Moving tasks - Preliminary version

* Works when moving tasks without dependencies. Crashes with a SQL error
due to FK violation when moving tasks with interdependencies (LTC ID?)

* The form is unable to force removal of external dependencies at this
time.

* Related PL/PgSQL code stored in database/temp.sql at this time.

database/tasks-move-sub.sql

@@ -145,3 +145,23 @@ $tasks_move_down$;
 
 REVOKE EXECUTE ON FUNCTION tasks_move_down( INT , INT , BOOLEAN ) FROM PUBLIC;
 GRANT EXECUTE ON FUNCTION tasks_move_down( INT , INT , BOOLEAN ) TO :webapp_user;
+
+
+/*
+ * Move a set of tasks from a container to another.
+ */
+DROP FUNCTION IF EXISTS tasks_move( _fromTask BOOLEAN , _fromId INT , _toTask BOOLEAN , _toId INT , _force BOOLEAN , _tasks INT[] );
+CREATE FUNCTION tasks_move( _fromTask BOOLEAN , _fromId INT , _toTask BOOLEAN , _toId INT , _force BOOLEAN , _tasks INT[] )
+		RETURNS INT
+		LANGUAGE PLPGSQL
+		STRICT VOLATILE
+		SECURITY DEFINER
+	AS $tasks_move$
+
+BEGIN
+	RETURN 0;
+END;
+$tasks_move$;
+
+REVOKE EXECUTE ON FUNCTION tasks_move( INT , INT , BOOLEAN ) FROM PUBLIC;
+GRANT EXECUTE ON FUNCTION tasks_move( INT , INT , BOOLEAN ) TO :webapp_user;

