<?php

/**
 * Copyright (c) 2010-2024 Combodo SAS
 *
 * This file is part of iTop.
 *
 * iTop is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * iTop 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with iTop. If not, see <http://www.gnu.org/licenses/>
 *
 */

use Combodo\iTop\PhpParser\Evaluation\PhpExpressionEvaluator;
use Combodo\iTop\Setup\ModuleDependency\Module;
use Combodo\iTop\Setup\ModuleDiscovery\ModuleFileReader;
use Combodo\iTop\Setup\ModuleDiscovery\ModuleFileReaderException;

require_once(APPROOT.'setup/modulediscovery/ModuleFileReader.php');
require_once(__DIR__.'/moduledependency/moduledependencysort.class.inc.php');

use Combodo\iTop\Setup\ModuleDependency\ModuleDependencySort;

class MissingDependencyException extends CoreException
{
	/**
	 * @see \ModuleDiscovery::OrderModulesByDependencies property init
	 * @var array<string, array<string>>
	 *     module id as key
	 *     another array as value, containing : 'module' with module info, 'dependencies' with missing dependencies
	 */
	public $aModulesInfo;

	/**
	 * @return string HTML to print to the user the modules impacted
	 * @since 2.7.7 3.0.2 3.1.0 N°5090 PR #280
	 */
	public function getHtmlDesc($sHighlightHtmlBegin = null, $sHighlightHtmlEnd = null)
	{
		$sErrorMessage = <<<HTML
<p>The following modules have unmet dependencies:</p>
<ul>
HTML;
		foreach ($this->aModulesInfo as $sModuleId => $aModuleErrors) {
			$sModuleLabel = utils::EscapeHtml($aModuleErrors['module']['label']);
			$sModuleId = utils::EscapeHtml($sModuleId);
			$aModuleMissingDependencies = $aModuleErrors['dependencies'];
			$sErrorMessage .= <<<HTML
	<li><strong>$sModuleLabel</strong> ($sModuleId):
		<ul>
HTML;

			foreach ($aModuleMissingDependencies as $sMissingModule) {
				$sMissingModule = utils::EscapeHtml($sMissingModule);
				$sErrorMessage .= "<li>$sMissingModule</li>";
			}
			$sErrorMessage .= <<<HTML
		</ul>
	</li>
HTML;

		}
		$sErrorMessage .= '</ul>';

		return $sErrorMessage;
	}
}

class ModuleDiscovery
{
	public static $m_aModuleArgs = [
		'label' => 'One line description shown during the interactive setup',
		'dependencies' => 'array of module ids',
		'mandatory' => 'boolean',
		'visible' => 'boolean',
		'datamodel' =>  'array of data model files',
		//'dictionary' => 'array of dictionary files', // No longer mandatory, now automated
		'data.struct' => 'array of structural data files',
		'data.sample' => 'array of sample data files',
		'doc.manual_setup' => 'url',
		'doc.more_information' => 'url',
	];

	// Cache the results and the source directories
	protected static $m_aSearchDirs = null;
	protected static $m_aModules = [];
	protected static $m_aModuleVersionByName = [];

	// All the entries below are list of file paths relative to the module directory
	protected static $m_aFilesList = ['datamodel', 'webservice', 'dictionary', 'data.struct', 'data.sample'];

	// ModulePath is used by AddModule to get the path of the module being included (in ListModuleFiles)
	protected static $m_sModulePath = null;

	private static PhpExpressionEvaluator $oPhpExpressionEvaluator;

	protected static function SetModulePath($sModulePath)
	{
		self::$m_sModulePath = $sModulePath;
	}

	/**
	 * @param string $sFilePath
	 * @param string $sId
	 * @param array $aArgs
	 *
	 * @throws \Exception for missing parameter
	 */
	public static function AddModule($sFilePath, $sId, $aArgs)
	{
		if (is_null($aArgs) || ! is_array($aArgs)) {
			throw new ModuleFileReaderException("Error parsing module file args", 0, null, $sFilePath);
		}
		if (!array_key_exists('itop_version', $aArgs)) {
			// Assume 1.0.2
			$aArgs['itop_version'] = '1.0.2';
		}
		foreach (array_keys(self::$m_aModuleArgs) as $sArgName) {
			if (!array_key_exists($sArgName, $aArgs)) {
				throw new Exception("Module '$sId': missing argument '$sArgName'");
			}
		}

