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<?php

namespace ProcessWire;

class ProcessCacheControl extends Process implements Module
{
    /** @var string The name of the GET parameter that determines the action to perform. */
    public const ACTION_PARAMETER_NAME = 'action';

    /** @var string The base name for the required permission for using this module. */
    public const MODULE_PERMISSION = 'cache-control';

    /** @var string The format for optional action-specific permissions. @see self::getActionPermissionName */
    public const ACTION_PERMISSION_FORMAT = '%1$s-%2$s';

    /** @var string The ID of the default cache action. */
    public const DEFAULT_ACTION_ID = 'all';

    public static function getModuleInfo()
    {
        return [
            'title' => __('Cache Control'),
            'summary' => __('Adds an entry to the setup menu to clear all caches. Provides an API to add cache management actions and an interface to execute them.'),
            'author' => "Moritz L'Hoest",
            'href' => 'https://github.com/MoritzLost/ProcessCacheControl',
            'version' => '1.1.0',
            'icon' => 'floppy-o',
            'singular' => true,
            'useNavJSON' => true,
            'installs' => 'CacheControlTools',
            'requires' => [
                'ProcessWire>=3.0.130',
                'PHP>=7.1',
            ],
            'permission' => self::MODULE_PERMISSION,
            'permissions' => [
                self::MODULE_PERMISSION => __('Use the cache control interface provided by the ProcessCacheControl module and execute cache control actions.')
            ],
            'page' => [
                'name' => 'cache-control',
                'parent' => 'setup',
                'title' => __('Cache Control'),
            ],
        ];
    }

    /**
     * Check if the user can instantiate and use this module. Check this as a
     * static method BEFORE instantiating the module, because it will throw an
     * error if the user can't access it.
     *
     * @param User|null $user   The user whose access to check. Defaults to the current user.
     * @return boolean
     */
    public static function canUseModule(?User $user = null): bool
    {
        $user = $user ?? wire('user');
        return $user->hasPermission(self::MODULE_PERMISSION);
    }

    /**
     * Get all actions that a user is allowed to execute.
     *
     * @param User|null $user   The user whose access to check. Defaults to the current user.
     * @return array
     */
    public function getAllowedActions(?User $user = null): array
    {
        $user = $user ?? wire('user');
        return array_filter($this->getActionDefinitions(), function (array $action) use ($user) {
            return $this->canExecuteAction($action['id'], $user);
        });
    }

    /**
     * Get all available cache actions. This method can be hooked to add
     * additional cache actions. Action definitions are associative arrays. The
     * following array keys are required:
     *  - id (string): The ID for this job, used as a GET parameter.
     *  - title (string): The display title for the job.
     *  - callback (callable): Any callable or closure to call when this method gets executed.
     *
     * @return array An array of action definitions (associative arrays).
     */
    public function ___getActionDefinitions(): array
    {
        return [
            [
                'id' => self::DEFAULT_ACTION_ID,
                'title' => $this->_('Clear all'),
                'icon' => 'floppy-o',
                'callback' => [$this, 'clearAll'],
            ],
        ];
    }

    /**
     * Perform the action specified by the passed action ID. Actions can be added
     * through hooks, @see ProcessCacheControl::getActionDefinitions.
     *
     * @param string $actionId
     * @return void
     */
    public function ___executeAction(string $actionId): void
    {
        // get the action definition, if it exists
        $actionDefinition = $this->getActionDefinitionById($actionId);
        if (null === $actionDefinition) {
            throw new \InvalidArgumentException(
                sprintf($this->_('Action with ID %s does not exist.'), $actionId)
            );
        }
        // if a specific permission for this action exists, the user needs it in order
        // to execute this action. otherwise, the user only needs the general
        // cache-control permission
        $actionPermissionName = $this->getActionPermissionName($actionId);
        $actionPermissionExists = $this->permissions->has($actionPermissionName);
        $actionAllowed = $this->canExecuteAction($actionId, $this->user);
        if (!$actionAllowed) {
            $permissionDeniedMessage = $actionPermissionExists
                ? $this->_('Prevented user %1$s from executing cache control action %2$s because it requires the following permissions: %3$s, %4$s')
                : $this->_('Prevented user %1$s from executing cache control action %2$s because it requires the following permission: %3$s');
            $this->modules->get('CacheControlTools')->logMessage(sprintf(
                $permissionDeniedMessage,
                $this->user->name,
                $actionId,
                self::MODULE_PERMISSION,
                $actionPermissionName
            ));
        } else {
            call_user_func($actionDefinition['callback'], $this->modules->get('CacheControlTools'));
        }
    }

