from .mode import Mode
from .opengl_widget import set_drawing_event

def __handle_add_point(ctx, event):
    """
    Event handler for the add point mode.

    Sets the drawing mode for the OpenGL Widget using
    `set_drawing_mode`, converts a point to our point
    representation, and adds it to the list.
    """
    print("[ADD] GOT POINT: ({}, {})".format(event.x(), event.y()))

    set_drawing_event(event)
    ctx.update()
    # Convert to our point representation and add to list widget
    # Point representation is a class called Point with coordinates,
    # and attributes (currently always None)

def __handle_edit_point(ctx, event):
    # TODO: This function and delete definitely need to make sure they are
    #       on a point we have.
    #
    # Since points are unique consider a hashmap of points to make O(1)
    # lookups for addition and deletion. This list can be maintained here
    # in this module. It should be a dictionary - from point to
    # attributes in the case of algorithms that require points to have
    # weights or something.
    #
    # Should move the associated point in the list to the new location if
    # applicable.
    print("[EDIT] GOT POINT: ({}, {})".format(event.x(), event.y()))

    # Store old x, y from event
    set_drawing_event(event)
    ctx.update()
    # after this remove the point from the list

def __handle_move_points(ctx, event):
    # TODO: Should move the associated points in the list to the new location.
    print("[MOVE] Pressed - NOTE NEED DRAG EVENT")
    # Store list of old points that are captured

    set_drawing_event(event)

    # Find and move all points from the old list to their new locations

def __handle_delete_point(ctx, event):
    print("[DELETE] GOT POINT: ({}, {})".format(event.x(), event.y()))

    set_drawing_event(event)

    # Find the point from event and remove it from the list

# Simple dispatcher to make it easy to dispatch the right mode
# function when the OpenGL window is clicked.
MODE_HANDLER_MAP = {
    Mode.OFF: lambda: None,
    Mode.ADD: __handle_add_point,
    Mode.EDIT: __handle_edit_point,
    Mode.MOVE: __handle_move_points,
    Mode.DELETE: __handle_delete_point
}