# -*- coding: utf-8; Mode: Python; indent-tabs-mode: nil; tab-width: 4 -*-

# Copyright (C) 2013 Canonical Ltd.
# Written by Evan Dandrea <evan.dandrea@canonical.com>
#
# 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 St, Fifth Floor, Boston, MA  02110-1301  USA

from __future__ import print_function

import os
import subprocess
import sys

from ubiquity import i18n, misc, osextras, plugin, upower, validation
from ubiquity.install_misc import archdetect, is_secure_boot

NAME = 'prepare'
AFTER = 'wireless'
WEIGHT = 11
OEM = False


# TODO: This cannot be a non-debconf plugin after all as OEMs may want to
# preseed the 'install updates' and 'install non-free software' options.  So?
# Just db_get them.  No need for any other overhead, surely.  Actually, you
# need the dbfilter for that get.

class PreparePageBase(plugin.PluginUI):
    plugin_title = 'ubiquity/text/prepare_heading_label'

    def __init__(self, *args, **kwargs):
        plugin.PluginUI.__init__(self)

    def plugin_set_online_state(self, state):
        self.prepare_network_connection.set_state(state)
        self.enable_download_updates(state)
        if not state:
            self.set_download_updates(False)

    def set_sufficient_space(self, state, required, free):
        if not state:
            # There's either no drives present, or not enough free space.
            # Either way, we cannot continue.
            self.show_insufficient_space_page(required, free)
            self.controller.allow_go_forward(False)
        self.prepare_sufficient_space.set_state(state)

    def plugin_translate(self, lang):
        return


class PageGtk(PreparePageBase):
    restricted_package_name = 'ubuntu-restricted-addons'

    def __init__(self, controller, *args, **kwargs):
        if self.is_automatic:
            self.page = None
            return
        self.controller = controller
        from ubiquity.gtkwidgets import Builder
        builder = Builder()
        self.controller.add_builder(builder)
        builder.add_from_file(os.path.join(
            os.environ['UBIQUITY_GLADE'], 'stepPrepare.ui'))
        builder.connect_signals(self)

        # Get all objects + add internal child(s)
        all_widgets = builder.get_object_ids()
        for wdg in all_widgets:
            setattr(self, wdg, builder.get_object(wdg))

        self.password_strength_pages = {
            'empty': 0,
            'too_short': 1,
            'weak': 2,
            'fair': 3,
            'good': 4,
            'strong': 5,
        }
        self.password_match_pages = {
            'empty': 0,
            'mismatch': 1,
            'ok': 2,
        }

        if upower.has_battery():
            upower.setup_power_watch(self.prepare_power_source)
        else:
            self.prepare_power_source.hide()
        self.prepare_network_connection = builder.get_object(
            'prepare_network_connection')

        self.using_secureboot = False

        self.secureboot_box.set_sensitive(False)
        self.password_grid.set_sensitive(False)

        self.prepare_page = builder.get_object('stepPrepare')
        self.insufficient_space_page = builder.get_object('stepNoSpace')
        self.current_page = self.prepare_page
        self.plugin_widgets = self.prepare_page
        self.plugin_optional_widgets = [self.insufficient_space_page]

    def plugin_get_current_page(self):
        return self.current_page

    def show_insufficient_space_page(self, required, free):
        self.current_page = self.insufficient_space_page

        self.label_required_space.set_label(required)
        self.label_free_space.set_label(free)

        self.controller.go_to_page(self.current_page)

    def set_using_secureboot(self, secureboot):
        self.using_secureboot = secureboot
        self.secureboot_box.set_visible(secureboot)
        self.on_nonfree_toggled(None)

    def enable_download_updates(self, val):
        if (val):
            template = 'ubiquity/text/label_download_updates'
        else:
            template = 'ubiquity/text/label_download_updates_na'
        self.label_download_updates.set_label(
            self.controller.get_string(template))
        self.prepare_download_updates.set_sensitive(val)

    def set_download_updates(self, val):
        self.prepare_download_updates.set_active(val)

    def get_download_updates(self):
        return self.prepare_download_updates.get_active()

    def set_allow_nonfree(self, allow):
        if not allow:
            self.prepare_nonfree_software.set_active(False)
            self.prepare_nonfree_software.set_property('visible', False)
            self.prepare_foss_disclaimer_extra.set_property('visible', False)

