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

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        self.Controller = controller

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        self.TagName = tagname

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

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

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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.Block = None

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        self.DefaultBlockName = None

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        self.MinBlockSize = None

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    def __del__(self):

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        self.Controller = None

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    def SetMinBlockSize(self, size):

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        self.MinBlockSize = size

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    def SetPreviewFont(self, font):

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        self.Preview.SetFont(font)

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    def TestBlockName(self, block_name):

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        format = None

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        uppercase_block_name = block_name.upper()

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        if not TestIdentifier(block_name):

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

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        elif uppercase_block_name in IEC_KEYWORDS:

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

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        elif uppercase_block_name in self.Controller.GetProjectPouNames():

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

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        elif ((self.DefaultBlockName is None or 

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               self.DefaultBlockName.upper() != uppercase_block_name) and 

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              uppercase_block_name in self.Controller.GetEditedElementVariables(

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                                                                self.TagName)):

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

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        if format is not None:

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            self.ShowErrorMessage(format % block_name)

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            return False

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        return True

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    def ShowErrorMessage(self, message):

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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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        self.EndModal(wx.ID_OK)

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    def RefreshPreview(self):

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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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        if self.Block is not None:

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            min_width, min_height = self.Block.GetMinSize()

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

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

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            self.Block.SetSize(width, height)

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            clientsize = self.Preview.GetClientSize()

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            x = (clientsize.width - width) / 2

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            y = (clientsize.height - height) / 2

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            self.Block.SetPosition(x, y)

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            self.Block.Draw(dc)

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    def OnPaint(self, event):

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        self.RefreshPreview()

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        event.Skip()

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