<?php

namespace App\Http\Controllers\Frontend;

use App\Exceptions\AssetNotFound;
use App\Models\Aircraft;
use App\Models\Enums\FareType;
use App\Models\Enums\FlightType;
use App\Models\Fare;
use App\Models\Flight;
use App\Models\SimBrief;
use App\Models\User;
use App\Repositories\FlightRepository;
use App\Services\FareService;
use App\Services\SimBriefService;
use App\Services\UserService;
use Exception;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;

class SimBriefController
{
    private $fareSvc;
    private $flightRepo;
    private $simBriefSvc;
    private $userSvc;

    public function __construct(
        FareService $fareSvc,
        FlightRepository $flightRepo,
        SimBriefService $simBriefSvc,
        UserService $userSvc
    ) {
        $this->fareSvc = $fareSvc;
        $this->flightRepo = $flightRepo;
        $this->simBriefSvc = $simBriefSvc;
        $this->userSvc = $userSvc;
    }

    /**
     * Show the main OFP form
     *
     * @param Request $request
     *
     * @throws \Exception
     *
     * @return mixed
     */
    public function generate(Request $request)
    {
        /** @var \App\Models\User $user */
        $user = Auth::user();

        $flight_id = $request->input('flight_id');
        $aircraft_id = $request->input('aircraft_id');

        /** @var Flight $flight */
        $flight = $this->flightRepo->with(['fares', 'subfleets'])->find($flight_id);

        if (!$flight) {
            flash()->error('Unknown flight');
            return redirect(route('frontend.flights.index'));
        }

        $apiKey = setting('simbrief.api_key');
        if (empty($apiKey)) {
            flash()->error('Invalid SimBrief API key!');
            return redirect(route('frontend.flights.index'));
        }

        // No aircraft selected, show selection form
        if (!$aircraft_id) {
            // If no subfleets defined for flight get them from user
            if ($flight->subfleets->count() > 0) {
                $subfleets = $flight->subfleets;
            } else {
                $subfleets = $this->userSvc->getAllowableSubfleets($user);
            }

            // Build an array of subfleet id's from the subfleets collection
            $sf_ids = $subfleets->map(function ($subfleets) {
                return collect($subfleets->toArray())
                  ->only(['id'])
                  ->all();
            });

            // Now we can build a proper aircrafts collection
            // Contents will be either members of flight->subfleets
            // or members of user's allowable subfleets
            $aircrafts = Aircraft::whereIn('subfleet_id', $sf_ids)
                                ->where('state', AircraftState::PARKED)
                                ->where('status', AircraftStatus::ACTIVE)
                                ->orderby('icao')
                                ->orderby('registration')
                                ->get();

            if (setting('pireps.only_aircraft_at_dpt_airport')) {
                $aircrafts = $aircrafts->where('airport_id', $flight->dpt_airport_id);
            }

            return view('flights.simbrief_aircraft', [
                'flight'    => $flight,
                'aircrafts' => $aircrafts,
                'subfleets' => $subfleets,
            ]);
        }

        // Check if a Simbrief profile already exists
        $simbrief = SimBrief::select('id')->where([
            'flight_id' => $flight_id,
            'user_id'   => $user->id,
        ])->first();

        if ($simbrief) {
            return redirect(route('frontend.simbrief.briefing', [$simbrief->id]));
        }

        // SimBrief profile does not exists and everything else is ok
        // Select aircraft which will be used for calculations and details
        /** @var Aircraft $aircraft */
        $aircraft = Aircraft::where('id', $aircraft_id)->first();

        // Figure out the proper fares to use for this flight/aircraft
        $all_fares = $this->fareSvc->getFareWithOverrides($aircraft->subfleet->fares, $flight->fares);

        // TODO: Reconcile the fares for this aircraft w/ proper for the flight/subfleet

        // Get passenger and baggage weights with failsafe defaults
        if ($flight->flight_type === FlightType::CHARTER_PAX_ONLY) {
            $pax_weight = setting('simbrief.charter_pax_weight', 168);
            $bag_weight = setting('simbrief.charter_baggage_weight', 28);
        } else {
            $pax_weight = setting('simbrief.noncharter_pax_weight', 185);
            $bag_weight = setting('simbrief.noncharter_baggage_weight', 35);
        }

