# (C) Copyright 2004-2021 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!

"""
Defining column-specific context menu in a Table

Shows a TableEditor which has column-specific context menus.

The demo is a simple baseball scoring system, which lists each player and
their current batting statistics. After a given player has an at bat, you
right-click on the table cell corresponding to the player and the result of
the at-bat (e.g. 'S' = single) and select the 'Add' menu option to register
that the player hit a single and update the player's overall statistics.

This demo also illustrates the use of Property traits, and how using 'event'
meta-data can simplify event handling by collapsing an event that can
occur on a number of traits into a category of event, which can be handled by
a single event handler defined for the category (in this case, the category
is 'affects_average').
"""

from random import randint
from traits.api import HasStrictTraits, Str, Int, Float, List, Property
from traitsui.api import Action, Item, Menu, ObjectColumn, TableEditor, View


# Define a custom table column for handling items which affect the player's
# batting average:
class AffectsAverageColumn(ObjectColumn):

    # Define the context menu for the column:
    menu = Menu(Action(name='Add', action='column.add(object)'),
                Action(name='Sub', action='column.sub(object)'))

    # Right-align numeric values (override):
    horizontal_alignment = 'center'

    # Column width (override):
    width = 0.09

    # Don't allow the data to be edited directly:
    editable = False

    # Action methods for the context menu items:

    def add(self, object):
        """ Increment the affected player statistic.
        """
        setattr(object, self.name, getattr(object, self.name) + 1)

    def sub(self, object):
        """ Decrement the affected player statistic.
        """
        setattr(object, self.name, getattr(object, self.name) - 1)


# The 'players' trait table editor:
player_editor = TableEditor(
    editable=True,
    sortable=False,
    auto_size=False,
    columns=[
        ObjectColumn(name='name', editable=False, width=0.28),
        AffectsAverageColumn(name='at_bats', label='AB'),
        AffectsAverageColumn(name='strike_outs', label='SO'),
        AffectsAverageColumn(name='singles', label='S'),
        AffectsAverageColumn(name='doubles', label='D'),
        AffectsAverageColumn(name='triples', label='T'),
        AffectsAverageColumn(name='home_runs', label='HR'),
        AffectsAverageColumn(name='walks', label='W'),
        ObjectColumn(
            name='average',
            label='Ave',
            editable=False,
            width=0.09,
            horizontal_alignment='center',
            format='%0.3f'
        )
    ]
)


# 'Player' class:
class Player(HasStrictTraits):

    # Trait definitions:
    name = Str()
    at_bats = Int()
    strike_outs = Int(event='affects_average')
    singles = Int(event='affects_average')
    doubles = Int(event='affects_average')
    triples = Int(event='affects_average')
    home_runs = Int(event='affects_average')
    walks = Int()
    average = Property(Float)

    def _get_average(self):
        """ Computes the player's batting average from the current statistics.
        """
        if self.at_bats == 0:
            return 0.0

        return float(self.singles + self.doubles +
                     self.triples + self.home_runs) / self.at_bats

    def _affects_average_changed(self):
        """ Handles an event that affects the player's batting average.
        """
        self.at_bats += 1


class Team(HasStrictTraits):

    # Trait definitions:
    players = List(Player)

    # Trait view definitions:
    traits_view = View(
        Item('players', show_label=False, editor=player_editor),
        title='Baseball Scoring Demo',
        width=0.5,
        height=0.5,
        resizable=True
    )


def random_player(name):
    """ Generates and returns a random player.
    """
    p = Player(
        name=name,
        strike_outs=randint(0, 50),
        singles=randint(0, 50),
        doubles=randint(0, 20),
        triples=randint(0, 5),
        home_runs=randint(0, 30),
        walks=randint(0, 50)
    )
    return p.trait_set(
        at_bats=(
            p.strike_outs + p.singles + p.doubles + p.triples + p.home_runs +
            randint(100, 200)
        )
    )


# Create the demo:
demo = Team(
    players=[
        random_player(name) for name in [
            'Dave', 'Mike', 'Joe', 'Tom', 'Dick', 'Harry', 'Dirk', 'Fields',
            'Stretch'
        ]
    ]
)

# Run the demo (if invoked from the command line):
if __name__ == '__main__':
    demo.configure_traits()
