<?php

namespace App\Http\Controllers;

use Carbon\Carbon;
use Illuminate\Database\QueryException;
use Illuminate\Http\Request;
use Illuminate\Support\Arr;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Notification;
use Illuminate\Support\ViewErrorBag;

use App\Classes\FTN\Message;
use App\Http\Requests\{AddressMerge,AreafixRequest,SystemRegister};
use App\Jobs\AddressPoll;
use App\Models\{Address,Echoarea,Filearea,Netmail,Setup,System,SystemZone,Zone};
use App\Notifications\Netmails\AddressLink;
use App\Rules\{FidoInteger,TwoByteInteger};

class SystemController extends Controller
{
	private const LOGKEY = 'CSC';

	/**
	 * Add or edit a node
	 */
	public function add_edit(SystemRegister $request,System $o)
	{
		$this->authorize('update',$o);

		if ($request->post()) {
			foreach (['name','location','sysop','hold','phone','address','port','active','method','notes','zt_id','pkt_type','heartbeat'] as $key)
				$o->{$key} = $request->post($key);

			switch ($request->post('pollmode')) {
				case 1: $o->pollmode = FALSE; break;
				case 2: $o->pollmode = TRUE; break;
				default: $o->pollmode = NULL;
			}

			$o->autohold = FALSE;
			$o->save();

			$mailers = collect($request->post('mailer_details'))
				->filter(function($item) { return $item['port']; })
				->transform(function($item) { $item['active'] = Arr::get($item,'active',FALSE); return $item; });

			$o->mailers()->sync($mailers);

			return redirect()->to('system');
		}

		$o->load(['addresses.zone.domain','addresses.system','sessions.domain','sessions.systems']);

		return view('system.addedit')
				->with('action',$o->exists ? 'update' : 'create')
				->with('o',$o);
	}

	/**
	 * Add an address to a system
	 *
	 * @param Request $request
	 * @param System $o
	 * @return \Illuminate\Http\RedirectResponse
	 * @throws \Illuminate\Auth\Access\AuthorizationException
	 */
	public function address_add(Request $request,System $o)
	{
		// @todo a point address is failing validation
		// @todo This should be admin of the zone
		$this->authorize('admin',$o);
		session()->flash('accordion','address');

		$request->validate([
			'action' => 'required|in:region,host,node,update',
			'zone_id' => 'required|exists:zones,id',
		]);

		switch ($request->post('action')) {
			case 'region':
				$request->validate([
					'region_id_new' => [
						'required',
						new TwoByteInteger,
						function ($attribute,$value,$fail) {
							// Check that the region doesnt already exist
							$o = Address::where(function($query) use ($value) {
								return $query->where('region_id',$value)
									->where('host_id',0)
									->where('node_id',0)
									->where('point_id',0)
									->where('role',Address::NODE_RC);
							})
								// Check that a host doesnt already exist
								->orWhere(function($query) use ($value) {
									return $query->where('host_id',$value)
										->where('point_id',0)
										->where('role',Address::NODE_NC);
								});

							if ($o->count()) {
								$fail('Region or host already exists');
							}
						},
					],
				]);

				$oo = new Address;
				$oo->zone_id = $request->post('zone_id');
				$oo->region_id = $request->post('region_id_new');
				$oo->host_id = 0;
				$oo->node_id = 0;
				$oo->point_id = 0;
				$oo->role = Address::NODE_RC;
				$oo->active = TRUE;