		$aArgs['root_dir'] = dirname($sFilePath);
		$aArgs['module_file'] = $sFilePath;

		list($sModuleName, $sModuleVersion) = static::GetModuleName($sId);

		if (array_key_exists($sModuleName, self::$m_aModuleVersionByName)) {
			if (version_compare($sModuleVersion, self::$m_aModuleVersionByName[$sModuleName]['version'], '>')) {
				// Newer version, let's upgrade
				$sIdToRemove = self::$m_aModuleVersionByName[$sModuleName]['id'];
				unset(self::$m_aModules[$sIdToRemove]);

				self::$m_aModuleVersionByName[$sModuleName]['version'] = $sModuleVersion;
				self::$m_aModuleVersionByName[$sModuleName]['id'] = $sId;
			} else {
				// Older (or equal) version, let's ignore it
				return;
			}
		} else {
			// First version to be loaded for this module, remember it
			self::$m_aModuleVersionByName[$sModuleName]['version'] = $sModuleVersion;
			self::$m_aModuleVersionByName[$sModuleName]['id'] = $sId;
		}

		self::$m_aModules[$sId] = $aArgs;

		// Now keep the relative paths, as provided
		/*
		foreach(self::$m_aFilesList as $sAttribute)
		{
			if (isset(self::$m_aModules[$sId][$sAttribute]))
			{
				// All the items below are list of files, that are relative to the current file
				// being loaded, let's update their path to store path relative to the application directory
				foreach(self::$m_aModules[$sId][$sAttribute] as $idx => $sRelativePath)
				{
					self::$m_aModules[$sId][$sAttribute][$idx] = self::$m_sModulePath.'/'.$sRelativePath;
				}
			}
		}
		*/
		// Populate automatically the list of dictionary files
		$aMatches = [];
		if (preg_match('|^([^/]+)|', $sId, $aMatches)) { // ModuleName = everything before the first forward slash
			$sModuleName = $aMatches[1];
			$sDir = dirname($sFilePath);
			$aDirs = [
				$sDir => self::$m_sModulePath,
				$sDir.'/dictionaries' => self::$m_sModulePath.'/dictionaries',
			];
			foreach ($aDirs as $sRootDir => $sPath) {
				if ($hDir = @opendir($sRootDir)) {
					while (($sFile = readdir($hDir)) !== false) {
						$aMatches = [];
						if (preg_match("/^[^\\.]+.dict.$sModuleName.php$/i", $sFile, $aMatches)) { // Dictionary files named like <Lang>.dict.<ModuleName>.php are loaded automatically
							self::$m_aModules[$sId]['dictionary'][] = $sPath.'/'.$sFile;
						}
					}
					closedir($hDir);
				}
			}
		}
	}

	/**
	 * Get the list of "discovered" modules, ordered based on their (inter) dependencies
	 *
	 * @param bool $bAbortOnMissingDependency ...
	 * @param array $aModulesToLoad List of modules to search for, defaults to all if omitted
	 *
	 * @return array
	 * @throws \MissingDependencyException
	 */
	protected static function GetModules($bAbortOnMissingDependency = false, $aModulesToLoad = null)
	{
		// Order the modules to take into account their inter-dependencies
		return self::OrderModulesByDependencies(self::$m_aModules, $bAbortOnMissingDependency, $aModulesToLoad);
	}

	/**
	 * Arrange an list of modules, based on their (inter) dependencies
	 * @param array $aModules The list of modules to process: 'id' => $aModuleInfo
	 * @param bool $bAbortOnMissingDependency ...
	 * @param array $aModulesToLoad List of modules to search for, defaults to all if omitted
	 * @return array
	 * @throws \MissingDependencyException
	*/
	public static function OrderModulesByDependencies($aModules, $bAbortOnMissingDependency = false, $aModulesToLoad = null)
	{
		if (is_null($aModulesToLoad)) {
			$aFilteredModules = $aModules;
		} else {
			$aFilteredModules = [];
			foreach ($aModules as $sModuleId => $aModule) {
				$oModule = new Module($sModuleId);
				$sModuleName = $oModule->GetModuleName();
				if (in_array($sModuleName, $aModulesToLoad)) {
					$aFilteredModules[$sModuleId] = $aModule;
				}
			}
		}

		return ModuleDependencySort::GetInstance()->GetModulesOrderedForInstallation($aFilteredModules, $bAbortOnMissingDependency);
	}

	private static function GetPhpExpressionEvaluator(): PhpExpressionEvaluator
	{
		if (!isset(static::$oPhpExpressionEvaluator)) {
			static::$oPhpExpressionEvaluator = new PhpExpressionEvaluator([], RunTimeEnvironment::STATIC_CALL_AUTOSELECT_WHITELIST);
		}

		return static::$oPhpExpressionEvaluator;
	}

	/**
	 * Search (on the disk) for all defined iTop modules, load them and returns the list (as an array)
	 * of the possible iTop modules to install
	 *
	 * @param $aSearchDirs array of directories to search (absolute paths)
	 * @param bool $bAbortOnMissingDependency ...
	 * @param array $aModulesToLoad List of modules to search for, defaults to all if omitted
	 *
	 * @return array A big array moduleID => ModuleData
	 * @throws \Exception
	 */
	public static function GetAvailableModules($aSearchDirs, $bAbortOnMissingDependency = false, $aModulesToLoad = null)
	{
		if (self::$m_aSearchDirs != $aSearchDirs) {
			self::ResetCache();
		}

		if (is_null(self::$m_aSearchDirs)) {
			self::$m_aSearchDirs = $aSearchDirs;

