<?php

require_once('Message.class.php');

function compareMsgDate ($msg1, $msg2) {

	return ($msg1->getDate() < $msg2->getDate()) ? -1 : 1;
}

class Conversation {

	private $messages = [];

	private $firstMessage;

	private $lastMessage;

	private $convTitle;

	private $penpalPubkey;


	public function __construct () {

	}

	public function addMessage ($msg) {

		$this->messages[] = $msg;

		if (!isset($this->lastMessage, $this->firstMessage)) {

			$this->lastMessage = $msg;
			$this->firstMessage = $msg;

		} else {

			if ($msg->getDate() > $this->lastMessage->getDate()) {

				$this->lastMessage = $msg;
			}

			if ($msg->getDate() < $this->firstMessage->getDate()) {

				$this->firstMessage = $msg;
			}
		}
	}

	public function sortMessages () {

		uasort($this->messages, 'compareMsgDate');

	}

	public function getConvTitle () {

		if (!isset($this->convTitle)) {
			
			$this->convTitle = $this->getFirstMessage()->getTitle();
		}

		return $this->convTitle; 
	}

	public function getPenpalPubkey () {

		if (!isset($this->penpalPubkey)) {

			$this->penpalPubkey = $this->getFirstMessage()->getPenpalPubkey();
		}

		return $this->penpalPubkey; 
	}

	public function getMessages () {

		return $this->messages;
	}

	public function getFirstMessage () {

		return $this->firstMessage;
	}

	public function getLastMessage () {

		return $this->lastMessage;
	}
}