# cerbero - a multi-platform build system for Open Source software
# Copyright (C) 2012 Andoni Morales Alastruey <ylatuya@gmail.com>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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
# Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.

import os
import shutil
import sys
try:
    import sysconfig
except:
    from distutils import sysconfig
try:
    import xml.etree.cElementTree as etree
except ImportError:
    from lxml import etree
import gettext
import platform as pplatform
import re

from cerbero.enums import Platform, Architecture, Distro, DistroVersion
from cerbero.errors import FatalError
from cerbero.utils import messages as m

_ = gettext.gettext
N_ = lambda x: x


class ArgparseArgument(object):

    def __init__(self, *name, **kwargs):
        self.name = name
        self.args = kwargs

    def add_to_parser(self, parser):
        parser.add_argument(*self.name, **self.args)


def user_is_root():
        ''' Check if the user running the process is root '''
        return hasattr(os, 'getuid') and os.getuid() == 0


def determine_num_of_cpus():
    ''' Number of virtual or physical CPUs on this system '''

    # Python 2.6+
    try:
        import multiprocessing
        return multiprocessing.cpu_count()
    except (ImportError, NotImplementedError):
        return 1


def to_winpath(path):
    if path.startswith('/'):
        path = '%s:%s' % (path[1], path[2:])
    return path.replace('/', '\\')


def to_unixpath(path):
    if path[1] == ':':
        path = '/%s%s' % (path[0], path[2:])
    return path


def to_winepath(path):
        path = path.replace('/', '\\\\')
        # wine maps the filesystem root '/' to 'z:\'
        path = 'z:\\%s' % path
        return path


def fix_winpath(path):
    return path.replace('\\', '/')


def system_info():
    '''
    Get the sysem information.
    Return a tuple with the platform type, the architecture and the
    distribution
    '''

    # Get the platform info
    platform = sys.platform
    if platform.startswith('win'):
        platform = Platform.WINDOWS
    elif platform.startswith('darwin'):
        platform = Platform.DARWIN
    elif platform.startswith('linux'):
        platform = Platform.LINUX
    else:
        raise FatalError(_("Platform %s not supported") % platform)

    # Get the architecture info
    if platform == Platform.WINDOWS:
        platform_str = sysconfig.get_platform()
        if platform_str in ['win-amd64', 'win-ia64']:
            arch = Architecture.X86_64
        else:
            arch = Architecture.X86
    else:
        uname = os.uname()
        arch = uname[4]
        if arch == 'x86_64':
            arch = Architecture.X86_64
        elif arch.endswith('86'):
            arch = Architecture.X86
        else:
            raise FatalError(_("Architecture %s not supported") % arch)

    # Get the distro info
    if platform == Platform.LINUX:
        d = pplatform.linux_distribution()
        if d[0] in ['Ubuntu', 'debian', 'LinuxMint']:
            distro = Distro.DEBIAN
            if d[2] in ['maverick', 'isadora']:
                distro_version = DistroVersion.UBUNTU_MAVERICK
            elif d[2] in ['lucid', 'julia']:
                distro_version = DistroVersion.UBUNTU_LUCID
            elif d[2] in ['natty', 'katya']:
                distro_version = DistroVersion.UBUNTU_NATTY
            elif d[2] in ['oneiric', 'lisa']:
                distro_version = DistroVersion.UBUNTU_ONEIRIC
            elif d[2] in ['precise', 'maya']:
                distro_version = DistroVersion.UBUNTU_PRECISE
            elif d[2] in ['quantal', 'nadia']:
                distro_version = DistroVersion.UBUNTU_QUANTAL
            elif d[2] in ['raring', 'olivia']:
                distro_version = DistroVersion.UBUNTU_RARING
            elif d[2] in ['saucy', 'petra']:
                distro_version = DistroVersion.UBUNTU_SAUCY
            elif d[2] in ['trusty', 'qiana']:
                distro_version = DistroVersion.UBUNTU_TRUSTY
            elif d[2] in ['utopic']:
                distro_version = DistroVersion.UBUNTU_UTOPIC
            elif d[1].startswith('6.'):
                distro_version = DistroVersion.DEBIAN_SQUEEZE
            elif d[1].startswith('7.') or d[1].startswith('wheezy'):
                distro_version = DistroVersion.DEBIAN_WHEEZY
            elif d[1].startswith('8.') or d[1].startswith('jessie'):
                distro_version = DistroVersion.DEBIAN_JESSIE
            else:
                raise FatalError("Distribution '%s' not supported" % str(d))
        elif d[0] in ['RedHat', 'Fedora', 'CentOS', 'Red Hat Enterprise Linux Server', 'CentOS Linux']:
            distro = Distro.REDHAT
            if d[1] == '16':
                distro_version = DistroVersion.FEDORA_16
            elif d[1] == '17':
                distro_version = DistroVersion.FEDORA_17
            elif d[1] == '18':
                distro_version = DistroVersion.FEDORA_18
            elif d[1] == '19':
                distro_version = DistroVersion.FEDORA_19
            elif d[1] == '20':
                distro_version = DistroVersion.FEDORA_20
            elif d[1] == '21':
                distro_version = DistroVersion.FEDORA_21
            elif d[1].startswith('6.'):
                distro_version = DistroVersion.REDHAT_6
            elif d[1].startswith('7.'):
                distro_version = DistroVersion.REDHAT_7
            else:
                # FIXME Fill this
                raise FatalError("Distribution '%s' not supported" % str(d))
        elif d[0].strip() in ['openSUSE']:
            distro = Distro.SUSE
            if d[1] == '12.1':
                distro_version = DistroVersion.OPENSUSE_12_1
            elif d[1] == '12.2':
                distro_version = DistroVersion.OPENSUSE_12_2
            elif d[1] == '12.3':
                distro_version = DistroVersion.OPENSUSE_12_3
            else:
                # FIXME Fill this
                raise FatalError("Distribution OpenSuse '%s' "
                                 "not supported" % str(d))
        else:
            raise FatalError("Distribution '%s' not supported" % str(d))
    elif platform == Platform.WINDOWS:
        distro = Distro.WINDOWS
        win32_ver = pplatform.win32_ver()[0]
        dmap = {'xp': DistroVersion.WINDOWS_XP,
                'vista': DistroVersion.WINDOWS_VISTA,
                '7': DistroVersion.WINDOWS_7,
                'post2008Server': DistroVersion.WINDOWS_8,
                '8': DistroVersion.WINDOWS_8}
        if win32_ver in dmap:
            distro_version = dmap[win32_ver]
        else:
            raise FatalError("Windows version '%s' not supported" % win32_ver)
    elif platform == Platform.DARWIN:
        distro = Distro.OS_X
        ver = pplatform.mac_ver()[0]
        if ver.startswith('10.10'):
            distro_version = DistroVersion.OS_X_YOSEMITE
        elif ver.startswith('10.9'):
            distro_version = DistroVersion.OS_X_MAVERICKS
        elif ver.startswith('10.8'):
            distro_version = DistroVersion.OS_X_MOUNTAIN_LION
        else:
            raise FatalError("Mac version %s not supported" % ver)

