# This file is part of Gajim.
#
# Gajim 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; version 3 only.
#
# Gajim 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 Gajim.  If not, see <http://www.gnu.org/licenses/>.

'''
GUI classes related to plug-in management.

:author: Mateusz Biliński <mateusz@bilinski.it>
:since: 6th June 2008
:copyright: Copyright (2008) Mateusz Biliński <mateusz@bilinski.it>
:license: GPL
'''

import os
from enum import IntEnum
from enum import unique

from gi.repository import Gtk
from gi.repository import GdkPixbuf
from gi.repository import Gdk

from gajim.common import app
from gajim.common import configpaths
from gajim.common.exceptions import PluginsystemError

from gajim.plugins.helpers import log_calls
from gajim.plugins.helpers import GajimPluginActivateException
from gajim.plugins.plugins_i18n import _

from gajim.gtk.dialogs import WarningDialog
from gajim.gtk.dialogs import YesNoDialog
from gajim.gtk.filechoosers import ArchiveChooserDialog
from gajim.gtk.util import get_builder
from gajim.gtk.util import load_icon


@unique
class Column(IntEnum):
    PLUGIN = 0
    NAME = 1
    ACTIVE = 2
    ACTIVATABLE = 3
    ICON = 4


class PluginsWindow:
    '''Class for Plugins window'''

    @log_calls('PluginsWindow')
    def __init__(self):
        '''Initialize Plugins window'''
        builder = get_builder('plugins_window.ui')
        self.window = builder.get_object('plugins_window')
        self.window.set_transient_for(app.interface.roster.window)

        widgets_to_extract = ('plugins_notebook', 'plugin_name_label',
            'plugin_version_label', 'plugin_authors_label',
            'plugin_homepage_linkbutton', 'uninstall_plugin_button',
            'configure_plugin_button', 'installed_plugins_treeview',
            'available_text', 'available_text_label')

        for widget_name in widgets_to_extract:
            setattr(self, widget_name, builder.get_object(widget_name))

        self.plugin_description_textview = builder.get_object('description')
        self.installed_plugins_model = Gtk.ListStore(object, str, bool, bool,
            GdkPixbuf.Pixbuf)
        self.installed_plugins_treeview.set_model(self.installed_plugins_model)

        renderer = Gtk.CellRendererText()
        col = Gtk.TreeViewColumn(_('Plugin'))#, renderer, text=Column.NAME)
        cell = Gtk.CellRendererPixbuf()
        col.pack_start(cell, False)
        col.add_attribute(cell, 'pixbuf', Column.ICON)
        col.pack_start(renderer, True)
        col.add_attribute(renderer, 'text', Column.NAME)
        col.set_property('expand', True)
        self.installed_plugins_treeview.append_column(col)

        renderer = Gtk.CellRendererToggle()
        renderer.connect('toggled', self.installed_plugins_toggled_cb)
        col = Gtk.TreeViewColumn(_('Active'), renderer, active=Column.ACTIVE,
            activatable=Column.ACTIVATABLE)
        self.installed_plugins_treeview.append_column(col)

        self.def_icon = load_icon('preferences-desktop',
                                  self.window,
                                  pixbuf=True)

        # connect signal for selection change
        selection = self.installed_plugins_treeview.get_selection()
        selection.connect('changed',
            self.installed_plugins_treeview_selection_changed)
        selection.set_mode(Gtk.SelectionMode.SINGLE)

        self._clear_installed_plugin_info()

        self.fill_installed_plugins_model()
        root_iter = self.installed_plugins_model.get_iter_first()
        if root_iter:
            selection.select_iter(root_iter)

        builder.connect_signals(self)

        self.plugins_notebook.set_current_page(0)

        # Adding GUI extension point for Plugins that want to hook the Plugin Window
        app.plugin_manager.gui_extension_point('plugin_window', self)

        self.window.show_all()

    def on_key_press_event(self, widget, event):
        if event.keyval == Gdk.KEY_Escape:
            self.window.destroy()

    @log_calls('PluginsWindow')
    def installed_plugins_treeview_selection_changed(self, treeview_selection):
        model, iter_ = treeview_selection.get_selected()
        if iter_:
            plugin = model.get_value(iter_, Column.PLUGIN)
            self._display_installed_plugin_info(plugin)
        else:
            self._clear_installed_plugin_info()

    def _display_installed_plugin_info(self, plugin):
        self.plugin_name_label.set_text(plugin.name)
        self.plugin_version_label.set_text(plugin.version)
        self.plugin_authors_label.set_text(plugin.authors)
        markup = '<a href="%s">%s</a>' % (plugin.homepage, plugin.homepage)
        self.plugin_homepage_linkbutton.set_markup(markup)

        if plugin.available_text:
            text = _('Warning: %s') % plugin.available_text
            self.available_text_label.set_text(text)
            self.available_text.show()
            # Workaround for https://bugzilla.gnome.org/show_bug.cgi?id=710888
            self.available_text.queue_resize()
        else:
            self.available_text.hide()

        self.plugin_description_textview.set_text(plugin.description)

        self.uninstall_plugin_button.set_property(
            'sensitive', configpaths.get('PLUGINS_USER') in plugin.__path__)
        self.configure_plugin_button.set_property(
            'sensitive', plugin.config_dialog is not None)

    def _clear_installed_plugin_info(self):
        self.plugin_name_label.set_text('')
        self.plugin_version_label.set_text('')
        self.plugin_authors_label.set_text('')
        self.plugin_homepage_linkbutton.set_markup('')

        self.plugin_description_textview.set_text('')
        self.uninstall_plugin_button.set_property('sensitive', False)
        self.configure_plugin_button.set_property('sensitive', False)