    /**
     * Clear all caches according to the module configuration. This is the default
     * action that the module provides out of the box.
     *
     * @param CacheControlTools|null $tools
     * @return void
     */
    public function ___clearAll(?CacheControlTools $tools): void
    {
        // automatically instantiate $tools so the method can be called without arguments
        if (null === $tools) $tools = $this->modules->get('CacheControlTools')->verbose();

        // clear all configured specified entries / namespaces in the database cache
        $cache = $this->wire('cache');
        if ($this->WireCacheExpireAll) {
            $cache->expireAll();
            $tools->logMessage($this->_('Expired all WireCache entries that have an expiration data ($cache->expireAll()).'));
        }
        if ($this->WireCacheDeleteAll) {
            $cache->deleteAll();
            $tools->logMessage($this->_('Deleted all WireCache entries except for reserved system entries ($cache->deleteAll()).'));
        }
        if (!empty($namespaceList = $this->parseNamespaceList($this->WireCacheDeleteNamespaces))) {
            $tools->clearWireCacheByNamespaces($namespaceList);
        }

        // clear selected cache directories
        if ($this->ClearCacheDirectories) {
            foreach ($this->ClearCacheDirectories as $dir) {
                $tools->clearCacheDirectoryContent($dir);
            }
        }

        // clear procache through the api, if it is installed
        if ($this->ClearProCache) {
            $procache = $this->wire('procache');
            if (null !== $procache) {
                $procache->clearAll();
                $tools->logMessage($this->_('Cleared the ProCache module cache ($procache->clearAll()).'));
            }
        }

        // clear all stored asset versions
        if ($this->ClearAllAssetVersions) {
            $tools->clearAllAssetVersions();
        }
    }

    /**
     * Check if a user can execute the given action.
     *
     * @param string $actionId  The ID of the action to check.
     * @param User|null $user   The user whose access to check. Defaults to the current user.
     * @return array
     */
    public function canExecuteAction(string $actionId, ?User $user = null): bool
    {
        $user = $user ?? wire('user');
        $actionPermissionName = $this->getActionPermissionName($actionId);
        $hasModulePermission = $user->hasPermission(self::MODULE_PERMISSION);
        $actionPermissionExists = $this->permissions->has($actionPermissionName);
        // the user "lacks" the permissions for this action only if it exists and they don't have it
        $lacksActionPermission = $actionPermissionExists && !$user->hasPermission($actionPermissionName);
        return $hasModulePermission && !$lacksActionPermission;
    }

    /**
     * Get the name of the optional permission for the passed action ID.
     *
     * @param string $actionId  The ID to get the permission name for.
     * @return string
     */
    public function getActionPermissionName(string $actionId): string
    {
        return sprintf(
            self::ACTION_PERMISSION_FORMAT,
            self::MODULE_PERMISSION,
            $actionId
        );
    }

    /**
     * Find an action definition by it's ID.
     *
     * @param string $action    The ID of the action to find.
     * @return array|null
     */
    public function getActionDefinitionById(string $action): ?array
    {
        foreach ($this->getActionDefinitions() as $actionDefinition) {
            if ($actionDefinition['id'] === $action) {
                return $actionDefinition;
            }
        }
        return null;
    }

    /**
     * Check if the specified action exists.
     *
     * @param string $actionId  The ID of the action to check.
     * @return boolean
     */ 
    public function actionExists(string $actionId): bool
    {
        return $this->getActionDefinitionById($actionId) !== null;
    }

    /**
     * Get the URL of the Process Page in the backend, or a URL that directly
     * executes an action if an $actionId is provided.
     *
     * @param string|null $actionId     Optional ID of the action to get an URL for.
     * @return string
     */
    public function getProcessUrl(?string $actionId = null): string
    {
        $ProcessPage = wire('pages')->get(2)->findOne('name=cache-control, include=all');
        return $ProcessPage->url([
            'data' => $actionId ? [self::ACTION_PARAMETER_NAME => $actionId] : []
        ]);
    }