    num_of_cpus = determine_num_of_cpus()

    return platform, arch, distro, distro_version, num_of_cpus


def validate_packager(packager):
    # match packager in the form 'Name <email>'
    expr = r'(.*\s)*[<]([a-zA-Z0-9+_\-\.]+@'\
        '[0-9a-zA-Z][.-0-9a-zA-Z]*.[a-zA-Z]+)[>]$'
    return bool(re.match(expr, packager))


def copy_files(origdir, destdir, files, extensions, target_platform):
    for f in files:
        f = f % extensions
        install_dir = os.path.dirname(os.path.join(destdir, f))
        if not os.path.exists(install_dir):
            os.makedirs(install_dir)
        if destdir[1] == ':':
            # windows path
            relprefix = to_unixpath(destdir)[2:]
        else:
            relprefix = destdir[1:]
        orig = os.path.join(origdir, relprefix, f)
        dest = os.path.join(destdir, f)
        m.action("copying %s to %s" % (orig, dest))
        try:
            shutil.copy(orig, dest)
        except IOError:
            m.warning("Could not copy %s to %s" % (orig, dest))


def remove_list_duplicates(seq):
    ''' Remove list duplicates maintaining the order '''
    seen = set()
    seen_add = seen.add
    return [x for x in seq if x not in seen and not seen_add(x)]


def parse_file(filename, dict):
    try:
        execfile(filename, dict)
    except Exception, ex:
        import traceback
        traceback.print_exc()
        raise ex


def escape_path(path):
    path = path.replace('\\', '/')
    path = path.replace('(', '\\\(').replace(')', '\\\)')
    path = path.replace(' ', '\\\\ ')
    return path


def get_wix_prefix():
    if 'WIX' in os.environ:
        wix_prefix = os.path.join(os.environ['WIX'], 'bin')
    else:
        wix_prefix = 'C:/Program Files%s/Windows Installer XML v3.5/bin'
        if not os.path.exists(wix_prefix):
            wix_prefix = wix_prefix % ' (x86)'
    if not os.path.exists(wix_prefix):
        raise FatalError("The required packaging tool 'WiX' was not found")
    return escape_path(to_unixpath(wix_prefix))

def add_system_libs(config, new_env):
    '''
    Add /usr/lib/pkgconfig to PKG_CONFIG_PATH so the system's .pc file
    can be found.
    '''
    arch = config.target_arch
    libdir = 'lib'
    if arch == Architecture.X86:
        arch = 'i386'
    else:
        if config.distro == Distro.REDHAT:
            libdir = 'lib64'
    search_paths = [os.environ['PKG_CONFIG_LIBDIR'],
        '/usr/%s/pkgconfig' % libdir, '/usr/share/pkgconfig',
        '/usr/lib/%s-linux-gnu/pkgconfig' % arch]
    new_env['PKG_CONFIG_PATH'] = ':'.join(search_paths)