			// Not in cache, let's scan the disk
			foreach ($aSearchDirs as $sSearchDir) {
				$sLookupDir = realpath($sSearchDir);
				if ($sLookupDir == '') {
					throw new Exception("Invalid directory '$sSearchDir'");
				}

				clearstatcache();
				self::ListModuleFiles(basename($sSearchDir), dirname($sSearchDir));
			}
			return self::GetModules($bAbortOnMissingDependency, $aModulesToLoad);
		} else {
			// Reuse the previous results
			return self::GetModules($bAbortOnMissingDependency, $aModulesToLoad);
		}
	}

	public static function ResetCache()
	{
		self::$m_aSearchDirs = null;
		self::$m_aModules = [];
		self::$m_aModuleVersionByName = [];
	}

	/**
	 * Helper function to interpret the name of a module
	 * @param $sModuleId string Identifier of the module, in the form 'name/version'
	 * @return array(name, version)
	 */
	public static function GetModuleName($sModuleId)
	{
		$aMatches = [];
		if (preg_match('!^(.*)/(.*)$!', $sModuleId, $aMatches)) {
			$sName = $aMatches[1];
			$sVersion = $aMatches[2];
			if ($sVersion === "") {
				$sVersion = "1.0.0";
			}
		} else {
			$sName = $sModuleId;
			$sVersion = "1.0.0";
		}

		return [$sName, $sVersion];
	}

	/**
	 * Helper function to browse a directory and get the modules
	 *
	 * @param $sRelDir string Directory to start from
	 * @param $sRootDir string The root directory path
	 *
	 * @throws \Exception
	 */
	protected static function ListModuleFiles($sRelDir, $sRootDir)
	{
		static $iDummyClassIndex = 0;
		$sDirectory = $sRootDir.'/'.$sRelDir;

		if ($hDir = opendir($sDirectory)) {
			// This is the correct way to loop over the directory. (according to the documentation)
			while (($sFile = readdir($hDir)) !== false) {
				$aMatches = [];
				if (is_dir($sDirectory.'/'.$sFile)) {
					if (($sFile != '.') && ($sFile != '..') && ($sFile != '.svn') && ($sFile != 'vendor')) {
						self::ListModuleFiles($sRelDir.'/'.$sFile, $sRootDir);
					}
				} elseif (preg_match('/^module\.(.*).php$/i', $sFile, $aMatches)) {
					self::SetModulePath($sRelDir);
					$sModuleFilePath = $sDirectory.'/'.$sFile;
					try {
						$aModuleInfo = ModuleFileReader::GetInstance()->ReadModuleFileInformation($sDirectory.'/'.$sFile);
						SetupWebPage::AddModule($sModuleFilePath, $aModuleInfo[ModuleFileReader::MODULE_INFO_ID], $aModuleInfo[ModuleFileReader::MODULE_INFO_CONFIG]);
					} catch (ModuleFileReaderException $e) {
						continue;
					}
				}
			}
			closedir($hDir);
		} else {
			throw new Exception("Data directory (".$sDirectory.") not found or not readable.");
		}
	}
} // End of class

/** Alias for backward compatibility with old module files in which
 *  the declaration of a module invokes SetupWebPage::AddModule()
 *  whereas the new form is ModuleDiscovery::AddModule()
 */
class SetupWebPage extends ModuleDiscovery
{
	// For backward compatibility with old modules...
	public static function log_error($sText)
	{
		SetupLog::Error($sText);
	}

	public static function log_warning($sText)
	{
		SetupLog::Warning($sText);
	}

	public static function log_info($sText)
	{
		SetupLog::Info($sText);
	}

	public static function log_ok($sText)
	{
		SetupLog::Ok($sText);
	}

	public static function log($sText)
	{
		SetupLog::Ok($sText);
	}
}

/** Ugly patch !!!
 * In order to be able to analyse / load several times
 * the same module file, we rename the class (to avoid duplicate class definitions)
 * and we make the class extends the dummy class below in order to "deactivate" completely
 * the class (in case some piece of code enumerate the classes derived from a well known class)
 * Note that this will not work if someone enumerates the classes that implement a given interface
 */
class DummyHandler
{
}