#!/usr/bin/env python
# Copyright (C) 2011 Igalia S.L.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

import os
import subprocess
import sys

script_dir = None
build_dir = None


def script_path(*args):
    global script_dir
    if not script_dir:
        script_dir = os.path.join(os.path.dirname(__file__), '..', 'Scripts')
    return os.path.join(*(script_dir,) + args)


def top_level_path(*args):
    return os.path.join(*((script_path('..', '..'),) + args))


def get_build_path():
    global build_dir
    if build_dir:
        return build_dir

    def is_valid_build_directory(path):
        return os.path.exists(os.path.join(path, 'GNUmakefile')) or \
            os.path.exists(os.path.join(path, 'Programs', 'DumpRenderTree'))

    if len(sys.argv[1:]) > 1 and os.path.exists(sys.argv[-1]) and is_valid_build_directory(sys.argv[-1]):
        return sys.argv[-1]

    # Debian and Ubuntu build both flavours of the library (with gtk2
    # and with gtk3); they use directories build-2.0 and build-3.0 for
    # that, which is not handled by the above cases; we check that the
    # directory where we are called from is a valid build directory,
    # which should handle pretty much all other non-standard cases.
    build_dir = os.getcwd()
    if is_valid_build_directory(build_dir):
        return build_dir

    for build_type in ('Release', 'Debug'):
        build_dir = top_level_path('WebKitBuild', build_type)
        if is_valid_build_directory(build_dir):
            return build_dir

    # distcheck builds in a directory named _build in the top-level path.
    build_dir = top_level_path("_build")
    if is_valid_build_directory(build_dir):
        return build_dir

    build_dir = top_level_path()
    if is_valid_build_directory(build_dir):
        return build_dir

    build_dir = top_level_path("WebKitBuild")
    if is_valid_build_directory(build_dir):
        return build_dir

    print 'Could not determine build directory.'
    sys.exit(1)


def build_path(*args):
    return os.path.join(*(get_build_path(),) + args)


def pkg_config_file_variable(package, variable):
    process = subprocess.Popen(['pkg-config', '--variable=%s' % variable, package],
                               stdout=subprocess.PIPE)
    stdout = process.communicate()[0]
    if process.returncode:
        return None
    return stdout.strip()


def prefix_of_pkg_config_file(package):
    return pkg_config_file_variable(package, 'prefix')


def gtk_version_of_pkg_config_file(pkg_config_path):
    process = subprocess.Popen(['pkg-config', pkg_config_path, '--print-requires'],
                               stdout=subprocess.PIPE)
    stdout = process.communicate()[0]

    if 'gtk+-3.0' in stdout:
        return 3
    return 2