        // Get the load factors with failsafe for loadmax if nothing is defined
        $lfactor = $flight->load_factor ?? setting('flights.default_load_factor');
        $lfactorv = $flight->load_factor_variance ?? setting('flights.load_factor_variance');

        $loadmin = $lfactor - $lfactorv;
        $loadmin = $loadmin < 0 ? 0 : $loadmin;

        $loadmax = $lfactor + $lfactorv;
        $loadmax = $loadmax > 100 ? 100 : $loadmax;

        if ($loadmax === 0) {
            $loadmax = 100;
        }

        // Load fares for passengers

        $loaddist = []; // The load distribution string

        $pax_load_sheet = [];
        $tpaxfig = 0;

        /** @var Fare $fare */
        foreach ($all_fares as $fare) {
            if ($fare->type !== FareType::PASSENGER || empty($fare->capacity)) {
                continue;
            }

            $count = floor(($fare->capacity * rand($loadmin, $loadmax)) / 100);
            $tpaxfig += $count;
            $pax_load_sheet[] = [
                'id'       => $fare->id,
                'code'     => $fare->code,
                'name'     => $fare->name,
                'type'     => $fare->type,
                'capacity' => (int) $fare->capacity,
                'count'    => $count,
            ];

            $loaddist[] = $fare->code.' '.$count;
        }

        // Calculate total weights
        if (setting('units.weight') === 'kg') {
            $tpaxload = round(($pax_weight * $tpaxfig) / 2.205);
            $tbagload = round(($bag_weight * $tpaxfig) / 2.205);
        } else {
            $tpaxload = round($pax_weight * $tpaxfig);
            $tbagload = round($bag_weight * $tpaxfig);
        }

        // Load up fares for cargo

        $tcargoload = 0;
        $cargo_load_sheet = [];
        foreach ($all_fares as $fare) {
            if ($fare->type !== FareType::CARGO || empty($fare->capacity)) {
                continue;
            }

            $count = ceil((($fare->capacity - $tbagload) * rand($loadmin, $loadmax)) / 100);
            $tcargoload += $count;
            $cargo_load_sheet[] = [
                'id'       => $fare->id,
                'code'     => $fare->code,
                'name'     => $fare->name,
                'type'     => $fare->type,
                'capacity' => $fare->capacity,
                'count'    => $count,
            ];

            $loaddist[] = $fare->code.' '.$count;
        }

        $tpayload = $tpaxload + $tbagload + $tcargoload;

        $request->session()->put('simbrief_fares', array_merge($pax_load_sheet, $cargo_load_sheet));

        // Show the main simbrief form
        return view('flights.simbrief_form', [
            'user'             => Auth::user(),
            'flight'           => $flight,
            'aircraft'         => $aircraft,
            'pax_weight'       => $pax_weight,
            'bag_weight'       => $bag_weight,
            'loadmin'          => $loadmin,
            'loadmax'          => $loadmax,
            'pax_load_sheet'   => $pax_load_sheet,
            'cargo_load_sheet' => $cargo_load_sheet,
            'tpaxfig'          => $tpaxfig,
            'tpaxload'         => $tpaxload,
            'tbagload'         => $tbagload,
            'tpayload'         => $tpayload,
            'tcargoload'       => $tcargoload,
            'loaddist'         => implode(' ', $loaddist),
        ]);
    }

    /**
     * Show the briefing
     *
     * @param string $id The OFP ID
     *
     * @return \Illuminate\Contracts\View\Factory|\Illuminate\Http\RedirectResponse|\Illuminate\Routing\Redirector|\Illuminate\View\View
     */
    public function briefing($id)
    {
        $simbrief = SimBrief::find($id);
        if (!$simbrief) {
            flash()->error('SimBrief briefing not found');
            return redirect(route('frontend.flights.index'));
        }

