<?php

namespace App\Jobs;

use Carbon\Carbon;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;
use Illuminate\Support\Arr;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Notification;
use Illuminate\Support\Facades\Storage;
use League\Flysystem\UnableToMoveFile;

use App\Classes\File;
use App\Classes\File\Item;
use App\Classes\FTN\{InvalidPacketException,Packet};
use App\Models\Address;
use App\Notifications\Netmails\PacketPasswordInvalid;

class PacketProcess implements ShouldQueue
{
	private const LOGKEY = 'JPP';

	use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

	private Item $file;
	private Address $ao;
	private Carbon $rcvd_time;

	public function __construct(Item $file,Address $ao,Carbon $rcvd_time)
	{
		$this->file = $file;
		$this->ao = $ao;
		$this->rcvd_time = $rcvd_time;
	}

	public function __get($key): mixed
	{
		switch ($key) {
			case 'subject':
				return $this->file->name;

			default:
				return NULL;
		}
	}

	/**
	 * When calling MessageProcess - we assume that the packet is from a valid source, and
	 * the destination (netmail/echomail) is also valid
	 */
	public function handle()
	{
		Log::info(sprintf('%s:- Processing mail %s [%s]',self::LOGKEY,$this->file->whatType() === Item::IS_PKT ? 'PACKET' : 'ARCHIVE',$this->file->nameas));

		$fs = Storage::disk(config('fido.local_disk'));

		// @todo Catch files that we cannot process, eg: ARJ bundles.
		try {
			$f = new File($this->file->full_name);
			$processed = FALSE;

			foreach ($f as $packet) {
				$pkt = Packet::process($packet,Arr::get(stream_get_meta_data($packet),'uri'),$f->itemSize(),$this->ao->zone->domain);

				// Check the messages are from the uplink
				if ($this->ao->system->addresses->search(function($item) use ($pkt) { return $item->id === $pkt->fftn_o->id; }) === FALSE) {
					Log::error(sprintf('%s:! Packet [%s] is not from this link? [%d]',self::LOGKEY,$pkt->fftn_o->ftn,$this->ao->system_id));

					break;
				}

				// Check the packet password
				if (strtoupper($this->ao->session('pktpass')) !== strtoupper($pkt->password)) {
					Log::error(sprintf('%s:! Packet from [%s] with password [%s] is invalid.',self::LOGKEY,$this->ao->ftn,$pkt->password));

					Notification::route('netmail',$this->ao)->notify(new PacketPasswordInvalid($pkt->password,$this->file->nameas));
					break;
				}

				Log::info(sprintf('%s:- Packet has [%d] messages',self::LOGKEY,$pkt->count()));

				// Queue messages if there are too many in the packet.
				if ($queue = ($pkt->count() > config('fido.queue_msgs')))
					Log::info(sprintf('%s:- Messages will be sent to the queue for processing',self::LOGKEY));

				$count = 0;
				foreach ($pkt as $msg) {
					Log::info(sprintf('%s:- Mail from [%s] to [%s]',self::LOGKEY,$msg->fftn,$msg->tftn));

					// @todo Quick check that the packet should be processed by us.
					// @todo validate that the packet's zone is in the domain.

					/*
					* // @todo generate exception when echomail for an area that doesnt exist
					* // @todo generate exception when echomail for an area sender cannot post to
					* // @todo generate exception when echomail for an area sender not subscribed to
					* // @todo generate exception when echomail comes from a system not defined here
					* // @todo generate exception when echomail comes from a system doesnt exist
					*
					* // @todo generate exception when netmail to system that doesnt exist (node/point)
					* // @todo generate exception when netmail from system that doesnt exist (node/point)
					* // @todo generate warning when netmail comes from a system not defined here
					*
					* // @todo generate exception when packet has wrong password
					*/

					try {
						// Dispatch job.
						if ($queue)
							MessageProcess::dispatch($msg,$f->pktName(),$this->ao->withoutRelations(),$pkt->fftn_o->withoutRelations(),$this->rcvd_time);
						else
							MessageProcess::dispatchSync($msg,$f->pktName(),$this->ao->withoutRelations(),$pkt->fftn_o->withoutRelations(),$this->rcvd_time);

					} catch (\Exception $e) {
						Log::error(sprintf('%s:! Got error dispatching message [%s] (%d:%s-%s).',self::LOGKEY,$msg->msgid,$e->getLine(),$e->getFile(),$e->getMessage()));
					}

					$count++;
				}

				if ($count === $pkt->count())
					$processed = TRUE;
			}

			if (! $processed) {
				Log::alert(sprintf('%s:- Not deleting packet [%s], it doesnt seem to be processed?',self::LOGKEY,$this->file->nameas));

			} else {
				// If we want to keep the packet, we could do that logic here
				if (config('fido.packet_keep')) {
					$dir = sprintf('%s/%s',config('fido.dir'),Carbon::now()->format('Ymd'));
					Log::debug(sprintf('%s:- Moving processed packet [%s] to [%s]',self::LOGKEY,$this->file->rel_name,$dir));

					try {
						if ($fs->makeDirectory($dir)) {
							$fs->move($this->file->rel_name,$x=sprintf('%s/%s',$dir,$this->file->pref_name));
							Log::info(sprintf('%s:- Moved processed packet [%s] to [%s]',self::LOGKEY,$this->file->rel_name,$x));

						} else
							Log::error(sprintf('%s:! Unable to create dir [%s]',self::LOGKEY,$dir));

					} catch (UnableToMoveFile $e) {
						Log::error(sprintf('%s:! Unable to move packet [%s] to [%s] (%s)',self::LOGKEY,$this->file->full_name,$dir,$e->getMessage()));

					} catch (\Exception $e) {
						Log::error(sprintf('%s:! Failed moving packet [%s] to [%s] (%s)',self::LOGKEY,$this->file->full_name,$dir,$e->getMessage()));
					}

				} else {
					Log::debug(sprintf('%s:- Deleting processed packet [%s]',self::LOGKEY,$this->file->full_name));

					// @todo Change this to use Storage::disk()
					unlink($this->file->full_name);
				}
			}

		} catch (InvalidPacketException $e) {
			Log::error(sprintf('%s:- Not deleting packet [%s], as it generated an InvalidPacketException',self::LOGKEY,$this->file->nameas),['e'=>$e->getMessage()]);

		} catch (\Exception $e) {
			Log::error(sprintf('%s:- Not deleting packet [%s], as it generated an uncaught exception',self::LOGKEY,$this->file->nameas),['e'=>$e->getMessage()]);
		}
	}
}