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<?php
/**
 *
 * This file is part of the phpBB Forum Software package.
 *
 * @copyright (c) phpBB Limited <https://www.phpbb.com>
 * @license GNU General Public License, version 2 (GPL-2.0)
 *
 * For full copyright and license information, please see
 * the docs/CREDITS.txt file.
 *
 */
namespace phpbb\install\module\update_filesystem\task;
use phpbb\install\exception\resource_limit_reached_exception;
use phpbb\install\exception\user_interaction_required_exception;
use phpbb\install\helper\config;
use phpbb\install\helper\container_factory;
use phpbb\install\helper\iohandler\iohandler_interface;
use phpbb\install\helper\update_helper;
use phpbb\install\task_base;
/**
 * Merges user made changes into the files
 */
class diff_files extends task_base
{
    /**
     * @var \phpbb\cache\driver\driver_interface
     */
    protected $cache;
    /**
     * @var config
     */
    protected $installer_config;
    /**
     * @var iohandler_interface
     */
    protected $iohandler;
    /**
     * @var string
     */
    protected $phpbb_root_path;
    /**
     * @var string
     */
    protected $php_ext;
    /**
     * @var update_helper
     */
    protected $update_helper;
    /**
     * Constructor
     *
     * @param container_factory        $container
     * @param config                $config
     * @param iohandler_interface    $iohandler
     * @param update_helper            $update_helper
     * @param string                $phpbb_root_path
     * @param string                $php_ext
     */
    public function __construct(container_factory $container, config $config, iohandler_interface $iohandler, update_helper $update_helper, $phpbb_root_path, $php_ext)
    {
        $this->installer_config    = $config;
        $this->iohandler        = $iohandler;
        $this->update_helper    = $update_helper;
        $this->phpbb_root_path    = $phpbb_root_path;
        $this->php_ext            = $php_ext;
        $this->cache            = $container->get('cache.driver');
        parent::__construct(false);
    }
    /**
     * {@inheritdoc}
     */
    public function check_requirements()
    {
        $files_to_diff = $this->installer_config->get('update_files', array());
        $files_to_diff = (isset($files_to_diff['update_with_diff'])) ? $files_to_diff['update_with_diff'] : array();
        return $this->installer_config->get('do_update_files', false) && count($files_to_diff) > 0;
    }
    /**
     * {@inheritdoc}
     */
    public function run()
    {
        // Include diff engine
        $this->update_helper->include_file('includes/diff/diff.' . $this->php_ext);
        $this->update_helper->include_file('includes/diff/engine.' . $this->php_ext);
        // Set up basic vars
        $old_path = $this->update_helper->get_path_to_old_update_files();
        $new_path = $this->update_helper->get_path_to_new_update_files();
        $update_files = $this->installer_config->get('update_files', array());
        $files_to_diff = $update_files['update_with_diff'];
        // Set progress bar
        $this->iohandler->set_task_count(count($files_to_diff), true);
        $this->iohandler->set_progress('UPDATE_FILE_DIFF', 0);
        $progress_count = $this->installer_config->get('file_diff_update_count', 0);
        // Recover progress
        $progress_key = $this->installer_config->get('differ_progress_key', -1);
        $progress_recovered = ($progress_key === -1);
        $merge_conflicts = $this->installer_config->get('merge_conflict_list', array());
        foreach ($files_to_diff as $key => $filename)
        {
            if ($progress_recovered === false)
            {
                if ($progress_key === $key)
                {
                    $progress_recovered = true;
                }
                continue;
            }
            // Read in files' content
            $file_contents = array();
            // Handle the special case when user created a file with the filename that is now new in the core
            if (file_exists($old_path . $filename))
            {
                $file_contents[0] = file_get_contents($old_path . $filename);
                $filenames = array(
                    $this->phpbb_root_path . $filename,
                    $new_path . $filename
                );
                foreach ($filenames as $file_to_diff)
                {
                    $file_contents[] = file_get_contents($file_to_diff);
                    if ($file_contents[count($file_contents) - 1] === false)
                    {
                        $this->iohandler->add_error_message(array('FILE_DIFFER_ERROR_FILE_CANNOT_BE_READ', $files_to_diff));
                        unset($file_contents);
                        throw new user_interaction_required_exception();
                    }
                }
                $diff = new \diff3($file_contents[0], $file_contents[1], $file_contents[2]);
                // Handle conflicts
                if ($diff->get_num_conflicts() !== 0)
                {
                    $merge_conflicts[] = $filename;
                }
                if ($diff->merged_output() !== $file_contents[1])
                {
                    // Save merged output
                    $this->cache->put(
                        '_file_' . md5($filename),
                        base64_encode(implode("\n", $diff->merged_output()))
                    );
                }
                else
                {
                    unset($update_files['update_with_diff'][$key]);
                }
                unset($file_contents);
                unset($diff);
            }
            else
            {
                $new_file_content = file_get_contents($new_path . $filename);
                if ($new_file_content === false)
                {
                    $this->iohandler->add_error_message(array('FILE_DIFFER_ERROR_FILE_CANNOT_BE_READ', $files_to_diff));
                    unset($new_file_content );
                    throw new user_interaction_required_exception();
                }
                // Save new file content to cache
                $this->cache->put(
                    '_file_' . md5($filename),
                    base64_encode($new_file_content)
                );
                unset($new_file_content);
            }
            $progress_count++;
            $this->iohandler->set_progress('UPDATE_FILE_DIFF', $progress_count);
            if ($this->installer_config->get_time_remaining() <= 0 || $this->installer_config->get_memory_remaining() <= 0)
            {
                // Save differ progress
                $this->installer_config->set('differ_progress_key', $key);
                $this->installer_config->set('merge_conflict_list', $merge_conflicts);
                $this->installer_config->set('file_diff_update_count', $progress_count);
                foreach ($update_files as $type => $files)
                {
                    if (empty($files))
                    {
                        unset($update_files[$type]);
                    }
                }
                $this->installer_config->set('update_files', $update_files);
                // Request refresh
                throw new resource_limit_reached_exception();
            }
        }
        $this->iohandler->finish_progress('ALL_FILES_DIFFED');
        $this->installer_config->set('merge_conflict_list', $merge_conflicts);
        foreach ($update_files as $type => $files)
        {
            if (empty($files))
            {
                unset($update_files[$type]);
            }
        }
        $this->installer_config->set('update_files', $update_files);
    }
    /**
     * {@inheritdoc}
     */
    static public function get_step_count()
    {
        return 0;
    }
    /**
     * {@inheritdoc}
     */
    public function get_task_lang_name()
    {
        return '';
    }
}