<?php

namespace App\Http\Controllers\Admin;

use App\ExternalService;
use App\Facade\Theme;
use App\Facade\UserConfig;
use App\Http\Controllers\Controller;
use App\Http\Requests\StoreServiceRequest;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\App;
use Illuminate\Support\Facades\View;

class ServiceController extends Controller
{
    /**
     * List of fields that must be encrypted before being saved.
     *
     * @var string[]
     */
    private $fieldsToEncrypt;

    /**
     * List of fields that depend on the service_type being configured.
     *
     * @var string[]
     */
    private $serviceTypeDependentFields;

    public function __construct()
    {
        $this->middleware('auth');
        View::share('is_admin', true);

        $this->serviceTypeDependentFields = ['app_id', 'app_secret'];
        $this->fieldsToEncrypt = ['app_id', 'app_secret'];
    }

    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function create()
    {
        $this->authorizeAccessToAdminPanel('admin:manage-services');

        return Theme::render('admin.create_service', [
            'service' => new ExternalService(),
            'serviceTypes' => $this->serviceTypeList()
        ]);
    }

    public function delete(Request $request, $id)
    {
        $this->authorizeAccessToAdminPanel('admin:manage-users');

        $service = ExternalService::where('id', intval($id))->first();
        if (is_null($service))
        {
            App::abort(404);
        }

        if ($this->isServiceInUse($service))
        {
            $request->session()->flash('warning', trans('admin.cannot_delete_service_in_use'));
            return redirect(route('services.index'));
        }

        return Theme::render('admin.delete_service', ['service' => $service]);
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function destroy(Request $request, $id)
    {
        $this->authorizeAccessToAdminPanel('admin:manage-services');

        $service = ExternalService::where('id', intval($id))->first();
        if (is_null($service))
        {
            App::abort(404);
        }

        if ($this->isServiceInUse($service))
        {
            $request->session()->flash('warning', trans('admin.cannot_delete_service_in_use'));
            return redirect(route('services.index'));
        }

        try
        {
            $service->delete();
            $request->session()->flash('success', trans('admin.service_deletion_successful', [
                'name' => $service->name
            ]));
        }
        catch (\Exception $ex)
        {
            $request->session()->flash('error', trans('admin.service_deletion_failed', [
                'error_message' => $ex->getMessage(),
                'name' => $service->name
            ]));
        }

        return redirect(route('services.index'));
    }

    /**
     * Show the form for editing the specified resource.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function edit(Request $request, $id)
    {
        $this->authorizeAccessToAdminPanel('admin:manage-services');

        $service = ExternalService::where('id', intval($id))->first();
        if (is_null($service))
        {
            App::abort(404);
        }

        // Decrypt the fields that are stored as encrypted in the DB
        foreach ($this->fieldsToEncrypt as $field)
        {
            if (!empty($service->$field))
            {
                $service->$field = decrypt($service->$field);
            }
        }

        return Theme::render('admin.edit_service', [
            'service' => $service,
            'serviceTypes' => $this->serviceTypeList()
        ]);
    }

    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index(Request $request)
    {
        $this->authorizeAccessToAdminPanel('admin:manage-services');

        $services = ExternalService::orderBy('name')
            ->paginate(UserConfig::get('items_per_page'));

        return Theme::render('admin.list_services', [
            'error' => $request->session()->get('error'),
            'services' => $services,
            'success' => $request->session()->get('success'),
            'warning' => $request->session()->get('warning')
        ]);
    }

    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(StoreServiceRequest $request)
    {
        $this->authorizeAccessToAdminPanel('admin:manage-services');

        $service = new ExternalService($request->only(['name', 'service_type']));

        foreach ($this->serviceTypeDependentFields as $field)
        {
            if ($request->has($field))
            {
                $service->$field = in_array($field, $this->fieldsToEncrypt)
                    ? encrypt($request->get($field))
                    : $request->get($field);
            }
        }

        $service->save();

        return redirect(route('services.index'));
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function update(StoreServiceRequest $request, $id)
    {
        $this->authorizeAccessToAdminPanel('admin:manage-services');

        $service = ExternalService::where('id', intval($id))->first();
        if (is_null($service))
        {
            App::abort(404);
        }

        $service->fill($request->only(['name', 'service_type']));

        foreach ($this->serviceTypeDependentFields as $field)
        {
            if ($request->has($field))
            {
                $service->$field = in_array($field, $this->fieldsToEncrypt)
                    ? encrypt($request->get($field))
                    : $request->get($field);
            }
        }

        $service->save();

        return redirect(route('services.index'));
    }

    private function isServiceInUse(ExternalService $service)
    {
        // TODO check if the service is in use anywhere else and prevent it being deleted if so
        return false;
    }

    private function serviceTypeList()
    {
        return [
            ExternalService::DROPBOX => trans(sprintf('services.%s', ExternalService::DROPBOX)),
            ExternalService::FACEBOOK => trans(sprintf('services.%s', ExternalService::FACEBOOK)),
            ExternalService::GOOGLE => trans(sprintf('services.%s', ExternalService::GOOGLE)),
            ExternalService::TWITTER => trans(sprintf('services.%s', ExternalService::TWITTER))
        ];
    }
}