<?php

/**
 * @package     Joomla.Administrator
 * @subpackage  com_media
 *
 * @copyright   (C) 2017 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\Component\Media\Administrator\Controller;

use Joomla\CMS\Component\ComponentHelper;
use Joomla\CMS\Helper\MediaHelper;
use Joomla\CMS\Language\Text;
use Joomla\CMS\MVC\Controller\BaseController;
use Joomla\CMS\MVC\Model\BaseModel;
use Joomla\CMS\Response\JsonResponse;
use Joomla\CMS\Session\Session;
use Joomla\Component\Media\Administrator\Exception\FileExistsException;
use Joomla\Component\Media\Administrator\Exception\FileNotFoundException;
use Joomla\Component\Media\Administrator\Exception\InvalidPathException;

// phpcs:disable PSR1.Files.SideEffects
\defined('_JEXEC') or die;
// phpcs:enable PSR1.Files.SideEffects

/**
 * Api Media Controller
 *
 * This is NO public api controller, it is internal for the com_media component only!
 *
 * @since  4.0.0
 */
class ApiController extends BaseController
{
    /**
     * Execute a task by triggering a method in the derived class.
     *
     * @param   string  $task  The task to perform. If no matching task is found, the '__default' task is executed, if defined.
     *
     * @return  mixed   The value returned by the called method.
     *
     * @since   4.0.0
     * @throws  \Exception
     */
    public function execute($task)
    {
        $method = $this->input->getMethod();

        $this->task   = $task;
        $this->method = $method;

        try {
            // Check token for requests which do modify files (all except get requests)
            if ($method !== 'GET' && !Session::checkToken('json')) {
                throw new \InvalidArgumentException(Text::_('JINVALID_TOKEN_NOTICE'), 403);
            }

            $doTask = strtolower($method) . ucfirst($task);

            // Record the actual task being fired
            $this->doTask = $doTask;

            if (!in_array($this->doTask, $this->taskMap)) {
                throw new \Exception(Text::sprintf('JLIB_APPLICATION_ERROR_TASK_NOT_FOUND', $task), 405);
            }

            $data = $this->$doTask();

            // Return the data
            $this->sendResponse($data);
        } catch (FileNotFoundException $e) {
            $this->sendResponse($e, 404);
        } catch (FileExistsException $e) {
            $this->sendResponse($e, 409);
        } catch (InvalidPathException $e) {
            $this->sendResponse($e, 400);
        } catch (\Exception $e) {
            $errorCode = 500;

            if ($e->getCode() > 0) {
                $errorCode = $e->getCode();
            }

            $this->sendResponse($e, $errorCode);
        }
    }

    /**
     * Files Get Method
     *
     * Examples:
     *
     * - GET a list of folders below the root:
     *      index.php?option=com_media&task=api.files
     *      /api/files
     * - GET a list of files and subfolders of a given folder:
     *      index.php?option=com_media&task=api.files&format=json&path=/sampledata/cassiopeia
     *      /api/files/sampledata/cassiopeia
     * - GET a list of files and subfolders of a given folder for a given search term:
     *   use recursive=1 to search recursively in the working directory
     *      index.php?option=com_media&task=api.files&format=json&path=/sampledata/cassiopeia&search=nasa5
     *      /api/files/sampledata/cassiopeia?search=nasa5
     *   To look up in same working directory set flag recursive=0
     *      index.php?option=com_media&task=api.files&format=json&path=/sampledata/cassiopeia&search=nasa5&recursive=0
     *      /api/files/sampledata/cassiopeia?search=nasa5&recursive=0
     * - GET file information for a specific file:
     *      index.php?option=com_media&task=api.files&format=json&path=/sampledata/cassiopeia/test.jpg
     *      /api/files/sampledata/cassiopeia/test.jpg
     * - GET a temporary URL to a given file
     *      index.php?option=com_media&task=api.files&format=json&path=/sampledata/cassiopeia/test.jpg&url=1&temp=1
     *      /api/files/sampledata/cassiopeia/test.jpg&url=1&temp=1
     * - GET a temporary URL to a given file
     *      index.php?option=com_media&task=api.files&format=json&path=/sampledata/cassiopeia/test.jpg&url=1
     *      /api/files/sampledata/cassiopeia/test.jpg&url=1
     *
     * @return  array  The data to send with the response
     *
     * @since   4.0.0
     * @throws  \Exception
     */
    public function getFiles()
    {
        // Grab options
        $options              = [];
        $options['url']       = $this->input->getBool('url', false);
        $options['search']    = $this->input->getString('search', '');
        $options['recursive'] = $this->input->getBool('recursive', true);
        $options['content']   = $this->input->getBool('content', false);

        return $this->getModel()->getFiles($this->getAdapter(), $this->getPath(), $options);
    }

