<?php
/**
 * Invoice Ninja (https://invoiceninja.com).
 *
 * @link https://github.com/invoiceninja/invoiceninja source repository
 *
 * @copyright Copyright (c) 2020. Invoice Ninja LLC (https://invoiceninja.com)
 *
 * @license https://opensource.org/licenses/AAL
 */

namespace App\Http\Controllers;

use App\Http\Requests\Import\ImportRequest;
use App\Http\Requests\Import\PreImportRequest;
use App\Jobs\Import\CSVImport;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Str;
use League\Csv\Reader;
use League\Csv\Statement;

class ImportController extends Controller
{

    /**
     * Store a newly created resource in storage.
     *
     * @param StoreImportRequest $request
     * @return Response
     *
     * @OA\Post(
     *      path="/api/v1/preimport",
     *      operationId="preimport",
     *      tags={"imports"},
     *      summary="Pre Import checks - returns a reference to the job and the headers of the CSV",
     *      description="Pre Import checks - returns a reference to the job and the headers of the CSV",
     *      @OA\Parameter(ref="#/components/parameters/X-Api-Secret"),
     *      @OA\Parameter(ref="#/components/parameters/X-Api-Token"),
     *      @OA\Parameter(ref="#/components/parameters/X-Requested-With"),
     *      @OA\Parameter(ref="#/components/parameters/include"),
     *      @OA\RequestBody(
     *         description="The CSV file",
     *         required=true,
     *         @OA\MediaType(
     *             mediaType="multipart/form-data",
     *             @OA\Schema(
     *                 type="string",
     *                 format="binary"
     *             )
     *         )
     *      ),
     *      @OA\Response(
     *          response=200,
     *          description="Returns a reference to the file",
     *          @OA\Header(header="X-MINIMUM-CLIENT-VERSION", ref="#/components/headers/X-MINIMUM-CLIENT-VERSION"),
     *          @OA\Header(header="X-RateLimit-Remaining", ref="#/components/headers/X-RateLimit-Remaining"),
     *          @OA\Header(header="X-RateLimit-Limit", ref="#/components/headers/X-RateLimit-Limit"),
     *       ),
     *       @OA\Response(
     *          response=422,
     *          description="Validation error",
     *          @OA\JsonContent(ref="#/components/schemas/ValidationError"),
     *
     *       ),
     *       @OA\Response(
     *           response="default",
     *           description="Unexpected Error",
     *           @OA\JsonContent(ref="#/components/schemas/Error"),
     *       ),
     *     )
     */
    public function preimport(PreImportRequest $request)
    {
        //create a reference
        $hash = Str::random(32);

        //store the csv in cache with an expiry of 10 minutes
        Cache::put($hash, base64_encode(file_get_contents($request->file('file')->getPathname())), 3600);

        //parse CSV
        $csv_array = $this->getCsvData(file_get_contents($request->file('file')->getPathname()));

        $class_map = $this->getEntityMap($request->input('entity_type'));

        $data = [
            'hash' => $hash,
            'available' => $class_map::importable(),
            'headers' => array_slice($csv_array, 0, 2)
        ];

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

    public function import(ImportRequest $request)
    {
        CSVImport::dispatch($request->all(), auth()->user()->company());
        
        return response()->json(['message' => 'Importing data, email will be sent on completion'], 200);
    }

    private function getEntityMap($entity_type)
    {
        return sprintf('App\\Import\\Definitions\%sMap', ucfirst($entity_type));
    }

    private function getCsvData($csvfile)
    {
        if (! ini_get('auto_detect_line_endings')) {
            ini_set('auto_detect_line_endings', '1');
        }

        $csv = Reader::createFromString($csvfile);
        $stmt = new Statement();
        $data = iterator_to_array($stmt->process($csv));

        if (count($data) > 0) {
            $headers = $data[0];

            // Remove Invoice Ninja headers
            if (count($headers) && count($data) > 4) {
                $firstCell = $headers[0];
                if (strstr($firstCell, config('ninja.app_name'))) {
                    array_shift($data); // Invoice Ninja...
                    array_shift($data); // <blank line>
                    array_shift($data); // Enitty Type Header
                }
            }
        }

        return $data;
    }
}