from __future__ import print_function

from os.path import (join, realpath, dirname, expanduser, exists,
                     split, isdir)
from os import environ
import copy
import os
import glob
import sys
import re
import sh
import subprocess

from pythonforandroid.util import (
    current_directory, ensure_dir, get_virtualenv_executable,
    BuildInterruptingException
)
from pythonforandroid.logger import (info, warning, info_notify, info_main, shprint)
from pythonforandroid.archs import ArchARM, ArchARMv7_a, ArchAarch_64, Archx86, Archx86_64
from pythonforandroid.recipe import CythonRecipe, Recipe
from pythonforandroid.recommendations import (
    check_ndk_version, check_target_api, check_ndk_api,
    RECOMMENDED_NDK_API, RECOMMENDED_TARGET_API)


class Context(object):
    '''A build context. If anything will be built, an instance this class
    will be instantiated and used to hold all the build state.'''

    env = environ.copy()
    # the filepath of toolchain.py
    root_dir = None
    # the root dir where builds and dists will be stored
    storage_dir = None

    # in which bootstraps are copied for building
    # and recipes are built
    build_dir = None
    # the Android project folder where everything ends up
    dist_dir = None
    # where Android libs are cached after build
    # but before being placed in dists
    libs_dir = None
    aars_dir = None

    ccache = None  # whether to use ccache
    cython = None  # the cython interpreter name

    ndk_platform = None  # the ndk platform directory

    dist_name = None  # should be deprecated in favour of self.dist.dist_name
    bootstrap = None
    bootstrap_build_dir = None

    recipe_build_order = None  # Will hold the list of all built recipes

    symlink_java_src = False  # If True, will symlink instead of copying during build

    java_build_tool = 'auto'

    @property
    def packages_path(self):
        '''Where packages are downloaded before being unpacked'''
        return join(self.storage_dir, 'packages')

    @property
    def templates_dir(self):
        return join(self.root_dir, 'templates')

    @property
    def libs_dir(self):
        # Was previously hardcoded as self.build_dir/libs
        dir = join(self.build_dir, 'libs_collections',
                   self.bootstrap.distribution.name)
        ensure_dir(dir)
        return dir

    @property
    def javaclass_dir(self):
        # Was previously hardcoded as self.build_dir/java
        dir = join(self.build_dir, 'javaclasses',
                   self.bootstrap.distribution.name)
        ensure_dir(dir)
        return dir

    @property
    def aars_dir(self):
        dir = join(self.build_dir, 'aars', self.bootstrap.distribution.name)
        ensure_dir(dir)
        return dir

    @property
    def python_installs_dir(self):
        dir = join(self.build_dir, 'python-installs')
        ensure_dir(dir)
        return dir

    def get_python_install_dir(self):
        dir = join(self.python_installs_dir, self.bootstrap.distribution.name)
        return dir

    def setup_dirs(self, storage_dir):
        '''Calculates all the storage and build dirs, and makes sure
        the directories exist where necessary.'''
        self.storage_dir = expanduser(storage_dir)
        if ' ' in self.storage_dir:
            raise ValueError('storage dir path cannot contain spaces, please '
                             'specify a path with --storage-dir')
        self.build_dir = join(self.storage_dir, 'build')
        self.dist_dir = join(self.storage_dir, 'dists')

    def ensure_dirs(self):
        ensure_dir(self.storage_dir)
        ensure_dir(self.build_dir)
        ensure_dir(self.dist_dir)
        ensure_dir(join(self.build_dir, 'bootstrap_builds'))
        ensure_dir(join(self.build_dir, 'other_builds'))

    @property
    def android_api(self):
        '''The Android API being targeted.'''
        if self._android_api is None:
            raise ValueError('Tried to access android_api but it has not '
                             'been set - this should not happen, something '
                             'went wrong!')
        return self._android_api

    @android_api.setter
    def android_api(self, value):
        self._android_api = value

    @property
    def ndk_api(self):
        '''The API number compile against'''
        if self._ndk_api is None:
            raise ValueError('Tried to access ndk_api but it has not '
                             'been set - this should not happen, something '
                             'went wrong!')
        return self._ndk_api

