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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\event;
/**
* Crawls through a markdown file and grabs all events
*/
class md_exporter
{
    /** @var string Path where we look for files*/
    protected $path;
    /** @var string phpBB Root Path */
    protected $root_path;
    /** @var string The minimum version for the events to return */
    protected $min_version;
    /** @var string The maximum version for the events to return */
    protected $max_version;
    /** @var string */
    protected $filter;
    /** @var string */
    protected $current_event;
    /** @var array */
    protected $events;
    /**
    * @param string $phpbb_root_path
    * @param mixed $extension    String 'vendor/ext' to filter, null for phpBB core
    * @param string $min_version
    * @param string $max_version
    */
    public function __construct($phpbb_root_path, $extension = null, $min_version = null, $max_version = null)
    {
        $this->root_path = $phpbb_root_path;
        $this->path = $this->root_path;
        if ($extension)
        {
            $this->path .= 'ext/' . $extension . '/';
        }
        $this->events = array();
        $this->events_by_file = array();
        $this->filter = $this->current_event = '';
        $this->min_version = $min_version;
        $this->max_version = $max_version;
    }
    /**
    * Get the list of all events
    *
    * @return array        Array with events: name => details
    */
    public function get_events()
    {
        return $this->events;
    }
    /**
    * @param string $md_file    Relative from phpBB root
    * @return int        Number of events found
    * @throws \LogicException
    */
    public function crawl_phpbb_directory_adm($md_file)
    {
        $this->crawl_eventsmd($md_file, 'adm');
        $file_list = $this->get_recursive_file_list($this->path  . 'adm/style/');
        foreach ($file_list as $file)
        {
            $file_name = 'adm/style/' . $file;
            $this->validate_events_from_file($file_name, $this->crawl_file_for_events($file_name));
        }
        return count($this->events);
    }
    /**
    * @param string $md_file    Relative from phpBB root
    * @return int        Number of events found
    * @throws \LogicException
    */
    public function crawl_phpbb_directory_styles($md_file)
    {
        $this->crawl_eventsmd($md_file, 'styles');
        $styles = array('prosilver');
        foreach ($styles as $style)
        {
            $file_list = $this->get_recursive_file_list(
                $this->path . 'styles/' . $style . '/template/'
            );
            foreach ($file_list as $file)
            {
                $file_name = 'styles/' . $style . '/template/' . $file;
                $this->validate_events_from_file($file_name, $this->crawl_file_for_events($file_name));
            }
        }
        return count($this->events);
    }
    /**
    * @param string $md_file    Relative from phpBB root
    * @param string $filter        Should be 'styles' or 'adm'
    * @return int        Number of events found
    * @throws \LogicException
    */
    public function crawl_eventsmd($md_file, $filter)
    {
        if (!file_exists($this->path . $md_file))
        {
            throw new \LogicException("The event docs file '{$md_file}' could not be found");
        }
        $file_content = file_get_contents($this->path . $md_file);
        $this->filter = $filter;
        $events = explode("\n\n", $file_content);
        foreach ($events as $event)
        {
            // Last row of the file
            if (strpos($event, "\n===\n") === false)
            {
                continue;
            }
            list($event_name, $details) = explode("\n===\n", $event, 2);
            $this->validate_event_name($event_name);
            $sorted_events = [$this->current_event, $event_name];
            natsort($sorted_events);
            $this->current_event = $event_name;
            if (isset($this->events[$this->current_event]))
            {
                throw new \LogicException("The event '{$this->current_event}' is defined multiple times");
            }
            // Use array_values() to get actual first element and check against natural order
            if (array_values($sorted_events)[0] === $event_name)
            {
                throw new \LogicException("The event '{$sorted_events[1]}' should be defined before '{$sorted_events[0]}'");
            }
            if (($this->filter == 'adm' && strpos($this->current_event, 'acp_') !== 0)
                || ($this->filter == 'styles' && strpos($this->current_event, 'acp_') === 0))
            {
                continue;
            }
            list($file_details, $details) = explode("\n* Since: ", $details, 2);
            $changed_versions = array();
            if (strpos($details, "\n* Changed: ") !== false)
            {
                list($since, $details) = explode("\n* Changed: ", $details, 2);
                while (strpos($details, "\n* Changed: ") !== false)
                {
                    list($changed, $details) = explode("\n* Changed: ", $details, 2);
                    $changed_versions[] = $changed;
                }
                list($changed, $description) = explode("\n* Purpose: ", $details, 2);
                $changed_versions[] = $changed;
            }
            else
            {
                list($since, $description) = explode("\n* Purpose: ", $details, 2);
                $changed_versions = array();
            }
            $files = $this->validate_file_list($file_details);
            $since = $this->validate_since($since);
            $changes = array();