    /**
     * Called by ProcessWire during module installation.
     *
     * @return void
     */
    public function install()
    {
        // save an installation message to force creation of the cache-control log file if it doesnt exist yet
        $tools = $this->modules->get('CacheControlTools');
        $tools->logMessage($this->_('ProcessCacheControl installed successfully. Creating the dedicated log file.'));
        return parent::install();
    }


    /**
     * The main Process that gets executed on the module's page. Performs the
     * action specified as a GET parameter (if any) and outputs all new log
     * messages. Will also display buttons for all available cache actions.
     *
     * @return void
     */
    public function ___execute()
    {
        // save the current amount of log messages, so we can determine all new
        // log messages after executing the cache clear action
        $previousLogTotal = $this->log->getTotalEntries(CacheControlTools::LOG_NAME);

        // if the URL specifies an action, execute it
        $actionId = $this->wire('input')->get(self::ACTION_PARAMETER_NAME);
        if ($actionId) {
            $actionExists = $this->actionExists($actionId);
            $userCanExecute = $actionExists && $this->canExecuteAction($actionId, $this->user);
            $actionDisplayName = $actionExists ? $this->getActionDefinitionById($actionId)['title'] : $actionId;
            if (!$actionExists) {
                $this->error(sprintf($this->_("Requested action '%s' does not exist."), $actionDisplayName));
            } elseif (!$userCanExecute) {
                $this->error(sprintf($this->_("You lack the permission to execute the action '%s'."), $actionDisplayName));
            } else {
                $this->executeAction($actionId);
                $this->message(sprintf($this->_("Successfully executed action '%s'. Check the log output below for more information."), $actionDisplayName));
            }
        }

        // get all new log messages that were added by the cache clear action
        $newLogTotal = $this->log->getTotalEntries(CacheControlTools::LOG_NAME);
        $newLogEntries = $newLogTotal > $previousLogTotal
            ? array_reverse($this->log->getEntries(CacheControlTools::LOG_NAME, [
                    'limit' => $newLogTotal - $previousLogTotal,
                ]))
            : null;

        // the following code generates the module page output

        // list available actions
        $buttonWrapper = $this->modules->get('InputfieldFieldset');
        $buttonWrapper->label = $this->_('Available Cache Control Actions');
        $buttonWrapper->columnWidth = 50;
        $buttonWrapper->collapsed = Inputfield::collapsedNever;
        foreach ($this->getAllowedActions() as $actionDefinition) {
            $action = $this->modules->get('InputfieldButton');
            $action->value = $actionDefinition['title'];
            $action->href = $this->page->url(['data' => [
                'action' => $actionDefinition['id']
            ]]);
            $buttonWrapper->add($action);
        }

        // list new log entries
        $logOutput = $this->modules->get('InputfieldMarkup');
        $logOutput->label = $this->_('Log output for the current action');
        $logOutput->columnWidth = 50;
        $logOutput->collapsed = Inputfield::collapsedNever;
        if ($newLogEntries) {
            $logOutput->value = "<code><pre>" . implode("\n", array_map(function ($line) {
                return $line['text'];
            }, $newLogEntries)) . "</code></pre>";
        } else {
            $logOutput->value = sprintf("<p>%s</p>", $this->_('No new log entries. Start a job by selecting one of the options to the left.'));
        }

        // wrap everything inside a form inputfield
        $actionForm = $this->modules->get('InputfieldForm');
        $actionForm->add($buttonWrapper);
        $actionForm->add($logOutput);

        return $actionForm->render();
    }

    /**
     * Called by ProcessWire to create the flyout menu in the ProcessWire Admin.
     *
     * @param array $options
     * @return void
     */
    public function ___executeNavJSON(array $options = [])
    {
        $options['itemLabel'] = 'title';
        $options['add'] = false;
        $options['edit'] = sprintf("?%s={id}", self::ACTION_PARAMETER_NAME);
        $options['items'] = $this->getAllowedActions();
        return parent::___executeNavJSON($options);
    }

    /**
     * Parses a list of newline-seperated cache namespaces, filtering out blank lines.
     *
     * @param string $namespaces    The multiline string to parse.
     * @return array
     */
    protected function parseNamespaceList(string $namespaces): array
    {
        return array_filter(
            preg_split("/[\r\n]+/", $namespaces),
            function ($namespace) {
                return !empty($namespace);
            }
        );
    }
}