				$o->addresses()->save($oo);
				break;

			case 'host':
				$request->validate([
					'region_id' => ['required',new FidoInteger],
					'host_id_new' => [
						'required',
						new TwoByteInteger,
						function ($attribute,$value,$fail) use ($request) {
							// Check that the region doesnt already exist
							$o = Address::where(function($query) use ($value) {
								return $query->where(function($query) use ($value) {
									return $query->where('region_id',$value)
										->where('role',Address::NODE_RC);
								})
									// Check that a host doesnt already exist
									->orWhere(function($query) use ($value) {
										return $query->where('host_id',$value)
											->where('role',Address::NODE_NC);
									});
							})
								->where('zone_id',$request->post('zone_id'))
								->where('point_id',0)
								->where('active',TRUE);

							if ($o->count()) {
								$fail('Region or host already exists');
							}
						},
					],
					'node_id_new' => [
						'required',
						new TwoByteInteger,
						function ($attribute,$value,$fail) use ($request) {
							// Check that the region doesnt already exist
							$o = Address::where(function($query) use ($request,$value) {
								return $query
									->where('host_id',$request->post('host_id_new'))
									->where('node_id',$value)
									->where('point_id',0)
									->where('role',Address::NODE_RC);
							});

							if ($o->count()) {
								$fail('Host already exists');
							}
						},
					]
				]);

				// Find the Hub address
				// Find the zones <HOST>/0 address, and assign it to this host.
				$oo = Address::where('zone_id',$request->zone_id)
					->where('region_id',$request->region_id)
					->where('host_id',$request->host_id_new)
					->where('node_id',0)
					->where('point_id',0)
					->single();

				// Its not defined, so we'll create it.
				if (! $oo) {
					$oo = new Address;
					$oo->forceFill([
						'zone_id'=>$request->zone_id,
						'region_id'=>$request->region_id,
						'host_id'=>$request->host_id_new,
						'node_id'=>0,
						'point_id'=>0,
						'role'=>Address::NODE_NC,
					]);
				}

				$oo->system_id = $request->system_id;
				$oo->active = TRUE;
				$o->addresses()->save($oo);

				$oo = new Address;
				$oo->zone_id = $request->post('zone_id');
				$oo->region_id = $request->post('region_id');
				$oo->host_id = $request->post('host_id_new');
				$oo->node_id = $request->post('node_id_new');
				$oo->point_id = 0;
				$oo->role = Address::NODE_ACTIVE;
				$oo->active = TRUE;

				$o->addresses()->save($oo);
				break;

			case 'update':
			case 'node':
				$request->validate([
					'region_id' => ['required',new FidoInteger],
					'host_id' => ['required',new FidoInteger],
					'node_id' => [
						'required',
						new TwoByteInteger,
						function ($attribute,$value,$fail) use ($request) {
							if ($request->point_id === 0) {
								// Check that the host doesnt already exist
								$o = Address::where(function($query) use ($request,$value) {
									return $query
										->where('zone_id',$request->post('zone_id'))
										->where('host_id',$request->post('host_id'))
										->where('node_id',$value)
										->where('point_id',0)
										->where('id','<>',$request->post('submit'));
								});

								if ($o->count()) {
									$fail(sprintf('Host already exists: %s',$o->get()->pluck('ftn')->join(',')));
								}
							}
						},
					],
					'point_id' => [
						'required',
						function($attribute,$value,$fail) use ($request) {
							if (! is_numeric($value) || $value > DomainController::NUMBER_MAX)
								$fail(sprintf('Point numbers must be between 0 and %d',DomainController::NUMBER_MAX));

							// Check that the host doesnt already exist
							$o = Address::where(function($query) use ($request,$value) {
								return $query
									->where('zone_id',$request->post('zone_id'))
									->where('host_id',$request->post('host_id'))
									->where('node_id',$request->post('node_id'))
									->where('point_id',$value)
									->where('id','<>',$request->post('submit'));
							});

							if ($o->count()) {
								$fail(sprintf('Point already exists: %s',$o->get()->pluck('ftn')->join(',')));
							}
						}
					],
					'hub' => 'required|boolean',
					'hub_id' => 'nullable|exists:addresses,id',
					'security' => 'required|integer|min:0|max:7',
				]);

