<?php

namespace App\SearchDisplace\Ingest;

use App\Events\IngestDocumentReceived;
use App\Events\SDAppliedOnOriginalDocument;
use App\SearchDisplace\SearchAndDisplaceOriginalDocument;
use GuzzleHttp\Client;
use GuzzleHttp\Exception\ClientException;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Storage;

class HandleReceivedDocument
{
    protected $id;
    protected $content;
    protected $fileResultType;
    protected $documentFormat;
    protected $status;

    public function __construct($payload)
    {
        $this->id = $payload['data']['id'];
        $this->content = $payload['data']['content'];
        $this->fileResultType = $payload['data']['file_result_type'];
        $this->status = $payload['data']['status'];

        if (isset($payload['data']['document_format'])) {
            $this->documentFormat = $payload['data']['document_format'];
        }
    }

    /**
     * @throws \Exception|\GuzzleHttp\Exception\GuzzleException
     */
    public function handle()
    {
        if ($this->fileResultType === 'md') {
            $this->handleDocumentMD();

            return;
        }

        if ($this->fileResultType === 'document-recreated') {
            $this->downloadDocumentFromIngest();

            return;
        }

        $this->handleDocumentJson();
    }

    protected function handleDocumentMD()
    {
        $storage = Storage::disk('local');

        $fileName = 'document';

        // The .md extension signals the success status, the lack of signals the fail status.
        if ($this->status === 'success') {
            $fileName = $fileName . '.md';
        }

        $dir = "contracts/$this->id";

        try {
            $storage->makeDirectory($dir);

            $storage->put("$dir/$fileName", $this->content['document']);

            foreach ($this->content['images'] as $image) {
                $name = $image['name'];
                $type = $image['type'];

                $contents = $image['contents'];
                $contents = str_replace('data:image/' . $type . ';base64,', '', $contents);

                $storage->put("$dir/$name.$type", base64_decode($contents));
            }

            // Emit event so other sections of the app can work on it.
            IngestDocumentReceived::dispatch($this->id);
        } catch (\Exception $exception) {
            \Illuminate\Support\Facades\Log::info('Exception: ' . $exception->getTraceAsString());
        }
    }

    /**
     * @throws \Exception|\GuzzleHttp\Exception\GuzzleException
     */
    protected function downloadDocumentFromIngest()
    {
        $storage = Storage::disk('local');

        if ($this->status === 'fail') {
            $storage->deleteDirectory("contracts/$this->id");

            return;
        }

        if ( ! $this->documentFormat) {
            throw new \Exception('No document format specified.');
        }

        $filePath = "document.$this->documentFormat";

        $storeDocumentAtPath = $storage->path('contracts/' . $this->id . '-' . $filePath);

        try {
            // Change the path where to store the document if the operation was run from CLI.
            $storeAtPathFromJsonFile = (new SearchAndDisplaceOriginalDocument())->getStoreAtPathFromJsonFile($this->id);

            if ($storeAtPathFromJsonFile) {
                $storeDocumentAtPath = $storeAtPathFromJsonFile .
                    '/' .
                    $this->id .
                    '-displaced.' .
                    $this->documentFormat;
            }
        } catch (\Exception $exception) {
            \Illuminate\Support\Facades\Log::info('Exception thrown when tried reading the storeDocumentAtPath from JSON file.');
        }

        $client = new Client();
        $url = env('SD_INGEST_URL') . '/recreate-document/' . $this->id . '?file_path=' . $filePath;

        try {
            $client->request('GET', $url, [
                'sink' => $storeDocumentAtPath,
            ]);
        } catch (ClientException $clientException) {
            $error = json_decode($clientException->getResponse()->getBody()->getContents(), true);

            throw new \Exception($error['message']);
        } finally {
            $storage->deleteDirectory("contracts/$this->id");
        }

        SDAppliedOnOriginalDocument::dispatch($this->id);
    }

    /**
     * @throws \Exception|\GuzzleHttp\Exception\GuzzleException
     */
    protected function handleDocumentJson()
    {
        $handler = new SearchAndDisplaceOriginalDocument();

        if ($this->status !== 'success') {
            $handler->onIngestFail($this->id);

            return;
        }

        if ( ! $this->documentFormat) {
            throw new \Exception('No document format specified.');
        }

        $handler->applySD($this->id, $this->content, $this->documentFormat);
    }
}