<?php
namespace App\Http\Controllers;

use App\Http\Requests\AssetFileRequest;
use Assets;
use Illuminate\Support\Facades\Session;
use Input;
use Lang;
use App\Models\License;
use App\Models\Asset;
use App\Models\User;
use App\Models\Actionlog;
use DB;
use App\Models\LicenseSeat;
use App\Models\Company;
use Validator;
use View;
use Response;
use Slack;
use Config;
use App\Helpers\Helper;
use Auth;
use Gate;
use Illuminate\Http\Request;

/**
 * This controller handles all actions related to Licenses for
 * the Snipe-IT Asset Management application.
 *
 * @version    v1.0
 */
class LicensesController extends Controller
{

    /**
    * Returns a view that invokes the ajax tables which actually contains
    * the content for the licenses listing, which is generated in getDatatable.
    *
    * @author [A. Gianotto] [<snipe@snipe.net>]
    * @see LicensesController::getDatatable() method that generates the JSON response
    * @since [v1.0]
    * @return \Illuminate\Contracts\View\View
     */
    public function index()
    {
        $this->authorize('view', License::class);
        return view('licenses/index');
    }


    /**
    * Returns a form view that allows an admin to create a new licence.
    *
    * @author [A. Gianotto] [<snipe@snipe.net>]
    * @see AccessoriesController::getDatatable() method that generates the JSON response
    * @since [v1.0]
    * @return \Illuminate\Contracts\View\View
     */
    public function create()
    {
        $this->authorize('create', License::class);
        $maintained_list = [
            '' => 'Maintained',
            '1' => 'Yes',
            '0' => 'No'
        ];

        return view('licenses/edit')
            //->with('license_options',$license_options)
            ->with('depreciation_list', Helper::depreciationList())
            ->with('maintained_list', $maintained_list)
            ->with('item', new License);

    }


    /**
     * Validates and stores the license form data submitted from the new
     * license form.
     *
     * @author [A. Gianotto] [<snipe@snipe.net>]
     * @see LicensesController::getCreate() method that provides the form view
     * @since [v1.0]
     * @param Request $request
     * @return \Illuminate\Http\RedirectResponse
     */
    public function store(Request $request)
    {
        $this->authorize('create', License::class);
        // create a new model instance
        $license = new License();
        // Save the license data
        $license->company_id        = Company::getIdForCurrentUser($request->input('company_id'));
        $license->depreciation_id   = $request->input('depreciation_id');
        $license->expiration_date   = $request->input('expiration_date');
        $license->license_email     = $request->input('license_email');
        $license->license_name      = $request->input('license_name');
        $license->maintained        = $request->input('maintained', 0);
        $license->manufacturer_id   = $request->input('manufacturer_id');
        $license->name              = $request->input('name');
        $license->notes             = $request->input('notes');
        $license->order_number      = $request->input('order_number');
        $license->purchase_cost     = $request->input('purchase_cost');
        $license->purchase_date     = $request->input('purchase_date');
        $license->purchase_order    = $request->input('purchase_order');
        $license->purchase_order    = $request->input('purchase_order');
        $license->reassignable      = $request->input('reassignable', 0);
        $license->seats             = $request->input('seats');
        $license->serial            = $request->input('serial');
        $license->supplier_id       = $request->input('supplier_id');
        $license->category_id       = $request->input('category_id');
        $license->termination_date  = $request->input('termination_date');
        $license->user_id           = Auth::id();

        if ($license->save()) {
            return redirect()->route("licenses.index")->with('success', trans('admin/licenses/message.create.success'));
        }
        return redirect()->back()->withInput()->withErrors($license->getErrors());
    }

    /**
    * Returns a form with existing license data to allow an admin to
    * update license information.
    *
    * @author [A. Gianotto] [<snipe@snipe.net>]
    * @since [v1.0]
    * @param int $licenseId
    * @return \Illuminate\Contracts\View\View
     */
    public function edit($licenseId = null)
    {
        if (is_null($item = License::find($licenseId))) {
            return redirect()->route('licenses.index')->with('error', trans('admin/licenses/message.does_not_exist'));
        }

