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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Workflow;

\defined('JPATH_PLATFORM') or die;

use Joomla\CMS\Application\CMSApplication;
use Joomla\CMS\Event\AbstractEvent;
use Joomla\CMS\Extension\ComponentInterface;
use Joomla\CMS\Factory;
use Joomla\CMS\Plugin\PluginHelper;
use Joomla\CMS\Table\Category;
use Joomla\Database\DatabaseDriver;
use Joomla\Database\ParameterType;
use Joomla\Registry\Registry;
use Joomla\Utilities\ArrayHelper;

/**
 * Workflow Class.
 *
 * @since  4.0.0
 */
class Workflow
{
	/**
	 * The booted component
	 *
	 * @var ComponentInterface
	 */
	protected $component = null;

	/**
	 * Name of the extension the workflow belong to
	 *
	 * @var    string
	 * @since  4.0.0
	 */
	protected $extension = null;

	/**
	 * Application Object
	 *
	 * @var    CMSApplication
	 * @since  4.0.0
	 */
	protected $app;

	/**
	 * Database Driver
	 *
	 * @var    DatabaseDriver
	 * @since  4.0.0
	 */
	protected $db;

	/**
	 * Condition to names mapping
	 *
	 * @since  4.0.0
	 */
	const CONDITION_NAMES = [
		self::CONDITION_PUBLISHED   => 'JPUBLISHED',
		self::CONDITION_UNPUBLISHED => 'JUNPUBLISHED',
		self::CONDITION_TRASHED     => 'JTRASHED',
		self::CONDITION_ARCHIVED    => 'JARCHIVED',
	];

	/**
	 * Every item with a state which has the condition PUBLISHED is visible/active on the page
	 */
	const CONDITION_PUBLISHED = 1;

	/**
	 * Every item with a state which has the condition UNPUBLISHED is not visible/inactive on the page
	 */
	const CONDITION_UNPUBLISHED = 0;

	/**
	 * Every item with a state which has the condition TRASHED is trashed
	 */
	const CONDITION_TRASHED = -2;

	/**
	 * Every item with a state which has the condition ARCHIVED is archived
	 */
	const CONDITION_ARCHIVED = 2;

	/**
	 * Class constructor
	 *
	 * @param   string           $extension  The extension name
	 * @param   ?CMSApplication  $app        Application Object
	 * @param   ?DatabaseDriver  $db         Database Driver Object
	 *
	 * @since   4.0.0
	 */
	public function __construct(string $extension, ?CMSApplication $app = null, ?DatabaseDriver $db = null)
	{
		$this->extension = $extension;

		// Initialise default objects if none have been provided
		$this->app = $app ?: Factory::getApplication();
		$this->db = $db ?: Factory::getDbo();
	}

	/**
	 * Returns the translated condition name, based on the given number
	 *
	 * @param   integer  $value  The condition ID
	 *
	 * @return  string
	 *
	 * @since   4.0.0
	 */
	public function getConditionName(int $value): string
	{
		$component = $this->getComponent();

		if ($component instanceof WorkflowServiceInterface)
		{
			$conditions = $component->getConditions($this->extension);
		}
		else
		{
			$conditions = self::CONDITION_NAMES;
		}

		return ArrayHelper::getValue($conditions, $value, '', 'string');
	}

	/**
	 * Returns the booted component
	 *
	 * @return ComponentInterface
	 *
	 * @since   4.0.0
	 */
	protected function getComponent()
	{
		if (\is_null($this->component))
		{
			$parts = explode('.', $this->extension);

			$this->component = $this->app->bootComponent($parts[0]);
		}

		return $this->component;
	}

	/**
	 * Try to load a workflow default stage by category ID.
	 *
	 * @param   integer   $catId  The category ID.
	 *
	 * @return  boolean|integer  An integer, holding the stage ID or false
	 * @since   4.0.0
	 */
	public function getDefaultStageByCategory($catId = 0)
	{
		// Let's check if a workflow ID is assigned to a category
		$category = new Category($this->db);

		$categories = array_reverse($category->getPath($catId));

		$workflow_id = 0;

		foreach ($categories as $cat)
		{
			$cat->params = new Registry($cat->params);

			$workflow_id = $cat->params->get('workflow_id');

			if ($workflow_id == 'inherit')
			{
				$workflow_id = 0;

				continue;
			}
			elseif ($workflow_id == 'use_default')
			{
				$workflow_id = 0;

				break;
			}
			elseif ($workflow_id > 0)
			{
				break;
			}
		}

		// Check if the workflow exists
		if ($workflow_id = (int) $workflow_id)
		{
			$query = $this->db->getQuery(true);

