<?php

namespace WP_Rocket\ThirdParty\Hostings;

use WP_Rocket\Engine\CDN\Context;
use WP_Rocket\Event_Management\Subscriber_Interface;
use WP_Rocket\ThirdParty\ReturnTypesTrait;

/**
 * Subscriber for compatibility with One.com hosting.
 *
 * @since 3.12.1
 */
class OneCom implements Subscriber_Interface {
	use ReturnTypesTrait;

	/**
	 * Array of events this subscriber wants to listen to.
	 *
	 * @since 3.6.3
	 *
	 * @return array
	 */
	public static function get_subscribed_events() {
		return [
			'pre_get_rocket_option_cdn_cnames'        => 'maybe_update_cdn_cname',
			'pre_get_rocket_option_cdn_zone'          => 'maybe_update_cdn_zone',
			'rocket_cdn_reject_files'                 => 'exclude_from_cdn',
			'rocket_disable_cdn_option_change'        => 'is_oc_cdn_enabled',
			'do_rocket_varnish_http_purge'            => 'is_varnish_active',
			'rocket_varnish_field_settings'           => 'maybe_set_varnish_addon_title',
			'rocket_display_input_varnish_auto_purge' => 'should_display_varnish_auto_purge_input',
			'rocket_display_rocketcdn_cta'            => 'return_false',
			'rocket_display_rocketcdn_status'         => 'return_false',
			'rocket_cdn_driver_sections'              => [ 'disable_cdn_mode_toggle', PHP_INT_MAX ],
			'rocket_hide_rocketcdn_notices'           => 'return_true',
			'pre_get_rocket_option_cdn_type'          => 'disable_rocketcdn_tab',
			'pre_get_rocket_option_cdn_state'         => 'maybe_set_cdn_state',
			'rocket_display_cdn_mode_toggle'          => [ 'maybe_display_cdn_mode_toggle', 10, 2 ],
		];
	}

	/**
	 * Check if one.com cdn is enabled.
	 *
	 * @return boolean
	 */
	public function is_oc_cdn_enabled(): bool {
		return rocket_get_constant( 'vcaching', false ) && rest_sanitize_boolean( get_option( 'oc_cdn_enabled' ) );
	}

	/**
	 * Update CNAME
	 *
	 * @param array|null $cname CDN CNAME.
	 * @return array|null
	 */
	public function maybe_update_cdn_cname( ?array $cname ) {
		return $this->is_oc_cdn_enabled() ? [ $this->build_cname() ] : $cname;
	}

	/**
	 * Update CDN Zones.
	 *
	 * @param array|null $zone CDN ZONES.
	 * @return array|null
	 */
	public function maybe_update_cdn_zone( ?array $zone ) {
		return $this->is_oc_cdn_enabled() ? [ 'all' ] : $zone;
	}

	/**
	 * Exclude files from being rewritten.
	 * From 3.12.5.2 we are excluding new wp-content directory paths if it's not the normal one.
	 *
	 * @param array $files Array of files to be excluded.
	 * @return array
	 */
	public function exclude_from_cdn( array $files ): array {
		if ( ! $this->is_oc_cdn_enabled() ) {
			return $files;
		}

		$files[] = '/wp-includes/(.*)';

		return $files;
	}

	/**
	 * Disables the CDN mode toggle for all CDN driver sections.
	 *
	 * When One.com's own CDN handling is active, WP Rocket's CDN mode toggle
	 * (BYOCDN, RocketCDN Free, RocketCDN Paid) must not be switchable — One.com
	 * manages CDN delivery itself, so letting a user flip WP Rocket's own CDN
	 * modes on top of it would conflict.
	 *
	 * @param array $sections CDN sections data.
	 * @return array
	 */
	public function disable_cdn_mode_toggle( array $sections ): array {
		if ( ! $this->is_oc_cdn_enabled() ) {
			return $sections;
		}

		$cdn_sections = [
			'cdn',
			'rocketcdn_paid',
			'rocketcdn_free',
		];

		foreach ( $cdn_sections as $cdn_section ) {
			$cdn_section_key = $cdn_section . '_section';

			if ( ! isset( $sections[ $cdn_section_key ] ) ) {
				continue;
			}

			$sections[ $cdn_section_key ]['is_forced_off'] = true;

			// Hide the "Your CDN is active" status indicator; one.com manages the CDN.
			if ( isset( $sections[ $cdn_section_key ]['status_indicator'] ) ) {
				$sections[ $cdn_section_key ]['status_indicator']['is_active'] = false;
			}
		}

		return $sections;
	}

	/**
	 * Purge varnish cache.
	 *
	 * @return boolean
	 */
	public function should_display_varnish_auto_purge_input(): bool {
		return ! $this->is_varnish_active();
	}

	/**
	 * Set varnish addon title
	 *
	 * @param array $settings Varnish settings field data.
	 * @return array
	 */
	public function maybe_set_varnish_addon_title( array $settings ): array {

		// Bail out if varnish is disabled.
		if ( ! $this->is_varnish_active() ) {
			return $settings;
		}

		$settings['varnish_auto_purge']['title'] = sprintf(
			// Translators: %s = Hosting name.
				__( 'Your site is hosted on %s, we have enabled Varnish auto-purge for compatibility.', 'rocket' ),
				'One.com'
			);

		return $settings;
	}

	/**
	 * Check if varnish option is enabled.
	 *
	 * @return boolean
	 */
	public function is_varnish_active() {
		return rocket_get_constant( 'vcaching', false ) && rest_sanitize_boolean( get_option( 'varnish_caching_enable' ) );
	}

	/**
	 * Build CDN CNAME.
	 *
	 * @return string
	 */
	public function build_cname(): string {
		if ( ! isset( $_SERVER['ONECOM_DOMAIN_NAME'] ) && ! isset( $_SERVER['HTTP_HOST'] ) ) {
			return '';
		}

		$domain_name = sanitize_text_field( wp_unslash( $_SERVER['ONECOM_DOMAIN_NAME'] ) );
		$http_host   = sanitize_text_field( wp_unslash( $_SERVER['HTTP_HOST'] ) );

		$is_subdomain = '' === str_replace( $domain_name, '', $http_host ) ? false : true;
		return $is_subdomain ? "usercontent.one/wp/$http_host" : "usercontent.one/wp/www.$http_host";
	}

	/**
	 * Disable rocketcdn tab completely.
	 *
	 * @return string
	 */
	public function disable_rocketcdn_tab() {
		return 'byocdn';
	}

	/**
	 * Force the CDN state to BYOCDN when one.com's own CDN handling is active.
	 *
	 * @param string|null $cdn_state CDN state.
	 * @return string|null
	 */
	public function maybe_set_cdn_state( ?string $cdn_state ) {
		return $this->is_oc_cdn_enabled() ? Context::BYOCDN_TYPE : $cdn_state;
	}

	/**
	 * Show the CDN mode toggles only when one.com's own CDN handling is active.
	 *
	 * @param bool   $show CDN mode toggle would be displayed.
	 * @param string $mode CDN mode identifier (rocketcdn_free|rocketcdn_paid|byocdn).
	 * @return bool
	 */
	public function maybe_display_cdn_mode_toggle( $show, $mode ): bool {
		return ! $this->is_oc_cdn_enabled();
	}
}