#!/usr/bin/env python
# -*- coding: utf-8 -*-

# This file is part of Beremiz, a Integrated Development Environment for
# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.
#
# Copyright (C) 2013: Edouard TISSERANT and Laurent BESSARD
#
# See COPYING file for copyrights details.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.


from functools import cmp_to_key
from operator import eq
import os

import wx

from util.BitmapLibrary import GetBitmap

DRIVE, FOLDER, FILE = list(range(3))


def sort_folder(x, y):
    if x[1] == y[1]:
        return eq(x[0], y[0])
    elif x[1] != FILE:
        return -1
    else:
        return 1


def splitpath(path):
    head, tail = os.path.split(path)
    if head == "":
        return [tail]
    elif tail == "":
        return splitpath(head)
    return splitpath(head) + [tail]


class FolderTree(wx.Panel):

    def __init__(self, parent, folder, filter=None, editable=True):
        wx.Panel.__init__(self, parent, style=wx.TAB_TRAVERSAL)

        main_sizer = wx.BoxSizer(wx.VERTICAL)

        self.Tree = wx.TreeCtrl(self,
                                style=(wx.TR_HAS_BUTTONS |
                                       wx.TR_SINGLE |
                                       wx.SUNKEN_BORDER |
                                       wx.TR_HIDE_ROOT |
                                       wx.TR_LINES_AT_ROOT |
                                       wx.TR_EDIT_LABELS))
        if wx.Platform == '__WXMSW__':
            self.Bind(wx.EVT_TREE_ITEM_ACTIVATED, self.OnTreeItemExpanded, self.Tree)
            self.Tree.Bind(wx.EVT_LEFT_DOWN, self.OnTreeLeftDown)
        else:
            self.Bind(wx.EVT_TREE_ITEM_EXPANDED, self.OnTreeItemExpanded, self.Tree)
        self.Bind(wx.EVT_TREE_ITEM_COLLAPSED, self.OnTreeItemCollapsed, self.Tree)
        self.Bind(wx.EVT_TREE_BEGIN_LABEL_EDIT, self.OnTreeBeginLabelEdit, self.Tree)
        self.Bind(wx.EVT_TREE_END_LABEL_EDIT, self.OnTreeEndLabelEdit, self.Tree)
        main_sizer.Add(self.Tree, 1, flag=wx.GROW)

        if filter is not None:
            self.Filter = wx.ComboBox(self, style=wx.CB_READONLY)
            self.Bind(wx.EVT_COMBOBOX, self.OnFilterChanged, self.Filter)
            main_sizer.Add(self.Filter, flag=wx.GROW)
        else:
            self.Filter = None

        self.SetSizer(main_sizer)

        self.Folder = folder
        self.Editable = editable

        self.TreeImageList = wx.ImageList(16, 16)
        self.TreeImageDict = {}
        for item_type, bitmap in [(DRIVE, "tree_drive"),
                                  (FOLDER, "tree_folder"),
                                  (FILE, "tree_file")]:
            self.TreeImageDict[item_type] = self.TreeImageList.Add(GetBitmap(bitmap))
        self.Tree.SetImageList(self.TreeImageList)

        self.Filters = {}
        if self.Filter is not None:
            filter_parts = filter.split("|")
            for idx in range(0, len(filter_parts), 2):
                if filter_parts[idx + 1] == "*.*":
                    self.Filters[filter_parts[idx]] = ""
                else:
                    self.Filters[filter_parts[idx]] = filter_parts[idx + 1].replace("*", "")
                self.Filter.Append(filter_parts[idx])
                if idx == 0:
                    self.Filter.SetStringSelection(filter_parts[idx])

            self.CurrentFilter = self.Filters[self.Filter.GetStringSelection()]
        else:
            self.CurrentFilter = ""

    def _GetFolderChildren(self, folderpath, recursive=True):
        items = []
        if wx.Platform == '__WXMSW__' and folderpath == "/":
            for c in range(ord('a'), ord('z')):
                drive = os.path.join("%s:\\" % chr(c))
                if os.path.exists(drive):
                    items.append((drive, DRIVE, self._GetFolderChildren(drive, False)))
        else:
            try:
                files = os.listdir(folderpath)
            except Exception:
                return []
            for filename in files:
                if not filename.startswith("."):
                    filepath = os.path.join(folderpath, filename)
                    if os.path.isdir(filepath):
                        if recursive:
                            children = len(self._GetFolderChildren(filepath, False))
                        else:
                            children = 0
                        items.append((filename, FOLDER, children))
                    elif (self.CurrentFilter == "" or
                          os.path.splitext(filename)[1] == self.CurrentFilter):
                        items.append((filename, FILE, None))
        if recursive:
            items.sort(key=cmp_to_key(sort_folder))
        return items