database/temp.sql

@@ -0,0 +1,168 @@
+\i database/config.sql
+
+/*
+ * Move a set of tasks from a container to another.
+ * Returns the following error codes:
+ *	0	No error
+ *	1	Deleted tasks
+ *	2	Moved tasks (not in specified container)
+ *	3	Target item/task deleted
+ *	4	Moving tasks to one of their children
+ *	5	Dependencies would be broken, and _force is FALSE
+ */
+DROP FUNCTION IF EXISTS tasks_move( BOOLEAN , INT , BOOLEAN , INT , BOOLEAN , INT[] );
+CREATE FUNCTION tasks_move( _fromTask BOOLEAN , _fromId INT , _toTask BOOLEAN , _toId INT , _force BOOLEAN , _tasks INT[] )
+		RETURNS INT
+		LANGUAGE PLPGSQL
+		STRICT VOLATILE
+		SECURITY DEFINER
+	AS $tasks_move$
+
+DECLARE
+	_i		INT;
+	_ltc_source	INT;
+	_ltc_dest	INT;
+
+BEGIN
+	-- Create the temporary table for tasks
+	PERFORM _tm_create_temp( _tasks );
+
+	-- Make sure all specified tasks exists
+	SELECT INTO _i COUNT( * )
+		FROM _tm_tasks
+			INNER JOIN tasks USING( task_id );
+	IF _i <> array_length( _tasks , 1 ) THEN
+		RETURN 1;
+	END IF;
+
+	-- Make sure all tasks match the specified container
+	PERFORM task_id
+		FROM _tm_tasks
+			INNER JOIN tasks USING( task_id )
+		WHERE ( task_id_parent IS NOT NULL ) <> _fromTask
+			OR ( CASE
+				WHEN task_id_parent IS NULL THEN
+					item_id
+				ELSE
+					task_id_parent
+				END ) <> _fromId;
+	IF FOUND THEN
+		RETURN 2;
+	END IF;
+
+	-- If the source and destination are the same, we're done.
+	IF _fromTask = _toTask AND _fromId = _toId THEN
+		RETURN 0;
+	END IF;
+
+	-- Make sure that the destination exists. Also get the target LTC ID.
+	IF _toTask THEN
+		SELECT INTO _ltc_dest ltc_id
+			FROM logical_task_containers
+			WHERE task_id = _toId;
+	ELSE
+		SELECT INTO _ltc_dest ltc_id
+			FROM logical_task_containers
+			WHERE task_id IS NULL;
+		PERFORM item_id FROM items WHERE item_id = _toId;
+	END IF;
+	IF NOT FOUND THEN
+		RETURN 3;
+	END IF;
+
+	-- If we're moving to a task, make sure it isn't a child of any of the
+	-- tasks that are being moved.
+	IF _toTask THEN
+		PERFORM * FROM _tm_tasks _mv
+			INNER JOIN tasks_tree _tree
+				ON _mv.task_id = _tree.task_id_parent
+			WHERE task_id_child = _toId;
+		IF FOUND THEN
+			RETURN 4;
+		END IF;
+	END IF;
+
+	-- Get the source LTC ID.
+	IF _fromTask THEN
+		SELECT INTO _ltc_source ltc_id
+			FROM logical_task_containers
+			WHERE task_id = _fromId;
+	ELSE
+		SELECT INTO _ltc_source ltc_id
+			FROM logical_task_containers
+			WHERE task_id IS NULL;
+	END IF;
+
+	-- If we're changing the LTC, handle dependencies.
+	IF _ltc_source <> _ltc_dest AND NOT _force THEN
+		-- Check them if we're not forcing the move.
+		PERFORM _tdn.task_id
+			FROM taskdep_nodes _tdn
+				INNER JOIN _tm_tasks _tmt
+					USING( task_id )
+				LEFT OUTER JOIN _tm_tasks _tmt2
+					ON _tmt2.task_id = _tdn.task_id_copyof
+			WHERE _tdn.tnode_depth = 1 AND _tmt2.task_id IS NULL;
+		IF FOUND THEN
+			RETURN 5;
+		END IF;
+	ELSIF _ltc_source <> _ltc_dest AND _force THEN
+		-- Otherwise, break them.
+		DELETE FROM task_dependencies
+			WHERE taskdep_id IN (
+				SELECT DISTINCT _tdn.taskdep_id
+					FROM taskdep_nodes _tdn
+						INNER JOIN _tm_tasks _tmt
+							USING( task_id )
+						LEFT OUTER JOIN _tm_tasks _tmt2
+							ON _tmt2.task_id = _tdn.task_id_copyof
+					WHERE _tdn.tnode_depth = 1 AND _tmt2.task_id IS NULL
+			);
+	END IF;
+
+	-- We're ready to move the tasks themselves.
+	IF _toTask THEN
+		SELECT INTO _i item_id FROM tasks WHERE task_id = _toId;
+	ELSE
+		_i := _toId;
+	END IF;
+	UPDATE tasks SET item_id = _i , ltc_id = _ltc_dest
+		WHERE task_id IN (
+			SELECT task_id FROM _tm_tasks
+		);
+
+	RETURN 0;
+END;
+$tasks_move$;
+
+REVOKE EXECUTE ON FUNCTION tasks_move( BOOLEAN , INT , BOOLEAN , INT , BOOLEAN , INT[] ) FROM PUBLIC;
+GRANT EXECUTE ON FUNCTION tasks_move( BOOLEAN , INT , BOOLEAN , INT , BOOLEAN , INT[] ) TO :webapp_user;
+
+
+/*
+ * Function used by tasks_move to insert all tasks into a temporary table.
+ */
+DROP FUNCTION IF EXISTS _tm_create_temp( INT[] );
+CREATE FUNCTION _tm_create_temp( _tasks INT[] )
+		RETURNS VOID
+		LANGUAGE PLPGSQL
+		STRICT VOLATILE
+		SECURITY INVOKER
+	AS $_tm_create_temp$
+DECLARE
+	_i	INT;
+BEGIN
+	SET LOCAL client_min_messages=warning;
+	DROP TABLE IF EXISTS _tm_tasks;
+	RESET client_min_messages;
+
+	CREATE TEMPORARY TABLE _tm_tasks(
+		task_id	INT
+	) ON COMMIT DROP;
+	FOR _i IN array_lower( _tasks , 1 ) .. array_upper( _tasks , 1 )
+	LOOP
+		INSERT INTO _tm_tasks( task_id ) VALUES ( _tasks[ _i ] );
+	END LOOP;
+END;
+$_tm_create_temp$;
+REVOKE EXECUTE ON FUNCTION _tm_create_temp( INT[] ) FROM PUBLIC;

