"""!
@package modules.extensions

@brief GRASS Addons extensions management classes

Classes:
 - extensions::InstallExtensionWindow
 - extensions::ExtensionTreeModelBuilder
 - extensions::UninstallExtensionWindow
 - extensions::CheckListExtension

(C) 2008-2013 by the GRASS Development Team

This program is free software under the GNU General Public License
(>=v2). Read the file COPYING that comes with GRASS for details.

@author Martin Landa <landa.martin gmail.com>
@author Anna Petrasova <kratochanna gmail.com>
"""

import os
import sys

import wx

from grass.script import task as gtask

from core             import globalvar
from core.gcmd        import GError, RunCommand
from core.utils       import SetAddOnPath
from core.menutree    import TreeModel, ModuleNode
from gui_core.widgets import GListCtrl, SearchModuleWidget
from gui_core.treeview import CTreeView


class InstallExtensionWindow(wx.Frame):
    def __init__(self, parent, id = wx.ID_ANY,
                 title = _("Fetch & install extension from GRASS Addons"), **kwargs):
        self.parent = parent
        self.options = dict() # list of options
        
        wx.Frame.__init__(self, parent = parent, id = id, title = title, **kwargs)
        self.SetIcon(wx.Icon(os.path.join(globalvar.ETCICONDIR, 'grass.ico'), wx.BITMAP_TYPE_ICO))
        
        self.panel = wx.Panel(parent = self, id = wx.ID_ANY)

        self.repoBox = wx.StaticBox(parent = self.panel, id = wx.ID_ANY,
                                    label = " %s " % _("Repository"))
        self.treeBox = wx.StaticBox(parent = self.panel, id = wx.ID_ANY,
                                    label = " %s " % _("List of extensions - double-click to install"))
        
        self.repo = wx.TextCtrl(parent = self.panel, id = wx.ID_ANY)
        
        # modelBuilder loads data into tree model
        self.modelBuilder = ExtensionTreeModelBuilder()
        # tree view displays model data
        self.tree = CTreeView(parent=self.panel, model=self.modelBuilder.GetModel())
        
        self.search = SearchModuleWidget(parent=self.panel, model=self.modelBuilder.GetModel(),
                                         showChoice = False)
        self.search.SetSelection(0)
        self.search.showSearchResult.connect(lambda result: self.tree.Select(result))
        # show text in statusbar when notification appears
        self.search.showNotification.connect(lambda message: self.SetStatusText(message))

        self.optionBox = wx.StaticBox(parent = self.panel, id = wx.ID_ANY,
                                      label = " %s " % _("Options"))
        if sys.platform == 'win32':
            task = gtask.parse_interface('g.extension.py')
        else:
            task = gtask.parse_interface('g.extension')
        ignoreFlags = ['l', 'c', 'g', 'a', 'f', 't', 'quiet']
        if sys.platform == 'win32':
            ignoreFlags.append('d')
            ignoreFlags.append('i')
        
        for f in task.get_options()['flags']:
            name = f.get('name', '')
            desc = f.get('label', '')
            if not desc:
                desc = f.get('description', '')
            if not name and not desc:
                continue
            if name in ignoreFlags:
                continue
            self.options[name] = wx.CheckBox(parent = self.panel, id = wx.ID_ANY,
                                             label = desc)
        defaultUrl = 'http://svn.osgeo.org/grass/grass-addons/grass7'
        self.repo.SetValue(task.get_param(value = 'svnurl').get('default', defaultUrl))
        
        self.statusbar = self.CreateStatusBar(number = 1)
        
        self.btnFetch = wx.Button(parent = self.panel, id = wx.ID_ANY,
                                  label = _("&Fetch"))
        self.btnFetch.SetToolTipString(_("Fetch list of available modules "
                                         "from GRASS Addons SVN repository"))
        self.btnClose = wx.Button(parent = self.panel, id = wx.ID_CLOSE)
        self.btnInstall = wx.Button(parent = self.panel, id = wx.ID_ANY,
                                    label = _("&Install"))
        self.btnInstall.SetToolTipString(_("Install selected add-ons GRASS module"))
        self.btnInstall.Enable(False)
        
