# vim: ts=4:sw=4:expandtab

# BleachBit
# Copyright (C) 2008-2016 Andrew Ziem
# http://www.bleachbit.org
#
# 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 3 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, see <http://www.gnu.org/licenses/>.


"""
Check for updates via the Internet
"""


import hashlib
import logging
import os
import os.path
import platform
import socket
import sys
import traceback
import urllib2
import xml.dom.minidom

import Common
from Common import _


def update_winapp2(url, hash_expected, append_text, cb_success):
    """Download latest winapp2.ini file.  Hash is sha512 or None to disable checks"""
    # first, determine whether an update is necessary
    from Common import personal_cleaners_dir
    fn = os.path.join(personal_cleaners_dir, 'winapp2.ini')
    delete_current = False
    if os.path.exists(fn):
        f = open(fn, 'r')
        hash_current = hashlib.sha512(f.read()).hexdigest()
        if not hash_expected or hash_current == hash_expected:
            # update is same as current
            return
        f.close()
        delete_current = True
    # download update
    opener = urllib2.build_opener()
    opener.addheaders = [('User-Agent', user_agent())]
    kwargs = {'fullurl': url}
    if sys.hexversion >= 0x02060000:
        # Python 2.6 added timeout option
        kwargs['timeout'] = 20
    doc = opener.open(**kwargs).read()
    # verify hash
    hash_actual = hashlib.sha512(doc).hexdigest()
    if hash_expected and not hash_actual == hash_expected:
        raise RuntimeError("hash for %s actually %s instead of %s" %
                           (url, hash_actual, hash_expected))
    # delete current
    if delete_current:
        from FileUtilities import delete
        delete(fn, True)
    # write file
    if not os.path.exists(personal_cleaners_dir):
        os.mkdir(personal_cleaners_dir)
    f = open(fn, 'w')
    f.write(doc)
    append_text(_('New winapp2.ini was downloaded.'))
    cb_success()


def user_agent():
    """Return the user agent string"""
    __platform = platform.system()  # Linux or Windows
    __os = platform.uname()[2]  # e.g., 2.6.28-12-generic or XP
    if sys.platform == "win32":
        # misleading: Python 2.5.4 shows uname()[2] as Vista on Windows 7
        __os = platform.uname()[3][
            0:3]  # 5.1 = Windows XP, 6.0 = Vista, 6.1 = 7
    elif sys.platform.startswith('linux'):
        dist = platform.dist()
        # example: ('fedora', '11', 'Leonidas')
        # example: ('', '', '') for Arch Linux
        if 0 < len(dist[0]):
            __os = dist[0] + '/' + dist[1] + '-' + dist[2]
    elif sys.platform[:6] == 'netbsd':
        __sys = platform.system()
        mach = platform.machine()
        rel = platform.release()
        __os = __sys + '/' + mach + ' ' + rel
    __locale = ""
    try:
        import locale
        __locale = locale.getdefaultlocale()[0]  # e.g., en_US
    except:
        logger = logging.getLogger(__name__)
        logger.exception('Exception when getting default locale')

    try:
        import gtk
        gtkver = '; GTK %s' % '.'.join([str(x) for x in gtk.gtk_version])
    except:
        gtkver = ""

    agent = "BleachBit/%s (%s; %s; %s%s)" % (Common.APP_VERSION,
                                             __platform, __os, __locale, gtkver)
    return agent


def update_dialog(parent, updates):
    """Updates contains the version numbers and URLs"""
    import gtk
    from GuiBasic import open_url
    dlg = gtk.Dialog(title=_("Update BleachBit"),
                     parent=parent,
                     flags=gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT)
    dlg.set_default_size(250, 125)

    label = gtk.Label(_("A new version is available."))
    dlg.vbox.pack_start(label)

    for update in updates:
        ver = update[0]
        url = update[1]
        box_update = gtk.HBox()
        # TRANSLATORS: %s expands to version such as '0.8.4' or '0.8.5beta' or
        # similar
        button_stable = gtk.Button(_("Update to version %s") % ver)
        button_stable.connect(
            'clicked', lambda dummy: open_url(url, parent, False))
        button_stable.connect('clicked', lambda dummy: dlg.response(0))
        box_update.pack_start(button_stable, False, padding=10)
        dlg.vbox.pack_start(box_update, False)

    dlg.add_button(gtk.STOCK_CLOSE, gtk.RESPONSE_CLOSE)

    dlg.show_all()
    dlg.run()
    dlg.destroy()

    return False


def check_updates(check_beta, check_winapp2, append_text, cb_success):
    """Check for updates via the Internet"""
    opener = urllib2.build_opener()
    socket.setdefaulttimeout(Common.socket_timeout)
    opener.addheaders = [('User-Agent', user_agent())]
    logger = logging.getLogger(__name__)
    try:
        handle = opener.open(Common.update_check_url)
    except urllib2.URLError:
        logger.exception(
            _('Error when opening a network connection to %s to check for updates. Please verify the network is working.' %
                Common.update_check_url))
        return ()
    doc = handle.read()
    try:
        dom = xml.dom.minidom.parseString(doc)
    except:
        logger.exception('The update information does not parse: %s' % doc)
        return ()

    def parse_updates(element):
        if element:
            ver = element[0].getAttribute('ver')
            url = element[0].firstChild.data
            return (ver, url)
        return ()

    stable = parse_updates(dom.getElementsByTagName("stable"))
    beta = parse_updates(dom.getElementsByTagName("beta"))

    wa_element = dom.getElementsByTagName('winapp2')
    if check_winapp2 and wa_element:
        wa_sha512 = wa_element[0].getAttribute('sha512')
        wa_url = wa_element[0].getAttribute('url')
        update_winapp2(wa_url, wa_sha512, append_text, cb_success)

    dom.unlink()

    if stable and beta and check_beta:
        return (stable, beta)
    if stable:
        return (stable,)
    if beta and check_beta:
        return (beta,)
    return ()
