<?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\Events\Invoice\InvoiceWasCreated;
use App\Events\Invoice\InvoiceWasUpdated;
use App\Factory\CloneInvoiceFactory;
use App\Factory\CloneInvoiceToQuoteFactory;
use App\Factory\InvoiceFactory;
use App\Filters\InvoiceFilters;
use App\Helpers\Email\InvoiceEmail;
use App\Http\Requests\Invoice\ActionInvoiceRequest;
use App\Http\Requests\Invoice\CreateInvoiceRequest;
use App\Http\Requests\Invoice\DestroyInvoiceRequest;
use App\Http\Requests\Invoice\EditInvoiceRequest;
use App\Http\Requests\Invoice\ShowInvoiceRequest;
use App\Http\Requests\Invoice\StoreInvoiceRequest;
use App\Http\Requests\Invoice\UpdateInvoiceRequest;
use App\Jobs\Invoice\CreateInvoicePdf;
use App\Jobs\Invoice\EmailInvoice;
use App\Jobs\Invoice\StoreInvoice;
use App\Jobs\Invoice\ZipInvoices;
use App\Models\Invoice;
use App\Models\InvoiceInvitation;
use App\Repositories\InvoiceRepository;
use App\Transformers\InvoiceTransformer;
use App\Utils\Traits\MakesHash;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\File;
use Illuminate\Support\Facades\Storage;

/**
 * Class InvoiceController
 * @package App\Http\Controllers\InvoiceController
 */

class InvoiceController extends BaseController {

	use MakesHash;

	protected $entity_type = Invoice::class ;

	protected $entity_transformer = InvoiceTransformer::class ;

	/**
	 * @var InvoiceRepository
	 */
	protected $invoice_repo;

	/**
	 * InvoiceController constructor.
	 *
	 * @param      \App\Repositories\InvoiceRepository  $invoice_repo  The invoice repo
	 */
	public function __construct(InvoiceRepository $invoice_repo) {

		parent::__construct();

		$this->invoice_repo = $invoice_repo;

	}

	/**
	 * Show the list of Invoices
	 *
	 * @param      \App\Filters\InvoiceFilters  $filters  The filters
	 *
	 * @return \Illuminate\Http\Response
	 *
	 * @OA\Get(
	 *      path="/api/v1/invoices",
	 *      operationId="getInvoices",
	 *      tags={"invoices"},
	 *      summary="Gets a list of invoices",
	 *      description="Lists invoices, search and filters allow fine grained lists to be generated.
	 *
	 *		Query parameters can be added to performed more fine grained filtering of the invoices, these are handled by the InvoiceFilters class which defines the methods available",
	 *      @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\Response(
	 *          response=200,
	 *          description="A list of invoices",
	 *          @OA\Header(header="X-API-Version", ref="#/components/headers/X-API-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\JsonContent(ref="#/components/schemas/Invoice"),
	 *       ),
	 *       @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 index(InvoiceFilters $filters) {
		$invoices = Invoice::filter($filters);

		return $this->listResponse($invoices);
	}

	/**
	 * Show the form for creating a new resource.
	 *
	 * @param      \App\Http\Requests\Invoice\CreateInvoiceRequest  $request  The request
	 *
	 * @return \Illuminate\Http\Response
	 *
	 *
	 * @OA\Get(
	 *      path="/api/v1/invoices/create",
	 *      operationId="getInvoicesCreate",
	 *      tags={"invoices"},
	 *      summary="Gets a new blank invoice object",
	 *      description="Returns a blank object with default values",
	 *      @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\Response(
	 *          response=200,
	 *          description="A blank invoice object",
	 *          @OA\Header(header="X-API-Version", ref="#/components/headers/X-API-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\JsonContent(ref="#/components/schemas/Invoice"),
	 *       ),
	 *       @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 create(CreateInvoiceRequest $request) {
		$invoice = InvoiceFactory::create(auth()->user()->company()->id, auth()->user()->id);

		return $this->itemResponse($invoice);
	}

	/**
	 * Store a newly created resource in storage.
	 *
	 * @param      \App\Http\Requests\Invoice\StoreInvoiceRequest  $request  The request
	 *
	 * @return \Illuminate\Http\Response
	 *
	 *
	 * @OA\Post(
	 *      path="/api/v1/invoices",
	 *      operationId="storeInvoice",
	 *      tags={"invoices"},
	 *      summary="Adds a invoice",
	 *      description="Adds an invoice to the system",
	 *      @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\Response(
	 *          response=200,
	 *          description="Returns the saved invoice object",
	 *          @OA\Header(header="X-API-Version", ref="#/components/headers/X-API-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\JsonContent(ref="#/components/schemas/Invoice"),
	 *       ),
	 *       @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 store(StoreInvoiceRequest $request) {
		$invoice = $this->invoice_repo->save($request->all(), InvoiceFactory::create(auth()->user()->company()->id, auth()->user()->id));

