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

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#                                 Helpers

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

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[CATEGORY, BLOCK] = range(2)

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

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#                              Library Panel

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

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class LibraryPanel(wx.Panel):

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    def __init__(self, parent, enable_drag=False):

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        wx.Panel.__init__(self, parent, style=wx.TAB_TRAVERSAL)

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

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        main_sizer.AddGrowableCol(0)

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        main_sizer.AddGrowableRow(1)

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        self.SearchCtrl = wx.SearchCtrl(self)

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        self.SearchCtrl.ShowSearchButton(True)

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        self.Bind(wx.EVT_TEXT, self.OnSearchCtrlChanged, self.SearchCtrl)

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        self.Bind(wx.EVT_SEARCHCTRL_SEARCH_BTN, 

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              self.OnSearchButtonClick, self.SearchCtrl)

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        search_textctrl = self.SearchCtrl.GetChildren()[0]

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        search_textctrl.Bind(wx.EVT_CHAR, self.OnKeyDown)

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        main_sizer.AddWindow(self.SearchCtrl, flag=wx.GROW)

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        splitter_window = wx.SplitterWindow(self)

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        splitter_window.SetSashGravity(1.0)

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        main_sizer.AddWindow(splitter_window, flag=wx.GROW)

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        self.Tree = wx.TreeCtrl(splitter_window,

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              size=wx.Size(0, 0),  

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              style=wx.TR_HAS_BUTTONS|

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                    wx.TR_SINGLE|

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                    wx.SUNKEN_BORDER|

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                    wx.TR_HIDE_ROOT|

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                    wx.TR_LINES_AT_ROOT)

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        self.Bind(wx.EVT_TREE_SEL_CHANGED, self.OnTreeItemSelected, self.Tree)

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        self.Tree.Bind(wx.EVT_CHAR, self.OnKeyDown)

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        if enable_drag:

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            self.Bind(wx.EVT_TREE_BEGIN_DRAG, self.OnTreeBeginDrag, self.Tree)

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        self.Comment = wx.TextCtrl(splitter_window, size=wx.Size(0, 80), 

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              style=wx.TE_READONLY|wx.TE_MULTILINE)

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        splitter_window.SplitHorizontally(self.Tree, self.Comment, -80)

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        self.SetSizer(main_sizer)

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        self.Controller = None

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        self.BlockList = 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 SetBlockList(self, blocklist):

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        self.BlockList = blocklist

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        self.RefreshTree()

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    def SetFocus(self):

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        self.SearchCtrl.SetFocus()

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    def ResetTree(self):

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        self.SearchCtrl.SetValue("")

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        self.Tree.DeleteAllItems()

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        self.Comment.SetValue("")

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    def RefreshTree(self):

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        if self.Controller is not None:

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            to_delete = []

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            selected_name = None

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            selected = self.Tree.GetSelection()

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            if selected.IsOk():

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                selected_pydata = self.Tree.GetPyData(selected)

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                if selected_pydata is not None and selected_pydata["type"] != CATEGORY:

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                    selected_name = self.Tree.GetItemText(selected)

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            if self.BlockList is not None:

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                blocktypes = self.BlockList

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            else:

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                blocktypes = self.Controller.GetBlockTypes()

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            root = self.Tree.GetRootItem()

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            if not root.IsOk():

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                root = self.Tree.AddRoot("")

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            category_item, root_cookie = self.Tree.GetFirstChild(root)

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            for category in blocktypes:

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                category_name = category["name"]

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                if not category_item.IsOk():

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                    category_item = self.Tree.AppendItem(root, _(category_name))

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                    if wx.Platform != '__WXMSW__':

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                        category_item, root_cookie = self.Tree.GetNextChild(root, root_cookie)

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                else:

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                    self.Tree.SetItemText(category_item, _(category_name))

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                self.Tree.SetPyData(category_item, {"type" : CATEGORY})

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                blocktype_item, category_cookie = self.Tree.GetFirstChild(category_item)

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                for blocktype in category["list"]:

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                    if not blocktype_item.IsOk():

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                        blocktype_item = self.Tree.AppendItem(category_item, blocktype["name"])

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                        if wx.Platform != '__WXMSW__':

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                            blocktype_item, category_cookie = self.Tree.GetNextChild(category_item, category_cookie)

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                    else:

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                        self.Tree.SetItemText(blocktype_item, blocktype["name"])

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                    block_data = {"type" : BLOCK, 

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                                  "block_type" : blocktype["type"], 

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                                  "inputs" : tuple([type for name, type, modifier in blocktype["inputs"]]), 

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                                  "extension" : None}

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                    if blocktype["extensible"]:

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                        block_data["extension"] = len(blocktype["inputs"])

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                    self.Tree.SetPyData(blocktype_item, block_data)

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                    if selected_name == blocktype["name"]:

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                        self.Tree.SelectItem(blocktype_item)

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                        comment = blocktype["comment"]

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                        self.Comment.SetValue(_(comment) + blocktype.get("usage", ""))

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                    blocktype_item, category_cookie = self.Tree.GetNextChild(category_item, category_cookie)

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                while blocktype_item.IsOk():

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                    to_delete.append(blocktype_item)

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                    blocktype_item, category_cookie = self.Tree.GetNextChild(category_item, category_cookie)

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                category_item, root_cookie = self.Tree.GetNextChild(root, root_cookie)

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            while category_item.IsOk():

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                to_delete.append(category_item)

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                category_item, root_cookie = self.Tree.GetNextChild(root, root_cookie)

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            for item in to_delete:

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                self.Tree.Delete(item)

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    def GetSelectedBlock(self):

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        selected = self.Tree.GetSelection()

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        if (selected.IsOk() and 

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            self.Tree.GetItemParent(selected) != self.Tree.GetRootItem() and 

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            selected != self.Tree.GetRootItem()):

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            selected_data = self.Tree.GetPyData(selected)

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            return {"type": self.Tree.GetItemText(selected), 

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                    "inputs": selected_data["inputs"]}

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        return None

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    def SelectTreeItem(self, name, inputs):

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        item = self.FindTreeItem(self.Tree.GetRootItem(), name, inputs)

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        if item is not None and item.IsOk():

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            self.Tree.SelectItem(item)

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            self.Tree.EnsureVisible(item)

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    def FindTreeItem(self, root, name, inputs = None):

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        if root.IsOk():

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            pydata = self.Tree.GetPyData(root)

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            if pydata is not None:

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                type_inputs = pydata.get("inputs", None)

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                type_extension = pydata.get("extension", None)

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                if inputs is not None and type_inputs is not None:

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                    if type_extension is not None:

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                        same_inputs = type_inputs == inputs[:type_extension]

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                    else:

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                        same_inputs = type_inputs == inputs

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                else:

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                    same_inputs = True

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            if pydata is not None and self.Tree.GetItemText(root) == name and same_inputs:

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                return root

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            else:

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                if wx.VERSION < (2, 6, 0):

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                    item, root_cookie = self.Tree.GetFirstChild(root, 0)

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                else:

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                    item, root_cookie = self.Tree.GetFirstChild(root)

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                while item.IsOk():

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                    result = self.FindTreeItem(item, name, inputs)

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                    if result:

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                        return result

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                    item, root_cookie = self.Tree.GetNextChild(root, root_cookie)

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        return None

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    def SearchInTree(self, value, mode="first"):

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        root = self.Tree.GetRootItem()

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        if not root.IsOk():

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            return False

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        if mode == "first":

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            item, item_cookie = self.Tree.GetFirstChild(root)

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            selected = None

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        else:

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            item = self.Tree.GetSelection()

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            selected = item

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            if not item.IsOk():

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                item, item_cookie = self.Tree.GetFirstChild(root)

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        while item.IsOk():

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            item_pydata = self.Tree.GetPyData(item)

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            if item_pydata["type"] == CATEGORY:

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                if mode == "previous":

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                    child = self.Tree.GetLastChild(item)

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                else:

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                    child, child_cookie = self.Tree.GetFirstChild(item)

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                if child.IsOk():

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                    item = child

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                elif mode == "previous":

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                    item = self.Tree.GetPrevSibling(item)

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                else:

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                    item = self.Tree.GetNextSibling(item)

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            else:

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                name = self.Tree.GetItemText(item)

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                    child, child_cookie = self.Tree.GetFirstChild(root)

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                    while child.IsOk():

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                        self.Tree.CollapseAllChildren(child)

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                        child, child_cookie = self.Tree.GetNextChild(root, child_cookie)

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                    self.Tree.SelectItem(item)

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                    self.Tree.EnsureVisible(item)

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                    return True

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                elif mode == "previous":

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                    previous = self.Tree.GetPrevSibling(item)

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                    if previous.IsOk():

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                        item = previous

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                    else:

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                        parent = self.Tree.GetItemParent(item)

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                        item = self.Tree.GetPrevSibling(parent)

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                else:

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                    next = self.Tree.GetNextSibling(item)

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                    if next.IsOk():

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                        item = next

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                    else:

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                        parent = self.Tree.GetItemParent(item)

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                        item = self.Tree.GetNextSibling(parent)

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        return False

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    def OnSearchCtrlChanged(self, event):

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        self.SearchInTree(self.SearchCtrl.GetValue())

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        event.Skip()

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    def OnSearchButtonClick(self, event):

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        self.SearchInTree(self.SearchCtrl.GetValue(), "next")

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        event.Skip()

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    def OnTreeItemSelected(self, event):

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        selected = event.GetItem()

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        pydata = self.Tree.GetPyData(selected)

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        if pydata is not None and pydata["type"] != CATEGORY:

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            blocktype = self.Controller.GetBlockType(self.Tree.GetItemText(selected), pydata["inputs"])

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            if blocktype:

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                comment = blocktype["comment"]

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                self.Comment.SetValue(_(comment) + blocktype.get("usage", ""))

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            else:

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                self.Comment.SetValue("")

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        else:

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            self.Comment.SetValue("")

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        if getattr(self, "_OnTreeItemSelected", None) is not None:

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            self._OnTreeItemSelected(event)

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        event.Skip()

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    def OnTreeBeginDrag(self, event):

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        selected = event.GetItem()

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        pydata = self.Tree.GetPyData(selected)

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        if pydata is not None and pydata["type"] == BLOCK:

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            data = wx.TextDataObject(str((self.Tree.GetItemText(selected), 

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                pydata["block_type"], "", pydata["inputs"])))

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            dragSource = wx.DropSource(self.Tree)

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            dragSource.SetData(data)

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            dragSource.DoDragDrop()

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    def OnKeyDown(self, event):

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        keycode = event.GetKeyCode()

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        search_value = self.SearchCtrl.GetValue()

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        if keycode == wx.WXK_UP and search_value != "":

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            self.SearchInTree(search_value, "previous")

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        elif keycode == wx.WXK_DOWN and search_value != "":

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            self.SearchInTree(search_value, "next")

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        else:

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            event.Skip()