				$oo = Address::findOrNew($request->post('submit'));
				$oo->zone_id = $request->post('zone_id');
				$oo->region_id = $request->post('region_id');
				$oo->host_id = $request->post('host_id');
				$oo->node_id = $request->post('node_id');
				$oo->point_id = $request->post('point_id');
				$oo->hub_id = $request->post('hub_id') > 0 ? $request->post('hub_id') : NULL;
				if (is_null($oo->role))
					$oo->role = ((! $oo->point_id) && $request->post('hub')) ? Address::NODE_HC : ($request->post('point_id') ? Address::NODE_POINT : Address::NODE_ACTIVE);
				$oo->security = $request->post('security');
				$oo->active = TRUE;

				$o->addresses()->save($oo);
				break;

			default:
				return redirect()->back()->withErrors(['action'=>'Unknown action: '.$request->post('action')]);
		}

		return redirect()->to(sprintf('system/addedit/%d',$o->id));
	}

	/**
	 * Delete address assigned to a host
	 *
	 * @param Address $o
	 * @return \Illuminate\Http\RedirectResponse
	 * @throws \Illuminate\Auth\Access\AuthorizationException
	 */
	public function address_del(Address $o)
	{
		// @todo This should be admin of the zone
		$this->authorize('admin',$o);
		session()->flash('accordion','address');

		$sid = $o->system_id;
		$o->active = FALSE;
		$o->save();
		$o->delete();

		return redirect()->to(sprintf('system/addedit/%d',$sid));
	}

	/**
	 * Demote an address NC -> node
	 *
	 * @param Address $o
	 * @return \Illuminate\Http\RedirectResponse
	 * @throws \Illuminate\Auth\Access\AuthorizationException
	 */
	public function address_dem(Address $o)
	{
		// @todo This should be admin of the zone
		$this->authorize('admin',$o);
		session()->flash('accordion','address');

		// Make sure that no other system has this address active.
		if ($o->role === Address::NODE_ACTIVE)
			return redirect()->back()->withErrors(['demaddress'=>sprintf('%s cannot be demoted any more',$o->ftn3D)]);

		$o->role = ($o->role << 1);
		$o->save();

		return redirect()->to(sprintf('system/addedit/%d',$o->system_id));
	}

	public function address_merge(AddressMerge $request,int $id)
	{
		if ($request->validated()) {
			DB::beginTransaction();

			// Find all echomail seenbys
			$x = DB::update('update echomail_seenby set address_id=? where address_id=?',[$request->dst,$request->src]);

			// Find all echomail paths
			$x = DB::update('update echomail_path set address_id=? where address_id=?',[$request->dst,$request->src]);

			// Find all echomails
			$x = DB::update('update echomails set fftn_id=? where fftn_id=?',[$request->dst,$request->src]);

			// Find all netmails
			$x = DB::update('update netmails set fftn_id=? where fftn_id=?',[$request->dst,$request->src]);

			// Find all netmails
			$x = DB::update('update netmails set tftn_id=? where tftn_id=?',[$request->dst,$request->src]);

			// Find all nodelist
			$x = DB::update('update address_nodelist set address_id=? where address_id=?',[$request->dst,$request->src]);

			// Find all file seenbys
			$x = DB::update('update file_seenby set address_id=? where address_id=?',[$request->dst,$request->src]);

			// Find all files
			$x = DB::update('update files set fftn_id=? where fftn_id=?',[$request->dst,$request->src]);

			$src = Address::withTrashed()->findOrFail($request->src);

			// Resubscribe echoareas
			try {
				$x = DB::update('update address_echoarea set address_id=? where address_id=?',[$request->dst,$request->src]);

			} catch (QueryException $e) {
				DB::rollback();

				return back()->withInput()->withErrors('error',sprintf('You may need to remove %s:%s (%d) from echoareas',$src->ftn,$src->system->name,$src->id));
			}

			// Resubscribe fileareas
			try {
				$x = DB::update('update address_filearea set address_id=? where address_id=?',[$request->dst,$request->src]);

			} catch (QueryException $e) {
				DB::rollback();

				return back()->withInput()->withErrors('error',sprintf('You may need to remove %s:%s (%d) from fileareas',$src->ftn,$src->system->name,$src->id));
			}

			if ($src->forceDelete()) {
				DB::commit();
				return redirect()->to('address/merge/'.$request->dst);