    /**
     * Files delete Method
     *
     * Examples:
     *
     * - DELETE an existing folder in a specific folder:
     *      index.php?option=com_media&task=api.files&format=json&path=/sampledata/cassiopeia/test
     *      /api/files/sampledata/cassiopeia/test
     * - DELETE an existing file in a specific folder:
     *      index.php?option=com_media&task=api.files&path=/sampledata/cassiopeia/test.jpg
     *      /api/files/sampledata/cassiopeia/test.jpg
     *
     * @return  null
     *
     * @since   4.0.0
     * @throws  \Exception
     */
    public function deleteFiles()
    {
        if (!$this->app->getIdentity()->authorise('core.delete', 'com_media')) {
            throw new \Exception(Text::_('JLIB_APPLICATION_ERROR_DELETE_NOT_PERMITTED'), 403);
        }

        $this->getModel()->delete($this->getAdapter(), $this->getPath());

        return null;
    }

    /**
     * Files Post Method
     *
     * Examples:
     *
     * - POST a new file or folder into a specific folder, the file or folder information is returned:
     *      index.php?option=com_media&task=api.files&format=json&path=/sampledata/cassiopeia
     *      /api/files/sampledata/cassiopeia
     *
     *      New file body:
     *      {
     *          "name": "test.jpg",
     *          "content":"base64 encoded image"
     *      }
     *      New folder body:
     *      {
     *          "name": "test",
     *      }
     *
     * @return  array  The data to send with the response
     *
     * @since   4.0.0
     * @throws  \Exception
     */
    public function postFiles()
    {
        if (!$this->app->getIdentity()->authorise('core.create', 'com_media')) {
            throw new \Exception(Text::_('JLIB_APPLICATION_ERROR_CREATE_RECORD_NOT_PERMITTED'), 403);
        }

        $adapter      = $this->getAdapter();
        $path         = $this->getPath();
        $content      = $this->input->json;
        $name         = $content->getString('name');
        $mediaContent = base64_decode($content->get('content', '', 'raw'));
        $override     = $content->get('override', false);

        if ($mediaContent) {
            $this->checkContent();

            // A file needs to be created
            $name = $this->getModel()->createFile($adapter, $name, $path, $mediaContent, $override);
        } else {
            // A file needs to be created
            $name = $this->getModel()->createFolder($adapter, $name, $path, $override);
        }

        $options        = [];
        $options['url'] = $this->input->getBool('url', false);

        return $this->getModel()->getFile($adapter, $path . '/' . $name, $options);
    }

    /**
     * Files Put method
     *
     * Examples:
     *
     * - PUT a media file, the file or folder information is returned:
     *      index.php?option=com_media&task=api.files&format=json&path=/sampledata/cassiopeia/test.jpg
     *      /api/files/sampledata/cassiopeia/test.jpg
     *
     *      Update file body:
     *      {
     *          "content":"base64 encoded image"
     *      }
     *
     * - PUT move a file, folder to another one
     *     path : will be taken as the source
     *     index.php?option=com_media&task=api.files&format=json&path=/sampledata/cassiopeia/test.jpg
     *     /api/files/sampledata/cassiopeia/test.jpg
     *
     *     JSON body:
     *     {
     *          "newPath" : "/path/to/destination",
     *          "move"    : "1"
     *     }
     *
     * - PUT copy a file, folder to another one
     *     path : will be taken as the source
     *     index.php?option=com_media&task=api.files&format=json&path=/sampledata/cassiopeia/test.jpg
     *     /api/files/sampledata/cassiopeia/test.jpg
     *
     *     JSON body:
     *     {
     *          "newPath" : "/path/to/destination",
     *          "move"    : "0"
     *     }
     *
     * @return  array  The data to send with the response
     *
     * @since   4.0.0
     * @throws  \Exception
     */
    public function putFiles()
    {
        if (!$this->app->getIdentity()->authorise('core.edit', 'com_media')) {
            throw new \Exception(Text::_('JLIB_APPLICATION_ERROR_EDIT_NOT_PERMITTED'), 403);
        }

