<?php

namespace App\Console\Commands;

use App\Album;
use App\Helpers\ImageHelper;
use App\Helpers\ThemeHelper;
use App\Photo;
use App\Upload;
use App\UploadPhoto;
use Illuminate\Console\Command;

class ProcessUploadCommand extends Command
{
    const METADATA_VERSION = 1;

    /**
     * @var ImageHelper
     */
    private $imageHelper;

    /**
     * @var ThemeHelper
     */
    private $themeHelper;

    /**
     * The name and signature of the console command.
     *
     * @var string
     */
    protected $signature = 'twilight:process-uploads';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = 'Processes uploads made through the web application.';

    /**
     * Create a new command instance.
     *
     * @return void
     */
    public function __construct(ImageHelper $imageHelper, ThemeHelper $themeHelper)
    {
        parent::__construct();

        $this->imageHelper = $imageHelper;
        $this->themeHelper = $themeHelper;
    }

    /**
     * Execute the console command.
     *
     * @return mixed
     */
    public function handle()
    {
        $uploadsToProcess = Upload::where([
            ['is_completed', false],
            ['is_processing', false],
            ['is_ready', true]
        ])
            ->orderBy('created_at')
            ->get();

        /** @var Upload $upload */
        foreach ($uploadsToProcess as $upload)
        {
            $upload->is_processing = 1;
            $upload->save();

            $this->output->writeln(sprintf('Processing upload #%d', $upload->id));
            $this->handleUpload($upload);

            $upload->is_completed = 1;
            $upload->is_processing = 0;
            $upload->save();
        }
    }

    private function handleUpload(Upload $upload)
    {
        $photos = $upload->uploadPhotos;

        /** @var UploadPhoto $photo */
        foreach ($photos as $photo)
        {
            try
            {
                $this->handlePhoto($photo);
                $upload->number_successful++;
            }
            catch (\Exception $ex)
            {
                $upload->number_failed++;
                $photo->photo->delete();
                $photo->delete();
            }

            $upload->save();
        }
    }

    private function handlePhoto(UploadPhoto $uploadPhoto)
    {
        /** @var Photo $photo */
        $photo = $uploadPhoto->photo;

        /** @var Album $album */
        $album = $photo->album;
        $albumSource = $album->getAlbumSource();

        $photoFile = $albumSource->getPathToPhoto($album, $photo);

        // Read and analyse Exif data
        $this->output->writeln(sprintf('Analysing photo #%d: %s', $photo->id, $photo->name));

        // Open the photo
        $imageInfo = null;
        $originalPhotoResource = $this->imageHelper->openImage($photoFile, $imageInfo);
        $photo->width = $imageInfo[0];
        $photo->height = $imageInfo[1];
        $photo->mime_type = $imageInfo['mime'];

        // Read the Exif data
        $exifData = @exif_read_data($photoFile);
        $isExifDataFound = ($exifData !== false && is_array($exifData));
        $angleToRotate = 0;

        if ($isExifDataFound && isset($exifData['Orientation']))
        {
            switch ($exifData['Orientation'])
            {
                case 3:
                    $angleToRotate = 180;
                    break;

                case 6:
                    $angleToRotate = 270;
                    break;

                case 8:
                    $angleToRotate = 90;
                    break;
            }

            if ($angleToRotate > 0)
            {
                $originalPhotoResource = $this->imageHelper->rotateImage($originalPhotoResource, $angleToRotate);

                if ($angleToRotate == 90 || $angleToRotate == 270)
                {
                    $photo->width = $imageInfo[1];
                    $photo->height = $imageInfo[0];
                }
            }
        }

        if ($isExifDataFound)
        {
            $photo->metadata_version = ProcessUploadCommand::METADATA_VERSION;
            $photo->taken_at = $this->metadataDateTime($exifData);
            $photo->camera_make = $this->metadataCameraMake($exifData);
            $photo->camera_model = $this->metadataCameraModel($exifData);
            $photo->camera_software = $this->metadataCameraSoftware($exifData);
            $photo->rotation = $angleToRotate;
        }

        $photo->save();

        // Generate and save thumbnails
        $this->output->writeln('Generating thumbnails');
        $themeInfo = $this->themeHelper->info();
        $thumbnailsRequired = $themeInfo['thumbnails'];

        /** @var mixed $thumbnail */
        foreach ($thumbnailsRequired as $thumbnail)
        {
            $generatedThumbnailPath = $this->imageHelper->generateThumbnail($originalPhotoResource, $photo, $thumbnail);
            $albumSource->saveThumbnail($album, $photo, $thumbnail, $generatedThumbnailPath);

            $this->output->writeln(sprintf('Thumbnail \'%s\' (%dx%d) created', $thumbnail['name'], $thumbnail['width'], $thumbnail['height']));
        }
    }

    private function metadataCameraMake(array $exifData)
    {
        if (isset($exifData['Make']))
        {
            return $exifData['Make'];
        }

        return null;
    }

    private function metadataCameraModel(array $exifData)
    {
        if (isset($exifData['Model']))
        {
            return $exifData['Model'];
        }

        return null;
    }

    private function metadataCameraSoftware(array $exifData)
    {
        if (isset($exifData['Software']))
        {
            return $exifData['Software'];
        }

        return null;
    }

    private function metadataDateTime(array $exifData)
    {
        $dateTime = null;
        if (isset($exifData['DateTime']))
        {
            $dateTime = $exifData['DateTime'];
        }

        if (!is_null($dateTime))
        {
            $dateTime = preg_replace('/^([\d]{4}):([\d]{2}):([\d]{2})/', '$1-$2-$3', $dateTime);
        }

        return $dateTime;
    }
}