<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Casts\Attribute;
use Carbon\Carbon;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class UserFlight extends Model
{
    protected $table = 'user_flights';

    protected $fillable = [
        'user_id',
        'departure_date',
        'arrival_date',
        'flight_number',
        'departure_airport_id',
        'arrival_airport_id',
        'airline_id',
        'aircraft_id',
        'aircraft_registration',
        'seat_number',
        'seat_type_id',
        'flight_class_id',
        'flight_reason_id',
        'crew_type_id',
        'note',
        'auto_update',
    ];

    protected $casts = [
        'departure_date' => 'immutable_datetime',
        'arrival_date'   => 'immutable_datetime',
        'auto_update' => 'boolean',
    ];

    protected $appends = [
        'departure_date_display',
        'departure_time_display',
        'arrival_date_display',
        'arrival_time_display',
        'arrival_day_difference',
        'duration',
        'duration_display',
        'distance',
    ];

    public function calculateGreatCircleDistance(): float{
        $earthRadiusKm = 6371;
        [$depLat, $depLong] = [$this->departureAirport->latitude_deg, $this->departureAirport->longitude_deg];
        [$arrLat, $arrLong] = [$this->arrivalAirport->latitude_deg, $this->arrivalAirport->longitude_deg];


        $latDelta  = deg2rad($arrLat - $depLat);
        $longDelta = deg2rad($arrLong - $depLong);

        $a = sin($latDelta / 2) * sin($latDelta / 2)
            + cos(deg2rad($depLat)) * cos(deg2rad($arrLat))
            * sin($longDelta / 2) * sin($longDelta / 2);

        $c = 2 * atan2(sqrt($a), sqrt(1 - $a));

        return $earthRadiusKm * $c;
    }

    protected function departureDateDisplay(): Attribute
    {
        return Attribute::make(
            get: fn() => $this->departure_date
                ->toMutable()
                ->setTimezone($this->departureAirport->timezone)
                ->format('j M Y')
        );
    }

    protected function departureTimeDisplay(): Attribute
    {
        return Attribute::make(
            get: fn() => $this->departure_date
                ->toMutable()
                ->setTimezone($this->departureAirport->timezone)
                ->format('g:iA')
        );
    }

    protected function arrivalDateDisplay(): Attribute
    {
        return Attribute::make(
            get: fn() => $this->arrival_date
                ?->copy()
                ->setTimezone($this->arrivalAirport->timezone)
                ->format('j M Y')
        );
    }

    protected function arrivalTimeDisplay(): Attribute
    {
        return Attribute::make(
            get: fn() => $this->arrival_date
                ?->copy()
                ->setTimezone($this->arrivalAirport->timezone)
                ->format('g:iA')
        );
    }

    protected function arrivalDayDifference(): Attribute
    {
        return Attribute::make(
            get: function () {
                if (!$this->arrival_date) return 0;

                $departureLocal = $this->departure_date->copy()->setTimezone($this->departureAirport->timezone);
                $arrivalLocal   = $this->arrival_date->copy()->setTimezone($this->arrivalAirport->timezone);

                return (int) abs(
                    Carbon::parse($arrivalLocal->toDateString())
                        ->diffInDays(Carbon::parse($departureLocal->toDateString()))
                );
            }
        );
    }

    protected function duration(): Attribute
    {
        return Attribute::make(
            get: fn() => $this->departure_date->diffInMinutes($this->arrival_date)
        );
    }

    protected function durationDisplay(): Attribute
    {
        return Attribute::make(
            get: function () {
                $hours   = intdiv($this->duration, 60);
                $minutes = $this->duration % 60;

                return $hours . 'h ' . str_pad($minutes, 2, '0', STR_PAD_LEFT) . 'm';
            }
        );
    }

    protected function distance(): Attribute
    {
        return Attribute::make(
            get: fn() => $this->calculateGreatCircleDistance()
        );
    }

    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class);
    }

    public function departureAirport(): BelongsTo
    {
        return $this->belongsTo(Airport::class, 'departure_airport_id');
    }

    public function arrivalAirport(): BelongsTo
    {
        return $this->belongsTo(Airport::class, 'arrival_airport_id');
    }

    public function crewType(): BelongsTo
    {
        return $this->belongsTo(CrewType::class);
    }

    public function airline(): BelongsTo
    {
        return $this->belongsTo(Airline::class);
    }


    public function aircraft(): BelongsTo
    {
        return $this->belongsTo(Aircraft::class);
    }

    public function seatType(): BelongsTo
    {
        return $this->belongsTo(SeatType::class);
    }

    public function flightClass(): BelongsTo
    {
        return $this->belongsTo(FlightClass::class);
    }

    public function flightReason(): BelongsTo
    {
        return $this->belongsTo(FlightReason::class);
    }
}