		$invoice = StoreInvoice::dispatchNow($invoice, $request->all(), $invoice->company);//todo potentially this may return mixed ie PDF/$invoice... need to revisit when we implement UI

		event(new InvoiceWasCreated($invoice, $invoice->company));

		return $this->itemResponse($invoice);
	}

	/**
	 * Display the specified resource.
	 *
	 * @param      \App\Http\Requests\Invoice\ShowInvoiceRequest  $request  The request
	 * @param      \App\Models\Invoice                            $invoice  The invoice
	 *
	 * @return \Illuminate\Http\Response
	 *
	 *
	 * @OA\Get(
	 *      path="/api/v1/invoices/{id}",
	 *      operationId="showInvoice",
	 *      tags={"invoices"},
	 *      summary="Shows an invoice",
	 *      description="Displays an invoice by id",
	 *      @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\Parameter(
	 *          name="id",
	 *          in="path",
	 *          description="The Invoice Hashed ID",
	 *          example="D2J234DFA",
	 *          required=true,
	 *          @OA\Schema(
	 *              type="string",
	 *              format="string",
	 *          ),
	 *      ),
	 *      @OA\Response(
	 *          response=200,
	 *          description="Returns the invoice object",
	 *          @OA\Header(header="X-API-Version", ref="#/components/headers/X-API-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\JsonContent(ref="#/components/schemas/Invoice"),
	 *       ),
	 *       @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 show(ShowInvoiceRequest $request, Invoice $invoice) {
		return $this->itemResponse($invoice);
	}

	/**
	 * Show the form for editing the specified resource.
	 *
	 * @param      \App\Http\Requests\Invoice\EditInvoiceRequest  $request  The request
	 * @param      \App\Models\Invoice                            $invoice  The invoice
	 *
	 * @return \Illuminate\Http\Response
	 *
	 * @OA\Get(
	 *      path="/api/v1/invoices/{id}/edit",
	 *      operationId="editInvoice",
	 *      tags={"invoices"},
	 *      summary="Shows an invoice for editting",
	 *      description="Displays an invoice by id",
	 *      @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\Parameter(
	 *          name="id",
	 *          in="path",
	 *          description="The Invoice Hashed ID",
	 *          example="D2J234DFA",
	 *          required=true,
	 *          @OA\Schema(
	 *              type="string",
	 *              format="string",
	 *          ),
	 *      ),
	 *      @OA\Response(
	 *          response=200,
	 *          description="Returns the invoice object",
	 *          @OA\Header(header="X-API-Version", ref="#/components/headers/X-API-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\JsonContent(ref="#/components/schemas/Invoice"),
	 *       ),
	 *       @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 edit(EditInvoiceRequest $request, Invoice $invoice) {
		return $this->itemResponse($invoice);
	}

	/**
	 * Update the specified resource in storage.
	 *
	 * @param      \App\Http\Requests\Invoice\UpdateInvoiceRequest  $request  The request
	 * @param      \App\Models\Invoice                              $invoice  The invoice
	 *
	 * @return \Illuminate\Http\Response
	 *
	 *
	 * @OA\Put(
	 *      path="/api/v1/invoices/{id}",
	 *      operationId="updateInvoice",
	 *      tags={"invoices"},
	 *      summary="Updates an invoice",
	 *      description="Handles the updating of an invoice by id",
	 *      @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\Parameter(
	 *          name="id",
	 *          in="path",
	 *          description="The Invoice Hashed ID",
	 *          example="D2J234DFA",
	 *          required=true,
	 *          @OA\Schema(
	 *              type="string",
	 *              format="string",
	 *          ),
	 *      ),
	 *      @OA\Response(
	 *          response=200,
	 *          description="Returns the invoice object",
	 *          @OA\Header(header="X-API-Version", ref="#/components/headers/X-API-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\JsonContent(ref="#/components/schemas/Invoice"),
	 *       ),
	 *       @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 update(UpdateInvoiceRequest $request, Invoice $invoice) {
		if ($request->entityIsDeleted($invoice)) {
			return $request->disallowUpdate();
		}

