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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) 2013: 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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from __future__ import division

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import wx

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from plcopen.structures import TestIdentifier, IEC_KEYWORDS

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from graphics.GraphicCommons import FREEDRAWING_MODE

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

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#                    Dialog with preview for graphic block

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

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class BlockPreviewDialog(wx.Dialog):

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    """

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    Class that implements a generic dialog containing a preview panel for displaying

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    graphic created by dialog

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    """

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

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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 title: Title of dialog frame

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        """

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        wx.Dialog.__init__(self, parent, title=title)

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        # Save reference to

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        self.Controller = controller

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        self.TagName = tagname

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        # Label for preview

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        self.PreviewLabel = wx.StaticText(self, label=_('Preview:'))

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        # Create Preview panel

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        self.Preview = wx.Panel(self, style=wx.SIMPLE_BORDER)

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        self.Preview.SetBackgroundColour(wx.WHITE)

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        # Add function to preview panel so that it answers to graphic elements

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        # like Viewer

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        setattr(self.Preview, "GetDrawingMode", lambda: FREEDRAWING_MODE)

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        setattr(self.Preview, "GetScaling", lambda: None)

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        setattr(self.Preview, "GetBlockType", controller.GetBlockType)

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        setattr(self.Preview, "IsOfType", controller.IsOfType)

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        # Bind paint event on Preview panel

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        self.Preview.Bind(wx.EVT_PAINT, self.OnPaint)

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        # Add default dialog buttons sizer

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        self.ButtonSizer = self.CreateButtonSizer(wx.OK | wx.CANCEL | wx.CENTRE)

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        self.Bind(wx.EVT_BUTTON, self.OnOK, id=self.GetAffirmativeId())

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        self.Element = None            # Graphic element to display in preview

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        self.MinElementSize = None     # Graphic element minimal size

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        # Variable containing the graphic element name when dialog is opened

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        self.DefaultElementName = None

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        self.Fit()

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        # List of variables defined in POU {var_name: (var_class, var_type),...}

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        self.VariableList = {}

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    def __del__(self):

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        """

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        Destructor

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        """

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        # Remove reference to project controller

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        self.Controller = None

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    def _init_sizers(self,

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                     main_rows, main_growable_row,

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                     left_rows, left_growable_row,

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                     right_rows, right_growable_row):

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        """

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        Initialize common sizers

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        @param main_rows: Number of rows in main sizer

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        @param main_growable_row: Row that is growable in main sizer, None if no

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        row is growable

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        @param left_rows: Number of rows in left grid sizer

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        @param left_growable_row: Row that is growable in left grid sizer, None

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        if no row is growable

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        @param right_rows: Number of rows in right grid sizer

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        @param right_growable_row: Row that is growable in right grid sizer,

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        None if no row is growable

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        """

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        # Create dialog main sizer

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        self.MainSizer = wx.FlexGridSizer(cols=1, hgap=0,

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                                          rows=main_rows, vgap=10)

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        self.MainSizer.AddGrowableCol(0)

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        if main_growable_row is not None:

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            self.MainSizer.AddGrowableRow(main_growable_row)

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        # Create a sizer for dividing parameters in two columns

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        self.ColumnSizer = wx.BoxSizer(wx.HORIZONTAL)

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        self.MainSizer.Add(self.ColumnSizer, border=20,

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                                flag=wx.GROW | wx.TOP | wx.LEFT | wx.RIGHT)

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        # Create a sizer for left column

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        self.LeftGridSizer = wx.FlexGridSizer(cols=1, hgap=0,

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                                              rows=left_rows, vgap=5)

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        self.LeftGridSizer.AddGrowableCol(0)

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        if left_growable_row is not None:

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            self.LeftGridSizer.AddGrowableRow(left_growable_row)

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        self.ColumnSizer.Add(self.LeftGridSizer, 1, border=5,

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                                  flag=wx.GROW | wx.RIGHT | wx.EXPAND)

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        # Create a sizer for right column

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        self.RightGridSizer = wx.FlexGridSizer(cols=1, hgap=0,

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                                               rows=right_rows, vgap=0)

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        self.RightGridSizer.AddGrowableCol(0)

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        if right_growable_row is not None:

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            self.RightGridSizer.AddGrowableRow(right_growable_row)

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        self.ColumnSizer.Add(self.RightGridSizer, 1, border=5,

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                                  flag=wx.GROW | wx.LEFT)

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        self.SetSizer(self.MainSizer)

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    def SetMinElementSize(self, size):

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        """

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        Define minimal graphic element size

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        @param size: Tuple containing minimal size (width, height)

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        """

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        self.MinElementSize = size

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    def GetMinElementSize(self):

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        """

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        Get minimal graphic element size

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        @return: Tuple containing minimal size (width, height) or None if no

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        element defined

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        May be overridden by inherited classes

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        """

