/application/modules/setup/controllers/setup.php

<?php

if (!defined('BASEPATH'))
    exit('No direct script access allowed');

/*
 * FusionInvoice
 * 
 * A free and open source web based invoicing system
 *
 * @package		FusionInvoice
 * @author		Jesse Terry
 * @copyright	Copyright (c) 2012 - 2013 FusionInvoice, LLC
 * @license		http://www.fusioninvoice.com/license.txt
 * @link		http://www.fusioninvoice.com
 * 
 */

class Setup extends MX_Controller {

	public $errors = 0;

	public function __construct()
	{
		parent::__construct();

		$this->load->library('session');

		$this->load->helper('file');
		$this->load->helper('directory');
		$this->load->helper('url');
		$this->load->helper('language');

		$this->load->model('mdl_setup');

		$this->load->module('layout');

		if (!$this->session->userdata('fi_lang'))
		{
			$this->session->set_userdata('fi_lang', 'italian');	//---it---
		}

		$this->lang->load('fi', $this->session->userdata('fi_lang'));
		
		
		//---it---inizio
		if ($this->session->userdata('fi_lang') == 'italian')
			$this->lang->load('custom', $this->session->userdata('fi_lang'));
		//---it---fine
	}
	
	public function index()
	{
		redirect('setup/language');
	}
	
	public function language()
	{
		if ($this->input->post('btn_continue'))
		{
			$this->session->set_userdata('fi_lang', $this->input->post('fi_lang'));
			$this->session->set_userdata('install_step', 'prerequisites');
			redirect('setup/prerequisites');
		}
		
		$this->session->unset_userdata('install_step');
		$this->session->unset_userdata('is_upgrade');
		
		$this->load->helper('directory');
		
		$languages = directory_map(APPPATH . '/language', TRUE);
		
		sort($languages);

        $this->layout->set('languages', $languages);

		$this->layout->buffer('content', 'setup/language');
		$this->layout->render('base');
	}

	public function prerequisites()
	{
		if ($this->session->userdata('install_step') <> 'prerequisites')
		{
			redirect('setup/language');
		}
		
		if ($this->input->post('btn_continue'))
		{
			$this->session->set_userdata('install_step', 'configure_database');
			redirect('setup/configure_database');
		}

		$this->layout->set(
			array(
                'basics'    => $this->check_basics(),
				'writables'	 => $this->check_writables(),
				'errors'	 => $this->errors
			)
		);

		$this->layout->buffer('content', 'setup/prerequisites');
		$this->layout->render('base');
	}

	public function configure_database()
	{
		if ($this->session->userdata('install_step') <> 'configure_database')
		{
			redirect('setup/prerequisites');
		}

		if ($this->input->post('btn_continue'))
		{
			$this->load_ci_database();

			// This might be an upgrade - check if it is
			if (!$this->db->table_exists('fi_versions'))
			{
				// This appears to be an install
				$this->session->set_userdata('install_step', 'install_tables');
				redirect('setup/install_tables');
			}
			else
			{
				// This appears to be an upgrade
				$this->session->set_userdata('is_upgrade', TRUE);
				$this->session->set_userdata('install_step', 'upgrade_tables');
				redirect('setup/upgrade_tables');
			}
		}

		if ($this->input->post('db_hostname'))
		{
			$this->write_database_config($this->input->post('db_hostname'), $this->input->post('db_username'), $this->input->post('db_password'), $this->input->post('db_database'));
		}

		$this->layout->set('database', $this->check_database());
		$this->layout->set('errors', $this->errors);
		$this->layout->buffer('content', 'setup/configure_database');
		$this->layout->render('base');
	}

	public function install_tables()
	{
		if ($this->session->userdata('install_step') <> 'install_tables')
		{
			redirect('setup/prerequisites');
		}

		if ($this->input->post('btn_continue'))
		{
			$this->session->set_userdata('install_step', 'upgrade_tables');
			redirect('setup/upgrade_tables');
		}

		$this->load_ci_database();

		$this->layout->set(
			array(
				'success'	 => $this->mdl_setup->install_tables(),
				'errors'	 => $this->mdl_setup->errors
			)
		);

