<?php
defined( 'ABSPATH' ) || die( 'Cheatin\' uh?' );

/**
 * Class that handles the plugin options.
 *
 * @since 1.7
 */
class Imagify_Options extends Imagify_Abstract_Options {

	/**
	 * Class version.
	 *
	 * @var   string
	 * @since 1.7
	 */
	const VERSION = '1.0';

	/**
	 * Suffix used in the name of the option.
	 *
	 * @var    string
	 * @since  1.7
	 * @access protected
	 */
	protected $identifier = 'settings';

	/**
	 * The default values for the Imagify main options.
	 * These are the "zero state" values.
	 * Don't use null as value.
	 *
	 * @var    array
	 * @since  1.7
	 * @access protected
	 */
	protected $default_values = array(
		'api_key'            => '',
		'optimization_level' => 0,
		'auto_optimize'      => 0,
		'backup'             => 0,
		'resize_larger'      => 0,
		'resize_larger_w'    => 0,
		'exif'               => 0,
		'disallowed-sizes'   => array(),
		'admin_bar_menu'     => 0,
	);

	/**
	 * The Imagify main option values used when they are set the first time or reset.
	 * Values identical to default values are not listed.
	 *
	 * @var    array
	 * @since  1.7
	 * @access protected
	 */
	protected $reset_values = array(
		'optimization_level' => 1,
		'auto_optimize'      => 1,
		'backup'             => 1,
		'admin_bar_menu'     => 1,
	);

	/**
	 * The single instance of the class.
	 *
	 * @var    object
	 * @since  1.7
	 * @access protected
	 */
	protected static $_instance;

	/**
	 * The constructor.
	 * Side note: $this->hook_identifier value is "option".
	 *
	 * @since  1.7
	 * @author Grégory Viguier
	 * @access protected
	 */
	protected function __construct() {
		if ( defined( 'IMAGIFY_API_KEY' ) && IMAGIFY_API_KEY ) {
			$this->default_values['api_key'] = (string) IMAGIFY_API_KEY;
		}

		$this->network_option = imagify_is_active_for_network();

		parent::__construct();
	}

	/**
	 * Get the main Instance.
	 *
	 * @since  1.7
	 * @author Grégory Viguier
	 * @access public
	 *
	 * @return object Main instance.
	 */
	public static function get_instance() {
		if ( ! isset( self::$_instance ) ) {
			self::$_instance = new self();
		}

		return self::$_instance;
	}


	/** ----------------------------------------------------------------------------------------- */
	/** SANITIZATION, VALIDATION ================================================================ */
	/** ----------------------------------------------------------------------------------------- */

	/**
	 * Sanitize and validate an option value. Basic casts have been made.
	 *
	 * @since  1.7
	 * @author Grégory Viguier
	 * @access public
	 *
	 * @param  string $key     The option key.
	 * @param  mixed  $value   The value.
	 * @param  mixed  $default The default value.
	 * @return mixed
	 */
	public function sanitize_and_validate_value( $key, $value, $default ) {
		static $max_sizes;

		switch ( $key ) {
			case 'api_key':
				if ( defined( 'IMAGIFY_API_KEY' ) && IMAGIFY_API_KEY ) {
					return (string) IMAGIFY_API_KEY;
				}
				return $value ? sanitize_key( $value ) : '';

			case 'optimization_level':
				if ( $value < 0 || $value > 2 ) {
					// For an invalid value, return the "reset" value.
					$reset_values = $this->get_reset_values();
					return $reset_values[ $key ];
				}
				return $value;

			case 'auto_optimize':
			case 'backup':
			case 'resize_larger':
			case 'exif':
			case 'admin_bar_menu':
				return 1;

			case 'resize_larger_w':
				if ( $value <= 0 ) {
					// Invalid.
					return 0;
				}
				if ( ! isset( $max_sizes ) ) {
					$max_sizes = get_imagify_max_intermediate_image_size();
				}
				if ( $value < $max_sizes['width'] ) {
					// Invalid.
					return $max_sizes['width'];
				}
				return $value;

			case 'disallowed-sizes':
				if ( ! $value ) {
					return $default;
				}

				$value = array_keys( $value );
				$value = array_map( 'sanitize_text_field', $value );
				return array_fill_keys( $value, 1 );
		}

		return false;
	}

	/**
	 * Validate Imagify's options before storing them. Basic sanitization and validation have been made, row by row.
	 *
	 * @since  1.7
	 * @author Grégory Viguier
	 * @access public
	 *
	 * @param  string $values The option value.
	 * @return array
	 */
	public function validate_values_on_update( $values ) {
		// The max width for the "Resize larger images" option can't be 0.
		if ( empty( $values['resize_larger_w'] ) ) {
			unset( $values['resize_larger'], $values['resize_larger_w'] );
		}

		return $values;
	}
}