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        if self.Element is None:

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            return None

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        return self.Element.GetMinSize()

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    def SetPreviewFont(self, font):

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        """

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        Set font of Preview panel

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        @param font: wx.Font object containing font style

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        """

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        self.Preview.SetFont(font)

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    def RefreshVariableList(self):

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        """

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        Extract list of variables defined in POU

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        """

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        # Get list of variables defined in POU

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        self.VariableList = {

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            var.Name: (var.Class, var.Type)

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            for var in self.Controller.GetEditedElementInterfaceVars(self.TagName)

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            if var.Edit}

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        # Add POU name to variable list if POU is a function

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        returntype = self.Controller.GetEditedElementInterfaceReturnType(self.TagName)

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        if returntype is not None:

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            self.VariableList[

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                self.Controller.GetEditedElementName(self.TagName)] = \

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                 ("Output", returntype)

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        # Add POU name if POU is a transition

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        words = self.TagName.split("::")

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        if words[0] == "T":

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            self.VariableList[words[2]] = ("Output", "BOOL")

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    def TestElementName(self, element_name):

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        """

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        Test displayed graphic element name

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        @param element_name: Graphic element name

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        """

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        # Variable containing error message format

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        message_format = None

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        # Get graphic element name in upper case

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        uppercase_element_name = element_name.upper()

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        # Test if graphic element name is a valid identifier

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        if not TestIdentifier(element_name):

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            message_format = _("\"%s\" is not a valid identifier!")

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        # Test that graphic element name isn't a keyword

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        elif uppercase_element_name in IEC_KEYWORDS:

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            message_format = _("\"%s\" is a keyword. It can't be used!")

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        # Test that graphic element name isn't a POU name

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        elif uppercase_element_name in self.Controller.GetProjectPouNames():

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            message_format = _("\"%s\" pou already exists!")

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        # Test that graphic element name isn't already used in POU by a variable

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        # or another graphic element

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        elif ((self.DefaultElementName is None or

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               self.DefaultElementName.upper() != uppercase_element_name) and

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              uppercase_element_name in self.Controller.GetEditedElementVariables(self.TagName)):

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            message_format = _("\"%s\" element for this pou already exists!")

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

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        if message_format is not None:

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            self.ShowErrorMessage(message_format % element_name)

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            # Test failed

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            return False

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        # Test succeed

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        return True

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    def ShowErrorMessage(self, message):

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        """

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        Show an error message dialog over this dialog

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        @param message: Error message to display

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        """

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        dialog = wx.MessageDialog(self, message,

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                                  _("Error"),

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                                  wx.OK | wx.ICON_ERROR)

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        dialog.ShowModal()

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        dialog.Destroy()

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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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        Need to be overridden by inherited classes to check that dialog values

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        are valid

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        @param event: wx.Event from OK button

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        """

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        # Close dialog

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        self.EndModal(wx.ID_OK)

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    def RefreshPreview(self):

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        """Triggers EVT_PAINT event to refresh UI"""

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        self.Refresh()

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    def DrawPreview(self):

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        """

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        Refresh preview panel of graphic element

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        May be overridden by inherited classes

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        """

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        # Init preview panel paint device context

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        dc = wx.PaintDC(self.Preview)

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        dc.SetFont(self.Preview.GetFont())

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        dc.Clear()

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        # Return immediately if no graphic element defined

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        if self.Element is None:

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            return

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        # Calculate block size according to graphic element min size due to its

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        # parameters and graphic element min size defined

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        min_width, min_height = self.GetMinElementSize()

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        width = max(self.MinElementSize[0], min_width)

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        height = max(self.MinElementSize[1], min_height)

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        self.Element.SetSize(width, height)

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        # Get element position and bounding box to center in preview

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        posx, posy = self.Element.GetPosition()

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        bbox = self.Element.GetBoundingBox()

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        # Get Preview panel size

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        client_size = self.Preview.GetClientSize()

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        # If graphic element is too big to be displayed in preview panel,

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        # calculate preview panel scale so that graphic element fit inside

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        k = 1.1 if (bbox.width * 1.1 > client_size.width or

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                    bbox.height * 1.1 > client_size.height) \

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            else 1.0

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        scale = (max(bbox.width / client_size.width,

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                     bbox.height / client_size.height) * k)

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        dc.SetUserScale(1.0 / scale, 1.0 / scale)

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        # Center graphic element in preview panel

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        x = int(client_size.width * scale - bbox.width) // 2 + posx - bbox.x

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        y = int(client_size.height * scale - bbox.height) // 2 + posy - bbox.y

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        self.Element.SetPosition(x, y)

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        # Draw graphic element

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        self.Element.Draw(dc)

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    def OnPaint(self, event):

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        """

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        Called when Preview panel need to be redraw

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        @param event: wx.PaintEvent

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        """

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        self.DrawPreview()

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        event.Skip()