#------------------------------------------------------------------------------
#
#  Copyright (c) 2005, Enthought, Inc.
#  All rights reserved.
#
#  This software is provided without warranty under the terms of the BSD
#  license included in enthought/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!
#
#  Author: David C. Morrill
#  Date:   10/21/2004
#
#------------------------------------------------------------------------------

""" Defines the various editors for multi-selection enumerations, for the
wxPython user interface toolkit.
"""

#-------------------------------------------------------------------------
#  Imports:
#-------------------------------------------------------------------------

import logging

import wx

from traits.api \
    import List, Str, TraitError

# FIXME: ToolkitEditorFactory is a proxy class defined here just for backward
# compatibility. The class has been moved to the
# traitsui.editors.check_list_editor file.
from traitsui.editors.check_list_editor \
    import ToolkitEditorFactory

from .editor_factory \
    import TextEditor as BaseTextEditor

from .editor \
    import EditorWithList

from .helper \
    import TraitsUIPanel
from functools import reduce

logger = logging.getLogger(__name__)


# default formatting function (would import from string, but not in Python 3)
capitalize = lambda s: s.capitalize()


#-------------------------------------------------------------------------
#  'SimpleEditor' class:
#-------------------------------------------------------------------------

class SimpleEditor(EditorWithList):
    """ Simple style of editor for checklists, which displays a combo box.
    """

    #-------------------------------------------------------------------------
    #  Trait definitions:
    #-------------------------------------------------------------------------

    # Checklist item names
    names = List(Str)

    # Checklist item values
    values = List

    #-------------------------------------------------------------------------
    #  Finishes initializing the editor by creating the underlying toolkit
    #  widget:
    #-------------------------------------------------------------------------

    def init(self, parent):
        """ Finishes initializing the editor by creating the underlying toolkit
            widget.
        """
        self.create_control(parent)
        super(SimpleEditor, self).init(parent)
        self.set_tooltip()

    #-------------------------------------------------------------------------
    #  Creates the initial editor control:
    #-------------------------------------------------------------------------

    def create_control(self, parent):
        """ Creates the initial editor control.
        """
        self.control = wx.Choice(parent, -1,
                                 wx.Point(0, 0), wx.Size(100, 20), [])
        wx.EVT_CHOICE(parent, self.control.GetId(), self.update_object)

    #-------------------------------------------------------------------------
    #  Handles the list of legal check list values being updated:
    #-------------------------------------------------------------------------

    def list_updated(self, values):
        """ Handles updates to the list of legal checklist values.
        """
        sv = self.string_value
        if (len(values) > 0) and isinstance(values[0], str):
            values = [(x, sv(x, capitalize)) for x in values]
        self.values = valid_values = [x[0] for x in values]
        self.names = [x[1] for x in values]

        # Make sure the current value is still legal:
        modified = False
        cur_value = parse_value(self.value)
        for i in range(len(cur_value) - 1, -1, -1):
            if cur_value[i] not in valid_values:
                try:
                    del cur_value[i]
                    modified = True
                except TypeError as e:
                    logger.warn('Unable to remove non-current value [%s] from '
                                'values %s', cur_value[i], values)
        if modified:
            if isinstance(self.value, str):
                cur_value = ','.join(cur_value)
            self.value = cur_value

        self.rebuild_editor()

    #-------------------------------------------------------------------------
    #  Rebuilds the editor after its definition is modified:
    #-------------------------------------------------------------------------

    def rebuild_editor(self):
        """ Rebuilds the editor after its definition is modified.
        """
        control = self.control
        control.Clear()
        for name in self.names:
            control.Append(name)

        self.update_editor()

    #-------------------------------------------------------------------------
    #  Handles the user selecting a new value from the combo box:
    #-------------------------------------------------------------------------

    def update_object(self, event):
        """ Handles the user selecting a new value from the combo box.
        """
        value = self.values[self.names.index(event.GetString())]
        if not isinstance(self.value, str):
            value = [value]

        self.value = value

    #-------------------------------------------------------------------------
    #  Updates the editor when the object trait changes external to the editor:
    #-------------------------------------------------------------------------

    def update_editor(self):
        """ Updates the editor when the object trait changes externally to the
            editor.
        """
        try:
            self.control.SetSelection(
                self.values.index(parse_value(self.value)[0]))
        except:
            pass

