<?php

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

use App\Yr\Forecast;
use App\Yr\Forecast\Tabular;
use App\Yr\Forecast\Tabular\Time\Symbol;
use App\Yr\Forecast\Tabular\Time\Temperature;
use App\Yr\Forecast\Tabular\Time\WindDirection;
use App\Yr\Forecast\Tabular\Time\WindSpeed;

require __DIR__ . '/vendor/autoload.php';

class TextForcast {

    private $forecast;

    public function __construct(Tabular $t) {
        $this->forecast = $t; 
    }

    /**
     * «Tonight Southeasterly light breeze, cloudy, temperature -8 to  -9 degrees»
     * @author Helge Tangen
     */
    public function start(): string {
        $time = $this->forecast->getVariations()->getTime();
        return sprintf(
            "%s from %s (%s) %s",
            $this->when($time->getFrom()), 
            $time->getFrom()->format('H'),
            $time->getFrom()->format('h a'),
            (function() use ($time){
                $str = [];

                $prev = null;
                foreach ($time as $data) {
                    switch (get_class($data)) {
                    case Symbol::class:
                        $str[] = ($prev == null ? ' ' : ', ') . $data->getName();
                        break;
                    case WindSpeed::class:
                        $str[] = ($prev == null || WindSpeed::class ? " " : ", ") . $data->getName();
                        break;
                    case WindDirection::class:
                        $str[] = ($prev == null ? ' ' : ', ') . $data->getName();
                        break;
                    case Temperature::class:
                        $data = $data->convertTo(Temperature::UNIT_KELVIN);
                        $str[] = ($prev == null ? ' ' : ', ') . sprintf('%d %s', $data->getValue(), $data->getDegree());
                        break;
                    default:
                        //$str []= '``' .  get_class($data) . '`` missing';
                    }
                    $prev = $data;
                }

                $last = array_pop($str);

                if (substr($last, 0, 1) == ',')
                    $last = substr($last, 1);

                if (sizeof($str) == 0)
                    return strtolower($last);

                return strtolower(sprintf(
                    "%s and %s", 
                    join($str), $last
                ));
            })()
        );
    }

    public function when(\DateTimeInterface $d): string {
        $diff = $d->diff(new \DateTime());

        if ($diff->invert && $diff->days == 1)
            return sprintf("yesterday %s", $this->period($d));
        elseif (!$diff->invert && $diff->days == 1)
            return sprintf("tomorrow %s", $this->period($d));
        elseif ($diff->days == 0)
            return sprintf("This %s", $this->period($d));

        return sprintf("the %s at %s of %s %y ",
            $this->period($d),
            $d->format('dd'), $d->format('m'), $d->format('YY')
        );
    }

    public function period(\DateTimeInterface $d): string {
        $hour = (int)$d->format('H');
        if ($hour >= 6 && $hour <= 11)
            return "morning";
        elseif ($hour == 12)
            return "noon";
        elseif ($hour > 12 && $hour < 18)
            return "afternoon";
        elseif ($hour >= 18 && $hour < 24)
            return "evening";
        elseif ($hour == 12)
            return "midning";
        else
            return "night";
    }

    public function since(\DateTimeInterface $d): string {
    
    }
}

$url = 'https://www.yr.no/place/Norway/Troms/Tromsø/Tromsø/forecast_hour_by_hour.xml';

$forecast = new Forecast($url);

$range = $forecast->getTabular()->getBetween(
    $forecast->getSunset(), $forecast->getSunrise()->add(new \DateInterval('P1D'))
);

echo (new TextForcast($range))->start();
?>