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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) 2007: 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 graphics import *

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

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#                                    Helpers

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

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VARIABLE_CLASSES_DICT = {INPUT : _("Input"),

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                         INOUT : _("InOut"),

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                         OUTPUT : _("Output")}

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VARIABLE_CLASSES_DICT_REVERSE = dict(

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    [(value, key) for key, value in VARIABLE_CLASSES_DICT.iteritems()])

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

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#                          Create New Variable Dialog

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

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class FBDVariableDialog(wx.Dialog):

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    def __init__(self, parent, controller, transition = ""):

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        wx.Dialog.__init__(self, parent,

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              size=wx.Size(400, 380), title=_('Variable Properties'))

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        main_sizer = wx.FlexGridSizer(cols=1, hgap=0, rows=4, vgap=10)

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        main_sizer.AddGrowableCol(0)

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        main_sizer.AddGrowableRow(2)

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        column_sizer = wx.BoxSizer(wx.HORIZONTAL)

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        main_sizer.AddSizer(column_sizer, border=20, 

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

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        left_gridsizer = wx.FlexGridSizer(cols=1, hgap=0, rows=6, vgap=5)

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        left_gridsizer.AddGrowableCol(0)

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        column_sizer.AddSizer(left_gridsizer, 1, border=5, 

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              flag=wx.GROW|wx.RIGHT)

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        class_label = wx.StaticText(self, label=_('Class:'))

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        left_gridsizer.AddWindow(class_label, flag=wx.GROW)

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        self.Class = wx.ComboBox(self, style=wx.CB_READONLY)

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        self.Bind(wx.EVT_COMBOBOX, self.OnClassChanged, self.Class)

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        left_gridsizer.AddWindow(self.Class, flag=wx.GROW)

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        expression_label = wx.StaticText(self, label=_('Expression:'))

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        left_gridsizer.AddWindow(expression_label, flag=wx.GROW)

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        self.Expression = wx.TextCtrl(self)

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        self.Bind(wx.EVT_TEXT, self.OnExpressionChanged, self.Expression)

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        left_gridsizer.AddWindow(self.Expression, flag=wx.GROW)

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        execution_order_label = wx.StaticText(self, label=_('Execution Order:'))

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        left_gridsizer.AddWindow(execution_order_label, flag=wx.GROW)

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        self.ExecutionOrder = wx.SpinCtrl(self, min=0, style=wx.SP_ARROW_KEYS)

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        self.Bind(wx.EVT_SPINCTRL, self.OnExecutionOrderChanged, self.ExecutionOrder)

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        left_gridsizer.AddWindow(self.ExecutionOrder, flag=wx.GROW)

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        right_gridsizer = wx.FlexGridSizer(cols=1, hgap=0, rows=2, vgap=5)

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        right_gridsizer.AddGrowableCol(0)

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        right_gridsizer.AddGrowableRow(1)

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        column_sizer.AddSizer(right_gridsizer, 1, border=5, 

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              flag=wx.GROW|wx.LEFT)

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

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        right_gridsizer.AddWindow(name_label, flag=wx.GROW)

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        self.VariableName = wx.ListBox(self, style=wx.LB_SINGLE|wx.LB_SORT)

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        self.Bind(wx.EVT_LISTBOX, self.OnNameChanged, self.VariableName)

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        right_gridsizer.AddWindow(self.VariableName, flag=wx.GROW)

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

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        main_sizer.AddWindow(preview_label, border=20,

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

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        self.Preview = wx.Panel(self, 

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              style=wx.TAB_TRAVERSAL|wx.SIMPLE_BORDER)

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        self.Preview.SetBackgroundColour(wx.Colour(255,255,255))

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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, "IsOfType", controller.IsOfType)

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

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        main_sizer.AddWindow(self.Preview, border=20,

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

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

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        self.Bind(wx.EVT_BUTTON, self.OnOK, button_sizer.GetAffirmativeButton())

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        main_sizer.AddSizer(button_sizer, border=20, 

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

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        self.SetSizer(main_sizer)

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        self.Transition = transition

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        self.Variable = None

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        self.VarList = []

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        self.MinVariableSize = None

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        for choice in VARIABLE_CLASSES_DICT.itervalues():

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            self.Class.Append(choice)

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        self.Class.SetStringSelection(VARIABLE_CLASSES_DICT[INPUT])

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        self.RefreshNameList()

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        self.Class.SetFocus()

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    def SetPreviewFont(self, font):

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        self.Preview.SetFont(font)

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    def RefreshNameList(self):