includes/t-data/dao_tasks.inc.php

@@ -29,6 +29,25 @@ class DAO_Tasks
 	}
 
 
+	public function getActiveTasksAssoc( )
+	{
+		$qr = $this->query(
+			'SELECT id , item , parent_task , title FROM tasks_list '
+			.	'WHERE completed_at IS NULL '
+			.	'ORDER BY priority DESC , badness , added_at DESC' )->execute( );
+		$result = array( );
+		foreach ( $qr as $task ) {
+			$container = $task->parent_task === null ? 'I' : 'T';
+			$container .= $container == 'I' ? $task->item : $task->parent_task;
+			if ( !array_key_exists( $container , $result ) ) {
+				$result[ $container ] = array( );
+			}
+			array_push( $result[ $container ] , $task );
+		}
+		return $result;
+	}
+
+
 	public function getAllTasks( )
 	{
 		return $this->query(
@@ -326,4 +345,15 @@ class DAO_Tasks
 			->execute( $task->id , $sibling , $force ? 't' : 'f' );
 		return ( $result[0]->success == 't' );
 	}
+
+
+	public function moveTasks( $fromTask , $parentId , $toTask , $targetId , $tasks , $force )
+	{
+		$result = $this->query( 'SELECT tasks_move( $1 , $2 , $3 , $4 , $5 , $6::int[] ) AS error' )
+			->execute( $fromTask ? 't' : 'f' , $parentId ,
+				$toTask ? 't' : 'f' , $targetId ,
+				$force ? 't' : 'f' ,
+				'{' . join( ',' , $tasks ) . '}' );
+		return $result[0]->error;
+	}
 }

includes/t-tasks/controllers.inc.php

@@ -566,3 +566,125 @@ class Ctrl_TaskClaim
 	}
 
 }
+
+
+class Ctrl_TaskMove
+	extends Controller
+	implements FormAware
+{
+	private $form;
+
+	public function setForm( Form $form )
+	{
+		$this->form = $form;
+	}
+
+	public function handle( Page $page )
+	{
+		$type = $this->form->field( 'type' );
+		$id = $this->form->field( 'id' );
+		$target = $this->form->field( 'target' );
+		$tasks = $this->form->field( 'tasks[]' );
+
+		$tFull = $target->value( );
+		if ( strlen( $tFull ) < 2 ) {
+			$target->putError( 'Invalid target.' );
+			return null;
+		}
+		$toTask = ( substr( $tFull , 0 , 1 ) == 'T' );
+		$toId = (int) substr( $tFull , 1 );
+
+		$error = Loader::DAO( 'tasks' )->moveTasks(
+			$type->value( ) === 's' , (int) $id->value( ) ,
+			$toTask , $toId , $tasks->value( ) ,
+			false ); // FIXME: should be read from the form
+
+		switch ( $error ) {
+
+		case 0:
+			return true;
+
+		case 1:
+			$tasks->putError( 'Selected tasks deleted.' );
+			break;
+
+		case 2:
+			$tasks->putError( 'Selected tasks moved.' );
+			break;
+
+		case 3:
+			$target->putError( 'Target has been deleted.' );
+			break;
+
+		case 4:
+			$target->putError( 'This is a child of a selected task.' );
+			break;
+
+		case 5:
+			$tasks->putError( 'Dependencies would be broken (FIXME: force mode)' );
+			break;
+
+		default:
+			$target->putError( "An unknown error occurred ($error)" );
+			break;
+		}
+
+		return null;
+	}
+
+	private function addTopLevelTask( )
+	{
+		$item = $this->form->field( 'item' );
+		$name = $this->form->field( 'title' );
+		$priority = $this->form->field( 'priority' );
+		$description = $this->form->field( 'description' );
+
+		$error = Loader::DAO( 'tasks' )->addTask( (int) $item->value( ) , $name->value( ) ,
+			(int) $priority->value( ) , $description->value( ) );
+		switch ( $error ) {
+
+		case 0:
+			return true;
+
+		case 1:
+			$name->putError( 'Duplicate task name for this item.' );
+			break;
+
+		case 2:
+			$item->putError( 'This item has been deleted' );
+			break;
+
+		default:
+			$name->putError( "An unknown error occurred ($error)" );
+			break;
+		}
+
+		return null;
+	}
+
+	private function addNestedTask( )
+	{
+		$parent = $this->form->field( 'parent' );
+		$name = $this->form->field( 'title' );
+		$priority = $this->form->field( 'priority' );
+		$description = $this->form->field( 'description' );
+
+		$error = Loader::DAO( 'tasks' )->addNestedTask( (int) $parent->value( ) ,
+			$name->value( ) , (int) $priority->value( ) , $description->value( ) );
+		switch ( $error ) {
+
+		case 0:
+			return true;
+
+		case 1:
+			$name->putError( 'Duplicate sub-task name.' );
+			break;
+
+		default:
+			$name->putError( "An unknown error occurred ($error)" );
+			break;
+		}
+
+		return null;
+	}
+}

