<?php
namespace pvv\side;

use \DateTimeImmutable;
use \PDO;

class DBActivity implements Activity {

	public function __construct(PDO $pdo) {
		$this->pdo = $pdo;
	}

	public function getNextEventFrom(DateTimeImmutable $date) {
		$query = 'SELECT name,start,stop,organiser,location FROM events WHERE start > :date ORDER BY start ASC LIMIT 1';
		return $this->retrieve($date, $query);
	}

	public function getPreviousEventFrom(DateTimeImmutable $date) {
		$query = 'SELECT name,start,stop,organiser,location FROM events WHERE start < :date ORDER BY start DESC LIMIT 1';
		return $this->retrieve($date, $query);
	}

	private function retrieve($date, $query) {
		$stmt = $this->pdo->prepare($query);
		$stmt->execute(['date' => $date->format('Y-m-d H:i:s')]);
		if ($result = $stmt->fetch(PDO::FETCH_ASSOC)){
			$ev = new OnceEvent(
				$result['name'],
				DateTimeImmutable::createFromFormat('Y-m-d H:i:s', $result['start']),
				DateTimeImmutable::createFromFormat('Y-m-d H:i:s', $result['stop']),
				$result['organiser'],
				$result['location']
			);
			return $ev;
		}
		return null;
	}

	public function getName() /* : string */ {
		return "Database";
	}

	public function getLocation() /* : Location */ {
		return "Location";
	}

	public function getOrganiser() /* : User */ {
		return "User";
	}

}