            foreach ($changed_versions as $changed)
            {
                list($changed_version, $changed_description) = $this->validate_changed($changed);
                if (isset($changes[$changed_version]))
                {
                    throw new \LogicException("Duplicate change information found for event '{$this->current_event}'");
                }
                $changes[$changed_version] = $changed_description;
            }
            $description = trim($description, "\n") . "\n";
            if (!$this->version_is_filtered($since))
            {
                $is_filtered = false;
                foreach ($changes as $version => $null)
                {
                    if ($this->version_is_filtered($version))
                    {
                        $is_filtered = true;
                        break;
                    }
                }
                if (!$is_filtered)
                {
                    continue;
                }
            }
            $this->events[$event_name] = array(
                'event'            => $this->current_event,
                'files'            => $files,
                'since'            => $since,
                'changed'        => $changes,
                'description'    => $description,
            );
        }
        return count($this->events);
    }
    /**
     * The version to check
     *
     * @param string $version
     * @return bool
     */
    protected function version_is_filtered($version)
    {
        return (!$this->min_version || phpbb_version_compare($this->min_version, $version, '<='))
        && (!$this->max_version || phpbb_version_compare($this->max_version, $version, '>='));
    }
    /**
    * Format the php events as a wiki table
    *
    * @param string $action
    * @return string        Number of events found
    */
    public function export_events_for_wiki($action = '')
    {
        if ($this->filter === 'adm')
        {
            if ($action === 'diff')
            {
                $wiki_page = '=== ACP Template Events ===' . "\n";
            }
            else
            {
                $wiki_page = '= ACP Template Events =' . "\n";
            }
            $wiki_page .= '{| class="zebra sortable" cellspacing="0" cellpadding="5"' . "\n";
            $wiki_page .= '! Identifier !! Placement !! Added in Release !! Explanation' . "\n";
        }
        else
        {
            if ($action === 'diff')
            {
                $wiki_page = '=== Template Events ===' . "\n";
            }
            else
            {
                $wiki_page = '= Template Events =' . "\n";
            }
            $wiki_page .= '{| class="zebra sortable" cellspacing="0" cellpadding="5"' . "\n";
            $wiki_page .= '! Identifier !! Prosilver Placement (If applicable) !! Added in Release !! Explanation' . "\n";
        }
        foreach ($this->events as $event_name => $event)
        {
            $wiki_page .= "|- id=\"{$event_name}\"\n";
            $wiki_page .= "| [[#{$event_name}|{$event_name}]] || ";
            if ($this->filter === 'adm')
            {
                $wiki_page .= implode(', ', $event['files']['adm']);
            }
            else
            {
                $wiki_page .= implode(', ', $event['files']['prosilver']);
            }
            $wiki_page .= " || {$event['since']} || " . str_replace("\n", ' ', $event['description']) . "\n";
        }
        $wiki_page .= '|}' . "\n";
        return $wiki_page;
    }
    /**
    * Validates a template event name
    *
    * @param $event_name
    * @return null
    * @throws \LogicException
    */
    public function validate_event_name($event_name)
    {
        if (!preg_match('#^([a-z][a-z0-9]*(?:_[a-z][a-z0-9]*)+)$#', $event_name))
        {
            throw new \LogicException("Invalid event name '{$event_name}'");
        }
    }
    /**
    * Validate "Since" Information
    *
    * @param string $since
    * @return string
    * @throws \LogicException
    */
    public function validate_since($since)
    {
        if (!$this->validate_version($since))
        {
            throw new \LogicException("Invalid since information found for event '{$this->current_event}'");
        }
        return $since;
    }
    /**
    * Validate "Changed" Information
    *
    * @param string $changed
    * @return string
    * @throws \LogicException
    */
    public function validate_changed($changed)
    {
        if (strpos($changed, ' ') !== false)
        {
            list($version, $description) = explode(' ', $changed, 2);
        }
        else
        {
            $version = $changed;
            $description = '';
        }
        if (!$this->validate_version($version))
        {
            throw new \LogicException("Invalid changed information found for event '{$this->current_event}'");
        }
        return array($version, $description);
    }
    /**
    * Validate "version" Information
    *
    * @param string $version
    * @return bool True if valid, false otherwise
    */
    public function validate_version($version)
    {
        return preg_match('#^\d+\.\d+\.\d+(?:-(?:a|b|RC|pl)\d+)?$#', $version);
    }
    /**
    * Validate the files list
    *
    * @param string $file_details
    * @return array
    * @throws \LogicException
    */
    public function validate_file_list($file_details)
    {
        $files_list = array(
            'prosilver'        => array(),
            'adm'            => array(),
        );
        // Multi file list
        if (strpos($file_details, "* Locations:\n    + ") === 0)
        {
            $file_details = substr($file_details, strlen("* Locations:\n    + "));
            $files = explode("\n    + ", $file_details);