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        selected = self.VariableName.GetStringSelection()

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        var_class = VARIABLE_CLASSES_DICT_REVERSE[self.Class.GetStringSelection()]

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        self.VariableName.Clear()

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        self.VariableName.Append("")

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        for name, var_type, value_type in self.VarList:

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            if var_type != "Input" or var_class == INPUT:

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                self.VariableName.Append(name)

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        if selected != "" and self.VariableName.FindString(selected) != wx.NOT_FOUND:

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            self.VariableName.SetStringSelection(selected)

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            self.Expression.Enable(False)

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        else:

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            self.VariableName.SetStringSelection("")

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            #self.Expression.Enable(var_class == INPUT)

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        self.VariableName.Enable(self.VariableName.GetCount() > 0)

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    def SetMinVariableSize(self, size):

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        self.MinVariableSize = size

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    def SetVariables(self, vars):

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        self.VarList = vars

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        self.RefreshNameList()

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    def SetValues(self, values):

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        value_type = values.get("type", None)

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        value_name = values.get("name", None)

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        if value_type:

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            self.Class.SetStringSelection(VARIABLE_CLASSES_DICT[value_type])

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            self.RefreshNameList()

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        if value_name:

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            if self.VariableName.FindString(value_name) != wx.NOT_FOUND:

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                self.VariableName.SetStringSelection(value_name)

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                self.Expression.Enable(False)

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            else:

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                self.Expression.SetValue(value_name)

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                self.VariableName.Enable(False)

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        if "executionOrder" in values:

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            self.ExecutionOrder.SetValue(values["executionOrder"])

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        self.RefreshPreview()

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    def GetValues(self):

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        values = {}

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        values["type"] = VARIABLE_CLASSES_DICT_REVERSE[self.Class.GetStringSelection()]

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        expression = self.Expression.GetValue()

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        if self.Expression.IsEnabled() and expression != "":

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            values["name"] = expression

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        else:

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            values["name"] = self.VariableName.GetStringSelection()

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        values["value_type"] = None

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        for var_name, var_type, value_type in self.VarList:

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            if var_name == values["name"]:

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                values["value_type"] = value_type

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

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        values["executionOrder"] = self.ExecutionOrder.GetValue()

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        return values

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    def OnOK(self, event):

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        message = None

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        expression = self.Expression.GetValue()

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        if self.Expression.IsEnabled():

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            value = expression

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        else:

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            value = self.VariableName.GetStringSelection()

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        if value == "":

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            message = _("At least a variable or an expression must be selected!")

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        elif value.upper() in IEC_KEYWORDS:

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

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        if message is not None:

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            message = wx.MessageDialog(self, message, _("Error"), wx.OK|wx.ICON_ERROR)

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            message.ShowModal()

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            message.Destroy()

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        else:

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            self.EndModal(wx.ID_OK)

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    def OnClassChanged(self, event):

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        self.RefreshNameList()

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        self.RefreshPreview()

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        event.Skip()

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    def OnNameChanged(self, event):

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        if self.VariableName.GetStringSelection() != "":

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            self.Expression.Enable(False)

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        elif VARIABLE_CLASSES_DICT_REVERSE[self.Class.GetStringSelection()] == INPUT:

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            self.Expression.Enable(True)

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        self.RefreshPreview()

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        event.Skip()

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    def OnExpressionChanged(self, event):

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        if self.Expression.GetValue() != "":

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            self.VariableName.Enable(False)

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        else:

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            self.VariableName.Enable(True)

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        self.RefreshPreview()

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        event.Skip()

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    def OnExecutionOrderChanged(self, event):

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        self.RefreshPreview()

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        event.Skip()

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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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        expression = self.Expression.GetValue()

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        if self.Expression.IsEnabled() and expression != "":

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            name = expression

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        else:

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            name = self.VariableName.GetStringSelection()

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        type = ""

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        for var_name, var_type, value_type in self.VarList:

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            if var_name == name:

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                type = value_type

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        classtype = VARIABLE_CLASSES_DICT_REVERSE[self.Class.GetStringSelection()]

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        self.Variable = FBD_Variable(self.Preview, classtype, name, type, executionOrder = self.ExecutionOrder.GetValue())

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        width, height = self.MinVariableSize

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        min_width, min_height = self.Variable.GetMinSize()

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        width, height = max(min_width, width), max(min_height, height)

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        self.Variable.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.Variable.SetPosition(x, y)

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        self.Variable.Draw(dc)

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    def OnPaint(self, event):

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        self.RefreshPreview()

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        event.Skip()