        $this->authorize('update', $item);

        $maintained_list = [
            '' => 'Maintained',
            '1' => 'Yes',
            '0' => 'No'
        ];

        return view('licenses/edit', compact('item'))
            ->with('depreciation_list', Helper::depreciationList())
            ->with('maintained_list', $maintained_list);
    }


    /**
     * Validates and stores the license form data submitted from the edit
     * license form.
     *
     * @author [A. Gianotto] [<snipe@snipe.net>]
     * @see LicensesController::getEdit() method that provides the form view
     * @since [v1.0]
     * @param Request $request
     * @param int $licenseId
     * @return \Illuminate\Http\RedirectResponse
     */
    public function update(Request $request, $licenseId = null)
    {
        if (is_null($license = License::find($licenseId))) {
            return redirect()->route('licenses.index')->with('error', trans('admin/licenses/message.does_not_exist'));
        }

        $this->authorize('update', $license);

        $license->company_id        = Company::getIdForCurrentUser($request->input('company_id'));
        $license->depreciation_id   = $request->input('depreciation_id');
        $license->expiration_date   = $request->input('expiration_date');
        $license->license_email     = $request->input('license_email');
        $license->license_name      = $request->input('license_name');
        $license->maintained        = $request->input('maintained',0);
        $license->name              = $request->input('name');
        $license->notes             = $request->input('notes');
        $license->order_number      = $request->input('order_number');
        $license->purchase_cost     = $request->input('purchase_cost');
        $license->purchase_date     = $request->input('purchase_date');
        $license->purchase_order    = $request->input('purchase_order');
        $license->reassignable      = $request->input('reassignable', 0);
        if (Gate::allows('viewKeys', $license)) {
            $license->serial        = $request->input('serial');
        }
        $license->termination_date  = $request->input('termination_date');
        $license->seats             = e($request->input('seats'));
        $license->manufacturer_id   =  $request->input('manufacturer_id');
        $license->supplier_id       = $request->input('supplier_id');
        $license->category_id       = $request->input('category_id');

        if ($license->save()) {
            return redirect()->route('licenses.show', ['license' => $licenseId])->with('success', trans('admin/licenses/message.update.success'));
        }
        // If we can't adjust the number of seats, the error is flashed to the session by the event handler in License.php
        return redirect()->back()->withInput()->withErrors($license->getErrors());
    }

    /**
    * Checks to see whether the selected license can be deleted, and
    * if it can, marks it as deleted.
    *
    * @author [A. Gianotto] [<snipe@snipe.net>]
    * @since [v1.0]
    * @param int $licenseId
    * @return \Illuminate\Http\RedirectResponse
     */
    public function destroy($licenseId)
    {
        // Check if the license exists
        if (is_null($license = License::find($licenseId))) {
            // Redirect to the license management page
            return redirect()->route('licenses.index')->with('error', trans('admin/licenses/message.not_found'));
        }

        $this->authorize('delete', $license);

        if ($license->assigned_seats_count == 0) {
            // Delete the license and the associated license seats
            DB::table('license_seats')
                ->where('id', $license->id)
                ->update(array('assigned_to' => null,'asset_id' => null));

            $licenseSeats = $license->licenseseats();
            $licenseSeats->delete();
            $license->delete();

            // Redirect to the licenses management page
            return redirect()->route('licenses.index')->with('success', trans('admin/licenses/message.delete.success'));
            // Redirect to the license management page
        }
        // There are still licenses in use.
        return redirect()->route('licenses.index')->with('error', trans('admin/licenses/message.assoc_users'));

    }

    /**
    * Provides the form view for checking out a license to a user.
    * Here we pass the license seat ID instead of the license ID,
    * because licenses themselves are never checked out to anyone,
    * only the seats associated with them.
    *
    * @author [A. Gianotto] [<snipe@snipe.net>]
    * @since [v1.0]
    * @param int $seatId
    * @return \Illuminate\Contracts\View\View
     */
    public function getCheckout($licenceId)
    {
        // Check that the license is valid
        if ($license = License::where('id',$licenceId)->first()) {