			$query->select(
				[
					$this->db->quoteName('ws.id')
				]
			)
				->from(
					[
						$this->db->quoteName('#__workflow_stages', 'ws'),
						$this->db->quoteName('#__workflows', 'w'),
					]
				)
				->where(
					[
						$this->db->quoteName('ws.workflow_id') . ' = ' . $this->db->quoteName('w.id'),
						$this->db->quoteName('ws.default') . ' = 1',
						$this->db->quoteName('w.published') . ' = 1',
						$this->db->quoteName('ws.published') . ' = 1',
						$this->db->quoteName('w.id') . ' = :workflowId',
						$this->db->quoteName('w.extension') . ' = :extension',
					]
				)
				->bind(':workflowId', $workflow_id, ParameterType::INTEGER)
				->bind(':extension', $this->extension);

			$stage_id = (int) $this->db->setQuery($query)->loadResult();

			if (!empty($stage_id))
			{
				return $stage_id;
			}
		}

		// Use default workflow
		$query  = $this->db->getQuery(true);

		$query->select(
			[
				$this->db->quoteName('ws.id')
			]
		)
			->from(
				[
					$this->db->quoteName('#__workflow_stages', 'ws'),
					$this->db->quoteName('#__workflows', 'w'),
				]
			)
			->where(
				[
					$this->db->quoteName('ws.default') . ' = 1',
					$this->db->quoteName('ws.workflow_id') . ' = ' . $this->db->quoteName('w.id'),
					$this->db->quoteName('w.published') . ' = 1',
					$this->db->quoteName('ws.published') . ' = 1',
					$this->db->quoteName('w.default') . ' = 1',
					$this->db->quoteName('w.extension') . ' = :extension'
				]
			)
			->bind(':extension', $this->extension);

		$stage_id = (int) $this->db->setQuery($query)->loadResult();

		// Last check if we have a workflow ID
		if (!empty($stage_id))
		{
			return $stage_id;
		}

		return false;
	}

	/**
	 * Check if a transition can be executed
	 *
	 * @param   integer[]  $pks           The item IDs, which should use the transition
	 * @param   integer    $transitionId  The transition which should be executed
	 *
	 * @return  object | null
	 */
	public function getValidTransition(array $pks, int $transitionId)
	{
		$pks = ArrayHelper::toInteger($pks);
		$pks = array_filter($pks);

		if (!\count($pks))
		{
			return null;
		}

		$query = $this->db->getQuery(true);

		$user = $this->app->getIdentity();

		$query->select(
			[
				$this->db->quoteName('t.id'),
				$this->db->quoteName('t.to_stage_id'),
				$this->db->quoteName('t.from_stage_id'),
				$this->db->quoteName('t.options'),
				$this->db->quoteName('t.workflow_id'),
			]
		)
			->from(
				[
					$this->db->quoteName('#__workflow_transitions', 't'),
				]
			)
			->join('INNER', $this->db->quoteName('#__workflows', 'w'))
			->join(
				'LEFT',
				$this->db->quoteName('#__workflow_stages', 's'),
				$this->db->quoteName('s.id') . ' = ' . $this->db->quoteName('t.to_stage_id')
			)
			->where(
				[
					$this->db->quoteName('t.id') . ' = :id',
					$this->db->quoteName('t.workflow_id') . ' = ' . $this->db->quoteName('w.id'),
					$this->db->quoteName('t.published') . ' = 1',
					$this->db->quoteName('w.extension') . ' = :extension'
				]
			)
			->bind(':id', $transitionId, ParameterType::INTEGER)
			->bind(':extension', $this->extension);

		$transition = $this->db->setQuery($query)->loadObject();

		$parts = explode('.', $this->extension);
		$option = reset($parts);

		if (!empty($transition->id) && $user->authorise('core.execute.transition', $option . '.transition.' . (int) $transition->id))
		{
			return $transition;
		}

		return null;
	}

	/**
	 * Executes a transition to change the current state in the association table
	 *
	 * @param   integer[]  $pks           The item IDs, which should use the transition
	 * @param   integer    $transitionId  The transition which should be executed
	 *
	 * @return  boolean
	 */
	public function executeTransition(array $pks, int $transitionId): bool
	{
		$pks = ArrayHelper::toInteger($pks);
		$pks = array_filter($pks);

		if (!\count($pks))
		{
			return true;
		}

		$transition = $this->getValidTransition($pks, $transitionId);

		if (is_null($transition))
		{
			return false;
		}

		$transition->options = new Registry($transition->options);

		// Check if the items can execute this transition
		foreach ($pks as $pk)
		{
			$assoc = $this->getAssociation($pk);

			// The transition has to be in the same workflow
			if (!\in_array($transition->from_stage_id, [
					$assoc->stage_id,
					-1
				]
			) || $transition->workflow_id !== $assoc->workflow_id)
			{
				return false;
			}
		}

		PluginHelper::importPlugin('workflow');