        $str = $simbrief->xml->aircraft->equip;
        $wc = stripos($str, '-');
        $tr = stripos($str, '/');
        $wakecat = substr($str, 0, $wc);
        $equipment = substr($str, $wc + 1, $tr - 2);
        $transponder = substr($str, $tr + 1);

        return view('flights.simbrief_briefing', [
            'simbrief'    => $simbrief,
            'wakecat'     => $wakecat,
            'equipment'   => $equipment,
            'transponder' => $transponder,
        ]);
    }

    /**
     * Remove the flight_id from the SimBrief Briefing (to a create a new one)
     * or if no pirep_id is attached to the briefing delete it completely
     *
     * @param \Illuminate\Http\Request $request
     *
     * @throws \Exception
     *
     * @return \Illuminate\Http\RedirectResponse|\Illuminate\Routing\Redirector
     */
    public function generate_new(Request $request)
    {
        $simbrief = SimBrief::find($request->id);

        // Invalid Simbrief ID/profile, go back to the main flight index
        if (!$simbrief) {
            return redirect(route('frontend.flights.index'));
        }

        // Cleanup the current Simbrief entry and redirect to the new generation form
        // If there isn't a PIREP ID, then delete the entry, otherwise, remove the flight
        $flight_id = $simbrief->flight_id;
        if (!$simbrief->pirep_id) {
            $simbrief->delete();
        } else {
            $simbrief->flight_id = null;
            $simbrief->save();
        }

        return redirect(route('frontend.simbrief.generate').'?flight_id='.$flight_id);
    }

    /**
     * Create a prefile of this PIREP with a given OFP. Then redirect the
     * user to the newly prefiled PIREP
     *
     * @param \Illuminate\Http\Request $request
     *
     * @return \Illuminate\Http\RedirectResponse|\Illuminate\Routing\Redirector
     */
    public function prefile(Request $request)
    {
        $sb = SimBrief::find($request->id);
        if (!$sb) {
            return redirect(route('frontend.flights.index'));
        }

        // Redirect to the prefile page, with the flight_id and a simbrief_id
        $rd = route('frontend.pireps.create').'?sb_id='.$sb->id;
        return redirect($rd);
    }

    /**
     * Cancel the SimBrief request
     *
     * @param \Illuminate\Http\Request $request
     *
     * @return \Illuminate\Http\RedirectResponse|\Illuminate\Routing\Redirector
     */
    public function cancel(Request $request)
    {
        $sb = SimBrief::find($request->id);
        if (!$sb) {
            $sb->delete();
        }

        return redirect(route('frontend.simbrief.prefile', ['id' => $request->id]));
    }

    /**
     * Check whether the OFP was generated. Pass in two items, the flight_id and ofp_id
     * This does the actual "attachment" of the Simbrief to the flight
     *
     * @param \Illuminate\Http\Request $request
     *
     * @return \Illuminate\Http\JsonResponse
     */
    public function check_ofp(Request $request)
    {
        /** @var User $user */
        $user = Auth::user();
        $ofp_id = $request->input('ofp_id');
        $flight_id = $request->input('flight_id');
        $aircraft_id = $request->input('aircraft_id');
        $fares = $request->session()->get('simbrief_fares', []);

        $simbrief = $this->simBriefSvc->downloadOfp($user->id, $ofp_id, $flight_id, $aircraft_id, $fares);
        if ($simbrief === null) {
            $error = new AssetNotFound(new Exception('Simbrief OFP not found'));
            return $error->getResponse();
        }

        return response()->json([
            'id' => $simbrief->id,
        ]);
    }

    /**
     * Generate the API code
     *
     * @param \Illuminate\Http\Request $request
     *
     * @throws \Exception
     *
     * @return \Illuminate\Http\JsonResponse|\Illuminate\Http\RedirectResponse|\Illuminate\Routing\Redirector
     */
    public function api_code(Request $request)
    {
        $apiKey = setting('simbrief.api_key', null);
        if (empty($apiKey)) {
            flash()->error('Invalid SimBrief API key!');
            return redirect(route('frontend.flights.index'));
        }

        $api_code = md5($apiKey.$request->input('api_req'));

        return response()->json([
            'api_code' => $api_code,
        ]);
    }
}