    @ndk_api.setter
    def ndk_api(self, value):
        self._ndk_api = value

    @property
    def sdk_dir(self):
        '''The path to the Android SDK.'''
        if self._sdk_dir is None:
            raise ValueError('Tried to access sdk_dir but it has not '
                             'been set - this should not happen, something '
                             'went wrong!')
        return self._sdk_dir

    @sdk_dir.setter
    def sdk_dir(self, value):
        self._sdk_dir = value

    @property
    def ndk_dir(self):
        '''The path to the Android NDK.'''
        if self._ndk_dir is None:
            raise ValueError('Tried to access ndk_dir but it has not '
                             'been set - this should not happen, something '
                             'went wrong!')
        return self._ndk_dir

    @ndk_dir.setter
    def ndk_dir(self, value):
        self._ndk_dir = value

    def prepare_build_environment(self,
                                  user_sdk_dir,
                                  user_ndk_dir,
                                  user_android_api,
                                  user_ndk_api):
        '''Checks that build dependencies exist and sets internal variables
        for the Android SDK etc.

        ..warning:: This *must* be called before trying any build stuff

        '''

        self.ensure_dirs()

        if self._build_env_prepared:
            return

        ok = True

        # Work out where the Android SDK is
        sdk_dir = None
        if user_sdk_dir:
            sdk_dir = user_sdk_dir
        # This is the old P4A-specific var
        if sdk_dir is None:
            sdk_dir = environ.get('ANDROIDSDK', None)
        # This seems used more conventionally
        if sdk_dir is None:
            sdk_dir = environ.get('ANDROID_HOME', None)
        # Checks in the buildozer SDK dir, useful for debug tests of p4a
        if sdk_dir is None:
            possible_dirs = glob.glob(expanduser(join(
                '~', '.buildozer', 'android', 'platform', 'android-sdk-*')))
            possible_dirs = [d for d in possible_dirs if not
                             (d.endswith('.bz2') or d.endswith('.gz'))]
            if possible_dirs:
                info('Found possible SDK dirs in buildozer dir: {}'.format(
                    ', '.join([d.split(os.sep)[-1] for d in possible_dirs])))
                info('Will attempt to use SDK at {}'.format(possible_dirs[0]))
                warning('This SDK lookup is intended for debug only, if you '
                        'use python-for-android much you should probably '
                        'maintain your own SDK download.')
                sdk_dir = possible_dirs[0]
        if sdk_dir is None:
            raise BuildInterruptingException('Android SDK dir was not specified, exiting.')
        self.sdk_dir = realpath(sdk_dir)

        # Check what Android API we're using
        android_api = None
        if user_android_api:
            android_api = user_android_api
            info('Getting Android API version from user argument: {}'.format(android_api))
        elif 'ANDROIDAPI' in environ:
            android_api = environ['ANDROIDAPI']
            info('Found Android API target in $ANDROIDAPI: {}'.format(android_api))
        else:
            info('Android API target was not set manually, using '
                 'the default of {}'.format(RECOMMENDED_TARGET_API))
            android_api = RECOMMENDED_TARGET_API
        android_api = int(android_api)
        self.android_api = android_api

        check_target_api(android_api, self.archs[0].arch)

        if exists(join(sdk_dir, 'tools', 'bin', 'avdmanager')):
            avdmanager = sh.Command(join(sdk_dir, 'tools', 'bin', 'avdmanager'))
            targets = avdmanager('list', 'target').stdout.decode('utf-8').split('\n')
        elif exists(join(sdk_dir, 'tools', 'android')):
            android = sh.Command(join(sdk_dir, 'tools', 'android'))
            targets = android('list').stdout.decode('utf-8').split('\n')
        else:
            raise BuildInterruptingException(
                'Could not find `android` or `sdkmanager` binaries in Android SDK',
                instructions='Make sure the path to the Android SDK is correct')
        apis = [s for s in targets if re.match(r'^ *API level: ', s)]
        apis = [re.findall(r'[0-9]+', s) for s in apis]
        apis = [int(s[0]) for s in apis if s]
        info('Available Android APIs are ({})'.format(
            ', '.join(map(str, apis))))
        if android_api in apis:
            info(('Requested API target {} is available, '
                  'continuing.').format(android_api))
        else:
            raise BuildInterruptingException(
                ('Requested API target {} is not available, install '
                 'it with the SDK android tool.').format(android_api))

