"""
Similar to the opengl_widget module, this module defines
helper functions for the point_list_widget. It is named
the same for convenience. The actual point_list_widget
is defined in the clusterview_ui.py file.
"""

from clusterview2.point_manager import PointManager


def _string_point_to_point(str_point):
    """
    In the QListWidget points are stored as strings
    because of the way Qt has list items defined.

    @param str_point The string of the form (x, y) to convert.
    """

    # 1. Split
    elems = str_point.split(",")

    # 2. Take elements "(x" and "y)" and remove their first and
    #    last characters, respectively. Note that for y this
    #    function expects there to be a space after the comma.
    x = elems[0][1:]
    y = elems[1][1:-1]

    return (int(x), int(y))


def item_click_handler(ctx, item):
    """
    Handles an item becoming clicked in the list.

    This function is designed to be partially applied with the
    main_window context in order to be able to trigger an opengl_widget
    refresh.

    @param ctx The context.
    @param item The clicked item.
    """
    point = _string_point_to_point(item.text())

    # TODO: Super slow linear search, should write a find_point function
    #       on the point_set in order to speed this up since PointSet
    #       is backed by a set anyway.
    for p in PointManager.point_set.points:
        if p.x == point[0] and p.y == point[1]:
            p.select()
        else:
            p.unselect()

    ctx.opengl_widget.update()