"""Incremental demo for wx support of tasks.

Multiple tasks

Note that naively subclassing SecondTask from ExampleTask, it initially used
the same menu_bar and tool_bars traits from ExampleTask.  This caused the
incorrect tying of the controls to SecondTask because the class attributes
were shared between both classes.
"""

from pyface.action.schema.api import SMenu, SMenuBar, SToolBar
from pyface.api import (
    GUI,
    ConfirmationDialog,
    FileDialog,
    ImageResource,
    YES,
    OK,
    CANCEL,
)
from pyface.tasks.api import (
    Task,
    TaskWindow,
    TaskLayout,
    PaneItem,
    IEditor,
    IEditorAreaPane,
    EditorAreaPane,
    Editor,
    DockPane,
)
from pyface.tasks.action.api import (
    DockPaneToggleGroup,
    TaskAction,
    TaskToggleGroup,
)
from traits.api import Property, Instance


class ExamplePane(DockPane):
    """ A simple file browser pane.
    """

    # TaskPane interface ---------------------------------------------------

    id = "steps.example_pane"
    name = "Example Pane"


class ExampleTask(Task):
    """ A simple task for opening a blank editor.
    """

    # Task interface -------------------------------------------------------

    id = "example.example_task"
    name = "Multi-Tab Editor"

    active_editor = Property(
        Instance(IEditor), observe="editor_area.active_editor"
    )

    editor_area = Instance(IEditorAreaPane)

    menu_bar = SMenuBar(
        SMenu(
            TaskAction(name="New", method="new", accelerator="Ctrl+N"),
            id="File",
            name="&File",
        ),
        SMenu(
            DockPaneToggleGroup(), TaskToggleGroup(), id="View", name="&View"
        ),
    )

    tool_bars = [
        SToolBar(
            TaskAction(
                method="new",
                tooltip="New file",
                image=ImageResource("document_new"),
            ),
            image_size=(32, 32),
        )
    ]

    # ------------------------------------------------------------------------
    # 'Task' interface.
    # ------------------------------------------------------------------------

    def _default_layout_default(self):
        return TaskLayout(top=PaneItem("steps.example_pane"))

    def create_central_pane(self):
        """ Create the central pane: the script editor.
        """
        self.editor_area = EditorAreaPane()
        return self.editor_area

    def create_dock_panes(self):
        """ Create the file browser and connect to its double click event.
        """
        pane = ExamplePane()
        return [pane]

    # ------------------------------------------------------------------------
    # 'ExampleTask' interface.
    # ------------------------------------------------------------------------

    def new(self):
        """ Opens a new empty window
        """
        editor = Editor()
        self.editor_area.add_editor(editor)
        self.editor_area.activate_editor(editor)
        self.activated()

    # Trait property getter/setters ----------------------------------------

    def _get_active_editor(self):
        if self.editor_area is not None:
            return self.editor_area.active_editor
        return None


class SecondTask(ExampleTask):
    """ A simple task for opening a blank editor.
    """

    # Task interface -------------------------------------------------------

    id = "example.second_task"
    name = "Second Multi-Tab Editor"

    menu_bar = SMenuBar(
        SMenu(
            TaskAction(name="New", method="new", accelerator="Ctrl+N"),
            id="File",
            name="&File",
        ),
        SMenu(
            DockPaneToggleGroup(), TaskToggleGroup(), id="View", name="&View"
        ),
    )

    tool_bars = [
        SToolBar(
            TaskAction(
                method="new",
                tooltip="New file",
                image=ImageResource("document_new"),
            ),
            image_size=(32, 32),
        )
    ]

    # ------------------------------------------------------------------------
    # 'Task' interface.
    # ------------------------------------------------------------------------

    def _default_layout_default(self):
        return TaskLayout(bottom=PaneItem("steps.example_pane"))


def main(argv):
    """ A simple example of using Tasks.
    """
    # Create the GUI (this does NOT start the GUI event loop).
    gui = GUI()

    # Create a Task and add it to a TaskWindow.
    task1 = ExampleTask()
    task2 = SecondTask()
    window = TaskWindow(size=(800, 600))
    window.add_task(task1)
    window.add_task(task2)

    # Show the window.
    window.open()

    # Start the GUI event loop.
    gui.start_event_loop()


if __name__ == "__main__":
    import sys

    main(sys.argv)