		$invoice = $this->invoice_repo->save($request->all(), $invoice);

		event(new InvoiceWasUpdated($invoice, $invoice->company));

		return $this->itemResponse($invoice);
	}

	/**
	 * Remove the specified resource from storage.
	 *
	 * @param      \App\Http\Requests\Invoice\DestroyInvoiceRequest  $request
	 * @param      \App\Models\Invoice                               $invoice
	 *
	 * @return     \Illuminate\Http\Response
	 *
	 * @OA\Delete(
	 *      path="/api/v1/invoices/{id}",
	 *      operationId="deleteInvoice",
	 *      tags={"invoices"},
	 *      summary="Deletes a invoice",
	 *      description="Handles the deletion of an invoice by id",
	 *      @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\Parameter(
	 *          name="id",
	 *          in="path",
	 *          description="The Invoice Hashed ID",
	 *          example="D2J234DFA",
	 *          required=true,
	 *          @OA\Schema(
	 *              type="string",
	 *              format="string",
	 *          ),
	 *      ),
	 *      @OA\Response(
	 *          response=200,
	 *          description="Returns a HTTP status",
	 *          @OA\Header(header="X-API-Version", ref="#/components/headers/X-API-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 destroy(DestroyInvoiceRequest $request, Invoice $invoice) {
		$invoice->delete();

		return response()->json([], 200);
	}

	/**
	 * Perform bulk actions on the list view
	 *
	 * @return Collection
	 *
	 * @OA\Post(
	 *      path="/api/v1/invoices/bulk",
	 *      operationId="bulkInvoices",
	 *      tags={"invoices"},
	 *      summary="Performs bulk actions on an array of invoices",
	 *      description="",
	 *      @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/index"),
	 *      @OA\RequestBody(
	 *         description="User credentials",
	 *         required=true,
	 *         @OA\MediaType(
	 *             mediaType="application/json",
	 *             @OA\Schema(
	 *                 type="array",
	 *                 @OA\Items(
	 *                     type="integer",
	 *                     description="Array of hashed IDs to be bulk 'actioned",
	 *                     example="[0,1,2,3]",
	 *                 ),
	 *             )
	 *         )
	 *     ),
	 *      @OA\Response(
	 *          response=200,
	 *          description="The Bulk Action response",
	 *          @OA\Header(header="X-API-Version", ref="#/components/headers/X-API-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 bulk() {

		/*
		 * WIP!
		 */
		$action = request()->input('action');

		$ids = request()->input('ids');

		$invoices = Invoice::withTrashed()->whereIn('id', $this->transformKeys($ids))->company()->get();

		if (!$invoices) {
			return response()->json(['message' => 'No Invoices Found']);
		}

		if($action == 'download' && $invoices->count() > 1)
		{
			
			$invoices->each(function ($invoice) {

				if(auth()->user()->cannot('view', $invoice)){
					return response()->json(['message'=>'Insufficient privileges to access invoice '. $invoice->number]);
				}

			});

			ZipInvoices::dispatch($invoices, $invoices->first()->company, auth()->user()->email);

			return response()->json(['message' => 'Email Sent!'],200);
		}


		$invoices->each(function ($invoice, $key) use ($action) {

			if (auth()->user()->can('edit', $invoice)) {
				$this->performAction($invoice, $action, true);
			}

		});

		/* Need to understand which permission are required for the given bulk action ie. view / edit */

		return $this->listResponse(Invoice::withTrashed()->whereIn('id', $this->transformKeys($ids))->company());
	}


