<?php

namespace App\Services\Account\Photo;

use function Safe\substr;
use Illuminate\Support\Arr;
use Illuminate\Support\Str;
use App\Models\Account\Photo;
use App\Services\BaseService;
use function Safe\finfo_open;
use function Safe\preg_match;
use App\Models\Contact\Contact;
use function Safe\base64_decode;
use Intervention\Image\Facades\Image;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Facades\Validator;
use Intervention\Image\Exception\NotReadableException;

class UploadPhoto extends BaseService
{
    public function __construct()
    {
        Validator::extend('photo', function ($attribute, $value, $parameters, $validator) {
            return $this->isValidPhoto($value);
        });
    }

    /**
     * Get the validation rules that apply to the service.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'account_id' => 'required|integer|exists:accounts,id',
            'contact_id' => 'required|integer|exists:contacts,id',
            'photo' => 'required_without:data|file|image',
            'data' => 'required_without:photo|string|photo',
            'extension' => 'nullable|string',
        ];
    }

    /**
     * Upload a photo.
     *
     * @param array $data
     * @return Photo|null
     */
    public function execute(array $data): ?Photo
    {
        $this->validate($data);

        $contact = Contact::where('account_id', $data['account_id'])
            ->findOrFail($data['contact_id']);

        $array = null;
        if (Arr::has($data, 'photo')) {
            $array = $this->importPhoto($data);
        } else {
            $array = $this->importFile($data);
        }

        if (! $array) {
            return null;
        }

        return tap(Photo::create($array), function ($photo) use ($contact): void {
            $contact->photos()->syncWithoutDetaching([$photo->id]);
        });
    }

    /**
     * Create an array with the necessary fields to create the photo object.
     *
     * @return array
     */
    private function importPhoto($data): array
    {
        $photo = $data['photo'];

        return [
            'account_id' => $data['account_id'],
            'original_filename' => $photo->getClientOriginalName(),
            'filesize' => $photo->getSize(),
            'mime_type' => (new \Mimey\MimeTypes)->getMimeType($photo->guessClientExtension()),
            'new_filename' => $photo->storePublicly('photos', config('filesystems.default')),
        ];
    }

    /**
     * Upload the photo.
     *
     * @return array|null
     */
    private function importFile(array $data): ?array
    {
        $filename = Str::random(40);

        try {
            $image = Image::make($data['data']);
        } catch (NotReadableException $e) {
            return null;
        }

        $tempfile = $this->storeImage('local', $image, 'temp/'.$filename);

        try {
            $storagePath = disk_adapter('local')->getPathPrefix();
            // This sets the basePath to get the filesize later
            $image = $image->setFileInfoFromPath($storagePath.$tempfile);
            $extension = (new \Mimey\MimeTypes)->getExtension($image->mime());
            if (empty($extension)) {
                $extension = str_replace(' ', '', Arr::get($data, 'extension'));
            }
            if (! empty($extension)) {
                $filename .= '.'.$extension;
            }

            $array = [
                'account_id' => $data['account_id'],
                'original_filename' => $filename,
                'filesize' => $image->filesize(),
                'mime_type' => $image->mime(),
            ];

            $array['new_filename'] = $this->storeImage(config('filesystems.default'), $image, 'photos/'.$filename);
        } finally {
            $storage = Storage::disk('local');
            if ($storage->exists($tempfile)) {
                $storage->delete($tempfile);
            }
        }

        return $array;
    }

    /**
     * Store the decoded image in the temp file.
     *
     * @param string $disk
     * @param \Intervention\Image\Image $image
     * @param string $filename
     * @return string|null
     */
    private function storeImage(string $disk, $image, string $filename): ?string
    {
        $result = Storage::disk($disk)
            ->put($path = $filename, (string) $image->stream(), 'public');

        return $result ? $path : null;
    }

    /**
     * Determines if the source photo is a valid encoded photo.
     *
     * @param string $data
     * @return bool
     */
    private function isValidPhoto(string $data): bool
    {
        return $this->isBinary($data) || $this->isDataUrl($data) || $this->isBase64($data);
    }

    /**
     * Determines if source data is binary data.
     *
     * @param string $data
     * @return bool
     */
    private function isBinary(string $data): bool
    {
        $mime = finfo_buffer(finfo_open(FILEINFO_MIME_TYPE), $data);

        return substr($mime, 0, 4) != 'text' && $mime != 'application/x-empty';
    }

    /**
     * Determines if source data is data-url format.
     *
     * @param string $data
     * @return bool
     */
    private function isDataUrl(string $data): bool
    {
        if (! is_string($data)) {
            return false;
        }

        $pattern = "/^data:(?:image\/[a-zA-Z\-\.]+)(?:charset=\".+\")?;base64,(?P<data>.+)$/";
        preg_match($pattern, $data, $matches);

        if (is_array($matches) && Arr::has($matches, 'data')) {
            return ! empty(base64_decode($matches['data']));
        }

        return false;
    }

    /**
     * Determines if source data is base64 encoded.
     *
     * @param string $data
     * @return bool
     */
    private function isBase64(string $data): bool
    {
        if (! is_string($data)) {
            return false;
        }

        return base64_encode(base64_decode($data)) === str_replace(["\n", "\r"], '', $data);
    }
}