        # Find the Android NDK
        # Could also use ANDROID_NDK, but doesn't look like many tools use this
        ndk_dir = None
        if user_ndk_dir:
            ndk_dir = user_ndk_dir
            info('Getting NDK dir from from user argument')
        if ndk_dir is None:  # The old P4A-specific dir
            ndk_dir = environ.get('ANDROIDNDK', None)
            if ndk_dir is not None:
                info('Found NDK dir in $ANDROIDNDK: {}'.format(ndk_dir))
        if ndk_dir is None:  # Apparently the most common convention
            ndk_dir = environ.get('NDK_HOME', None)
            if ndk_dir is not None:
                info('Found NDK dir in $NDK_HOME: {}'.format(ndk_dir))
        if ndk_dir is None:  # Another convention (with maven?)
            ndk_dir = environ.get('ANDROID_NDK_HOME', None)
            if ndk_dir is not None:
                info('Found NDK dir in $ANDROID_NDK_HOME: {}'.format(ndk_dir))
        if ndk_dir is None:  # Checks in the buildozer NDK dir, useful
            #                # for debug tests of p4a
            possible_dirs = glob.glob(expanduser(join(
                '~', '.buildozer', 'android', 'platform', 'android-ndk-r*')))
            if possible_dirs:
                info('Found possible NDK dirs in buildozer dir: {}'.format(
                    ', '.join([d.split(os.sep)[-1] for d in possible_dirs])))
                info('Will attempt to use NDK at {}'.format(possible_dirs[0]))
                warning('This NDK lookup is intended for debug only, if you '
                        'use python-for-android much you should probably '
                        'maintain your own NDK download.')
                ndk_dir = possible_dirs[0]
        if ndk_dir is None:
            raise BuildInterruptingException('Android NDK dir was not specified')
        self.ndk_dir = realpath(ndk_dir)

        check_ndk_version(ndk_dir)

        self.ndk = 'crystax' # force crystax detection

        ndk_api = None
        if user_ndk_api:
            ndk_api = user_ndk_api
            info('Getting NDK API version (i.e. minimum supported API) from user argument')
        elif 'NDKAPI' in environ:
            ndk_api = environ.get('NDKAPI', None)
            info('Found Android API target in $NDKAPI')
        else:
            ndk_api = min(self.android_api, RECOMMENDED_NDK_API)
            warning('NDK API target was not set manually, using '
                    'the default of {} = min(android-api={}, default ndk-api={})'.format(
                        ndk_api, self.android_api, RECOMMENDED_NDK_API))
        ndk_api = int(ndk_api)
        self.ndk_api = ndk_api

        check_ndk_api(ndk_api, self.android_api)

        virtualenv = get_virtualenv_executable()
        if virtualenv is None:
            raise IOError('Couldn\'t find a virtualenv executable, '
                          'you must install this to use p4a.')
        self.virtualenv = virtualenv
        info('Found virtualenv at {}'.format(virtualenv))

        # path to some tools
        self.ccache = sh.which("ccache")
        if not self.ccache:
            info('ccache is missing, the build will not be optimized in the '
                 'future.')
        for cython_fn in ("cython", "cython3", "cython2", "cython-2.7"):
            cython = sh.which(cython_fn)
            if cython:
                self.cython = cython
                break
        else:
            raise BuildInterruptingException('No cython binary found.')
        if not self.cython:
            ok = False
            warning("Missing requirement: cython is not installed")