		$this->layout->buffer('content', 'setup/install_tables');
		$this->layout->render('base');
	}

	public function upgrade_tables()
	{
		if ($this->session->userdata('install_step') <> 'upgrade_tables')
		{
			redirect('setup/prerequisites');
		}

		if ($this->input->post('btn_continue'))
		{
			if (!$this->session->userdata('is_upgrade'))
			{
				$this->session->set_userdata('install_step', 'create_user');
				redirect('setup/create_user');
			}
			else
			{
				$this->session->set_userdata('install_step', 'complete');
				redirect('setup/complete');
			}
		}

		$this->load_ci_database();

		$this->layout->set(
			array(
				'success'	 => $this->mdl_setup->upgrade_tables(),
				'errors'	 => $this->mdl_setup->errors
			)
		);

		$this->layout->buffer('content', 'setup/upgrade_tables');
		$this->layout->render('base');
	}

	public function create_user()
	{
		if ($this->session->userdata('install_step') <> 'create_user')
		{
			redirect('setup/prerequisites');
		}

		$this->load_ci_database();

		$this->load->model('users/mdl_users');

		if ($this->mdl_users->run_validation())
		{
			$db_array				 = $this->mdl_users->db_array();
			$db_array['user_type']	 = 1;

			$this->mdl_users->save(NULL, $db_array);

			$this->session->set_userdata('install_step', 'complete');
			redirect('setup/complete');
		}

		$this->layout->buffer('content', 'setup/create_user');
		$this->layout->render('base');
	}

	public function complete()
	{
		if ($this->session->userdata('install_step') <> 'complete')
		{
			redirect('setup/prerequisites');
		}

		$this->layout->buffer('content', 'setup/complete');
		$this->layout->render('base');
	}

	private function check_writables()
	{
		$checks = array();

		$writables = array(
			'./uploads',
			'./uploads/temp',
            './' . APPPATH . 'config/database.php',
            './' . APPPATH . 'helpers/mpdf/tmp'
		);

		foreach ($writables as $writable)
		{
			if (!is_writable($writable))
			{
				$checks[] = array(
					'message'	 => $writable . ' ' . lang('is_not_writable'),
					'success'	 => 0
				);

				$this->errors += 1;
			}
			else
			{
				$checks[] = array(
					'message'	 => $writable . ' ' . lang('is_writable'),
					'success'	 => 1
				);
			}
		}

		return $checks;
	}

	private function check_database()
	{
		$this->load->library('lib_mysql');

		require(APPPATH . '/config/database.php');

		$db = $db['default'];

		$can_connect = $this->lib_mysql->connect($db['hostname'], $db['username'], $db['password']);

		if (!$can_connect)
		{
			$this->errors += 1;

			return array(
				'message'	 => lang('cannot_connect_database_server'),
				'success'	 => 0
			);
		}

		$can_select_db = $this->lib_mysql->select_db($db['database']);

		if (!$can_select_db)
		{
			$this->errors += 1;

			return array(
				'message'	 => lang('cannot_select_specified_database'),
				'success'	 => 0
			);
		}

		return array(
			'message'	 => lang('database_properly_configured'),
			'success'	 => 1
		);
	}

    private function check_basics()
    {
        $checks = array();

        $php_required = '5.3';
        $php_installed = PHP_MAJOR_VERSION . '.' . PHP_MINOR_VERSION;
        
        if ($php_installed < $php_required)
        {
            $this->errors += 1;

            $checks[] = array(
                'message' => sprintf(lang('php_version_fail'), $php_installed, $php_required),
                'success' => 0
            );
        }
        else
        {
            $checks[] = array(
                'message' => lang('php_version_success'),
                'success' => 1
            );
        }

        return $checks;
    }

	private function write_database_config($hostname, $username, $password, $database)
	{
		$db_file = read_file(APPPATH . 'config/database_empty.php');

		$db_file = str_replace('$db[\'default\'][\'hostname\'] = \'\'', '$db[\'default\'][\'hostname\'] = \'' . $hostname . '\'', $db_file);
		$db_file = str_replace('$db[\'default\'][\'username\'] = \'\'', '$db[\'default\'][\'username\'] = \'' . $username . '\'', $db_file);
		$db_file = str_replace('$db[\'default\'][\'password\'] = \'\'', '$db[\'default\'][\'password\'] = \'' . $password . '\'', $db_file);
		$db_file = str_replace('$db[\'default\'][\'database\'] = \'\'', '$db[\'default\'][\'database\'] = \'' . $database . '\'', $db_file);

		write_file(APPPATH . 'config/database.php', $db_file);
	}

	private function load_ci_database()
	{
		$this->load->database();
        // $this->db->db_debug = 0;
	}

}

?>