    def set_use_nonfree(self, val):
        if osextras.find_on_path('ubuntu-drivers'):
            self.prepare_nonfree_software.set_active(val)
        else:
            self.debug('Could not find ubuntu-drivers on the executable path.')
            self.set_allow_nonfree(False)

    def get_use_nonfree(self):
        return self.prepare_nonfree_software.get_active()

    def get_disable_secureboot(self):
        return self.disable_secureboot.get_active()

    def plugin_translate(self, lang):
        PreparePageBase.plugin_translate(self, lang)
        release = misc.get_release()

        from gi.repository import Gtk
        for widget in [self.prepare_download_updates,
                       self.label_required_space,
                       self.label_free_space]:
            text = i18n.get_string(Gtk.Buildable.get_name(widget), lang)
            text = text.replace('${RELEASE}', release.name)
            widget.set_label(text)

    def on_nonfree_toggled(self, widget):
        enabled = self.get_use_nonfree()
        self.secureboot_box.set_sensitive(enabled)

    def on_secureboot_toggled(self, widget):
        enabled = self.get_disable_secureboot()
        self.password_grid.set_sensitive(enabled)
        self.info_loop(None)

    def info_loop(self, unused_widget):
        complete = True
        passw = self.password.get_text()
        vpassw = self.verified_password.get_text()

        if passw != vpassw or (passw and len(passw) < 8):
            complete = False
            self.password_match.set_current_page(
                self.password_match_pages['empty'])
            if passw and (not passw.startswith(vpassw) or
                          len(vpassw) / len(passw) > 0.8):
                self.password_match.set_current_page(
                    self.password_match_pages['mismatch'])
        else:
            self.password_match.set_current_page(
                self.password_match_pages['ok'])

        if passw:
            txt = validation.human_password_strength(passw)[0]
            self.password_strength.set_current_page(
                self.password_strength_pages[txt])
        else:
            self.password_strength.set_current_page(
                self.password_strength_pages['empty'])

        self.controller.allow_go_forward(complete)
        return complete

    def get_secureboot_key(self):
        return self.password.get_text()

    def show_learn_more(self, unused):
        from gi.repository import Gtk

        sb_title_template = 'ubiquity/text/efi_secureboot'
        sb_info_template = 'ubiquity/text/efi_secureboot_info'
        secureboot_title = self.controller.get_string(sb_title_template)
        secureboot_msg = self.controller.get_string(sb_info_template)

        dialog = Gtk.MessageDialog(
            self.current_page.get_toplevel(), Gtk.DialogFlags.MODAL,
            Gtk.MessageType.INFO, Gtk.ButtonsType.CLOSE, None)
        dialog.set_title(secureboot_title)
        dialog.set_markup(secureboot_msg)
        dialog.run()
        dialog.destroy()


class PageKde(PreparePageBase):
    plugin_breadcrumb = 'ubiquity/text/breadcrumb_prepare'
    restricted_package_name = 'kubuntu-restricted-addons'

    def __init__(self, controller, *args, **kwargs):
        from ubiquity.qtwidgets import StateBox
        if self.is_automatic:
            self.page = None
            return
        self.controller = controller
        try:
            from PyQt4 import uic
            self.page = uic.loadUi('/usr/share/ubiquity/qt/stepPrepare.ui')
            self.prepare_download_updates = self.page.prepare_download_updates
            self.prepare_nonfree_software = self.page.prepare_nonfree_software
            self.prepare_foss_disclaimer = self.page.prepare_foss_disclaimer
            self.prepare_sufficient_space = StateBox(self.page)
            # TODO we should set these up and tear them down while on this
            # page.
            try:
                self.prepare_power_source = StateBox(self.page)
                if upower.has_battery():
                    upower.setup_power_watch(self.prepare_power_source)
                else:
                    self.prepare_power_source.hide()
            except Exception as e:
                # TODO use an inconsistent state?
                print('unable to set up power source watch:', e)
            try:
                self.prepare_network_connection = StateBox(self.page)
            except Exception as e:
                print('unable to set up network connection watch:', e)
        except Exception as e:
            print("Could not create prepare page:", str(e), file=sys.stderr)
            self.debug('Could not create prepare page: %s', e)
            self.page = None
        self.using_secureboot = False
        self.plugin_widgets = self.page

    def show_insufficient_space_page(self, required, free):
        return

    def get_secureboot_key(self):
        # TODO: This needs the controls to set a Secure Boot key.
        # return str(self.password.text())
        return ""