			} else {
				return back()->withInput()->withErrors('error',sprintf('Address [%s] didnt delete?',$src->ftn));
				DB::rollBack();
			}
		}
		$o = Address::withTrashed()
			->findOrFail($id);

		$oo = Address::withTrashed()
			->where('zone_id',$o->zone_id)
			->where('host_id',$o->host_id)
			->where('node_id',$o->node_id)
			->where('point_id',$o->point_id)
			->get();

		if ($o->zone->domain->flatten)
			$oo = $oo->merge(Address::withTrashed()
				->whereIn('zone_id',$o->zone->domain->zones->pluck('id'))
				->where('host_id',$o->host_id)
				->where('node_id',$o->node_id)
				->where('point_id',$o->point_id)
				->get()
			);

		return view('system/address-merge')
			->with('o',$o)
			->with('oo',$oo);
	}

	/**
	 * Move address to another system
	 *
	 * @param Request $request
	 * @param System $so
	 * @param Address $o
	 * @return \Illuminate\Contracts\Foundation\Application|\Illuminate\Contracts\View\Factory|\Illuminate\Contracts\View\View|\Illuminate\Http\RedirectResponse
	 * @throws \Illuminate\Auth\Access\AuthorizationException
	 */
	public function address_mov(Request $request,System $so,Address $o)
	{
		session()->flash('accordion','address');

		// Quick check that this address belongs to this system
		if ($so->addresses->search(function($item) use ($o) { return $item->id === $o->id; }) === FALSE)
			abort(404);

		if ($request->post()) {
			$this->authorize('admin',$o);

			$validated = $request->validate([
				'system_id' => 'required|exists:systems,id',
				'remove' => 'nullable|boolean',
				'remsess' => 'nullable|boolean|exclude_if:remove,1',
			]);

			$o->system_id = $validated['system_id'];
			$o->save();

			if (Arr::get($validated,'remove')) {
				$so->sessions()->detach($o->zone);
				$so->mailers()->detach();
				$so->users()->detach();
				$so->delete();

			} elseif (Arr::get($validated,'remsess')) {
				$so->sessions()->detach($o->zone);
			}

			return redirect()->to('system/addedit/'.$validated['system_id']);
		}

		return view('system.moveaddr')
			->with('o',$o);
	}

	/**
	 * Promote an address node -> NC
	 *
	 * @param Address $o
	 * @return \Illuminate\Http\RedirectResponse
	 * @throws \Illuminate\Auth\Access\AuthorizationException
	 */
	public function address_pro(Address $o)
	{
		// @todo This should be admin of the zone
		$this->authorize('admin',$o);
		session()->flash('accordion','address');

		// Make sure that no other system has this address active.
		if ($o->role === Address::NODE_NC)
			return redirect()->back()->withErrors(['proaddress'=>sprintf('%s cannot be promoted any more',$o->ftn3D)]);

		$o->role = ($o->role >> 1);
		$o->save();

		return redirect()->to(sprintf('system/addedit/%d',$o->system_id));
	}

	/**
	 * Recover a deleted address
	 *
	 * @param int $id
	 * @return \Illuminate\Http\RedirectResponse
	 * @throws \Illuminate\Auth\Access\AuthorizationException
	 */
	public function address_pur(int $id)
	{
		$o = Address::onlyTrashed()->findOrFail($id);

		// @todo This should be admin of the zone
		$this->authorize('admin',$o);
		session()->flash('accordion','address');

		$o->forceDelete();

		return redirect()->to(sprintf('system/addedit/%d',$o->system_id));
	}

	/**
	 * Recover a deleted address
	 *
	 * @param int $id
	 * @return \Illuminate\Http\RedirectResponse
	 * @throws \Illuminate\Auth\Access\AuthorizationException
	 */
	public function address_rec(int $id)
	{
		$o = Address::onlyTrashed()->findOrFail($id);

