<?php

namespace App\Classes\Traits\Repairs;

use Carbon\Carbon;
use Illuminate\Support\Str;
use Intervention\Image\Laravel\Facades\Image;

/**
 * Trait for AttachmentsManager
 */
trait RepairsImages
{
    /**
     * Repair all attached images
     */
    private function repairImages()
    {
        $this->load();

        foreach ($this->manager->get('files', []) as $ref => $data) {
            $this->repairKnownImage($ref, $data);
        }

        $this->save();
    }

    /**
     * Repair a single image. Move it to appropriate directory and create or
     * update variations.
     */
    private function repairKnownImage(string $ref, array $data)
    {
        if (!empty($data['url'])) {
            $data['filename'] = $data['url'];

            unset($data['url']);

            $this->manager->set(sprintf('files.%s', $ref), $data);
        }

        $extension        = pathinfo($data['filename'], PATHINFO_EXTENSION);
        $currentFullPath  = sprintf('%s%s', $this->bundle->getDataDir(), $data['filename']);
        $expectedFullPath = sprintf(
            '%s%s/%s/%s/original.%s',
            $this->bundle->getDataDir(),
            $this->attachmentsDir,
            $this->kind,
            $ref,
            $extension
        );

        if (!$this->disk->exists($currentFullPath)) {
            $this->deleteAttachment($ref);

            return;
        }

        if (empty($data['last_modified'])) {
            $data['last_modified'] = Carbon::parse($this->disk->lastModified($currentFullPath))->toIso8601String();
        }

        if ($currentFullPath !== $expectedFullPath) {
            $filename = pathinfo($currentFullPath, PATHINFO_BASENAME);
            $tempname = Str::random(6);
            $tempPath = str_replace($filename, $tempname, $currentFullPath);

            $this->disk->move($currentFullPath, $tempPath);
            $this->disk->move($tempPath, $expectedFullPath);

            $data['last_modified'] = Carbon::parse($this->disk->lastModified($expectedFullPath))->toIso8601String();
            $data['filename']      = sprintf(
                '%s/%s/%s/original.%s',
                $this->attachmentsDir,
                $this->kind,
                $ref,
                $extension
            );

            $parentDir = dirname($currentFullPath);

            if (empty($this->disk->listContents($parentDir, true))) {
                $this->disk->delete($parentDir);
            }
        }

        $this->manager->set(sprintf('files.%s', $ref), $data);

        $this->syncImageVariants($ref);
    }

    /**
     * Synchronize image variants (apply pre-defined filters)
     */
    private function syncImageVariants(string $ref)
    {
        $currentVariants = $this->manager->get(sprintf('variants.%s', $ref), []);
        $configVariants  = array_keys(config('imagefilters'));

        // Synchronize or delete currently declared variants
        foreach ($currentVariants as $filter => $variantData) {
            if (!in_array($filter, $configVariants)) {
                $this->deleteVariant($ref, $filter);

                continue;
            }

            $this->syncImageVariant($ref, $filter);
        }

        // Synchronize variants with the ones expected by configuration
        foreach ($configVariants as $filter) {
            $this->syncImageVariant($ref, $filter);
        }
    }

    /**
     * Synchronize specific image variant
     */
    private function syncImageVariant(string $ref, string $filter)
    {
        $originalData = $this->getAttachmentData($ref);
        $variantData  = $this->getVariantData($ref, $filter);

        $variantFilepath = $this->getVariantFullPath($ref, $filter);

        if (!$this->disk->exists($variantFilepath)) {
            $this->createImageVariant($ref, $filter);
        } else {
            $originalLastModified = Carbon::parse($originalData['last_modified']);
            $variantLastModified  = Carbon::parse($variantData['last_modified'] ?? $this->disk->lastModified($variantFilepath));

            if ($originalLastModified->gt($variantLastModified)) {
                $this->createImageVariant($ref, $filter);
            }
        }
    }

    /**
     * Create the variant for specified image and filter
     */
    private function createImageVariant(string $ref, string $filter)
    {
        $filterClass = config(sprintf('imagefilters.%s', $filter));
        $original    = $this->getAttachmentFullPath($ref);
        $target      = $this->getVariantFullPath($ref, $filter);
        $contents    = $this->disk->get($original);
        $image       = Image::read($contents);
        $variantData = $this->getVariantData($ref, $filter);

        $image->modify(new $filterClass());

        if ($image->isAnimated()) {
            $contents = (string) $image->toGif();
        } else {
            $contents = (string) $image->toWebp();
        }

        $this->disk->put($target, $contents);

        $variantData['filename']      = $this->getVariantRelativePath($ref, $filter);
        $variantData['last_modified'] = now();

        $this->manager->set(sprintf('variants.%s.%s', $ref, $filter), $variantData);
    }
}