    @log_calls('PluginsWindow')
    def fill_installed_plugins_model(self):
        pm = app.plugin_manager
        self.installed_plugins_model.clear()
        self.installed_plugins_model.set_sort_column_id(1, Gtk.SortType.ASCENDING)

        for plugin in pm.plugins:
            icon = self.get_plugin_icon(plugin)
            self.installed_plugins_model.append([plugin, plugin.name,
                plugin.active and plugin.activatable, plugin.activatable, icon])

    def get_plugin_icon(self, plugin):
        icon_file = os.path.join(plugin.__path__, os.path.split(
                plugin.__path__)[1]) + '.png'
        icon = self.def_icon
        if os.path.isfile(icon_file):
            icon = GdkPixbuf.Pixbuf.new_from_file_at_size(icon_file, 16, 16)
        return icon

    @log_calls('PluginsWindow')
    def installed_plugins_toggled_cb(self, cell, path):
        is_active = self.installed_plugins_model[path][Column.ACTIVE]
        plugin = self.installed_plugins_model[path][Column.PLUGIN]

        if is_active:
            app.plugin_manager.deactivate_plugin(plugin)
        else:
            try:
                app.plugin_manager.activate_plugin(plugin)
            except GajimPluginActivateException as e:
                WarningDialog(_('Plugin failed'), str(e),
                    transient_for=self.window)
                return

        self.installed_plugins_model[path][Column.ACTIVE] = not is_active

    @log_calls('PluginsWindow')
    def on_plugins_window_destroy(self, widget):
        '''Close window'''
        app.plugin_manager.remove_gui_extension_point('plugin_window', self)
        del app.interface.instances['plugins']

    @log_calls('PluginsWindow')
    def on_configure_plugin_button_clicked(self, widget):
        selection = self.installed_plugins_treeview.get_selection()
        model, iter_ = selection.get_selected()
        if iter_:
            plugin = model.get_value(iter_, Column.PLUGIN)

            if isinstance(plugin.config_dialog, GajimPluginConfigDialog):
                plugin.config_dialog.run(self.window)
            else:
                plugin.config_dialog(self.window)

        else:
            # No plugin selected. this should never be reached. As configure
            # plugin button should only be clickable when plugin is selected.
            # XXX: maybe throw exception here?
            pass

    @log_calls('PluginsWindow')
    def on_uninstall_plugin_button_clicked(self, widget):
        selection = self.installed_plugins_treeview.get_selection()
        model, iter_ = selection.get_selected()
        if iter_:
            plugin = model.get_value(iter_, Column.PLUGIN)
            try:
                app.plugin_manager.uninstall_plugin(plugin)
            except PluginsystemError as e:
                WarningDialog(_('Unable to properly remove the plugin'),
                    str(e), self.window)
                return
            model.remove(iter_)

    @log_calls('PluginsWindow')
    def on_install_plugin_button_clicked(self, widget):
        def show_warn_dialog():
            text = _('Archive is malformed')
            dialog = WarningDialog(text, '', transient_for=self.window)
            dialog.set_modal(False)
            dialog.popup()

        def _on_plugin_exists(zip_filename):
            def on_yes(is_checked):
                plugin = app.plugin_manager.install_from_zip(zip_filename,
                    True)
                if not plugin:
                    show_warn_dialog()
                    return
                model = self.installed_plugins_model

                for _index, row in enumerate(model):
                    if plugin == row[Column.PLUGIN]:
                        model.remove(row.iter)
                        break

                iter_ = model.append([plugin, plugin.name, False,
                    plugin.activatable, self.get_plugin_icon(plugin)])
                sel = self.installed_plugins_treeview.get_selection()
                sel.select_iter(iter_)

            YesNoDialog(_('Plugin already exists'), sectext=_('Overwrite?'),
                on_response_yes=on_yes, transient_for=self.window)

        def _try_install(zip_filename):
            try:
                plugin = app.plugin_manager.install_from_zip(zip_filename)
            except PluginsystemError as er_type:
                error_text = str(er_type)
                if error_text == _('Plugin already exists'):
                    _on_plugin_exists(zip_filename)
                    return

                WarningDialog(error_text, '"%s"' % zip_filename, self.window)
                return
            if not plugin:
                show_warn_dialog()
                return
            model = self.installed_plugins_model
            iter_ = model.append([plugin, plugin.name, False,
                plugin.activatable, self.get_plugin_icon(plugin)])
            sel = self.installed_plugins_treeview.get_selection()
            sel.select_iter(iter_)

        ArchiveChooserDialog(_try_install, transient_for=self.window)


class GajimPluginConfigDialog(Gtk.Dialog):

    @log_calls('GajimPluginConfigDialog')
    def __init__(self, plugin, **kwargs):
        Gtk.Dialog.__init__(self, title='%s %s'%(plugin.name,
            _('Configuration')), **kwargs)
        self.plugin = plugin
        button = self.add_button('gtk-close', Gtk.ResponseType.CLOSE)
        button.connect('clicked', self.on_close_button_clicked)

        self.get_child().set_spacing(3)

        self.init()

    def on_close_dialog(self, widget, data):
        self.hide()
        return True

    def on_close_button_clicked(self, widget):
        self.hide()

    @log_calls('GajimPluginConfigDialog')
    def run(self, parent=None):
        self.set_transient_for(parent)
        self.on_run()
        self.show_all()
        self.connect('delete-event', self.on_close_dialog)
        result = super(GajimPluginConfigDialog, self)
        return result

    def init(self):
        pass

    def on_run(self):
        pass