        self.btnClose.Bind(wx.EVT_BUTTON, lambda evt: self.Close())
        self.btnFetch.Bind(wx.EVT_BUTTON, self.OnFetch)
        self.btnInstall.Bind(wx.EVT_BUTTON, self.OnInstall)
        self.tree.selectionChanged.connect(self.OnItemSelected)
        self.tree.itemActivated.connect(self.OnItemActivated)

        wx.CallAfter(self._fetch)
        
        self._layout()

    def _layout(self):
        """!Do layout"""
        sizer = wx.BoxSizer(wx.VERTICAL)
        repoSizer = wx.StaticBoxSizer(self.repoBox, wx.VERTICAL)
        repo1Sizer = wx.BoxSizer(wx.HORIZONTAL)
        repo1Sizer.Add(item = self.repo, proportion = 1,
                      flag = wx.ALL | wx.ALIGN_CENTER_VERTICAL, border = 1)
        repo1Sizer.Add(item = self.btnFetch, proportion = 0,
                      flag = wx.ALL | wx.ALIGN_CENTER_VERTICAL, border = 1)
        repoSizer.Add(item = repo1Sizer,
                      flag = wx.EXPAND)
        
        findSizer = wx.BoxSizer(wx.HORIZONTAL)
        findSizer.Add(item = self.search, proportion = 1)
        
        treeSizer = wx.StaticBoxSizer(self.treeBox, wx.HORIZONTAL)
        treeSizer.Add(item = self.tree, proportion = 1,
                      flag = wx.ALL | wx.EXPAND, border = 1)

        # options
        optionSizer = wx.StaticBoxSizer(self.optionBox, wx.VERTICAL)
        for key in self.options.keys():
            optionSizer.Add(item = self.options[key], proportion = 0)
        
        btnSizer = wx.BoxSizer(wx.HORIZONTAL)
        btnSizer.Add(item = self.btnClose, proportion = 0,
                     flag = wx.RIGHT, border = 5)
        btnSizer.Add(item = self.btnInstall, proportion = 0)
        
        sizer.Add(item = repoSizer, proportion = 0,
                  flag = wx.ALL | wx.EXPAND, border = 3)
        sizer.Add(item = findSizer, proportion = 0,
                  flag = wx.LEFT | wx.RIGHT | wx.BOTTOM | wx.EXPAND, border = 3)
        sizer.Add(item = treeSizer, proportion = 1,
                  flag = wx.LEFT | wx.RIGHT | wx.BOTTOM | wx.EXPAND, border = 3)
        sizer.Add(item = optionSizer, proportion = 0,
                        flag = wx.LEFT | wx.RIGHT | wx.BOTTOM | wx.EXPAND, border = 3)
        sizer.Add(item = btnSizer, proportion = 0,
                  flag = wx.ALIGN_RIGHT | wx.ALL, border = 5)
        
        self.panel.SetSizer(sizer)
        sizer.Fit(self.panel)
        
        self.Layout()

    def _getCmd(self):
        item = self.tree.GetSelected()
        if not item or 'command' not in item[0].data:
            GError(_("Extension not defined"), parent = self)
            return

        name = item[0].data['command']
        
        flags = list()
        for key in self.options.keys():
            if self.options[key].IsChecked():
                if len(key) == 1:
                    flags.append('-%s' % key)
                else:
                    flags.append('--%s' % key)
        
        return ['g.extension'] + flags + ['extension=' + name,
                                          'svnurl=' + self.repo.GetValue().strip()]

    def OnFetch(self, event):
        """!Fetch list of available extensions"""
        self._fetch()

    def _fetch(self):
        """!Fetch list of available extensions"""
        wx.BeginBusyCursor()
        self.SetStatusText(_("Fetching list of modules from GRASS-Addons SVN (be patient)..."), 0)
        self.modelBuilder.Load(url = self.repo.GetValue().strip())
        self.tree.RefreshItems()
        self.SetStatusText("", 0)
        wx.EndBusyCursor()

