#!/usr/bin/env python
# -*- coding: utf-8 -*-

# This file is part of Beremiz, a Integrated Development Environment for
# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.
#
# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
# Copyright (C) 2017: Andrey Skvortsov <andrej.skvortzov@gmail.com>
#
# See COPYING file for copyrights details.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.


from __future__ import absolute_import
import wx

from graphics.GraphicCommons import CONNECTOR, CONTINUATION
from graphics.FBD_Objects import FBD_Connector
from dialogs.BlockPreviewDialog import BlockPreviewDialog

# -------------------------------------------------------------------------------
#                       Set Connection Parameters Dialog
# -------------------------------------------------------------------------------


class ConnectionDialog(BlockPreviewDialog):
    """
    Class that implements a dialog for defining parameters of a connection graphic
    element
    """

    def __init__(self, parent, controller, tagname, apply_button=False):
        """
        Constructor
        @param parent: Parent wx.Window of dialog for modal
        @param controller: Reference to project controller
        @param tagname: Tagname of project POU edited
        @param apply_button: Enable button for applying connector modification
        to all connector having the same name in POU (default: False)
        """
        BlockPreviewDialog.__init__(self, parent, controller, tagname,
                                    title=_('Connection Properties'))

        # Init common sizers
        self._init_sizers(2, 0, 7, 1, 0, None)

        # Create label for connection type
        type_label = wx.StaticText(self, label=_('Type:'))
        self.LeftGridSizer.AddWindow(type_label, flag=wx.GROW)

        # Create radio buttons for selecting connection type
        self.TypeRadioButtons = {}
        first = True
        for type, label in [(CONNECTOR, _('Connector')),
                            (CONTINUATION, _('Continuation'))]:
            radio_button = wx.RadioButton(self, label=label,
                                          style=(wx.RB_GROUP if first else 0))
            radio_button.SetValue(first)
            self.Bind(wx.EVT_RADIOBUTTON, self.OnTypeChanged, radio_button)
            self.LeftGridSizer.AddWindow(radio_button, flag=wx.GROW)
            self.TypeRadioButtons[type] = radio_button
            first = False

        # Create label for connection name
        name_label = wx.StaticText(self, label=_('Name:'))
        self.LeftGridSizer.AddWindow(name_label, flag=wx.GROW)

        # Create text control for defining connection name
        self.ConnectionName = wx.TextCtrl(self)
        self.ConnectionName.SetMinSize(wx.Size(200, -1))
        self.Bind(wx.EVT_TEXT, self.OnNameChanged, self.ConnectionName)
        self.LeftGridSizer.AddWindow(self.ConnectionName, flag=wx.GROW)

        # Add preview panel and associated label to sizers
        self.Preview.SetMinSize(wx.Size(-1, 100))
        self.LeftGridSizer.AddWindow(self.PreviewLabel, flag=wx.GROW)
        self.LeftGridSizer.AddWindow(self.Preview, flag=wx.GROW)

        # Add buttons sizer to sizers
        self.MainSizer.AddSizer(
            self.ButtonSizer, border=20,
            flag=wx.ALIGN_RIGHT | wx.BOTTOM | wx.LEFT | wx.RIGHT)
        self.ColumnSizer.RemoveSizer(self.RightGridSizer)

        # Add button for applying connection name modification to all connection
        # of POU
        if apply_button:
            self.ApplyToAllButton = wx.Button(self, label=_("Propagate Name"))
            self.ApplyToAllButton.SetToolTipString(
                _("Apply name modification to all continuations with the same name"))
            self.Bind(wx.EVT_BUTTON, self.OnApplyToAll, self.ApplyToAllButton)
            self.ButtonSizer.AddWindow(self.ApplyToAllButton, flag=wx.LEFT)
        else:
            self.ConnectionName.ChangeValue(
                controller.GenerateNewName(
                    tagname, None, "Connection%d", 0))
        self.Fit()

        # Connector radio button is default control having keyboard focus
        self.TypeRadioButtons[CONNECTOR].SetFocus()

    def GetConnectionType(self):
        """
        Return type selected for connection
        @return: Type selected (CONNECTOR or CONTINUATION)
        """
        return (CONNECTOR
                if self.TypeRadioButtons[CONNECTOR].GetValue()
                else CONTINUATION)

    def SetValues(self, values):
        """
        Set default connection parameters
        @param values: Connection parameters values
        """
        # For each parameters defined, set corresponding control value
        for name, value in values.items():

            # Parameter is connection type
            if name == "type":
                self.TypeRadioButtons[value].SetValue(True)

            # Parameter is connection name
            elif name == "name":
                self.ConnectionName.SetValue(value)

        # Refresh preview panel
        self.RefreshPreview()

    def GetValues(self):
        """
        Return connection parameters defined in dialog
        @return: {parameter_name: parameter_value,...}
        """
        values = {
            "type": self.GetConnectionType(),
            "name": self.ConnectionName.GetValue()}
        values["width"], values["height"] = self.Element.GetSize()
        return values

    def TestConnectionName(self):
        """
        Test that connection name is valid
        @return: True if connection name is valid
        """
        message = None

        # Get connection name typed by user
        connection_name = self.ConnectionName.GetValue()

        # Test that a name have been defined
        if connection_name == "":
            message = _("Form isn't complete. Name must be filled!")

        # If an error have been identify, show error message dialog
        if message is not None:
            self.ShowErrorMessage(message)
            # Test failed
            return False

        # Return result of element name test
        return self.TestElementName(connection_name)

    def OnOK(self, event):
        """
        Called when dialog OK button is pressed
        Test if connection name is valid
        @param event: wx.Event from OK button
        """
        # Close dialog if connection name is valid
        if self.TestConnectionName():
            self.EndModal(wx.ID_OK)

    def OnApplyToAll(self, event):
        """
        Called when Apply To All button is pressed
        Test if connection name is valid
        @param event: wx.Event from OK button
        """
        # Close dialog if connection name is valid
        if self.TestConnectionName():
            self.EndModal(wx.ID_YESTOALL)

    def OnTypeChanged(self, event):
        """
        Called when connection type changed
        @param event: wx.RadioButtonEvent
        """
        self.RefreshPreview()
        event.Skip()

    def OnNameChanged(self, event):
        """
        Called when connection name value changed
        @param event: wx.TextEvent
        """
        self.RefreshPreview()
        event.Skip()

    def RefreshPreview(self):
        """
        Refresh preview panel of graphic element
        Override BlockPreviewDialog function
        """
        # Set graphic element displayed, creating a FBD connection element
        self.Element = FBD_Connector(self.Preview,
                                     self.GetConnectionType(),
                                     self.ConnectionName.GetValue())

        # Call BlockPreviewDialog function
        BlockPreviewDialog.RefreshPreview(self)