<?php
if ( ! defined( 'ABSPATH' ) )
	exit;

/**
 * Responsive Lightbox Remote Library Unsplash class.
 *
 * Library: https://unsplash.com
 * API: https://unsplash.com/developers
 *
 * @class Responsive_Lightbox_Remote_Library_Unsplash
 */
class Responsive_Lightbox_Remote_Library_Unsplash extends Responsive_Lightbox_Remote_Library_API {

	/**
	 * Class constructor.
	 *
	 * @return void
	 */
	public function __construct() {
		// provider slug
		$this->slug = 'unsplash';

		// provider name
		$this->name = __( 'Unsplash', 'responsive-lightbox' );

		// default values
		$this->defaults = [
			'active'	=> false,
			'api_key'	=> ''
		];

		// setting fields
		$this->fields = [
			'title'		=> $this->name,
			'section'	=> 'responsive_lightbox_remote_library_providers',
			'type'		=> 'custom',
			'callback'	=> [ $this, 'render_field' ]
		];

		// add provider
		parent::add_provider( $this );
	}

	/**
	 * Render field.
	 *
	 * @return void
	 */
	public function render_field() {
		echo '
		<p><label><input id="rl_unsplash_active" class="rl-media-provider-expandable" type="checkbox" name="responsive_lightbox_remote_library[unsplash][active]" value="1" ' . checked( $this->rl->options['remote_library']['unsplash']['active'], true, false ) . ' />' . esc_html__( 'Enable Unsplash.', 'responsive-lightbox' ) . '</label></p>
		<div class="rl-media-provider-options"' . ( $this->rl->options['remote_library']['unsplash']['active'] ? '' : ' style="display: none;"' ) . '>
			<p><input id="rl_unsplash_api_key" class="large-text" placeholder="' . esc_attr__( 'Access key', 'responsive-lightbox' ) . '" type="text" value="' . esc_attr( $this->rl->options['remote_library']['unsplash']['api_key'] ) . '" name="responsive_lightbox_remote_library[unsplash][api_key]"></p>
			<p class="description">' . sprintf( esc_html__( 'Provide your %s key.', 'responsive-lightbox' ), '<a href="https://unsplash.com/oauth/applications/new">Unsplash API</a>' ) . '</p>
		</div>';
	}

	/**
	 * Validate settings.
	 *
	 * @param array $input POST data
	 * @return array
	 */
	public function validate_settings( $input ) {
		if ( ! isset( $_POST['responsive_lightbox_remote_library'] ) )
			$input['unsplash'] = $this->rl->defaults['remote_library']['unsplash'];
		else {
			// active
			$input['unsplash']['active'] = isset( $_POST['responsive_lightbox_remote_library']['unsplash']['active'] );

			// api key
			if ( isset( $_POST['responsive_lightbox_remote_library']['unsplash']['api_key'] ) )
				$api_key = preg_replace( '/[^0-9a-zA-Z\-.]/', '', $_POST['responsive_lightbox_remote_library']['unsplash']['api_key'] );
			else
				$api_key = '';

			$input['unsplash']['api_key'] = $api_key;
		}

		return $input;
	}

	/**
	 * Prepare data to run remote query.
	 *
	 * @param string $search_phrase Search phrase
	 * @param array $args Provider arguments
	 * @return void
	 */
	public function prepare_query( $search_phrase, $args = [] ) {
		// check page parameter
		if ( isset( $args['preview_page'] ) )
			$args['preview_page'] = (int) $args['preview_page'];
		else
			$args['preview_page'] = 1;

		if ( $args['preview_page'] < 1 )
			$args['preview_page'] = 1;

		// check limit
		if ( isset( $args['limit'] ) && ( $limit = (int) $args['limit'] ) > 0 )
			$args['preview_per_page'] = $limit;
		else {
			// check per page parameter
			if ( isset( $args['preview_per_page'] ) )
				$args['preview_per_page'] = (int) $args['preview_per_page'];
			else
				$args['preview_per_page'] = 20;

			if ( $args['preview_per_page'] < 5 || $args['preview_per_page'] > 30 )
				$args['preview_per_page'] = 20;
		}