    def OnItemActivated(self, node):
        data = node.data
        if data and 'command' in data:
            self.OnInstall(event=None)
        
    def OnInstall(self, event):
        """!Install selected extension"""
        log = self.parent.GetLogWindow()
        cmd = self._getCmd()
        if cmd:
            log.RunCmd(cmd, onDone = self.OnDone)
        
    def OnDone(self, cmd, returncode):
        if returncode == 0:
            if not os.getenv('GRASS_ADDON_BASE'):
                SetAddOnPath(key = 'BASE')
            
            globalvar.UpdateGRASSAddOnCommands()

    def OnItemSelected(self, node):
        """!Item selected"""
        data = node.data
        if data is None:
            self.SetStatusText('', 0)
            self.btnInstall.Enable(False)
        else:
            self.SetStatusText(data.get('description', ''), 0)
            self.btnInstall.Enable(True)


class ExtensionTreeModelBuilder:
    """!Tree model of available extensions."""
    def __init__(self):
        self.mainNodes = dict()
        self.model = TreeModel(ModuleNode)
        for prefix in ('display', 'database',
                       'general', 'imagery',
                       'misc', 'postscript', 'paint',
                       'raster', 'raster3D', 'sites', 'vector', 'wxGUI', 'other'):
            node = self.model.AppendNode(parent=self.model.root, label=prefix)
            self.mainNodes[prefix] = node
        
    def GetModel(self):
        return self.model

    def _emptyTree(self):
        """!Remove modules from tree keeping the main structure"""
        for node in self.mainNodes.values():
            for child in reversed(node.children):
                self.model.RemoveNode(child)
        
    def _expandPrefix(self, c):
        name = { 'd'  : 'display',
                 'db' : 'database',
                 'g'  : 'general',
                 'i'  : 'imagery',
                 'm'  : 'misc',
                 'ps' : 'postscript',
                 'p'  : 'paint',
                 'r'  : 'raster',
                 'r3' : 'raster3D',
                 's'  : 'sites',
                 'v'  : 'vector',
                 'wx' : 'wxGUI',
                 ''   : 'other' }
        
        if c in name:
            return name[c]
        
        return c
    
    def Load(self, url, full = True):
        """!Load list of extensions"""
        self._emptyTree()
        
        if full:
            flags = 'g'
        else:
            flags = 'l'
        ret = RunCommand('g.extension', read = True, parent = self,
                         svnurl = url,
                         flags = flags, quiet = True)
        if not ret:
            return
        
        currentNode = None
        for line in ret.splitlines():
            if full:
                try:
                    key, value = line.split('=', 1)
                except ValueError:
                    key = 'name'
                    value = line

                if key == 'name':
                    try:
                        prefix, name = value.split('.', 1)
                    except ValueError:
                        prefix = ''
                        name = value
                    mainNode = self.mainNodes[self._expandPrefix(prefix)]
                    currentNode = self.model.AppendNode(parent=mainNode, label=value)
                    currentNode.data = {'command': value}
                else:
                    if currentNode is not None:
                        currentNode.data[key] = value
            else:
                try:
                    prefix, name = line.strip().split('.', 1)
                except ValueError:
                    prefix = ''
                    name = line.strip()
                
                if self._expandPrefix(prefix) == prefix:
                    prefix = ''
                module = prefix + '.' + name
                mainNode = self.mainNodes[self._expandPrefix(prefix)]
                currentNode = self.model.AppendNode(parent=mainNode, label=module)
                currentNode.data = {'command': module,
                                    'keywords': '',
                                    'description': ''}        


class UninstallExtensionWindow(wx.Frame):
    def __init__(self, parent, id = wx.ID_ANY,
                 title = _("Uninstall GRASS Addons extensions"), **kwargs):
        self.parent = parent
        
        wx.Frame.__init__(self, parent = parent, id = id, title = title, **kwargs)
        self.SetIcon(wx.Icon(os.path.join(globalvar.ETCICONDIR, 'grass.ico'), wx.BITMAP_TYPE_ICO))
        
        self.panel = wx.Panel(parent = self, id = wx.ID_ANY)

        self.extBox = wx.StaticBox(parent = self.panel, id = wx.ID_ANY,
                                   label = " %s " % _("List of installed extensions"))
        
        self.extList = CheckListExtension(parent = self.panel)