        $adapter = $this->getAdapter();
        $path    = $this->getPath();

        $content      = $this->input->json;
        $name         = basename($path);
        $mediaContent = base64_decode($content->get('content', '', 'raw'));
        $newPath      = $content->getString('newPath', null);
        $move         = $content->get('move', true);

        if ($mediaContent != null) {
            $this->checkContent();

            $this->getModel()->updateFile($adapter, $name, str_replace($name, '', $path), $mediaContent);
        }

        if ($newPath != null && $newPath !== $adapter . ':' . $path) {
            list($destinationAdapter, $destinationPath) = explode(':', $newPath, 2);

            if ($move) {
                $destinationPath = $this->getModel()->move($adapter, $path, $destinationPath, false);
            } else {
                $destinationPath = $this->getModel()->copy($adapter, $path, $destinationPath, false);
            }

            $path = $destinationPath;
        }

        return $this->getModel()->getFile($adapter, $path);
    }

    /**
     * Send the given data as JSON response in the following format:
     *
     * {"success":true,"message":"ok","messages":null,"data":[{"type":"dir","name":"banners","path":"//"}]}
     *
     * @param   mixed    $data          The data to send
     * @param   integer  $responseCode  The response code
     *
     * @return  void
     *
     * @since   4.0.0
     */
    private function sendResponse($data = null, int $responseCode = 200)
    {
        // Set the correct content type
        $this->app->setHeader('Content-Type', 'application/json');

        // Set the status code for the response
        http_response_code($responseCode);

        // Send the data
        echo new JsonResponse($data);

        $this->app->close();
    }

    /**
     * Method to get a model object, loading it if required.
     *
     * @param   string  $name    The model name. Optional.
     * @param   string  $prefix  The class prefix. Optional.
     * @param   array   $config  Configuration array for model. Optional.
     *
     * @return  BaseModel|boolean  Model object on success; otherwise false on failure.
     *
     * @since   4.0.0
     */
    public function getModel($name = 'Api', $prefix = 'Administrator', $config = [])
    {
        return parent::getModel($name, $prefix, $config);
    }

    /**
     * Performs various checks if it is allowed to save the content.
     *
     * @return  void
     *
     * @since   4.0.0
     * @throws  \Exception
     */
    private function checkContent()
    {
        $helper              = new MediaHelper();
        $contentLength       = $this->input->server->getInt('CONTENT_LENGTH');
        $params              = ComponentHelper::getParams('com_media');
        $paramsUploadMaxsize = $params->get('upload_maxsize', 0) * 1024 * 1024;
        $uploadMaxFilesize   = $helper->toBytes(ini_get('upload_max_filesize'));
        $postMaxSize         = $helper->toBytes(ini_get('post_max_size'));
        $memoryLimit         = $helper->toBytes(ini_get('memory_limit'));

        if (
            ($paramsUploadMaxsize > 0 && $contentLength > $paramsUploadMaxsize)
            || ($uploadMaxFilesize > 0 && $contentLength > $uploadMaxFilesize)
            || ($postMaxSize > 0 && $contentLength > $postMaxSize)
            || ($memoryLimit > -1 && $contentLength > $memoryLimit)
        ) {
            throw new \Exception(Text::_('COM_MEDIA_ERROR_WARNFILETOOLARGE'), 403);
        }
    }

    /**
     * Get the Adapter.
     *
     * @return  string
     *
     * @since   4.0.0
     */
    private function getAdapter()
    {
        $parts = explode(':', $this->input->getString('path', ''), 2);

        if (count($parts) < 1) {
            return null;
        }

        return $parts[0];
    }

    /**
     * Get the Path.
     *
     * @return  string
     *
     * @since   4.0.0
     */
    private function getPath()
    {
        $parts = explode(':', $this->input->getString('path', ''), 2);

        if (count($parts) < 2) {
            return null;
        }

        return $parts[1];
    }
}