    def enable_download_updates(self, val):
        self.prepare_download_updates.setEnabled(val)

    def set_download_updates(self, val):
        self.prepare_download_updates.setChecked(val)

    def get_download_updates(self):
        from PyQt4.QtCore import Qt
        return self.prepare_download_updates.checkState() == Qt.Checked

    def set_allow_nonfree(self, allow):
        if not allow:
            self.prepare_nonfree_software.setChecked(False)
            self.prepare_nonfree_software.setVisible(False)
            self.prepare_foss_disclaimer.setVisible(False)

    def set_use_nonfree(self, val):
        if osextras.find_on_path('ubuntu-drivers'):
            self.prepare_nonfree_software.setChecked(val)
        else:
            self.debug('Could not find ubuntu-drivers on the executable path.')
            self.set_allow_nonfree(False)

    def get_use_nonfree(self):
        from PyQt4.QtCore import Qt
        return self.prepare_nonfree_software.checkState() == Qt.Checked

    def plugin_translate(self, lang):
        PreparePageBase.plugin_translate(self, lang)
        # gtk does the ${RELEASE} replace for the title in gtk_ui but we do
        # it per plugin because our title widget is per plugin
        release = misc.get_release()
        widgets = (
            self.page.prepare_heading_label,
            self.page.prepare_download_updates,
        )
        for widget in widgets:
            text = widget.text()
            text = text.replace('${RELEASE}', release.name)
            text = text.replace('Ubuntu', 'Kubuntu')
            widget.setText(text)


class Page(plugin.Plugin):
    def prepare(self):
        if (self.db.get('apt-setup/restricted') == 'false' or
                self.db.get('apt-setup/multiverse') == 'false'):
            self.ui.set_allow_nonfree(False)
        else:
            use_nonfree = self.db.get('ubiquity/use_nonfree') == 'true'
            self.ui.set_use_nonfree(use_nonfree)

        arch, subarch = archdetect()
        if 'efi' in subarch:
            if is_secure_boot():
                self.ui.set_using_secureboot(True)

        download_updates = self.db.get('ubiquity/download_updates') == 'true'
        self.ui.set_download_updates(download_updates)
        self.apply_debconf_branding()
        self.setup_sufficient_space()
        command = ['/usr/share/ubiquity/simple-plugins', 'prepare']
        questions = ['ubiquity/use_nonfree']
        return command, questions

    def apply_debconf_branding(self):
        release = misc.get_release()
        for template in ['ubiquity/text/required_space',
                         'ubiquity/text/free_space']:
            self.db.subst(template, 'RELEASE', release.name)

    def setup_sufficient_space(self):
        # TODO move into prepare.
        size = misc.install_size()
        self.db.subst(
            'ubiquity/text/required_space', 'SIZE',
            misc.format_size(size))
        free = self.free_space()
        self.db.subst(
            'ubiquity/text/free_space', 'SIZE',
            misc.format_size(free))
        required_text = self.description('ubiquity/text/required_space')
        free_text = self.description('ubiquity/text/free_space')
        self.ui.set_sufficient_space(size < free, required_text, free_text)

    def free_space(self):
        biggest = 0
        with misc.raised_privileges():
            proc = subprocess.Popen(
                ['parted_devices'],
                stdout=subprocess.PIPE, universal_newlines=True)
            devices = proc.communicate()[0].rstrip('\n').split('\n')
            for device in devices:
                if device and int(device.split('\t')[1]) > biggest:
                    biggest = int(device.split('\t')[1])
        return biggest

    def ok_handler(self):
        download_updates = self.ui.get_download_updates()
        use_nonfree = self.ui.get_use_nonfree()
        secureboot_key = self.ui.get_secureboot_key()
        self.preseed_bool('ubiquity/use_nonfree', use_nonfree)
        self.preseed_bool('ubiquity/download_updates', download_updates)
        if self.ui.using_secureboot and secureboot_key:
            self.preseed('ubiquity/secureboot_key', secureboot_key, seen=True)
        if use_nonfree:
            with misc.raised_privileges():
                # Install ubuntu-restricted-addons.
                self.preseed_bool('apt-setup/universe', True)
                self.preseed_bool('apt-setup/multiverse', True)
                if self.db.fget('ubiquity/nonfree_package', 'seen') != 'true':
                    self.preseed(
                        'ubiquity/nonfree_package',
                        self.ui.restricted_package_name)
        plugin.Plugin.ok_handler(self)