            // If the license is valid, check that there is an available seat
            if ($license->getAvailSeatsCountAttribute() < 1) {
                return redirect()->route('licenses.index')->with('error', 'There are no available seats for this license');
            }
        }

        $this->authorize('checkout', $license);
        return view('licenses/checkout', compact('license'));
    }


    /**
     * Validates and stores the license checkout action.
     *
     * @todo Switch to using a FormRequest for validation here.
     * @author [A. Gianotto] [<snipe@snipe.net>]
     * @since [v1.0]
     * @param Request $request
     * @param int $licenseId
     * @param int $seatId
     * @return \Illuminate\Http\RedirectResponse
     */
    public function postCheckout(Request $request, $licenseId, $seatId = null)
    {

        // Check that the license is valid
        if ($license = License::where('id', $licenseId)->first()) {
            
            // If the license is valid, check that there is an available seat
            if ($license->getAvailSeatsCountAttribute() < 1) {
                return redirect()->route('licenses.index')->with('error', 'There are no available seats for this license');
            }
            if (!$seatId) {
                // Get the next available seat for this license
                $next = $license->freeSeat();
                if (!$next) {
                    return redirect()->route('licenses.index')->with('error', 'There are no available seats for this license');
                }
                if (!$licenseSeat = LicenseSeat::where('id', '=', $next->id)->first()) {
                    return redirect()->route('licenses.index')->with('error', 'There are no available seats for this license');
                }
            } else {
                $licenseSeat = LicenseSeat::where('id', '=', $seatId)->first();
                if (!$licenseSeat) {
                    return redirect()->route('licenses.index')->with('error', 'License seat is not available for checkout');
                }
            }
    

            $this->authorize('checkout', $license);

            // Declare the rules for the form validation
            $rules = [
                'note'   => 'string|nullable',
                'asset_id'  => 'required_without:assigned_to',
            ];

            // Create a new validator instance from our validation rules
            $validator = Validator::make(Input::all(), $rules);

            // If validation fails, we'll exit the operation now.
            if ($validator->fails()) {
                // Ooops.. something went wrong
                return redirect()->back()->withInput()->withErrors($validator);
            }
            $target = null;


            // This item is checked out to a an asset
            if (request('checkout_to_type')=='asset') {
                if (is_null($target = Asset::find(request('asset_id')))) {
                    return redirect()->route('licenses.index')->with('error', trans('admin/licenses/message.asset_does_not_exist'));
                }
                $licenseSeat->asset_id = $request->input('asset_id');

                // Override asset's assigned user if available
                if ($target->checkedOutToUser()) {
                    $licenseSeat->assigned_to =  $target->assigned_to;
                }

            } else {

                // Fetch the target and set the license user
                if (is_null($target = User::find(request('assigned_to')))) {
                    return redirect()->route('licenses.index')->with('error', trans('admin/licenses/message.user_does_not_exist'));
                }
                $licenseSeat->assigned_to = request('assigned_to');
            }

            $licenseSeat->user_id = Auth::user()->id;


            if ($licenseSeat->save()) {
                $licenseSeat->logCheckout($request->input('note'), $target);
                return redirect()->route("licenses.index")->with('success', trans('admin/licenses/message.checkout.success'));
            }

        }
        return redirect()->route('licenses.index')->with('error', trans('admin/licenses/message.not_found'));


        return redirect()->route("licenses.index")->with('error', trans('admin/licenses/message.checkout.error'));
    }


    /**
    * Makes the form view to check a license seat back into inventory.
    *
    * @author [A. Gianotto] [<snipe@snipe.net>]
    * @since [v1.0]
    * @param int $seatId
    * @param string $backTo
    * @return \Illuminate\Contracts\View\View
     */
    public function getCheckin($seatId = null, $backTo = null)
    {
        // Check if the asset exists
        if (is_null($licenseSeat = LicenseSeat::find($seatId))) {
            // Redirect to the asset management page with error
            return redirect()->route('licenses.index')->with('error', trans('admin/licenses/message.not_found'));
        }

        if (is_null($license = License::find($licenseSeat->license_id))) {
            // Redirect to the asset management page with error
            return redirect()->route('licenses.index')->with('error', trans('admin/licenses/message.not_found'));
        }


