#
# torrentdetails.py
#
# Copyright (C) 2007 Andrew Resch <andrewresch@gmail.com>
#
# Deluge is free software.
#
# You may redistribute it and/or modify it under the terms of the
# GNU General Public License, as published by the Free Software
# Foundation; either version 3 of the License, or (at your option)
# any later version.
#
# deluge 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 deluge.    If not, write to:
# 	The Free Software Foundation, Inc.,
# 	51 Franklin Street, Fifth Floor
# 	Boston, MA    02110-1301, USA.
#


"""The torrent details component shows info about the selected torrent."""

import gtk, gtk.glade
import os
import os.path
import cPickle

import deluge.component as component
from deluge.ui.client import aclient as client
from deluge.configmanager import ConfigManager

from deluge.log import LOG as log

class Tab:
    def __init__(self):
        self.is_visible = True
        self.position = -1
        self.weight = -1

    def get_name(self):
        return self._name

    def get_child_widget(self):
        parent = self._child_widget.get_parent()
        if parent is not None:
            parent.remove(self._child_widget)

        return self._child_widget

    def get_tab_label(self):
        parent = self._tab_label.get_parent()
        log.debug("parent: %s", parent)
        if parent is not None:
            parent.remove(self._tab_label)

        return self._tab_label

class TorrentDetails(component.Component):
    def __init__(self):
        component.Component.__init__(self, "TorrentDetails", interval=2000)
        self.window = component.get("MainWindow")
        glade = self.window.main_glade

        self.notebook = glade.get_widget("torrent_info")

        # This is the menu item we'll attach the tabs checklist menu to
        self.menu_tabs = glade.get_widget("menu_tabs")

        self.notebook.connect("switch-page", self._on_switch_page)

        # Tabs holds references to the Tab objects by their name
        self.tabs = {}

        # Add the default tabs
        from statistics_tab import StatisticsTab
        from details_tab import DetailsTab
        from files_tab import FilesTab
        from peers_tab import PeersTab
        from options_tab import OptionsTab

        default_tabs = {
            "Statistics": StatisticsTab,
            "Details": DetailsTab,
            "Files": FilesTab,
            "Peers": PeersTab,
            "Options": OptionsTab
            }

        # tab_name, visible
        default_order = [
            ("Statistics", True),
            ("Details", True),
            ("Files", True),
            ("Peers", True),
            ("Options", True)
        ]

        # Get the state from saved file
        state = self.load_state()

        if state:
            for item in state:
                if not isinstance(item, tuple):
                    log.debug("Old tabs.state, using default..")
                    state = None
                    break

        # The state is a list of tab_names in the order they should appear
        if state == None:
            # Set the default order
            state = default_order

        # Add the tabs in the order from the state
        for tab_name, visible in state:
            self.add_tab(default_tabs[tab_name]())

        # Hide any of the non-visible ones
        for tab_name, visible in state:
            if not visible:
                self.hide_tab(tab_name)

        # Generate the checklist menu
        self.generate_menu()

    def add_tab(self, tab_object, position=-1, generate_menu=True):
        """Adds a tab object to the notebook."""
        self.tabs[tab_object.get_name()] = tab_object
        pos = self.notebook.insert_page(
            tab_object.get_child_widget(),
            tab_object.get_tab_label(),
            position)

        tab_object.position = pos
        tab_object.weight = pos

        # Regenerate positions if an insert occured
        if position > -1:
            self.regenerate_positions()

        if generate_menu:
            self.generate_menu()

        if not self.notebook.get_property("visible"):
            # If the notebook isn't visible, show it
            self.visible(True)

    def regenerate_positions(self):
        """This will sync up the positions in the tab, with the position stored
        in the tab object"""
        for tab in self.tabs:
            page_num = self.notebook.page_num(self.tabs[tab]._child_widget)
            if page_num > -1:
                self.tabs[tab].position = page_num

    def remove_tab(self, tab_name):
        """Removes a tab by name."""
        self.notebook.remove_page(self.tabs[tab_name].position)
        del self.tabs[tab_name]
        self.regenerate_positions()
        self.generate_menu()

        # If there are no tabs visible, then do not show the notebook
        if len(self.tabs) == 0:
            self.visible(False)

    def hide_all_tabs(self):
        """Hides all tabs"""
        log.debug("n_pages: %s", self.notebook.get_n_pages())
        for n in xrange(self.notebook.get_n_pages() - 1, -1, -1):
            self.notebook.remove_page(n)

        for tab in self.tabs:
            self.tabs[tab].is_visible = False
        log.debug("n_pages: %s", self.notebook.get_n_pages())
        self.generate_menu()
        self.visible(False)

    def show_all_tabs(self):
        """Shows all tabs"""
        for tab in self.tabs:
            if not self.tabs[tab].is_visible:
                self.notebook.insert_page(
                    self.tabs[tab].get_child_widget(),
                    self.tabs[tab].get_tab_label(),
                    self.tabs[tab].position)
                self.tabs[tab].is_visible = True
        self.generate_menu()
        if not self.notebook.get_property("visible"):
            # If the notebook isn't visible, show it
            self.visible(True)

    def hide_tab(self, tab_name):
        """Hides tab by name"""
        self.notebook.remove_page(self.tabs[tab_name].position)
        self.tabs[tab_name].is_visible = False
        self.regenerate_positions()
        self.generate_menu()

    def show_tab(self, tab_name):
        log.debug("%s\n%s\n%s", self.tabs[tab_name].get_child_widget(),
            self.tabs[tab_name].get_tab_label(),
            self.tabs[tab_name].position)