	/**
	 *
	 * @OA\Get(
	 *      path="/api/v1/invoices/{id}/{action}",
	 *      operationId="actionInvoice",
	 *      tags={"invoices"},
	 *      summary="Performs a custom action on an invoice",
	 *      description="Performs a custom action on an invoice.
     *
	 *		The current range of actions are as follows
	 *		- clone_to_invoice
	 *		- clone_to_quote
	 *		- history
	 *		- delivery_note
	 *		- mark_paid
	 *		- download
	 *		- archive
	 *		- delete
	 *		- email",
	 *      @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\Parameter(
	 *          name="id",
	 *          in="path",
	 *          description="The Invoice Hashed ID",
	 *          example="D2J234DFA",
	 *          required=true,
	 *          @OA\Schema(
	 *              type="string",
	 *              format="string",
	 *          ),
	 *      ),
	 *      @OA\Parameter(
	 *          name="action",
	 *          in="path",
	 *          description="The action string to be performed",
	 *          example="clone_to_quote",
	 *          required=true,
	 *          @OA\Schema(
	 *              type="string",
	 *              format="string",
	 *          ),
	 *      ),
	 *      @OA\Response(
	 *          response=200,
	 *          description="Returns the invoice object",
	 *          @OA\Header(header="X-API-Version", ref="#/components/headers/X-API-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\JsonContent(ref="#/components/schemas/Invoice"),
	 *       ),
	 *       @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 action(ActionInvoiceRequest $request, Invoice $invoice, $action) {
		return $this->performAction($invoice, $action);
	}

	private function performAction(Invoice $invoice, $action, $bulk = false) {
		/*If we are using bulk actions, we don't want to return anything */
		switch ($action) {
			case 'clone_to_invoice':
				$invoice = CloneInvoiceFactory::create($invoice, auth()->user()->id);
				return $this->itemResponse($invoice);
				break;
			case 'clone_to_quote':
				$quote = CloneInvoiceToQuoteFactory::create($invoice, auth()->user()->id);
				// todo build the quote transformer and return response here
				break;
			case 'history':
				# code...
				break;
			case 'delivery_note':
				# code...
				break;
			case 'mark_paid':
				if ($invoice->balance < 0 || $invoice->status_id == Invoice::STATUS_PAID || $invoice->is_deleted === true) {
					return $this->errorResponse(['message' => 'Invoice cannot be marked as paid'], 400);
				}

				$invoice = $invoice->service()->markPaid();

				if (!$bulk) {
					return $this->itemResponse($invoice);
				}
				break;
			case 'mark_sent':
				$invoice->service()->markSent()->save();

				if (!$bulk) {
					return $this->itemResponse($invoice);
				}
				break;
			case 'download':
				return response()->download(public_path($invoice->pdf_file_path()));
				break;
			case 'archive':
				$this->invoice_repo->archive($invoice);

				if (!$bulk) {
					return $this->listResponse($invoice);
				}
				break;
			case 'delete':
				$this->invoice_repo->delete($invoice);

				if (!$bulk) {
					return $this->listResponse($invoice);
				}
				break;
			case 'email':
				$invoice->invitations->each(function ($invitation) use($invoice){

            		$email_builder = (new InvoiceEmail())->build($invitation, $this->reminder_template);

					EmailInvoice::dispatch($email_builder, $invitation, $invoice->company);

				});

				if (!$bulk) {
					return response()->json(['message' => 'email sent'], 200);
				}
				break;

			default:
				return response()->json(['message' => "The requested action `{$action}` is not available."], 400);
			break;
		}
	}

	/**
	 *
	 * @OA\Get(
	 *      path="/api/v1/invoice/{invitation_key}/download",
	 *      operationId="downloadInvoice",
	 *      tags={"invoices"},
	 *      summary="Download a specific invoice by invitation key",
	 *      description="Downloads a specific invoice",
	 *      @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\Parameter(
	 *          name="invitation_key",
	 *          in="path",
	 *          description="The Invoice Invitation Key",
	 *          example="D2J234DFA",
	 *          required=true,
	 *          @OA\Schema(
	 *              type="string",
	 *              format="string",
	 *          ),
	 *      ),
	 *      @OA\Response(
	 *          response=200,
	 *          description="Returns the invoice pdf",
	 *          @OA\Header(header="X-API-Version", ref="#/components/headers/X-API-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 downloadPdf($invitation_key) {

		$invitation = $this->invoice_repo->getInvitationByKey($invitation_key);
		$contact    = $invitation->contact;
		$invoice    = $invitation->invoice;

		$file_path = $invoice->service()->getInvoicePdf($contact); 

		return response()->download($file_path);

	}
}