        $this->authorize('checkout', $license);
        return view('licenses/checkin', compact('licenseSeat'))->with('backto', $backTo);
    }


    /**
    * Validates and stores the license checkin action.
    *
    * @author [A. Gianotto] [<snipe@snipe.net>]
    * @see LicensesController::getCheckin() method that provides the form view
    * @since [v1.0]
    * @param int $seatId
    * @param string $backTo
    * @return \Illuminate\Http\RedirectResponse
     */
    public function postCheckin($seatId = null, $backTo = null)
    {
        // Check if the asset exists
        if (is_null($licenseSeat = LicenseSeat::find($seatId))) {
            // Redirect to the asset management page with error
            return redirect()->route('licenses.index')->with('error', trans('admin/licenses/message.not_found'));
        }

        $license = License::find($licenseSeat->license_id);
        $this->authorize('checkout', $license);

        if (!$license->reassignable) {
            // Not allowed to checkin
            Session::flash('error', 'License not reassignable.');
            return redirect()->back()->withInput();
        }


        $return_to = User::find($licenseSeat->assigned_to);
        if (!$return_to) {
            $return_to = Asset::find($licenseSeat->asset_id);
        }

        // Update the asset data
        $licenseSeat->assigned_to                   = null;
        $licenseSeat->asset_id                      = null;

        // Was the asset updated?
        if ($licenseSeat->save()) {
            $licenseSeat->logCheckin($license, e(request('note')));
            if ($backTo=='user') {
                return redirect()->route("users.show", $return_to->id)->with('success', trans('admin/licenses/message.checkin.success'));
            }
            return redirect()->route("licenses.show", $licenseSeat->license_id)->with('success', trans('admin/licenses/message.checkin.success'));
        }

        // Redirect to the license page with error
        return redirect()->route("licenses.index")->with('error', trans('admin/licenses/message.checkin.error'));
    }

    /**
    * Makes the license detail page.
    *
    * @author [A. Gianotto] [<snipe@snipe.net>]
    * @since [v1.0]
    * @param int $licenseId
    * @return \Illuminate\Contracts\View\View
     */
    public function show($licenseId = null)
    {

        $license = License::with('assignedusers', 'licenseSeats.user', 'licenseSeats.asset')->find($licenseId);

        if ($license) {
            $this->authorize('view', $license);
            return view('licenses/view', compact('license'));
        }
        return redirect()->route('licenses.index')->with('error', trans('admin/licenses/message.does_not_exist', compact('id')));
    }
    

    public function getClone($licenseId = null)
    {
        if (is_null($license_to_clone = License::find($licenseId))) {
            return redirect()->route('licenses.index')->with('error', trans('admin/licenses/message.does_not_exist'));
        }

        $this->authorize('create', License::class);

        $maintained_list = [
            '' => 'Maintained',
            '1' => 'Yes',
            '0' => 'No'
        ];
        //clone the orig
        $license = clone $license_to_clone;
        $license->id = null;
        $license->serial = null;

        // Show the page
        return view('licenses/edit')
        ->with('depreciation_list', Helper::depreciationList())
        ->with('item', $license)
        ->with('maintained_list', $maintained_list);
    }


    /**
    * Validates and stores files associated with a license.
    *
    * @todo Switch to using the AssetFileRequest form request validator.
    * @author [A. Gianotto] [<snipe@snipe.net>]
    * @since [v1.0]
    * @param int $licenseId
    * @return \Illuminate\Http\RedirectResponse
     */
    public function postUpload(AssetFileRequest $request, $licenseId = null)
    {
        $license = License::find($licenseId);
        // the license is valid
        $destinationPath = config('app.private_uploads').'/licenses';

        if (isset($license->id)) {
            $this->authorize('update', $license);

            if (Input::hasFile('file')) {

                foreach (Input::file('file') as $file) {
                    $extension = $file->getClientOriginalExtension();
                    $filename = 'license-'.$license->id.'-'.str_random(8).'-'.str_slug(basename($file->getClientOriginalName(), '.'.$extension)).'.'.$extension;
                    $upload_success = $file->move($destinationPath, $filename);