#-------------------------------------------------------------------------
#  'CustomEditor' class:
#-------------------------------------------------------------------------


class CustomEditor(SimpleEditor):
    """ Custom style of editor for checklists, which displays a set of check
        boxes.
    """

    #-------------------------------------------------------------------------
    #  Creates the initial editor control:
    #-------------------------------------------------------------------------

    def create_control(self, parent):
        """ Creates the initial editor control.
        """
        # Create a panel to hold all of the check boxes
        self.control = panel = TraitsUIPanel(parent, -1)

    #-------------------------------------------------------------------------
    #  Rebuilds the editor after its definition is modified:
    #-------------------------------------------------------------------------

    def rebuild_editor(self):
        """ Rebuilds the editor after its definition is modified.
        """
        panel = self.control
        panel.SetSizer(None)
        panel.DestroyChildren()

        cur_value = parse_value(self.value)

        # Create a sizer to manage the radio buttons:
        labels = self.names
        values = self.values
        n = len(labels)
        cols = self.factory.cols
        rows = (n + cols - 1) / cols
        incr = [n / cols] * cols
        rem = n % cols

        for i in range(cols):
            incr[i] += (rem > i)
        incr[-1] = -(reduce(lambda x, y: x + y, incr[:-1], 0) - 1)

        if cols > 1:
            sizer = wx.GridSizer(0, cols, 2, 4)
        else:
            sizer = wx.BoxSizer(wx.VERTICAL)

        # Add the set of all possible choices:
        index = 0
        for i in range(rows):
            for j in range(cols):
                if n > 0:
                    label = labels[index]
                    control = wx.CheckBox(panel, -1, label)
                    control.value = value = values[index]
                    control.SetValue(value in cur_value)
                    wx.EVT_CHECKBOX(panel, control.GetId(), self.update_object)
                    index += incr[j]
                    n -= 1
                else:
                    control = wx.CheckBox(panel, -1, '')
                    control.Show(False)

                sizer.Add(control, 0, wx.NORTH, 5)

        # Lay out the controls:
        panel.SetSizerAndFit(sizer)

        # FIXME: There are cases where one of the parent panel's of the check
        # list editor has a fixed 'min size' which prevents the check list
        # editor from expanding correctly, so we currently are making sure
        # that all of the parent panels do not have a fixed min size before
        # doing the layout/refresh:
        parent = panel.GetParent()
        while isinstance(parent, wx.Panel):
            parent.SetMinSize(wx.Size(-1, -1))
            panel = parent
            parent = parent.GetParent()

        panel.Layout()
        panel.Refresh()

    #-------------------------------------------------------------------------
    #  Handles the user clicking one of the 'custom' check boxes:
    #-------------------------------------------------------------------------

    def update_object(self, event):
        """ Handles the user clicking one of the custom check boxes.
        """
        control = event.GetEventObject()
        cur_value = parse_value(self.value)
        if control.GetValue():
            cur_value.append(control.value)
        else:
            cur_value.remove(control.value)
        if isinstance(self.value, str):
            cur_value = ','.join(cur_value)
        self.value = cur_value

    #-------------------------------------------------------------------------
    #  Updates the editor when the object trait changes external to the editor:
    #-------------------------------------------------------------------------

    def update_editor(self):
        """ Updates the editor when the object trait changes externally to the
            editor.
        """
        new_values = parse_value(self.value)
        for control in self.control.GetChildren():
            if control.IsShown():
                control.SetValue(control.value in new_values)

#-------------------------------------------------------------------------
#  'TextEditor' class:
#-------------------------------------------------------------------------


class TextEditor(BaseTextEditor):
    """ Text style of editor for checklists, which displays a text field.
    """

    #-------------------------------------------------------------------------
    #  Handles the user changing the contents of the edit control:
    #-------------------------------------------------------------------------

    def update_object(self, event):
        """ Handles the user changing the contents of the edit control.
        """
        try:
            value = self.control.GetValue()
            value = eval(value)
        except:
            pass
        try:
            self.value = value
        except TraitError as excp:
            pass

#-------------------------------------------------------------------------
#  Parse a value into a list:
#-------------------------------------------------------------------------


def parse_value(value):
    """ Parses a value into a list.
    """
    if value is None:
        return []

    if not isinstance(value, str):
        return value[:]

    return [x.strip() for x in value.split(',')]

### EOF ##################################################################
