<?php
namespace Upress\EzCache;

class Settings {
    /** @var object */
    protected static $settings;

	/**
     * Get the path to the config file
	 * @return string
	 */
	protected static function settings_file_path() {
        return WP_CONTENT_DIR . '/ezcache-config.json';
    }

    public static function get_default_settings() {
	    return (object) [
		    'no_cache_known_users'  => true,
		    'separate_mobile_cache' => true,
		    'cache_lifetime'        => 604800,
		    'cache_expiry_interval' => 10800,

		    'disable_wp_emoji'        => false,
		    'optimize_google_fonts'   => false,
		    'minify_html'             => false,
		    'minify_html_comments'    => true,
		    'minify_inline_js'        => false,
		    'minify_inline_css'       => false,
		    'minify_js'               => false,
		    'combine_head_js'         => false,
		    'combine_body_js'         => false,
		    'minify_css'              => false,
		    'combine_css'             => false,
		    'enable_webp_support'     => true,

		    'no_cache_query_params'    => false,
		    'cache_clear_on_post_edit' => true,
		    'bypass_cache'             => [
			    'single'    => false,
			    'pages'     => false,
			    'frontpage' => false,
			    'home'      => false,
			    'archives'  => false,
			    'tag'       => false,
			    'category'  => false,
			    'feed'      => false,
			    'search'    => false,
			    'author'    => false,
		    ],
		    'rejected_uri'             => "/cart\n/checkout",
		    'rejected_user_agent'      => '',
		    'rejected_cookies'         => '',
	    ];
    }

	/**
     * Get the settings stored in the config file
	 * @return object
	 */
	public static function get_settings() {

	    if ( self::$settings ) {
	        return self::$settings;
        }

        $file = self::settings_file_path();
		$default_settings = self::get_default_settings();

        if ( ! file_exists( $file ) || ! $json = json_decode( file_get_contents( $file ) ) ) {
	        self::$settings = $default_settings;
            file_put_contents( $file, json_encode( self::$settings ) );

	        return self::$settings;
        }

		self::$settings = (object) array_merge( (array) $default_settings, (array) $json );
        return self::$settings;
    }

	/**
     * Merge new settings into the settings file
	 * @param array $new_settings
	 * @return object
	 */
	public static function set_settings( $new_settings=[] ) {
        $settings = self::get_settings();

        foreach( $new_settings as $key => $value ) {
	        $settings->{$key} = $value;
        }

        self::maybe_update_cronjobs( $settings );

        file_put_contents( self::settings_file_path(), json_encode( $settings ) );
		self::$settings = $settings;
        return $settings;
    }

	/**
	 * @param $settings
	 */
	public static function maybe_update_cronjobs( $settings ) {
		if ( wp_next_scheduled( 'ezcache_clear_expired_cache' ) ) {
			wp_clear_scheduled_hook( 'ezcache_clear_expired_cache' );
		}

		if ( $settings->cache_lifetime > 0 ) {
			$schedules = wp_get_schedules();
			foreach( $schedules as $key=>$s ) {
				if( $s['interval'] == $settings->cache_expiry_interval ) {
					if ( ! wp_next_scheduled( 'ezcache_clear_expired_cache' ) ) {
						wp_schedule_event( time(), $key, 'ezcache_clear_expired_cache' );
					}
					break;
				}
			}
		}
	}
}