<?php

namespace ActivityPhp\Server\Http;

use Exception;

/**
 * A simple WebFinger container of data.
 */
class WebFinger
{
	/** @var string */
	protected $subject;

	/** @var string[] */
	protected $aliases = [];

	/** @var array */
	protected $links = [];


	/**
	 * Construct WebFinger instance
	 *
	 * @param array $data A WebFinger response
	 */
	public function __construct(array $data)
	{
		foreach (['subject', 'aliases', 'links'] as $key) {
		    if (!isset($data[$key])) {
		        throw new Exception(
		            "WebFinger profile must contain '$key' property"
		        );
		    }
		    $method = 'set' . ucfirst($key);
		    $this->$method($data[$key]);
		}
	}


	/**
	 * Set subject property
	 *
	 * @param string $subject
	 */
	protected function setSubject($subject)
	{
		if (!is_string($subject)) {
		    throw new Exception(
		        "WebFinger subject must be a string"
		    );
		}

		$this->subject = $subject;
	}


	/**
	 * Set aliases property
	 *
	 * @param array $aliases
	 */
	protected function setAliases(array $aliases)
	{
		foreach ($aliases as $alias) {
		    if (!is_string($alias)) {
		        throw new Exception(
		            "WebFinger aliases must be an array of strings"
		        );
		    }

		    $this->aliases[] = $alias;
		}
	}


	/**
	 * Set links property
	 *
	 * @param array $links
	 */
	protected function setLinks(array $links)
	{
		foreach ($links as $link) {
		    if (!is_array($link)) {
		        throw new Exception(
		            "WebFinger links must be an array of objects"
		        );
		    }

		    if (!isset($link['rel'])) {
		        throw new Exception(
		            "WebFinger links object must contain 'rel' property"
		        );
		    }

		    $tmp = [];
		    $tmp['rel'] = $link['rel'];

		    foreach (['type', 'href', 'template'] as $key) {
		        if (isset($link[$key]) && is_string($link[$key])) {
		            $tmp[$key] = $link[$key];
		        }
		    }

		    $this->links[] = $tmp;
		}
	}


	/**
	 * Get ActivityPhp profile id URL
	 *
	 * @return string
	 */
	public function getProfileId()
	{
		foreach ($this->links as $link) {
		    if (isset($link['rel'], $link['type'], $link['href'])) {
		        if ($link['rel'] == 'self'
		            && $link['type'] == 'application/activity+json'
		        ) {
		            return $link['href'];
		        }
		    }
		}
	}


	/**
	 * Get WebFinger response as an array
	 *
	 * @return array
	 */
	public function toArray()
	{
		return [
		    'subject' => $this->subject,
		    'aliases' => $this->aliases,
		    'links'   => $this->links
		];
	}


	/**
	 * Get aliases
	 *
	 * @return array
	 */
	public function getAliases()
	{
		return $this->aliases;
	}


	/**
	 * Get links
	 *
	 * @return array
	 */
	public function getLinks()
	{
		return $this->links;
	}


	/**
	 * Get subject fetched from profile
	 *
	 * @return null|string Subject
	 */
	public function getSubject()
	{
		return $this->subject;
	}


	/**
	 * Get subject handle fetched from profile
	 *
	 * @return null|string
	 */
	public function getHandle()
	{
		return substr($this->subject, 5);
	}
}
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