    def SetFilter(self, filter):
        self.CurrentFilter = filter

    def GetTreeCtrl(self):
        return self.Tree

    def RefreshTree(self):
        root = self.Tree.GetRootItem()
        if not root.IsOk():
            root = self.Tree.AddRoot("")
        self.GenerateTreeBranch(root, self.Folder)

    def GenerateTreeBranch(self, root, folderpath):
        item, item_cookie = self.Tree.GetFirstChild(root)
        for idx, (filename, item_type, children) in enumerate(self._GetFolderChildren(folderpath)):
            if not item.IsOk():
                item = self.Tree.AppendItem(root, filename, self.TreeImageDict[item_type])
                if wx.Platform != '__WXMSW__':
                    item, item_cookie = self.Tree.GetNextChild(root, item_cookie)
            elif self.Tree.GetItemText(item) != filename:
                item = self.Tree.InsertItem(root, idx, filename, self.TreeImageDict[item_type])
            filepath = os.path.join(folderpath, filename)
            if item_type != FILE:
                if self.Tree.IsExpanded(item):
                    self.GenerateTreeBranch(item, filepath)
                elif children > 0:
                    self.Tree.SetItemHasChildren(item)
            item, item_cookie = self.Tree.GetNextChild(root, item_cookie)
        to_delete = []
        while item.IsOk():
            to_delete.append(item)
            item, item_cookie = self.Tree.GetNextChild(root, item_cookie)
        for item in to_delete:
            self.Tree.Delete(item)

    def ExpandItem(self, item):
        self.GenerateTreeBranch(item, self.GetPath(item))
        self.Tree.Expand(item)

    def OnTreeItemActivated(self, event):
        self.ExpandItem(event.GetItem())
        event.Skip()

    def OnTreeLeftDown(self, event):
        item, flags = self.Tree.HitTest(event.GetPosition())
        if flags & wx.TREE_HITTEST_ONITEMBUTTON and not self.Tree.IsExpanded(item):
            self.ExpandItem(item)
        else:
            event.Skip()

    def OnTreeItemExpanded(self, event):
        item = event.GetItem()
        self.GenerateTreeBranch(item, self.GetPath(item))
        event.Skip()

    def OnTreeItemCollapsed(self, event):
        item = event.GetItem()
        self.Tree.DeleteChildren(item)
        self.Tree.SetItemHasChildren(item)
        event.Skip()

    def OnTreeBeginLabelEdit(self, event):
        item = event.GetItem()
        if self.Editable and not self.Tree.ItemHasChildren(item):
            event.Skip()
        else:
            event.Veto()

    def OnTreeEndLabelEdit(self, event):
        new_name = event.GetLabel()
        if new_name != "":
            old_filepath = self.GetPath(event.GetItem())
            new_filepath = os.path.join(os.path.split(old_filepath)[0], new_name)
            if new_filepath != old_filepath:
                if not os.path.exists(new_filepath):
                    os.rename(old_filepath, new_filepath)
                    event.Skip()
                else:
                    message = wx.MessageDialog(self,
                                               _("File '%s' already exists!") % new_name,
                                               _("Error"), wx.OK | wx.ICON_ERROR)
                    message.ShowModal()
                    message.Destroy()
                    event.Veto()
        else:
            event.Skip()

    def OnFilterChanged(self, event):
        self.CurrentFilter = self.Filters[self.Filter.GetStringSelection()]
        self.RefreshTree()
        event.Skip()

    def _SelectItem(self, root, parts):
        if len(parts) == 0:
            self.Tree.SelectItem(root)
        else:
            item, item_cookie = self.Tree.GetFirstChild(root)
            while item.IsOk():
                if self.Tree.GetItemText(item) == parts[0]:
                    if self.Tree.ItemHasChildren(item) and \
                       not self.Tree.IsExpanded(item):
                        self.Tree.Expand(item)
                        wx.CallAfter(self._SelectItem, item, parts[1:])
                    else:
                        self._SelectItem(item, parts[1:])
                    return
                item, item_cookie = self.Tree.GetNextChild(root, item_cookie)

    def SetPath(self, path):
        if path.startswith(self.Folder):
            root = self.Tree.GetRootItem()
            if root.IsOk():
                relative_path = path.replace(os.path.join(self.Folder, ""), "")
                self._SelectItem(root, splitpath(relative_path))

    def GetPath(self, item=None):
        if item is None:
            item = self.Tree.GetSelection()
        if item.IsOk():
            filepath = self.Tree.GetItemText(item)
            parent = self.Tree.GetItemParent(item)
            while parent.IsOk() and parent != self.Tree.GetRootItem():
                filepath = os.path.join(self.Tree.GetItemText(parent), filepath)
                parent = self.Tree.GetItemParent(parent)
            return os.path.join(self.Folder, filepath)
        return self.Folder