        # This would need to be changed if supporting multiarch APKs
        arch = self.archs[0]
        platform_dir = arch.platform_dir
        toolchain_prefix = arch.toolchain_prefix
        toolchain_version = None
        self.ndk_platform = join(
            self.ndk_dir,
            'platforms',
            'android-{}'.format(self.ndk_api),
            platform_dir)
        if not exists(self.ndk_platform):
            warning('ndk_platform doesn\'t exist: {}'.format(
                self.ndk_platform))
            ok = False

        py_platform = sys.platform
        if py_platform in ['linux2', 'linux3']:
            py_platform = 'linux'

        toolchain_versions = []
        toolchain_path = join(self.ndk_dir, 'toolchains')
        if isdir(toolchain_path):
            toolchain_contents = glob.glob('{}/{}-*'.format(toolchain_path,
                                                            toolchain_prefix))
            toolchain_versions = [split(path)[-1][len(toolchain_prefix) + 1:]
                                  for path in toolchain_contents]
        else:
            warning('Could not find toolchain subdirectory!')
            ok = False
        toolchain_versions.sort()

        toolchain_versions_gcc = []
        for toolchain_version in toolchain_versions:
            if toolchain_version[0].isdigit():
                # GCC toolchains begin with a number
                toolchain_versions_gcc.append(toolchain_version)

        if toolchain_versions:
            info('Found the following toolchain versions: {}'.format(
                toolchain_versions))
            info('Picking the latest gcc toolchain, here {}'.format(
                toolchain_versions_gcc[-1]))
            toolchain_version = toolchain_versions_gcc[-1]
        else:
            warning('Could not find any toolchain for {}!'.format(
                toolchain_prefix))
            ok = False

        self.toolchain_prefix = toolchain_prefix
        self.toolchain_version = toolchain_version
        # Modify the path so that sh finds modules appropriately
        environ['PATH'] = (
            '{ndk_dir}/toolchains/{toolchain_prefix}-{toolchain_version}/'
            'prebuilt/{py_platform}-x86/bin/:{ndk_dir}/toolchains/'
            '{toolchain_prefix}-{toolchain_version}/prebuilt/'
            '{py_platform}-x86_64/bin/:{ndk_dir}:{sdk_dir}/'
            'tools:{path}').format(
                sdk_dir=self.sdk_dir, ndk_dir=self.ndk_dir,
                toolchain_prefix=toolchain_prefix,
                toolchain_version=toolchain_version,
                py_platform=py_platform, path=environ.get('PATH'))

        for executable in ("pkg-config", "autoconf", "automake", "libtoolize",
                           "tar", "bzip2", "unzip", "make", "gcc", "g++"):
            if not sh.which(executable):
                warning("Missing executable: {} is not installed".format(
                    executable))

        if not ok:
            raise BuildInterruptingException(
                'python-for-android cannot continue due to the missing executables above')

    def __init__(self):
        super(Context, self).__init__()
        self.include_dirs = []

        self._build_env_prepared = False

        self._sdk_dir = None
        self._ndk_dir = None
        self._android_api = None
        self._ndk_api = None
        self.ndk = None

        self.toolchain_prefix = None
        self.toolchain_version = None

        self.local_recipes = None
        self.copy_libs = False

        # this list should contain all Archs, it is pruned later
        self.archs = (
            ArchARM(self),
            ArchARMv7_a(self),
            Archx86(self),
            Archx86_64(self),
            ArchAarch_64(self),
            )

        self.root_dir = realpath(dirname(__file__))

        # remove the most obvious flags that can break the compilation
        self.env.pop("LDFLAGS", None)
        self.env.pop("ARCHFLAGS", None)
        self.env.pop("CFLAGS", None)

        self.python_recipe = None  # Set by TargetPythonRecipe

    def set_archs(self, arch_names):
        all_archs = self.archs
        new_archs = set()
        for name in arch_names:
            matching = [arch for arch in all_archs if arch.arch == name]
            for match in matching:
                new_archs.add(match)
        self.archs = list(new_archs)
        if not self.archs:
            raise BuildInterruptingException('Asked to compile for no Archs, so failing.')
        info('Will compile for the following archs: {}'.format(
            ', '.join([arch.arch for arch in self.archs])))

    def prepare_bootstrap(self, bs):
        bs.ctx = self
        self.bootstrap = bs
        self.bootstrap.prepare_build_dir()
        self.bootstrap_build_dir = self.bootstrap.build_dir

    def prepare_dist(self, name):
        self.dist_name = name
        self.bootstrap.prepare_dist_dir(self.dist_name)

