<?php
/**
 * Gitium provides automatic git version control and deployment for
 * your plugins and themes integrated into wp-admin.
 *
 * Copyright (C) 2014-2025 PRESSINFRA SRL <ping@presslabs.com>
 *
 * Gitium is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * any later version.
 *
 * Gitium is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Gitium. If not, see <http://www.gnu.org/licenses/>.
 *
 * @package         Gitium
 */

class Gitium_Requirements {

	private $req = array();
	private $msg = array();

	/**
	 * Gitium requires:
	 * git min version
	 * the function proc_open available
	 * PHP min version
	 * can exec the file inc/ssh-git
	 */
	public function __construct() {
		$this->_check_req();
		add_action( GITIUM_ADMIN_NOTICES_ACTION, array( $this, 'admin_notices' ) );
	}

	private function _check_req() {
		list($this->req['is_git_version'],       $this->msg['is_git_version']       ) = $this->is_git_version();
		list($this->req['is_proc_open'],         $this->msg['is_proc_open']         ) = $this->is_proc_open();
		list($this->req['is_php_verion'],        $this->msg['is_php_verion']        ) = $this->is_php_version();
		list($this->req['can_exec_ssh_git_file'],$this->msg['can_exec_ssh_git_file']) = $this->can_exec_ssh_git_file();

		return $this->req;
	}

	public function admin_notices() {
		if ( ! current_user_can( GITIUM_MANAGE_OPTIONS_CAPABILITY ) ) {
			return;
		}

		foreach ( $this->req as $key => $value ) {
			if ( false === $value ) {
				echo "<div class='error-nag error'><p>Gitium Requirement: {$this->msg[$key]}</p></div>";
			}
		}
	}

	public function get_status() {
		$requirements = $this->req;

		foreach ( $requirements as $req ) :
			if ( false === $req ) :
				return false;
			endif;
		endforeach;

		return true;
	}

	private function is_git_version() {
		$git_version = get_transient( 'gitium_git_version' );

		if ( GITIUM_MIN_GIT_VER > substr( $git_version, 0, 3 ) ) {
			global $git;
			$git_version = $git->get_version();
			set_transient( 'gitium_git_version', $git_version );
			if ( empty( $git_version ) ) {
				return array( false, 'There is no git installed on this server.' );
			} else if ( GITIUM_MIN_GIT_VER > substr( $git_version, 0, 3 ) ) {
				return array( false, "The git version is `$git_version` and must be greater than `" . GITIUM_MIN_GIT_VER . "`!" );
			}
		}

		return array( true, "The git version is `$git_version`." );
	}

	private function is_proc_open() {
		if ( ! function_exists( 'proc_open' ) ) {
			return array( false, 'The function `proc_open` is disabled!' );
		} else {
			return array( true, 'The function `proc_open` is enabled!' );
		}
	}

	private function is_php_version() {
		if ( ! function_exists( 'phpversion' ) ) {
			return array( false, 'The function `phpversion` is disabled!' );
		} else {
			$php_version = phpversion();
			if ( GITIUM_MIN_PHP_VER <= substr( $php_version, 0, 3 ) ) {
				return array( true, "The PHP version is `$php_version`." );
			} else {
				return array( false, "The PHP version is `$php_version` and is not greater or equal to " . GITIUM_MIN_PHP_VER );
			}
		}
	}

	private function can_exec_ssh_git_file() {
		$filepath = dirname( __FILE__ ) . '/ssh-git';

		if ( ! function_exists( 'is_executable' ) ) {
			return array( false, 'The function `is_executable` is disabled!' );
		} else if ( is_executable( $filepath ) ) {
			return array( true, "The `$filepath` file can be executed!" );
		} else {
			return array( false, "The `$filepath` file is not executable" );
		}
	}
}