                    //Log the upload to the log
                    $license->logUpload($filename, e($request->input('notes')));
                }
                // This being called from a modal seems to confuse redirect()->back()
                // It thinks we should go to the dashboard.  As this is only used
                // from the modal at present, hardcode the redirect.  Longterm
                // maybe we evaluate something else.
                if ($upload_success) {
                    return redirect()->route('licenses.show', $license->id)->with('success', trans('admin/licenses/message.upload.success'));
                }
                return redirect()->route('licenses.show', $license->id)->with('error', trans('admin/licenses/message.upload.error'));
            }
            return redirect()->route('licenses.show', $license->id)->with('error', trans('admin/licenses/message.upload.nofiles'));
        }
        // Prepare the error message
        $error = trans('admin/licenses/message.does_not_exist', compact('id'));
        return redirect()->route('licenses.index')->with('error', $error);
    }


    /**
    * Deletes the selected license file.
    *
    * @author [A. Gianotto] [<snipe@snipe.net>]
    * @since [v1.0]
    * @param int $licenseId
    * @param int $fileId
    * @return \Illuminate\Http\RedirectResponse
     */
    public function getDeleteFile($licenseId = null, $fileId = null)
    {
        $license = License::find($licenseId);
        $destinationPath = config('app.private_uploads').'/licenses';

        // the license is valid
        if ($license) {
            $this->authorize('edit', $license);
            $log = Actionlog::find($fileId);
            $full_filename = $destinationPath.'/'.$log->filename;
            if (file_exists($full_filename)) {
                unlink($destinationPath.'/'.$log->filename);
            }
            $log->delete();
            return redirect()->back()->with('success', trans('admin/licenses/message.deletefile.success'));
        }
        // Prepare the error message
        $error = trans('admin/licenses/message.does_not_exist', compact('id'));

        // Redirect to the licence management page
        return redirect()->route('licenses.index')->with('error', $error);
    }


    /**
    * Allows the selected file to be viewed.
    *
    * @author [A. Gianotto] [<snipe@snipe.net>]
    * @since [v1.4]
    * @param int $licenseId
    * @param int $fileId
    * @return \Symfony\Component\HttpFoundation\BinaryFileResponse
     */
    public function displayFile($licenseId = null, $fileId = null, $download = true)
    {

        $license = License::find($licenseId);

        // the license is valid
        if (isset($license->id)) {
            $this->authorize('view', $license);
            $log = Actionlog::find($fileId);
            $file = $log->get_src('licenses');


            if ($file =='') {
                return response('File not found on server', 404)
                    ->header('Content-Type', 'text/plain');
            }

            $mimetype = \File::mimeType($file);


            if (!file_exists($file)) {
                return response('File '.$file.' not found on server', 404)
                    ->header('Content-Type', 'text/plain');
            }

            if ($download != 'true') {
                if ($contents = file_get_contents($file)) {
                    return Response::make($contents)->header('Content-Type', $mimetype);
                }
                return JsonResponse::create(["error" => "Failed validation: "], 500);
            }
            return Response::download($file);
        }


        return redirect()->route('licenses.index')->with('error', trans('admin/licenses/message.does_not_exist', compact('id')));
    }


    /**
    * Generates the next free seat ID for checkout.
    *
    * @todo This is a dumb way to solve this problem.
    * Author should refactor. And go hide in a hole and
    * think about what she's done. And perhaps find a new
    * line of work. And get in the sea.
    *
    * @author [A. Gianotto] [<snipe@snipe.net>]
    * @since [v1.0]
    * @param int $licenseId
    * @return \Illuminate\Http\RedirectResponse
     */
    public function getFreeLicense($licenseId)
    {
        $this->authorize('checkout', License::class);
        if (is_null($license = License::find($licenseId))) {
            return redirect()->route('licenses.index')->with('error', trans('admin/licenses/message.not_found'));
        }
        $seatId = $license->freeSeat($licenseId);
        return redirect()->route('licenses.checkout', $seatId);
    }
}