		// @todo This should be admin of the zone
		$this->authorize('admin',$o);
		session()->flash('accordion','address');

		$o->restore();

		return redirect()->to(sprintf('system/addedit/%d',$o->system_id));
	}

	/**
	 * Suspend address assigned to a host
	 *
	 * @param Address $o
	 * @return \Illuminate\Http\RedirectResponse
	 * @throws \Illuminate\Auth\Access\AuthorizationException
	 */
	public function address_sus(Address $o)
	{
		// @todo This should be admin of the zone
		$this->authorize('admin',$o);
		session()->flash('accordion','address');

		// Make sure that no other system has this address active.
		if (! $o->active && ($x=Address::where([
				'zone_id'=>$o->zone_id,
				'host_id'=>$o->host_id,
				'node_id'=>$o->node_id,
				'point_id'=>$o->point_id,
				'active'=>TRUE,
			])->single())) {

			return redirect()->back()->withErrors(['susaddress'=>sprintf('%s is already active on system [<a href="%s">%s</a>]',$o->ftn,url('system/addedit',$x->system_id),$x->system->name)]);
		}

		$o->active = (! $o->active);
		$o->save();

		return redirect()->to(sprintf('system/addedit/%d',$o->system_id));
	}

	public function api_address(Request $request,System $o): Collection
	{
		return Address::select(['addresses.id','addresses.zone_id','region_id','host_id','node_id','point_id'])
			->leftjoin('zones',['zones.id'=>'addresses.zone_id'])
			->where('addresses.system_id',$o->id)
			->where('zones.domain_id',$request->domain_id)
			->withTrashed()
			->FTNorder()
			->get()
			->map(function($item) { return ['id'=>(string)$item->id,'value'=>$item->ftn4d]; });
	}

	public function api_address_get(Address $o)
	{
		return $o;
	}

	/**
	 * Identify all the addresses from systems that are not owned by a user
	 *
	 * @param Request $request
	 * @return Collection
	 */
	public function api_address_orphan(Request $request): Collection
	{
		$result = collect();

		list($zone_id,$host_id,$node_id,$point_id,$domain) = sscanf($request->query('term'),'%d:%d/%d.%d@%s');

		# Look for Systems
		foreach (Address::select(['addresses.id','systems.name',DB::raw('systems.id AS system_id'),'zones.zone_id','region_id','host_id','node_id','point_id','addresses.zone_id'])
			 ->join('zones',['zones.id'=>'addresses.zone_id'])
			 ->rightjoin('systems',['systems.id'=>'addresses.system_id'])
			 ->when($zone_id || $host_id || $node_id,function($query) use ($zone_id,$host_id,$node_id) {
				 return $query
					 ->when($zone_id,function($q,$zone_id) { return $q->where('zones.zone_id',$zone_id); })
					 ->where(function($q) use ($host_id) {
						 return $q
							 ->when($host_id,function($q,$host_id) { return $q->where('region_id',$host_id); })
							 ->when($host_id,function($q,$host_id) { return $q->orWhere('host_id',$host_id); });
					 })
					 ->when($node_id,function($q,$node_id) { return $q->where('node_id',$node_id); });
			 })
			 ->orWhere('systems.name','ilike','%'.$request->query('term').'%')
			 ->orderBy('systems.name')
			 ->get() as $o)
		{
			$result->push(['id'=>$o->id,'name'=>sprintf('%s (%s)',$o->ftn3d,$o->name),'category'=>'Systems']);
		}

		return $result;
	}

	public function areafix(AreafixRequest $request,System $o,Zone $zo)
	{
		if ($request->post()) {
			$no = new Netmail;
			foreach ($request->safe() as $item => $value)
				$no->{$item} = $value;

			$no->from = auth::user()->name;
			$no->msg .= "\r";

			$no->datetime = Carbon::now();
			$no->tzoffset = $no->datetime->utcOffset();
			$no->flags = (Message::FLAG_LOCAL|Message::FLAG_PRIVATE|Message::FLAG_CRASH);
			$no->cost = 0;