includes/t-tasks/package.inc.php

@@ -32,6 +32,7 @@ $package[ 'ctrls' ][] = 'task_details';
 $package[ 'ctrls' ][] = 'task_list_subtasks';
 $package[ 'ctrls' ][] = 'task_move_down';
 $package[ 'ctrls' ][] = 'task_move_up';
+$package[ 'ctrls' ][] = 'task_move_form';
 $package[ 'ctrls' ][] = 'task_move';
 $package[ 'ctrls' ][] = 'task_notes';
 $package[ 'ctrls' ][] = 'toggle_task';

includes/t-tasks/page_controllers.inc.php

@@ -788,7 +788,7 @@ class Ctrl_TaskMoveUp
 }
 
 
-class Ctrl_TaskMove
+class Ctrl_TaskMoveForm
 	extends Controller
 {
 
@@ -833,16 +833,62 @@ class Ctrl_TaskMove
 			return $failure;
 		}
 
-		// Generate form
+		// Form header
 		$page->setTitle( $name . ': move tasks' );
 		$form = Loader::Create( 'Form' , 'Move tasks' , 'move-tasks' )
+			->setURL( $failure )
+			->addController( Loader::Ctrl( 'task_move' ) )
 			->addField( Loader::Create( 'Field' , 'type' , 'hidden' )
 				->setDefaultValue( $subtasks ? 's' : 'i' ) )
 			->addField( Loader::Create( 'Field' , 'id' , 'hidden' )
-				->setDefaultValue( $id ) ) ;
-//		$this->addDependencySelector( $form , $task->possibleDependencies , $task->parent_task === null );
-		return $form->setURL( $failure )
-//			->addController( Loader::Ctrl( 'dependency_add' ) )
-			->controller( );
+				->setDefaultValue( $id ) );
+
+		// List of targets
+		$tSel = Loader::Create( 'Field' , 'target' , 'select' )
+			->setDescription( 'Move to:' )
+			->addOption( '' , '(please select a target)' );
+		$this->addTargets( $tSel , $subtasks , $id );
+		$form->addField( $tSel );
+
+		// List of tasks
+		$tSel = Loader::Create( 'Field' , 'tasks[]' , 'select' , array( 'multiple' ) )
+			->setDescription( 'Tasks to move:' );
+		foreach ( $tasks as $t ) {
+			$tSel->addOption( $t->id , $t->title );
 		}
+		$form->addField( $tSel );
+
+		return $form->controller( );
+	}
+
+
+	private function addTargets( Field $field , $isTask , $id )
+	{
+		$items = $this->dItems->getTreeList( );
+		$tasks = $this->dTasks->getActiveTasksAssoc( );
+
+		foreach ( $items as $item ) {
+			$title = str_repeat( '--' , $item->depth ) . ' ' . strtoupper( $item->name );
+			$disabled = !$isTask && $item->id == $id;
+			$iid = 'I' . $item->id;
+			$field->addOption( $iid , $title , $disabled );
+			$this->addTargetTasks( $field , $iid , $tasks , $isTask , $id , $item->depth + 1 );
+		}
+	}
+
+	private function addTargetTasks( Field $field , $iid , $tasks , $isTask , $id , $depth )
+	{
+		if ( !array_key_exists( $iid , $tasks ) ) {
+			return;
+		}
+
+		foreach ( $tasks[ $iid ] as $task ) {
+			$title = str_repeat( '--' , $depth ) . '> ' . $task->title;
+			$disabled = $isTask && $task->id == $id;
+			$tid = 'T' . $task->id;
+			$field->addOption( $tid , $title , $disabled );
+			$this->addTargetTasks( $field , $tid , $tasks , $isTask , $id , $depth + 1 );
+		}
+	}
+
 }

includes/t-tasks/pages.inc.php

@@ -17,7 +17,7 @@ class Page_TasksTasks
 			'view'		=> 'view_task' ,
 			'deps/add'	=> 'dependency_add_form' ,
 			'deps/delete'	=> 'dependency_delete_form' ,
-			'move'		=> 'task_move' ,
+			'move'		=> 'task_move_form' ,
 			'move/down'	=> 'task_move_down' ,
 			'move/up'	=> 'task_move_up' ,
 			'notes/edit'	=> 'edit_note_form' ,