		$eventResult = $this->app->getDispatcher()->dispatch(
			'onWorkflowBeforeTransition',
			AbstractEvent::create(
				'onWorkflowBeforeTransition',
				[
					'eventClass'     => 'Joomla\CMS\Event\Workflow\WorkflowTransitionEvent',
					'subject'        => $this,
					'extension'      => $this->extension,
					'pks'            => $pks,
					'transition'     => $transition,
					'stopTransition' => false,
				]
			)
		);

		if ($eventResult->getArgument('stopTransition'))
		{
			return false;
		}

		$success = $this->updateAssociations($pks, (int) $transition->to_stage_id);

		if ($success)
		{
			$this->app->getDispatcher()->dispatch(
				'onWorkflowAfterTransition',
				AbstractEvent::create(
					'onWorkflowAfterTransition',
					[
						'eventClass' => 'Joomla\CMS\Event\Workflow\WorkflowTransitionEvent',
						'subject'    => $this,
						'extension'  => $this->extension,
						'pks'        => $pks,
						'transition' => $transition
					]
				)
			);
		}

		return $success;
	}

	/**
	 * Creates an association for the workflow_associations table
	 *
	 * @param   integer  $pk     ID of the item
	 * @param   integer  $state  ID of state
	 *
	 * @return  boolean
	 *
	 * @since  4.0.0
	 */
	public function createAssociation(int $pk, int $state): bool
	{
		try
		{
			$query = $this->db->getQuery(true);

			$query->insert($this->db->quoteName('#__workflow_associations'))
				->columns(
					[
						$this->db->quoteName('item_id'),
						$this->db->quoteName('stage_id'),
						$this->db->quoteName('extension'),
					]
				)
				->values(':pk, :state, :extension')
				->bind(':pk', $pk, ParameterType::INTEGER)
				->bind(':state', $state, ParameterType::INTEGER)
				->bind(':extension', $this->extension);

			$this->db->setQuery($query)->execute();
		}
		catch (\Exception $e)
		{
			return false;
		}

		return true;
	}

	/**
	 * Update an existing association with a new state
	 *
	 * @param   array    $pks    An Array of item IDs which should be changed
	 * @param   integer  $state  The new state ID
	 *
	 * @return  boolean
	 *
	 * @since  4.0.0
	 */
	public function updateAssociations(array $pks, int $state): bool
	{
		$pks = ArrayHelper::toInteger($pks);

		try
		{
			$query = $this->db->getQuery(true);

			$query->update($this->db->quoteName('#__workflow_associations'))
				->set($this->db->quoteName('stage_id') . ' = :state')
				->whereIn($this->db->quoteName('item_id'), $pks)
				->where($this->db->quoteName('extension') . ' = :extension')
				->bind(':state', $state, ParameterType::INTEGER)
				->bind(':extension', $this->extension);

			$this->db->setQuery($query)->execute();
		}
		catch (\Exception $e)
		{
			return false;
		}

		return true;
	}

	/**
	 * Removes associations from the workflow_associations table
	 *
	 * @param   integer[]  $pks  ID of content
	 *
	 * @return  boolean
	 *
	 * @since  4.0.0
	 */
	public function deleteAssociation(array $pks): bool
	{
		$pks = ArrayHelper::toInteger($pks);

		try
		{
			$query = $this->db->getQuery(true);

			$query
				->delete($this->db->quoteName('#__workflow_associations'))
				->whereIn($this->db->quoteName('item_id'), $pks)
				->where($this->db->quoteName('extension') . ' = :extension')
				->bind(':extension', $this->extension);

			$this->db->setQuery($query)->execute();
		}
		catch (\Exception $e)
		{
			return false;
		}

		return true;
	}

	/**
	 * Loads an existing association item with state and item ID
	 *
	 * @param   integer  $itemId  The item ID to load
	 *
	 * @return  \stdClass|null
	 *
	 * @since  4.0.0
	 */
	public function getAssociation(int $itemId): ?\stdClass
	{
		$query = $this->db->getQuery(true);

		$query->select(
			[
				$this->db->quoteName('a.item_id'),
				$this->db->quoteName('a.stage_id'),
				$this->db->quoteName('s.workflow_id'),
			]
		)
			->from($this->db->quoteName('#__workflow_associations', 'a'))
			->innerJoin(
				$this->db->quoteName('#__workflow_stages', 's'),
				$this->db->quoteName('a.stage_id') . ' = ' . $this->db->quoteName('s.id')
			)
			->where(
				[
					$this->db->quoteName('item_id') . ' = :id',
					$this->db->quoteName('extension') . ' = :extension',
				]
			)
			->bind(':id', $itemId, ParameterType::INTEGER)
			->bind(':extension', $this->extension);

		return $this->db->setQuery($query)->loadObject();
	}
}