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#!/usr/bin/env python

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

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#This file is part of PLCOpenEditor, a library implementing an IEC 61131-3 editor

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#based on the plcopen standard. 

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#

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#Copyright (C) 2013: Edouard TISSERANT and Laurent BESSARD

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#

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#See COPYING file for copyrights details.

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#

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

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#modify it under the terms of the GNU General Public

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#License as published by the Free Software Foundation; either

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#version 2.1 of the License, or (at your option) any later version.

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#

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#This library 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 GNU

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#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

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

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#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

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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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"""

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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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class BlockPreviewDialog(wx.Dialog):

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    def __init__(self, parent, controller, tagname, size, 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 size: wx.Size object containing size of dialog

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        @param title: Title of dialog frame

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        """

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        wx.Dialog.__init__(self, parent, size=size, 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, 

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                  self.ButtonSizer.GetAffirmativeButton())

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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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    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 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 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 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.\

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                    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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        """

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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.ClientDC(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.Element.GetMinSize()

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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 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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        scale = (max(float(width) / client_size.width, 

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                     float(height) / client_size.height) * 1.2

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                 if width * 1.2 > client_size.width or 

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                    height * 1.2 > client_size.height

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                 else 1.0)

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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 - width) / 2

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

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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.RefreshPreview()

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        event.Skip()

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