<?php

namespace Arcanedev\Gravatar;

use Arcanedev\Gravatar\Contracts\Gravatar as GravatarContract;
use Arcanedev\Gravatar\Helpers\NumberChecker;
use Arcanedev\Html\Elements\Img;
use Illuminate\Support\Arr;

/**
 * Class     Gravatar
 *
 * @author   ARCANEDEV <arcanedev.maroc@gmail.com>
 */
class Gravatar implements GravatarContract
{
	use Concerns\HashEmail;

	const BASE_URL = 'http://www.gravatar.com/avatar/';
	const SECURE_URL = 'https://secure.gravatar.com/avatar/';

	/**
	 * The default image to use (gravatar-recognized type, url or false = default gravatar image)
	 *
	 * @var mixed
	 */
	protected $defaultImage = false;

	/**
	 * The maximum rating to allow for the avatar.
	 *
	 * @var string
	 */
	protected $rating = 'g';

	/**
	 * The avatar size.
	 *
	 * @var int
	 */
	protected $size = 80;

	/**
	 * Should we use the secure (HTTPS) URL base ?
	 *
	 * @var bool
	 */
	protected $secure = false;

	/**
	 * A temporary internal cache of the URL parameters.
	 *
	 * @var array|null
	 */
	protected $cachedParams = null;

	/**
	 * Supported image defaults.
	 *
	 * @var array
	 */
	private $supportedImages = [
	    '404', 'mp', 'identicon', 'monsterid', 'wavatar', 'retro', 'robohash', 'blank',
	];

	/**
	 * Supported image ratings.
	 *
	 * @var array
	 */
	private $supportedRatings = [
	    'g', 'pg', 'r', 'x'
	];


	/**
	 * Make a gravatar instance.
	 *
	 * @param  string  $default
	 * @param  int     $size
	 * @param  string  $rating
	 */
	public function __construct($default = 'identicon', $size = 80, $rating = 'g')
	{
		$this->setDefaultImage($default);
		$this->setSize($size);
		$this->setRating($rating);
		$this->enableSecure();
	}


	/**
	 * Get the current default image setting.
	 *
	 * @return string|false
	 */
	public function getDefaultImage()
	{
		return $this->defaultImage;
	}


	/**
	 * Set the default image to use for avatars.
	 *
	 * @param  string|false  $image
	 *
	 * @return $this
	 *
	 * @throws \Arcanedev\Gravatar\Exceptions\InvalidImageUrlException
	 */
	public function setDefaultImage($image)
	{
		if ($image !== false) {
		    $this->cachedParams = null;

		    $image = in_array(strtolower($image), $this->supportedImages)
		        ? strtolower($image)
		        : $this->checkImageUrl($image);
		}

		$this->defaultImage = $image;

		return $this;
	}


	/**
	 * Get the currently set avatar size.
	 *
	 * @return int
	 */
	public function getSize()
	{
		return $this->size;
	}


	/**
	 * Set the avatar size to use.
	 *
	 * @param  int  $size - The avatar size to use, must be less than 512 and greater than 0.
	 *
	 * @return $this
	 *
	 * @throws \Arcanedev\Gravatar\Exceptions\InvalidImageSizeException
	 */
	public function setSize($size)
	{
		$this->cachedParams = null;

		$this->checkSize($size);

		$this->size = $size;

		return $this;
	}


	/**
	 * Get the current maximum allowed rating for avatars.
	 *
	 * @return string
	 */
	public function getRating()
	{
		return $this->rating;
	}


	/**
	 * Set the maximum allowed rating for avatars.
	 *
	 * @param  string  $rating
	 *
	 * @return $this
	 *
	 * @throws \Arcanedev\Gravatar\Exceptions\InvalidImageRatingException
	 */
	public function setRating($rating)
	{
		$this->cachedParams = null;

		$rating = strtolower($rating);

		if ( ! in_array($rating, $this->supportedRatings))
		    throw Exceptions\InvalidImageRatingException::make($rating);

		$this->rating = $rating;

		return $this;
	}


	/**
	 * Check if we are using the secure protocol for the image URLs.
	 *
	 * @return bool
	 */
	public function isSecured(): bool
	{
		return $this->secure;
	}


