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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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from __future__ import absolute_import

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import wx

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from graphics.SFC_Objects import SFC_Step

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from dialogs.BlockPreviewDialog import BlockPreviewDialog

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

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#                         Set SFC Step Parameters Dialog

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

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class SFCStepDialog(BlockPreviewDialog):

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    """

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    Class that implements a dialog for defining parameters of a SFC step graphic

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    element

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    """

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    def __init__(self, parent, controller, tagname, initial=False):

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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 initial: True if step is initial (default: False)

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        """

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

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                                    title=_('Edit Step'))

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        # Init common sizers

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        self._init_sizers(2, 0, 6, None, 2, 1)

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        # Create label for SFC step name

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        name_label = wx.StaticText(self, label=_('Name:'))

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

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        # Create text control for defining SFC step name

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        self.StepName = wx.TextCtrl(self)

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        self.Bind(wx.EVT_TEXT, self.OnNameChanged, self.StepName)

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

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        # Create label for SFC step connectors

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        connectors_label = wx.StaticText(self, label=_('Connectors:'))

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

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        # Create check boxes for defining connectors available on SFC step

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        self.ConnectorsCheckBox = {}

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        for name, label in [("input", _("Input")),

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                            ("output", _("Output")),

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                            ("action", _("Action"))]:

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            check_box = wx.CheckBox(self, label=label)

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            if name == "output" or (name == "input" and not initial):

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                check_box.SetValue(True)

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            self.Bind(wx.EVT_CHECKBOX, self.OnConnectorsChanged, check_box)

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

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            self.ConnectorsCheckBox[name] = check_box

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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(

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            self.ButtonSizer, border=20,

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

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        # Save flag that indicates that step is initial

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        self.Initial = initial

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        # Set default name for step

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        self.StepName.ChangeValue(controller.GenerateNewName(

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               tagname, None, "Step%d", 0))

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        self.Fit()

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        # Step name text control is default control having keyboard focus

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        self.StepName.SetFocus()

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    def SetValues(self, values):

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        """

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        Set default block parameters

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        @param values: Block 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 step name

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            if name == "name":

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                self.StepName.ChangeValue(value)

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            # Set value of other controls

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            else:

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                control = self.ConnectorsCheckBox.get(name, None)

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                if control is not None:

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                    control.SetValue(value)

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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 step parameters defined in dialog

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

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        """

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        values = {"name": self.StepName.GetValue()}

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        values.update({

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            name: control.IsChecked()

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            for name, control in self.ConnectorsCheckBox.iteritems()})

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

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        return values

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    def OnOK(self, event):

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        """

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        Called when dialog OK button is pressed

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        Test if step name defined is valid

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        @param event: wx.Event from OK button

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        """

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        message = None

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        # Get step name typed by user

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        step_name = self.StepName.GetValue()

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        # Test that a name have been defined

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        if step_name == "":

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            message = _("Form isn't complete. Name must be filled!")

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        # If an error have been identify, show error message dialog

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        if message is not None:

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            self.ShowErrorMessage(message)

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        # Test step name validity

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        elif self.TestElementName(step_name):

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            # Call BlockPreviewDialog function

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            BlockPreviewDialog.OnOK(self, event)

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    def OnConnectorsChanged(self, event):

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        """

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        Called when a step connector value changed

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        @param event: wx.CheckBoxEvent

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        """

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        self.RefreshPreview()

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        event.Skip()

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    def OnNameChanged(self, event):

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        """

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        Called when step name value changed

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        @param event: wx.TextEvent

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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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        # Set graphic element displayed, creating a SFC step element

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        self.Element = SFC_Step(self.Preview,

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                                self.StepName.GetValue(),

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                                self.Initial)

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        # Update connectors of SFC step element according to check boxes value

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        for name, control in self.ConnectorsCheckBox.iteritems():

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            if control.IsChecked():

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                getattr(self.Element, "Add" + name.capitalize())()

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            else:

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                getattr(self.Element, "Remove" + name.capitalize())()

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        # Call BlockPreviewDialog function

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        BlockPreviewDialog.RefreshPreview(self)