<?php

/**
 * Class WPMDB_PHP_Checker
 *
 * Check's to see if a site's PHP version is below self::$min_php, disables WP Migrate Lite/Pro/WPESM if PHP is below minimum
 * Check's to see if a site's WP version is below self::$min_wp, disables WP Migrate Lite/Pro/WPESM if WP is below minimum
 *
 * To increase the required PHP version, change the self::$min_php value here and update
 * the WPMDB_MINIMUM_PHP_VERSION constant in setup-plugin.php
 *
 * To increase the required WP version, change the self::$min_wp value here and update
 * the WPMDB_MINIMUM_WP_VERSION constant in setup-plugin.php
 *
 *
 * For which activation hooks to use:
 *
 * @see https://pento.net/2014/02/18/dont-let-your-plugin-be-activated-on-incompatible-sites/
 */
class WPMDB_Requirements_Checker {

	/**
	 * @var string
	 */
	public $path;

	/**
	 * @var string
	 */
	public static $php_doc_link;

	/**
	 * @var string
	 */
	public static $min_php;

	/**
	 * @var string
	 */
	public static $min_wp;

	/**
	 * @var string
	 */
	private $template = '
		<div class="notice notice-warning is-dismissible">
				<p>%s</p>
		</div>';

	/**
	 * @param string $path
	 * @param string $min_php
	 * @param string $min_wp
	 */
	public function __construct( $path, $min_php, $min_wp ) {
		$this->path         = $path;
		self::$min_wp       = $min_wp;
		self::$min_php      = $min_php; // To increase the minimum PHP required, change this value _AND_ WPMDB_MINIMUM_PHP_VERSION in the main plugin files
		self::$php_doc_link = 'https://deliciousbrains.com/wp-migrate-db-pro/doc/upgrading-php/';

		add_action( 'admin_init', array( $this, 'maybe_deactivate_plugin' ) );
	}

	/**
	 * Checks if the server is running a compatible php version
	 *
	 * @return bool
	 */
	private function is_php_compatible() {
		return version_compare( PHP_VERSION,
				self::$min_php,
				'>=' ) || ! is_plugin_active( plugin_basename( $this->path ) );
	}

	/**
	 * Checks if the site is running a compatible WordPress version
	 *
	 * @return bool
	 */
	private function is_wp_compatible() {
		return version_compare( get_bloginfo( 'version' ),
				self::$min_wp,
				'>=' ) || ! is_plugin_active( plugin_basename( $this->path ) );
	}

	/**
	 * Deactivate the plugin if running on an unsupported version of WP or PHP
	 *
	 * @return void
	 */
	public function maybe_deactivate_plugin() {
		$deactivate = false;

		if ( ! $this->is_php_compatible() ) {
			$deactivate = true;
			add_action( 'admin_notices', [ $this, 'incompatible_php_version_notice' ] );
		}

		if ( ! $this->is_wp_compatible() ) {
			$deactivate = true;
			add_action( 'admin_notices', [ $this, 'incompatible_wp_version_notice' ] );
		}

		if ( true === $deactivate ) {
			deactivate_plugins( plugin_basename( $this->path ) );

			if ( isset( $_GET['activate'] ) ) {
				unset( $_GET['activate'] );
			}
		}
	}

	/**
	 * Displays incompatible PHP admin notice
	 *
	 * @handles admin_notices
	 * @return void
	 */
	public function incompatible_php_version_notice() {
		$message = sprintf(
			__(
				'%s requires PHP version %s or higher to run and has been deactivated. You are currently running version %s.',
				'wp-migrate-db'
			),
			WPMDB_PLUGIN_TITLE,
			self::$min_php,
			PHP_VERSION
		);

		echo sprintf( $this->template, $message );
	}

	/**
	 * Displays incompatible WP admin notice
	 *
	 * @handles admin_notices
	 * @return void
	 */
	public function incompatible_wp_version_notice() {
		$message = sprintf(
			__(
				'%s requires WordPress version %s or higher to run and has been deactivated. You are currently running version %s.',
				'wp-migrate-db'
			),
			WPMDB_PLUGIN_TITLE,
			self::$min_wp,
			get_bloginfo( 'version' )
		);

		echo sprintf( $this->template, $message );
	}
}