        # Determine insert position based on weight
        # weights is a list of visible tab names in weight order
        weights = []

        for tab in self.tabs:
            if self.tabs[tab].is_visible:
                weights.append((self.tabs[tab].weight, self.tabs[tab].get_name()))

        weights.sort()
        log.debug("weights: %s", weights)
        position = self.tabs[tab_name].position
        log.debug("weight of tab: %s", self.tabs[tab_name].weight)
        for i, w in enumerate(weights):
            if w[0] >= self.tabs[tab_name].weight:
                position = self.tabs[w[1]].position
                break

        log.debug("position: %s", position)
        self.notebook.insert_page(
            self.tabs[tab_name].get_child_widget(),
            self.tabs[tab_name].get_tab_label(),
            position)
        self.tabs[tab_name].is_visible = True
        self.regenerate_positions()
        self.generate_menu()

    def generate_menu(self):
        """Generates the checklist menu for all the tabs and attaches it"""
        menu = gtk.Menu()
        # Create 'All' menuitem and a separator
        menuitem = gtk.CheckMenuItem("All")

        all_tabs = True
        for key in self.tabs:
            if not self.tabs[key].is_visible:
                all_tabs = False
                break
        menuitem.set_active(all_tabs)
        menuitem.connect("toggled", self._on_menuitem_toggled)

        menu.append(menuitem)

        menuitem = gtk.SeparatorMenuItem()
        menu.append(menuitem)

        # Create a list in order of tabs to create menu
        menuitem_list = []
        for tab_name in self.tabs:
            menuitem_list.append((self.tabs[tab_name].weight, tab_name))
        menuitem_list.sort()

        for pos, name in menuitem_list:
            menuitem = gtk.CheckMenuItem(name)
            menuitem.set_active(self.tabs[name].is_visible)
            menuitem.connect("toggled", self._on_menuitem_toggled)
            menu.append(menuitem)

        self.menu_tabs.set_submenu(menu)
        self.menu_tabs.show_all()

    def visible(self, visible):
        if visible:
            self.notebook.show()
        else:
            self.notebook.hide()
            self.window.vpaned.set_position(-1)

    def set_tab_visible(self, tab_name, visible):
        """Sets the tab to visible"""
        log.debug("set_tab_visible name: %s visible: %s", tab_name, visible)
        if visible and not self.tabs[tab_name].is_visible:
            self.show_tab(tab_name)
        elif not visible and self.tabs[tab_name].is_visible:
            self.hide_tab(tab_name)

    def stop(self):
        self.clear()

    def shutdown(self):
        # Save the state of the tabs
        for tab in self.tabs:
            try:
                self.tabs[tab].save_state()
            except AttributeError:
                pass

        # Save tabs state
        self.save_state()

    def update(self, page_num=None):
        if len(component.get("TorrentView").get_selected_torrents()) == 0:
            # No torrents selected, so just clear
            self.clear()

        if self.notebook.get_property("visible"):
            if page_num == None:
                page_num = self.notebook.get_current_page()
            try:
                # Get the tab name
                name = None
                for tab in self.tabs:
                    if self.tabs[tab].position == page_num and self.tabs[tab].is_visible:
                        name = tab
            except IndexError:
                return
            # Update the tab that is in view
            if name:
                self.tabs[name].update()

    def clear(self):
        # Get the tab name
        try:
            page_num = self.notebook.get_current_page()
            name = None
            for tab in self.tabs:
                if self.tabs[tab].position == page_num and self.tabs[tab].is_visible:
                    name = tab
            if name:
                self.tabs[name].clear()
        except Exception, e:
            log.debug("Unable to clear torrentdetails: %s", e)

    def _on_switch_page(self, notebook, page, page_num):
        self.update(page_num)
        client.force_call(False)

    def _on_menuitem_toggled(self, widget):
        # Get the tab name
        name = widget.get_child().get_text()
        if name == "All":
            if widget.get_active():
                self.show_all_tabs()
            else:
                self.hide_all_tabs()
            return

        self.set_tab_visible(name, widget.get_active())

    def save_state(self):
        """We save the state, which is basically the tab_index list"""
        filename = "tabs.state"
        state = []
        for tab in self.tabs:
            state.append((self.tabs[tab].weight, self.tabs[tab].get_name(),
                self.tabs[tab].is_visible))
        # Sort by weight
        state.sort()
        state = [(n, v) for w, n, v in state]

        # Get the config location for saving the state file
        config_location = ConfigManager("gtkui.conf")["config_location"]

        try:
            log.debug("Saving TorrentDetails state file: %s", filename)
            state_file = open(os.path.join(config_location, filename), "wb")
            cPickle.dump(state, state_file)
            state_file.close()
        except IOError, e:
            log.warning("Unable to save state file: %s", e)

    def load_state(self):
        filename = "tabs.state"
        # Get the config location for loading the state file
        config_location = ConfigManager("gtkui.conf")["config_location"]
        state = None

        try:
            log.debug("Loading TorrentDetails state file: %s", filename)
            state_file = open(os.path.join(config_location, filename), "rb")
            state = cPickle.load(state_file)
            state_file.close()
        except (EOFError, IOError), e:
            log.warning("Unable to load state file: %s", e)

        return state