        # buttons
        self.btnUninstall = wx.Button(parent = self.panel, id = wx.ID_ANY,
                                    label = _("&Uninstall"))
        self.btnUninstall.SetToolTipString(_("Uninstall selected AddOns extensions"))
        self.btnClose = wx.Button(parent = self.panel, id = wx.ID_CLOSE)
        
        self.btnUninstall.Bind(wx.EVT_BUTTON, self.OnUninstall)
        self.btnClose.Bind(wx.EVT_BUTTON, lambda evt: self.Close())
        
        self._layout()
        
    def _layout(self):
        """!Do layout"""
        sizer = wx.BoxSizer(wx.VERTICAL)
        
        extSizer = wx.StaticBoxSizer(self.extBox, wx.HORIZONTAL)
        extSizer.Add(item = self.extList, proportion = 1,
                     flag = wx.ALL | wx.EXPAND, border = 1)
        
        btnSizer = wx.BoxSizer(wx.HORIZONTAL)
        btnSizer.Add(item = self.btnClose, proportion = 0,
                     flag = wx.RIGHT, border = 5)
        btnSizer.Add(item = self.btnUninstall, proportion = 0)
        
        sizer.Add(item = extSizer, proportion = 1,
                  flag = wx.ALL | wx.EXPAND, border = 3)
        sizer.Add(item = btnSizer, proportion = 0,
                  flag = wx.ALIGN_RIGHT | wx.ALL, border = 5)
        
        self.panel.SetSizer(sizer)
        sizer.Fit(self.panel)
        
        self.Layout()

    def OnUninstall(self, event):
        """!Uninstall selected extensions"""
        eList = self.extList.GetExtensions()
        if not eList:
            GError(_("No extension selected for removal. "
                     "Operation canceled."),
                   parent = self)
            return
        
        for ext in eList:
            files = RunCommand('g.extension', parent = self, read = True, quiet = True,
                               extension = ext, operation = 'remove').splitlines()
            dlg = wx.MessageDialog(parent = self,
                                   message = _("List of files to be removed:\n%(files)s\n\n"
                                               "Do you want really to remove <%(ext)s> extension?") % \
                                       { 'files' : os.linesep.join(files), 'ext' : ext },
                                   caption = _("Remove extension"),
                                   style = wx.YES_NO | wx.NO_DEFAULT | wx.ICON_QUESTION)
            
            if dlg.ShowModal() ==  wx.ID_YES:
                RunCommand('g.extension', flags = 'f', parent = self, quiet = True,
                           extension = ext, operation = 'remove')
        
        self.extList.LoadData()
        
        # update prompt
        globalvar.UpdateGRASSAddOnCommands(eList)

        
class CheckListExtension(GListCtrl):
    """!List of mapset/owner/group"""
    def __init__(self, parent):
        GListCtrl.__init__(self, parent)
        
        # load extensions
        self.InsertColumn(0, _('Extension'))
        self.LoadData()
        
    def LoadData(self):
        """!Load data into list"""
        self.DeleteAllItems()
        for ext in RunCommand('g.extension',
                              quiet = True, parent = self, read = True,
                              flags = 'a').splitlines():
            if ext:
                self.InsertStringItem(sys.maxint, ext)

    def GetExtensions(self):
        """!Get extensions to be un-installed
        """
        extList = list()
        for i in range(self.GetItemCount()):
            if self.IsChecked(i):
                name = self.GetItemText(i)
                if name:
                    extList.append(name)
        
        return extList
