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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) 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 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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import wx

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from dialogs.BrowseLocationsDialog import BrowseLocationsDialog

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class LocationCellControl(wx.PyControl):

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    '''

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    Custom cell editor control with a text box and a button that launches

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    the BrowseLocationsDialog.

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    '''

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    def __init__(self, parent):

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        wx.PyControl.__init__(self, parent)

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

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        main_sizer.AddGrowableCol(0)

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        main_sizer.AddGrowableRow(0)

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        # create location text control

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        self.Location = wx.TextCtrl(self, size=wx.Size(0, -1),

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                                    style=wx.TE_PROCESS_ENTER)

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        self.Location.Bind(wx.EVT_KEY_DOWN, self.OnLocationChar)

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        main_sizer.Add(self.Location, flag=wx.GROW)

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        # create browse button

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        self.BrowseButton = wx.Button(self, label='...', size=wx.Size(30, -1))

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        self.BrowseButton.Bind(wx.EVT_BUTTON, self.OnBrowseButtonClick)

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        main_sizer.Add(self.BrowseButton, flag=wx.GROW)

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        self.Bind(wx.EVT_SIZE, self.OnSize)

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        self.SetSizer(main_sizer)

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        self.Controller = None

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        self.VarType = None

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        self.Default = False

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        self.VariableName = None

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    def __del__(self):

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        self.Controller = None

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    def SetController(self, controller):

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        self.Controller = controller

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    def SetVarType(self, vartype):

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        self.VarType = vartype

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    def GetVarType(self):

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        return self.VarType

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    def SetValue(self, value):

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        self.Default = value

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        self.VariableName = None

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        self.VarType = None

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        self.Location.SetValue(value)

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    def GetValue(self):

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        return self.Location.GetValue()

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    def GetName(self):

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        return self.VariableName

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    def OnSize(self, event):

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        self.Layout()

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    def OnBrowseButtonClick(self, event):

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        # pop up the location browser dialog

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        dialog = BrowseLocationsDialog(self, self.VarType, self.Controller)

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        if dialog.ShowModal() == wx.ID_OK:

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            infos = dialog.GetValues()

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        else:

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            infos = None

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        dialog.Destroy()

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        if infos is not None:

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            location = infos["location"]

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            # set the location

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            if not infos["location"].startswith("%"):

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                dialog = wx.SingleChoiceDialog(

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                    self,

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                    _("Select a variable class:"),

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                    _("Variable class"),

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                    [_("Input"), _("Output"), _("Memory")],

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                    wx.DEFAULT_DIALOG_STYLE | wx.OK | wx.CANCEL)

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                if dialog.ShowModal() == wx.ID_OK:

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                    selected = dialog.GetSelection()

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                else:

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                    selected = None

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                dialog.Destroy()

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                if selected is None:

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                    self.Location.SetFocus()

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                    return

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                if selected == 0:

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                    location = "%I" + location

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                elif selected == 1:

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                    location = "%Q" + location

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                else:

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                    location = "%M" + location

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            self.Location.SetValue(location)

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            self.VariableName = infos["var_name"]

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            self.VarType = infos["IEC_type"]

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            # when user selected something, end editing immediately

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            # so that changes over multiple colums appear

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            wx.CallAfter(self.Parent.Parent.CloseEditControl)

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        self.Location.SetFocus()

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    def OnLocationChar(self, event):

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        keycode = event.GetKeyCode()

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        if keycode in [wx.WXK_RETURN, wx.WXK_TAB]:

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            self.Parent.Parent.ProcessEvent(event)

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        elif keycode == wx.WXK_ESCAPE:

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            self.Location.SetValue(self.Default)

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            self.Parent.Parent.CloseEditControl()

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        else:

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            event.Skip()

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    def SetInsertionPoint(self, i):

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        self.Location.SetInsertionPoint(i)

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    def SetFocus(self):

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        self.Location.SetFocus()

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class LocationCellEditor(wx.grid.GridCellEditor):

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    '''

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    Grid cell editor that uses LocationCellControl to display a browse button.

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    '''

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    def __init__(self, table, controller):

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        wx.grid.GridCellEditor.__init__(self)

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        self.Table = table

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        self.Controller = controller

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    def __del__(self):

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        self.CellControl = None

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        self.Controller = None

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    def Create(self, parent, id, evt_handler):

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        self.CellControl = LocationCellControl(parent)

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        self.SetControl(self.CellControl)

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        if evt_handler:

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            self.CellControl.PushEventHandler(evt_handler)

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    def BeginEdit(self, row, col, grid):

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        self.CellControl.Enable()

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        self.CellControl.SetController(self.Controller)

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        self.CellControl.SetValue(self.Table.GetValueByName(row, 'Location'))

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        if isinstance(self.CellControl, LocationCellControl):

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            self.CellControl.SetVarType(self.Table.GetValueByName(row, 'Type'))

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        self.CellControl.SetFocus()

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    def EndEditInternal(self, row, col, grid, old_loc):

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        loc = self.CellControl.GetValue()

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        changed = loc != old_loc

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        if changed:

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            name = self.CellControl.GetName()

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            if name is not None:

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                message = self.Table.Parent.CheckVariableName(name, row)

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                if message is not None:

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                    wx.CallAfter(self.Table.Parent.ShowErrorMessage, message)

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                    return None

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                old_name = self.Table.GetValueByName(row, 'Name')

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                self.Table.SetValueByName(row, 'Name', name)

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                self.Table.Parent.OnVariableNameChange(old_name, name)

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            self.Table.SetValueByName(row, 'Location', loc)

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            var_type = self.CellControl.GetVarType()

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            if var_type is not None:

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                self.Table.SetValueByName(row, 'Type', var_type)

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        else:

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            wx.CallAfter(self.Table.Parent.ShowErrorMessage,

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                         _("Selected location is identical to previous one"))

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        self.CellControl.Disable()

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        return changed

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    if wx.VERSION >= (3, 0, 0):

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        def EndEdit(self, row, col, grid, oldval):

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            return self.EndEditInternal(row, col, grid, oldval)

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    else:

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        def EndEdit(self, row, col, grid):

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            old_loc = self.Table.GetValueByName(row, 'Location')

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            return self.EndEditInternal(row, col, grid, old_loc)

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    def SetSize(self, rect):

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        self.CellControl.SetDimensions(rect.x + 1, rect.y,

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                                       rect.width, rect.height,

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                                       wx.SIZE_ALLOW_MINUS_ONE)

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    def Clone(self):

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        return LocationCellEditor(self.Table, self.Controller)