		// set query arguments
		$this->query_args = $args;

		$query_args = [
			'per_page'	=> $args['preview_per_page'],
			'page'		=> $args['preview_page'],
			'order_by'	=> 'latest'
		];

		if ( $search_phrase !== '' ) {
			$query_args['query'] = urlencode( $search_phrase );

			$url = 'https://api.unsplash.com/search/photos';
		} else
			$url = 'https://api.unsplash.com/photos';

		// set query string
		$this->query = add_query_arg( $query_args, $url );

		// set query remote arguments
		$this->query_remote_args = [
			'timeout'	=> 30,
			'headers'	=> [
				'Authorization'	=> 'Client-ID ' . $this->rl->options['remote_library']['unsplash']['api_key'],
				'User-Agent'	=> __( 'Responsive Lightbox', 'responsive-lightbox' ) . ' ' . $this->rl->defaults['version']
			]
		];
	}

	/**
	 * Get images from media provider.
	 *
	 * @param mixed $response Remote response
	 * @param array $args Query arguments
	 * @return array|WP_Error
	 */
	public function get_query_results( $response, $args = [] ) {
		$results = [];
		$error = new WP_Error( 'rl_remote_library_unsplash_get_query_results', __( 'Parsing request error', 'responsive-lightbox' ) );

		// retrieve body
		$response_body = wp_remote_retrieve_body( $response );

		// any data?
		if ( $response_body !== '' ) {
			$response_json = json_decode( $response_body, true );

			// invalid data?
			if ( $response_json === null )
				$results = $error;
			else {
				// set response data
				$this->response_data = $response_json;

				// search phrase query?
				if ( $args['media_search'] !== '' ) {
					// get results
					$results = isset( $response_json['results'] ) && is_array( $response_json['results'] ) ? $response_json['results'] : [];

					// sanitize images
					$results = $this->sanitize_results( $results );
				} else
					$results = $this->sanitize_results( $response_json );
			}
		} else
			$results = $error;

		return $results;
	}

	/**
	 * Sanitize single result.
	 *
	 * @param array $result Single result
	 * @return array
	 */
	public function sanitize_result( $result ) {
		// set dimensions
		$width = (int) $result['width'];
		$height = (int) $result['height'];
		$thumbnail_width = 200;

		// calculate new height based on original ratio
		$thumbnail_height = (int) floor( $thumbnail_width / ( $width / $height ) );

		$imagedata = [
			'id'					=> 0,
			'link'					=> '',
			'source'				=> esc_url_raw( $result['links']['html'] ),
			'title'					=> sanitize_text_field( $result['id'] ),
			'caption'				=> $this->get_attribution( 'Unsplash', $result['links']['html'], $result['user']['name'], $result['user']['links']['html'] ),
			'description'			=> ! empty( $result['description'] ) ? sanitize_text_field( $result['description'] ) : '',
			'alt'					=> '',
			'url'					=> esc_url_raw( $result['urls']['raw'] ),
			'width'					=> $width,
			'height'				=> $height,
			'orientation'			=> $height > $width ? 'portrait' : 'landscape',
			'thumbnail_url'			=> esc_url_raw( $result['urls']['small'] ),
			'thumbnail_width'		=> $thumbnail_width,
			'thumbnail_height'		=> $thumbnail_height,
			'thumbnail_orientation'	=> $thumbnail_height > $thumbnail_width ? 'portrait' : 'landscape',
			'media_provider'		=> 'unsplash',
			'filename'				=> basename( sanitize_file_name( $result['urls']['raw'] ) ),
			'dimensions'			=> $width . ' x ' . $height,
			'type'					=> 'image'
		];

		// create thumbnail link
		$imagedata['thumbnail_link'] = $this->rl->galleries->get_gallery_image_link( $imagedata, 'thumbnail' );

		return $imagedata;
	}
}

new Responsive_Lightbox_Remote_Library_Unsplash();