBulk(UpdatePhotosBulkRequest $request, $albumId)
    {
        $this->authorizeAccessToAdminPanel();

        $album = $this->loadAlbum($albumId);

        if ($request->has('bulk-apply'))
        {
            $numberChanged = $this->applyBulkActions($request, $album);
        }
        else
        {
            $numberChanged = $this->updatePhotoDetails($request, $album);
        }

        $request->session()->flash(
            'success',
            trans_choice(
                UserConfig::isImageProcessingQueueEnabled() ? 'admin.bulk_photos_changed_queued' : 'admin.bulk_photos_changed',
                $numberChanged,
                ['number' => $numberChanged]
            )
        );

        return redirect(route('albums.show', array('id' => $albumId, 'page' => $request->get('page', 1))));
    }

    private function applyBulkActions(Request $request, Album $album)
    {
        $selectAllInAlbum = boolval($request->get('select-all-album'));
        $photosToProcess = [];

        if ($selectAllInAlbum)
        {
            foreach ($album->photos as $photo)
            {
                $photosToProcess[] = $photo;
            }
        }
        else
        {
            $photoIds = $request->get('select-photo');
            if (is_null($photoIds) || !is_array($photoIds) || count($photoIds) == 0)
            {
                $request->session()->flash('warning', trans('admin.no_photo_selected_message'));
                return 0;
            }

            foreach ($photoIds as $photoId)
            {
                /** @var Photo $photo */
                $photo = $album->photos()->where('id', intval($photoId))->first();
                if (is_null($photo))
                {
                    continue;
                }

                $photosToProcess[] = $photo;
            }
        }

        $action = $request->get('bulk-action');
        $numberChanged = 0;

        if (UserConfig::isImageProcessingQueueEnabled())
        {
            $queueUid = MiscHelper::randomString();

            foreach ($photosToProcess as $photo)
            {
                $queueItem = new QueueItem([
                    'batch_reference' => $queueUid,
                    'action_type' => sprintf('photo.bulk_action.%s', strtolower($action)),
                    'album_id' => $photo->album_id,
                    'photo_id' => $photo->id,
                    'user_id' => $this->getUser()->id,
                    'queued_at' => new \DateTime()
                ]);

                if (strtolower($action) == 'change_album')
                {
                    $queueItem->new_album_id = intval($request->get('new-album-id'));
                    $newAlbumId = intval($request->get('new-album-id'));
                    if ($newAlbumId == $photo->album_id)
                    {
                        // Photo already belongs to this album, don't move
                        continue;
                    }
                }

                $queueItem->save();

                $rabbitmq = new RabbitMQService();
                $rabbitmq->queueItem($queueItem);

                $numberChanged++;
            }
        }
        else
        {
            foreach ($photosToProcess as $photo)
            {
                $changed = false;
                $photoService = new PhotoService($photo);
                $doNotSave = false;

                /* IF CHANGING THIS LOGIC OR ADDING EXTRA case OPTIONS, ALSO CHECK ProcessQueueCommand::processQueueItem AND ProcessQueueCommand::processPhotoBulkActionMessage */
                switch (strtolower($action))
                {
                    case 'change_album':
                        if (Auth::user()->can('change-metadata', $photo))
                        {
                            $newAlbumId = intval($request->get('new-album-id'));
                            if ($newAlbumId == $photo->album_id)
                            {
                                // Photo already belongs to this album, don't move
                                continue 2;
                            }

                            $newAlbum = $this->loadAlbum($newAlbumId, 'upload-photos');
                            $photoService->changeAlbum($newAlbum);
                            $changed = true;
                        }
                        break;

                    case 'delete':
                        if (Auth::user()->can('delete', $photo))
                        {
                            $photoService->delete();
                            $doNotSave = true;
                            $changed = true;
                        }
                        break;

                    case 'flip_both':
                        if (Auth::user()->can('manipulate', $photo))
                        {
                            $photoService->flip(true, true);
                            $changed = true;
                        }
                        break;

                    case 'flip_horizontal':
                        if (Auth::user()->can('manipulate', $photo))
                        {
                            $photoService->flip(true, false);
                            $changed = true;
                        }
                        break;

                    case 'flip_vertical':
                        if (Auth::user()->can('manipulate', $photo))
                        {
                            $photoService->flip(false, true);
                            $changed = true;
                        }
                        break;

                    case 'refresh_thumbnails':
                        if (Auth::user()->can('change-metadata', $photo))
                        {
                            $photoService->regenerateThumbnails();
                            $changed = true;
                        }
                        break;

                    case 'rotate_left':
                        if (Auth::user()->can('manipulate', $photo))
                        {
                            $photoService->rotate(90);
                            $changed = true;
                        }
                        break;

                    case 'rotate_right':
                        if (Auth::user()->can('manipulate', $photo))
                        {
                            $photoService->rotate(270);
                            $changed = true;
                        }
                        break;
                }

                if (!$doNotSave)
                {
                    $photo->save();
                }

                if (!in_array(strtolower($action), ['delete', 'refresh_thumbnails', 'change_album']))
                {
                    // Log an activity record for the user's feed
                    $this->createActivityRecord($photo, 'photo.edited');
                }

                if ($changed)
                {
                    $numberChanged++;
                }
            }
        }

        return $numberChanged;
    }

    private function createActivityRecord(Photo $photo, $type, $activityDateTime = null)
    {
        if (is_null($activityDateTime))
        {
            $activityDateTime = new \DateTime();
        }

        $userActivity = new UserActivity();
        $userActivity->user_id = $this->getUser()->id;
        $userActivity->activity_at = $activityDateTime;
        $userActivity->type = $type;
        $userActivity->photo_id = $photo->id;
        $userActivity->save();
    }

    /**
     * @param $id
     * @return Album
     */
    private function loadAlbum($id, $permission = 'edit')
    {
        $album = Album::where('id', intval($id))->first();
        if (is_null($album))
        {
            App::abort(404);
            return null;
        }

        $this->authorize($permission, $album);

        return $album;
    }

    /**
     * @param $id
     * @param string|null $permission
     * @return Photo
     */
    private function loadPhoto($id, $permission = null)
    {
        $photo = Photo::where('id', intval($id))->first();
        if (is_null($photo))
        {
            App::abort(404);
            return null;
        }

        if (!is_null($permission))
        {
            $this->authorize($permission, $photo);
        }

        return $photo;
    }

    private function removeExistingActivityRecords(Photo $photo, $type)
    {
        $existingFeedRecords = UserActivity::where([
            'user_id' => $this->getUser()->id,
            'photo_id' => $photo->id,
            'type' => $type
        ])->get();

        foreach ($existingFeedRecords as $existingFeedRecord)
        {
            $existingFeedRecord->delete();
        }
    }

    private function updatePhotoDetails(Request $request, Album $album)
    {
        $numberChanged = 0;
        $photos = $request->get('photo');

        foreach ($photos as $photoId => $value)
        {
            /** @var Photo $photo */
            $photo = $album->photos()->where('id', intval($photoId))->first();
            if (is_null($photo) || !Auth::user()->can('change-metadata', $photo))
            {
                continue;
            }

            $photo->fill($value);

            // Update the photo labels
            $labelString = trim($value['labels']);
            $photo->labels()->detach();

            if (strlen($labelString) > 0)
            {
                app(LabelController::class)->applyLabelsToPhoto($photo, $labelString);
            }

            // Save all changes
            $photo->save();
            $numberChanged++;
        }

        return $numberChanged;
    }
}