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#!/usr/bin/env python

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# -*- coding: utf-8 -*-

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# This file is part of Beremiz, a Integrated Development Environment for

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# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.

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#

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# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD

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# Copyright (C) 2017: Andrey Skvortsov <andrej.skvortzov@gmail.com>

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#

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# See COPYING file for copyrights details.

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#

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# This program is free software; you can redistribute it and/or

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# modify it under the terms of the GNU General Public License

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# as published by the Free Software Foundation; either version 2

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# of the License, or (at your option) any later version.

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#

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# This program is distributed in the hope that it will be useful,

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# but WITHOUT ANY WARRANTY; without even the implied warranty of

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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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# GNU General Public License for more details.

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#

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# You should have received a copy of the GNU General Public License

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# along with this program; if not, write to the Free Software

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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

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import wx

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from graphics.GraphicCommons import CONTACT_NORMAL, CONTACT_REVERSE, \

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    CONTACT_RISING, CONTACT_FALLING, COIL_NORMAL, COIL_REVERSE, COIL_SET, \

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    COIL_RESET, COIL_RISING, COIL_FALLING

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from graphics.LD_Objects import LD_Contact, LD_Coil

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from BlockPreviewDialog import BlockPreviewDialog

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#-------------------------------------------------------------------------------

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#                       Set Ladder Element Parmeters Dialog

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#-------------------------------------------------------------------------------

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"""

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Class that implements a dialog for defining parameters of a LD contact or coil

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graphic element

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"""

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class LDElementDialog(BlockPreviewDialog):

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    def __init__(self, parent, controller, tagname, type):

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        """

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        Constructor

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        @param parent: Parent wx.Window of dialog for modal

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        @param controller: Reference to project controller

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        @param tagname: Tagname of project POU edited

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        @param type: Type of LD element ('contact or 'coil')

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        """

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        BlockPreviewDialog.__init__(self, parent, controller, tagname, 

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              title=(_("Edit Contact Values")

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                     if type == "contact"

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                     else _("Edit Coil Values")))

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        # Init common sizers

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        self._init_sizers(2, 0, 

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              (7 if type == "contact" else 9), None, 2, 1)

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        # Create label for LD element modifier

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        modifier_label = wx.StaticText(self, label=_('Modifier:'))

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        self.LeftGridSizer.AddWindow(modifier_label, border=5, 

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              flag=wx.GROW|wx.BOTTOM)

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        # Create radio buttons for selecting LD element modifier

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        self.ModifierRadioButtons = {}

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        first = True

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        element_modifiers = ([CONTACT_NORMAL, CONTACT_REVERSE, 

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                              CONTACT_RISING, CONTACT_FALLING]

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                             if type == "contact"

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                             else [COIL_NORMAL, COIL_REVERSE, COIL_SET,

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                                   COIL_RESET, COIL_RISING, COIL_FALLING])

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        modifiers_label = [_("Normal"), _("Negated")] + \

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                          ([_("Set"), _("Reset")] if type == "coil" else []) + \

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                          [_("Rising Edge"), _("Falling Edge")]

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        for modifier, label in zip(element_modifiers, modifiers_label):

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            radio_button = wx.RadioButton(self, label=label, 

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                  style=(wx.RB_GROUP if first else 0))

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            radio_button.SetValue(first)

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            self.Bind(wx.EVT_RADIOBUTTON, self.OnModifierChanged, radio_button)

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            self.LeftGridSizer.AddWindow(radio_button, flag=wx.GROW)

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            self.ModifierRadioButtons[modifier] = radio_button

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            first = False

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        # Create label for LD element variable

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        element_variable_label = wx.StaticText(self, label=_('Variable:'))

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        self.LeftGridSizer.AddWindow(element_variable_label, border=5,

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              flag=wx.GROW|wx.TOP)

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        # Create a combo box for defining LD element variable

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        self.ElementVariable = wx.ComboBox(self, style=wx.CB_SORT)

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        self.Bind(wx.EVT_COMBOBOX, self.OnVariableChanged, 

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                  self.ElementVariable)

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        self.Bind(wx.EVT_TEXT, self.OnVariableChanged, 

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                  self.ElementVariable)        

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        self.LeftGridSizer.AddWindow(self.ElementVariable, border=5,

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             flag=wx.GROW|wx.TOP)

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        # Add preview panel and associated label to sizers

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        self.RightGridSizer.AddWindow(self.PreviewLabel, flag=wx.GROW)

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        self.RightGridSizer.AddWindow(self.Preview, flag=wx.GROW)

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        # Add buttons sizer to sizers

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        self.MainSizer.AddSizer(self.ButtonSizer, border=20, 

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              flag=wx.ALIGN_RIGHT|wx.BOTTOM|wx.LEFT|wx.RIGHT)

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        # Save LD element class

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        self.ElementClass = (LD_Contact if type == "contact" else LD_Coil)

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        # Extract list of variables defined in POU

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        self.RefreshVariableList()

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        # Set values in ElementVariable

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        for name, (var_type, value_type) in self.VariableList.iteritems():

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            # Only select BOOL variable and avoid input for coil

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            if (type == "contact" or var_type != "Input") and \

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               value_type == "BOOL":

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                self.ElementVariable.Append(name)

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        self.Fit()

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        # Normal radio button is default control having keyboard focus

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        self.ModifierRadioButtons[element_modifiers[0]].SetFocus()

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    def GetElementModifier(self):

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        """

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        Return modifier selected for LD element

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        @return: Modifier selected (None if not found)

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        """

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        # Go through radio buttons and return modifier associated to the one

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        # that is selected

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        for modifier, control in self.ModifierRadioButtons.iteritems():

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            if control.GetValue():

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                return modifier

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        return None

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    def SetValues(self, values):

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        """

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        Set default LD element parameters

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        @param values: LD element parameters values

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        """

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        # For each parameters defined, set corresponding control value

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        for name, value in values.items():

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            # Parameter is LD element variable

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            if name == "variable":

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                self.ElementVariable.SetValue(value)

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            # Set value of other controls

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            elif name == "modifier":

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                self.ModifierRadioButtons[value].SetValue(True)

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        # Refresh preview panel

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        self.RefreshPreview()

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    def GetValues(self):

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        """

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        Return LD element parameters defined in dialog

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        @return: {parameter_name: parameter_value,...}

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        """

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        values = {

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            "variable": self.ElementVariable.GetValue(),

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            "modifier": self.GetElementModifier()}

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        values["width"], values["height"] = self.Element.GetSize()

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        return values

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    def OnModifierChanged(self, event):

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        """

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        Called when LD element modifier changed

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        @param event: wx.RadioButtonEvent

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        """

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        self.RefreshPreview()

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        event.Skip()

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    def OnVariableChanged(self, event):

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        """

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        Called when LD element associated variable changed

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        @param event: wx.ComboBoxEvent

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        """

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        self.RefreshPreview()

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        event.Skip()

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    def RefreshPreview(self):

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        """

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        Refresh preview panel of graphic element

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        Override BlockPreviewDialog function

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        """

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        value = self.ElementVariable.GetValue()

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        # Set graphic element displayed, creating a LD element

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        self.Element = self.ElementClass(

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                self.Preview, 

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                self.GetElementModifier(),

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                value)

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        button = self.ButtonSizer.GetAffirmativeButton()

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        button.Enable(value != "")

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        # Call BlockPreviewDialog function

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        BlockPreviewDialog.RefreshPreview(self)

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    def OnOK(self, event):

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        if self.ElementVariable.GetValue() != "":

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            self.EndModal(wx.ID_OK)

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