<?php
/**
 * Invoice Ninja (https://invoiceninja.com).
 *
 * @link https://github.com/invoiceninja/invoiceninja source repository
 *
 * @copyright Copyright (c) 2021. Invoice Ninja LLC (https://invoiceninja.com)
 *
 * @license https://www.elastic.co/licensing/elastic-license
 */

namespace App\Http\Controllers;

use App\Http\Requests\Import\ImportRequest;
use App\Http\Requests\Import\PreImportRequest;
use App\Jobs\Import\CSVImport;
use Illuminate\Http\UploadedFile;
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 PreImportRequest $request
	 *
	 * @return \Illuminate\Http\JsonResponse
	 *
	 * @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 );

		$data = [
			'hash'     => $hash,
			'mappings' => [],
		];
		/** @var UploadedFile $file */
		foreach ( $request->files->get( 'files' ) as $entityType => $file ) {
			$contents = file_get_contents( $file->getPathname() );
			// $contents = mb_convert_encoding($contents, 'UTF-16LE', 'UTF-8');

			// Store the csv in cache with an expiry of 10 minutes
			Cache::put( $hash . '-' . $entityType, base64_encode( $contents ), 600 );

			// Parse CSV
			$csv_array = $this->getCsvData( $contents );

			$class_map = $this->getEntityMap( $entityType );

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

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

	public function import( ImportRequest $request ) {
		$data = $request->all();

		if ( empty( $data['hash'] ) ) {
			// Create a reference
			$data['hash'] = $hash = Str::random( 32 );

			/** @var UploadedFile $file */
			foreach ( $request->files->get( 'files' ) as $entityType => $file ) {
				$contents = file_get_contents( $file->getPathname() );

				// Store the csv in cache with an expiry of 10 minutes
				Cache::put( $hash . '-' . $entityType, base64_encode( $contents ), 600 );
			}
		}

		CSVImport::dispatch( $data, auth()->user()->company() );

		return response()->json( [ 'message' => ctrans( 'texts.import_started' ) ], 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, (string)config('ninja.app_name'))) {
					array_shift( $data ); // Invoice Ninja...
					array_shift( $data ); // <blank line>
					array_shift( $data ); // Entity Type Header
				}
            }
        }

        return $data;
    }
}