    def get_site_packages_dir(self, arch=None):
        '''Returns the location of site-packages in the python-install build
        dir.
        '''
        if self.python_recipe.name == 'python2legacy':
            return join(self.get_python_install_dir(),
                        'lib', 'python2.7', 'site-packages')
        return self.get_python_install_dir()

    def get_libs_dir(self, arch):
        '''The libs dir for a given arch.'''
        ensure_dir(join(self.libs_dir, arch))
        return join(self.libs_dir, arch)

    def has_lib(self, arch, lib):
        return exists(join(self.get_libs_dir(arch), lib))

    def has_package(self, name, arch=None):
        # If this is a file path, it'll need special handling:
        if (name.find("/") >= 0 or name.find("\\") >= 0) and \
                name.find("://") < 0:  # (:// would indicate an url)
            if not os.path.exists(name):
                # Non-existing dir, cannot look this up.
                return False
            if os.path.exists(os.path.join(name, "setup.py")):
                # Get name from setup.py:
                name = subprocess.check_output([
                    sys.executable, "setup.py", "--name"],
                    cwd=name)
                try:
                    name = name.decode('utf-8', 'replace')
                except AttributeError:
                    pass
                name = name.strip()
                if len(name) == 0:
                    # Failed to look up any meaningful name.
                    return False
            else:
                # A folder with whatever, cannot look this up.
                return False

        # Try to look up recipe by name:
        try:
            recipe = Recipe.get_recipe(name, self)
        except ValueError:
            pass
        else:
            name = getattr(recipe, 'site_packages_name', None) or name
        name = name.replace('.', '/')
        site_packages_dir = self.get_site_packages_dir(arch)
        return (exists(join(site_packages_dir, name)) or
                exists(join(site_packages_dir, name + '.py')) or
                exists(join(site_packages_dir, name + '.pyc')) or
                exists(join(site_packages_dir, name + '.pyo')) or
                exists(join(site_packages_dir, name + '.so')) or
                glob.glob(join(site_packages_dir, name + '-*.egg')))

    def not_has_package(self, name, arch=None):
        return not self.has_package(name, arch)


def build_recipes(build_order, python_modules, ctx):
    # Put recipes in correct build order
    info_notify("Recipe build order is {}".format(build_order))
    if python_modules:
        python_modules = sorted(set(python_modules))
        info_notify(
            ('The requirements ({}) were not found as recipes, they will be '
             'installed with pip.').format(', '.join(python_modules)))

    recipes = [Recipe.get_recipe(name, ctx) for name in build_order]

    # download is arch independent
    info_main('# Downloading recipes ')
    for recipe in recipes:
        recipe.download_if_necessary()

    for arch in ctx.archs:
        info_main('# Building all recipes for arch {}'.format(arch.arch))

        info_main('# Unpacking recipes')
        for recipe in recipes:
            ensure_dir(recipe.get_build_container_dir(arch.arch))
            recipe.prepare_build_dir(arch.arch)

        info_main('# Prebuilding recipes')
        # 2) prebuild packages
        for recipe in recipes:
            info_main('Prebuilding {} for {}'.format(recipe.name, arch.arch))
            recipe.prebuild_arch(arch)
            recipe.apply_patches(arch)

        # 3) build packages
        info_main('# Building recipes')
        for recipe in recipes:
            info_main('Building {} for {}'.format(recipe.name, arch.arch))
            if recipe.should_build(arch):
                recipe.build_arch(arch)
            else:
                info('{} said it is already built, skipping'
                     .format(recipe.name))

        # 4) biglink everything
        info_main('# Biglinking object files')
        if not ctx.python_recipe or not ctx.python_recipe.from_crystax:
            biglink(ctx, arch)
        else:
            info('NDK is crystax, skipping biglink (will this work?)')