	/**
	 * Get Gravatar image source.
	 *
	 * @param  string       $email
	 * @param  int|null     $size
	 * @param  string|null  $rating
	 *
	 * @return string
	 */
	public function src($email, $size = null, $rating = null): string
	{
		if (is_null($size)) {
		    $size = $this->getSize();
		}

		$size = max(1, min(512, $size));

		$this->setSize($size);

		if ( ! is_null($rating)) {
		    $this->setRating($rating);
		}

		return $this->get($email);
	}


	/**
	 * Get the avatar URL based on the provided email address.
	 *
	 * @param  string  $email
	 * @param  bool    $hash
	 *
	 * @return string
	 */
	public function get($email, $hash = true): string
	{
		$url  = $this->isSecured() ? static::SECURE_URL : static::BASE_URL;
		$url .= empty($email)
		    ? str_repeat('0', 32)
		    : ($hash ? static::hashEmail($email) : $email);

		$params = $this->getParams($email);

		return $url.'?'.http_build_query($params);
	}


	/**
	 * Get Gravatar image tag.
	 *
	 * @param  string       $email
	 * @param  string|null  $alt
	 * @param  array        $attributes
	 * @param  string|null  $rating
	 *
	 * @return \Arcanedev\Html\Elements\Img
	 */
	public function image($email, $alt = null, array $attributes = [], $rating = null)
	{
		$dimensions = array_values(
		    Arr::only($attributes, ['width', 'height'])
		);

		$size = count($dimensions)
		    ? min(512, max($dimensions))
		    : $this->getSize();

		return Img::make()
		          ->src($this->src($email, $size, $rating))
		          ->attributeIfNotNull($alt, 'alt', $alt)
		          ->attributes($attributes);
	}


	/**
	 * Get profile's data.
	 *
	 * @param  string      $email
	 * @param  mixed|null  $default
	 *
	 * @return array|mixed
	 */
	public function profile($email, $default = null)
	{
		return (new Profile)->get($email, $default);
	}


	/**
	 * Enable the use of the secure protocol for image URLs.
	 *
	 * @return $this
	 */
	public function enableSecure()
	{
		$this->secure = true;

		return $this;
	}


	/**
	 * Disable the use of the secure protocol for image URLs.
	 *
	 * @return $this
	 */
	public function disableSecure()
	{
		$this->secure = false;

		return $this;
	}


	/**
	 * Check if email has a gravatar.
	 *
	 * @param  string  $email
	 *
	 * @return bool
	 */
	public function exists($email): bool
	{
		$this->setDefaultImage('404');

		$headers = get_headers($this->get($email));

		return strpos($headers[0], '200') ? true : false;
	}


	/**
	 * Get params.
	 *
	 * @param  string  $email
	 *
	 * @return array
	 */
	private function getParams(string $email): array
	{
		$params = $this->cachedParams;

		if (is_null($this->cachedParams)) {
		    $params['s'] = $this->getSize();
		    $params['r'] = $this->getRating();

		    if ($this->getDefaultImage() !== false) {
		        $params['d'] = $this->getDefaultImage();
		    }

		    $this->cachedParams = $params;
		}

		if (empty($email)) {
		    $params['f'] = 'y';
		}

		return (array) $params;
	}


	/**
	 * Check image url.
	 *
	 * @param  string  $image
	 *
	 * @return string
	 *
	 * @throws \Arcanedev\Gravatar\Exceptions\InvalidImageUrlException
	 */
	private function checkImageUrl(string $image): string
	{
		if ( ! filter_var($image, FILTER_VALIDATE_URL)) {
		    throw Exceptions\InvalidImageUrlException::make($image);
		}

		return $image;
	}


	/**
	 * Check the image size.
	 *
	 * @param  int  $size
	 */
	private function checkSize(&$size): void
	{
		if ( ! NumberChecker::isIntValue($size)) {
		    throw new Exceptions\InvalidImageSizeException(
		        'Avatar size specified must be an integer.'
		    );
		}

		$size = (int) $size;

		if ( ! NumberChecker::isIntBetween($size, 0, 512)) {
		    throw new Exceptions\InvalidImageSizeException(
		        'Avatar size must be within 0 pixels and 512 pixels.'
		    );
		}
	}
}
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