            foreach ($files as $file)
            {
                if (!preg_match('#^([^ ]+)( \([0-9]+\))?$#', $file))
                {
                    throw new \LogicException("Invalid event instances for file '{$file}' found for event '{$this->current_event}'", 1);
                }
                list($file) = explode(" ", $file);
                if (!file_exists($this->path . $file) || substr($file, -5) !== '.html')
                {
                    throw new \LogicException("Invalid file '{$file}' not found for event '{$this->current_event}'", 2);
                }
                if (($this->filter !== 'adm') && strpos($file, 'styles/prosilver/template/') === 0)
                {
                    $files_list['prosilver'][] = substr($file, strlen('styles/prosilver/template/'));
                }
                else if (($this->filter === 'adm') && strpos($file, 'adm/style/') === 0)
                {
                    $files_list['adm'][] = substr($file, strlen('adm/style/'));
                }
                else
                {
                    throw new \LogicException("Invalid file '{$file}' not found for event '{$this->current_event}'", 3);
                }
                $this->events_by_file[$file][] = $this->current_event;
            }
        }
        else if ($this->filter == 'adm')
        {
            $file = substr($file_details, strlen('* Location: '));
            if (!file_exists($this->path . $file) || substr($file, -5) !== '.html')
            {
                throw new \LogicException("Invalid file '{$file}' not found for event '{$this->current_event}'", 1);
            }
            $files_list['adm'][] =  substr($file, strlen('adm/style/'));
            $this->events_by_file[$file][] = $this->current_event;
        }
        else
        {
            throw new \LogicException("Invalid file list found for event '{$this->current_event}'", 1);
        }
        return $files_list;
    }
    /**
    * Get all template events in a template file
    *
    * @param string $file
    * @return array
    * @throws \LogicException
    */
    public function crawl_file_for_events($file)
    {
        if (!file_exists($this->path . $file))
        {
            throw new \LogicException("File '{$file}' does not exist", 1);
        }
        $event_list = array();
        $file_content = file_get_contents($this->path . $file);
        preg_match_all('/(?:{%|<!--) EVENT (.*) (?:%}|-->)/U', $file_content, $event_list);
        return $event_list[1];
    }
    /**
    * Validates whether all events from $file are in the md file and vice-versa
    *
    * @param string $file
    * @param array $events
    * @return true
    * @throws \LogicException
    */
    public function validate_events_from_file($file, array $events)
    {
        if (empty($this->events_by_file[$file]) && empty($events))
        {
            return true;
        }
        else if (empty($this->events_by_file[$file]))
        {
            $event_list = implode("', '", $events);
            throw new \LogicException("File '{$file}' should not contain events, but contains: "
                . "'{$event_list}'", 1);
        }
        else if (empty($events))
        {
            $event_list = implode("', '", $this->events_by_file[$file]);
            throw new \LogicException("File '{$file}' contains no events, but should contain: "
                . "'{$event_list}'", 1);
        }
        $missing_events_from_file = array();
        foreach ($this->events_by_file[$file] as $event)
        {
            if (!in_array($event, $events))
            {
                $missing_events_from_file[] = $event;
            }
        }
        if (!empty($missing_events_from_file))
        {
            $event_list = implode("', '", $missing_events_from_file);
            throw new \LogicException("File '{$file}' does not contain events: '{$event_list}'", 2);
        }
        $missing_events_from_md = array();
        foreach ($events as $event)
        {
            if (!in_array($event, $this->events_by_file[$file]))
            {
                $missing_events_from_md[] = $event;
            }
        }
        if (!empty($missing_events_from_md))
        {
            $event_list = implode("', '", $missing_events_from_md);
            throw new \LogicException("File '{$file}' contains additional events: '{$event_list}'", 3);
        }
        return true;
    }
    /**
    * Returns a list of files in $dir
    *
    * Works recursive with any depth
    *
    * @param    string    $dir    Directory to go through
    * @return    array    List of files (including directories)
    */
    public function get_recursive_file_list($dir)
    {
        try
        {
            $iterator = new \RecursiveIteratorIterator(
                new \phpbb\recursive_dot_prefix_filter_iterator(
                    new \RecursiveDirectoryIterator(
                        $dir,
                        \FilesystemIterator::SKIP_DOTS
                    )
                ),
                \RecursiveIteratorIterator::SELF_FIRST
            );
        }
        catch (\Exception $e)
        {
            return array();
        }
        $files = array();
        foreach ($iterator as $file_info)
        {
            /** @var \RecursiveDirectoryIterator $file_info */
            if ($file_info->isDir())
            {
                continue;
            }
            $relative_path = $iterator->getInnerIterator()->getSubPathname();
            if (substr($relative_path, -5) == '.html')
            {
                $files[] = str_replace(DIRECTORY_SEPARATOR, '/', $relative_path);
            }
        }
        return $files;
    }
}