<?php

namespace App\Yr\Forecast;

use App\Yr\Forecast\Tabular\Statistics;
use App\Yr\Forecast\Tabular\Time;

class Tabular implements \IteratorAggregate {

    private $time = [];
    private $stats;

    public function __construct(?\SimpleXMLElement $xml) {
        $this->stats = new Statistics();

        if ($xml != null)
            foreach ($xml->time as $time)
                $this->addTime(new Time($time));
    }

    protected function addTime(Time $time): self {
        $this->time[] = $time;
        $this->stats->analyse($time);
        return $this;
    }

    public function getStatistics(): array {
        return $this->stats;
    }

    public function getBetween(\DateTimeInterface $from, \DateTimeInterface $until): self {
        $n = new Tabular(null);

        foreach ($this as $time)
            if ($time->getFrom() >= $from && $time->getUntil() <= $until)
                $n->addTime($time);

        return $n;
    }

    public function getIterator(): \Generator {
        foreach ($this->time as $time)
            yield $time;
    }
}