<?php

namespace App\Widgets;

use App\Interfaces\Widget;
use App\Support\Http;
use App\Support\Units\Distance;
use App\Support\Units\Temperature;
use Illuminate\Support\Facades\Cache;
use MetarDecoder\MetarDecoder;
use SimpleXMLElement;

/**
 * This is a widget for the 3rd party CheckWX service
 * @package App\Widgets
 */
class Weather extends Widget
{
    protected $config = [
        'icao' => null,
    ];

    public const URL = 'https://avwx.rest/api/metar/';

    /**
     * Determine the category depending on the rules for visibility/ceiling
     * https://www.aviationweather.gov/cva/help
     * @param $metar
     * @return string
     */
    protected function determineCategory($metar): string
    {
        $category = 'VFR';

        $visibility = 10; // assume it's ok and VFR
        $vis = $metar->getVisibility();
        if($vis) {
            $vis = $vis->getVisibility();
            if($vis) {
                $visibility = $vis->getValue();
            }
        }

        $ceiling = $metar->getClouds();
        if ($ceiling && count($ceiling) > 0) {
            $ceiling = $ceiling[0]->getBaseHeight()->getValue();
        } else {
            $ceiling = 1000;
        }

        if ($visibility < 3 || $ceiling < 1000) {
            $category = 'IFR';
        }

        return $category;
    }

    /**
     * Attempt to get the data from the CheckWX API
     */
    public function run()
    {
        /**
         * @var \App\Interfaces\Metar
         */
        $klass = config('phpvms.metar');
        $metar_class = new $klass;
        $raw_metar = $metar_class->get_metar($this->config['icao']);

        if(!$raw_metar || $raw_metar === '') {
            $category = null;
            $metar = null;
        } else {
            // Run through this parser
            $decoder = new MetarDecoder();
            $metar = $decoder->parse($raw_metar);


            // Determine the flight category that's allowed
            // Just check if we need to be under IFR conditions
            $category = $this->determineCategory($metar);
        }

        return view('widgets.weather', [
            'config'    => $this->config,
            'category'  => $category,
            'metar'     => $metar,
            'unit_alt'  => setting('units.altitude'),
            'unit_dist' => setting('units.distance'),
            'unit_temp' => setting('units.temperature'),
        ]);
    }
}