			$no->tearline = sprintf('%s (%04X)',Setup::PRODUCT_NAME,Setup::PRODUCT_ID);
			$no->save();

			Log::info(sprintf('%s:= Areafix to [%s], scheduling a poll',self::LOGKEY,$no->tftn->ftn));
			AddressPoll::dispatch($no->tftn);

			return redirect()->back()->with('success','Areafix/Filefix sent');
		}

		return view('system.areafix')
			->with('zo',$zo)
			->with('ao',$o->match($zo)->first())
			->with('o',$o)
			->with('setup',Setup::findOrFail(config('app.id')));
	}

	/**
	 * Update the systems echoareas
	 *
	 * @param Request $request
	 * @param System $o
	 * @return \Illuminate\Contracts\Foundation\Application|\Illuminate\Contracts\View\Factory|\Illuminate\Contracts\View\View|\Illuminate\Http\RedirectResponse
	 */
	public function echoareas(Request $request,System $o)
	{
		$ao = $o->addresses->firstWhere('id',$request->address_id);

		if (($request->method() === 'POST') && $request->post()) {
			session()->flash('accordion','echoarea');

			if ($ao->trashed() && collect($request->get('id'))->diff($ao->echoareas->pluck('id'))->count())
				return redirect()->back()->withErrors(sprintf('Address [%s] has been deleted, cannot add additional echos',$ao->ftn3d));

			// Ensure we have session details for this address.
			if (! $ao->session('sespass'))
				return redirect()->back()->withErrors('System doesnt belong to this network');

			$ao->echoareas()->syncWithPivotValues($request->get('id',[]),['subscribed'=>Carbon::now()]);

			return redirect()->back()->with('success','Echoareas updated');
		}

		// @todo Allow a NC/RC/ZC to override
		$eo = Echoarea::active()
			->where('domain_id',$ao->zone->domain_id)
			->where(function($query) use ($ao) {
				return $query
					->whereRaw(sprintf('(security&7) <= %d',$ao->security))			// write
					->orWhereRaw(sprintf('((security>>3)&7) <= %d',$ao->security));	// read
			})
			->orderBy('name')
			->get();

		return view('system.widget.echoarea')
			->with('o',$o)
			->with('ao',$ao)
			->with('echoareas',$eo);
	}

	/**
	 * Update the systems fileareas
	 *
	 * @param Request $request
	 * @param System $o
	 * @return \Illuminate\Contracts\Foundation\Application|\Illuminate\Contracts\View\Factory|\Illuminate\Contracts\View\View|\Illuminate\Http\RedirectResponse
	 */
	public function fileareas(Request $request,System $o)
	{
		$ao = $o->addresses->firstWhere('id',$request->address_id);

		if (($request->method() === 'POST') && $request->post()) {
			session()->flash('accordion','filearea');

			// Ensure we have session details for this address.
			if (! $ao->session('sespass'))
				return redirect()->back()->withErrors('System doesnt belong to this network');

			$ao->fileareas()->syncWithPivotValues($request->get('id',[]),['subscribed'=>Carbon::now()]);

			return redirect()->back()->with('success','Fileareas updated');
		}

		// @todo Allow a NC/RC/ZC to override
		$fo = Filearea::active()
			->where('domain_id',$ao->zone->domain_id)
			->where(function($query) use ($ao) {
				return $query
					->whereRaw(sprintf('(security&7) <= %d',$ao->security))			// write
					->orWhereRaw(sprintf('((security>>3)&7) <= %d',$ao->security));	// read
			})
			->orderBy('name')
			->get();

		return view('system.widget.filearea')
			->with('o',$o)
			->with('ao',$ao)
			->with('fileareas',$fo);
	}

	/**
	 * Register a system, or link to an existing system
	 */
	public function register(SystemRegister $request)
	{
		// Step 1, show the user a form to select an existing defined system
		if ($request->isMethod('GET'))
			return view('user.system.register');

		if ($request->action === 'register' && $request->name && is_numeric($request->name))
			return view('user.system.widget.register_confirm')
				->with('o',System::findOrFail($request->name));

		$o = System::findOrNew(is_numeric($request->system_id) ? $request->system_id : NULL);

		// If the system exists, and we are 'register', we'll start the address claim process
		if ($o->exists && $request->action === 'Link') {
			$validate = Setup::findOrFail(config('app.id'))->system->inMyZones($o->addresses);

			// If we have addresses, we'll trigger the routed netmail
			if ($validate->count()) {
				Notification::route('netmail',$x=$validate->first())->notify(new AddressLink(Auth::user()));
				AddressPoll::dispatch($x)->delay(15);
			}

			return view('user.system.widget.register_send')
				->with('validate',$validate)
				->with('o',$o);
		}

		// If the system doesnt exist, we'll create it
		if (! $o->exist) {
			$o->sysop = Auth::user()->name;

			foreach (['name','zt_id','location','phone','method','address','port'] as $item)
				if ($request->{$item})
					$o->{$item} = $request->{$item};

			$o->active = TRUE;
		}

		if ($request->post('submit')) {
			Auth::user()->systems()->save($o);

			// @todo if the system already exists and part of one of our networks, we'll need to send the registration email to confirm the address.
			// @todo mark the system (or addresses) as "pending" at this stage until it is confirmed
			return redirect()->to(url('system/addedit',$o->id));
		}

		// Re-flash our previously input data
		if ($request->old)
			session()->flashInput($request->old);

		return view('system.widget.form-system')
			->with('action',$request->action)
			->with('o',$o)
			->with('errors',new ViewErrorBag);
	}

	/**
	 * Add Session details
	 *
	 * @param Request $request
	 * @param System $o
	 * @return \Illuminate\Http\RedirectResponse
	 * @throws \Illuminate\Auth\Access\AuthorizationException
	 */
	public function session_add(Request $request,System $o)
	{
		// @todo This should be admin of the zone
		$this->authorize('update',$o);
		session()->flash('accordion','session');

		$validate = $request->validate([
			'zone_id' => 'required|exists:zones,id',
			'sespass' => 'required|string|min:4',
			'pktpass' => 'required|string|min:4|max:8',
			'ticpass' => 'required|string|min:4',
			'fixpass' => 'required|string|min:4',
		]);

		$zo = Zone::findOrFail($validate['zone_id']);

		// If this session is for the ZC, it now becomes the default.
		if ($o->match($zo,Address::NODE_ZC)->count()) {
			SystemZone::where('default',TRUE)->update(['default'=>FALSE]);
			$validate['default'] = TRUE;
		}

		$o->sessions()->attach($zo,$validate);

		return redirect()->to(sprintf('system/addedit/%d',$o->id));
	}

	/**
	 * Delete address assigned to a host
	 *
	 * @param Address $o
	 * @return \Illuminate\Http\RedirectResponse
	 * @throws \Illuminate\Auth\Access\AuthorizationException
	 */
	public function session_del(System $o,Zone $zo)
	{
		$this->authorize('admin',$zo);
		session()->flash('accordion','session');

		$o->sessions()->detach($zo);

		return redirect()->to(sprintf('system/addedit/%d',$o->id));
	}
	// @todo Can this be consolidated with system_register()

	public function system_link(Request $request)
	{
		if (! $request->system_id)
			return redirect('user/system/register');

		$so = System::findOrFail($request->system_id);

		$ca = NULL;
		$la = NULL;
		foreach (our_address() as $ao) {
			if (($ca=$so->match($ao->zone))->count())
				break;
		}

		if ($ca->count() && $la=$ca->pop()) {
			Notification::route('netmail',$la)->notify(new AddressLink(Auth::user()));
			AddressPoll::dispatch($la)->delay(15);
		}

		return view('user.system.register_send')
			->with('la',$la)
			->with('o',$so);
	}

	public function view(System $o)
	{
		$o->load(['addresses']);

		return view('system.view')
			->with('o',$o);
	}
}