        # 5) postbuild packages
        info_main('# Postbuilding recipes')
        for recipe in recipes:
            info_main('Postbuilding {} for {}'.format(recipe.name, arch.arch))
            recipe.postbuild_arch(arch)

    info_main('# Installing pure Python modules')
    run_pymodules_install(ctx, python_modules)

    return


def run_pymodules_install(ctx, modules):
    modules = list(filter(ctx.not_has_package, modules))

    if not modules:
        info('There are no Python modules to install, skipping')
        return

    info('The requirements ({}) don\'t have recipes, attempting to install '
         'them with pip'.format(', '.join(modules)))
    info('If this fails, it may mean that the module has compiled '
         'components and needs a recipe.')

    venv = sh.Command(ctx.virtualenv)
    with current_directory(join(ctx.build_dir)):
        shprint(venv,
                '--python=python{}.{}'.format(
                    ctx.python_recipe.major_minor_version_string.partition(".")[0],
                    ctx.python_recipe.major_minor_version_string.partition(".")[2]
                    ),
                'venv'
               )

        info('Creating a requirements.txt file for the Python modules')
        with open('requirements.txt', 'w') as fileh:
            for module in modules:
                key = 'VERSION_' + module
                if key in environ:
                    line = '{}=={}\n'.format(module, environ[key])
                else:
                    line = '{}\n'.format(module)
                fileh.write(line)

        # Prepare base environment and upgrade pip:
        base_env = copy.copy(os.environ)
        base_env["PYTHONPATH"] = ctx.get_site_packages_dir()
        info('Upgrade pip to latest version')
        shprint(sh.bash, '-c', (
            "source venv/bin/activate && pip install -U pip"
        ), _env=copy.copy(base_env))

        # Install Cython in case modules need it to build:
        info('Install Cython in case one of the modules needs it to build')
        shprint(sh.bash, '-c', (
            "venv/bin/pip install Cython"
        ), _env=copy.copy(base_env))

        # Get environment variables for build (with CC/compiler set):
        standard_recipe = CythonRecipe()
        standard_recipe.ctx = ctx
        # (note: following line enables explicit -lpython... linker options)
        standard_recipe.call_hostpython_via_targetpython = False
        recipe_env = standard_recipe.get_recipe_env(ctx.archs[0])
        env = copy.copy(base_env)
        env.update(recipe_env)

        info('Installing Python modules with pip')
        info('IF THIS FAILS, THE MODULES MAY NEED A RECIPE. '
             'A reason for this is often modules compiling '
             'native code that is unaware of Android cross-compilation '
             'and does not work without additional '
             'changes / workarounds.')

        # Make sure our build package dir is available, and the virtualenv
        # site packages come FIRST (so the proper pip version is used):
        env["PYTHONPATH"] += ":" + ctx.get_site_packages_dir()
        env["PYTHONPATH"] = os.path.abspath(join(
            ctx.build_dir, "venv", "lib",
            "python" + ctx.python_recipe.major_minor_version_string,
            "site-packages")) + ":" + env["PYTHONPATH"]

        '''
        # Do actual install:
        shprint(sh.bash, '-c', (
            "venv/bin/pip " +
            "install -v --target '{0}' --no-deps -r requirements.txt"
        ).format(ctx.get_site_packages_dir().replace("'", "'\"'\"'")),
                _env=copy.copy(env))
        '''

        # use old install script
        shprint(sh.bash, '-c', (
            "source venv/bin/activate && env CC=/bin/false CXX=/bin/false "
            "PYTHONPATH={0} pip install --target '{0}' --no-deps -r requirements.txt"
        ).format(ctx.get_site_packages_dir()))

        # Strip object files after potential Cython or native code builds:
        standard_recipe.strip_object_files(ctx.archs[0], env,
                                           build_dir=ctx.build_dir)


def biglink(ctx, arch):
    # First, collate object files from each recipe
    info('Collating object files from each recipe')
    obj_dir = join(ctx.bootstrap.build_dir, 'collated_objects')
    ensure_dir(obj_dir)
    recipes = [Recipe.get_recipe(name, ctx) for name in ctx.recipe_build_order]
    for recipe in recipes:
        recipe_obj_dir = join(recipe.get_build_container_dir(arch.arch),
                              'objects_{}'.format(recipe.name))
        if not exists(recipe_obj_dir):
            info('{} recipe has no biglinkable files dir, skipping'
                 .format(recipe.name))
            continue
        files = glob.glob(join(recipe_obj_dir, '*'))
        if not len(files):
            info('{} recipe has no biglinkable files, skipping'
                 .format(recipe.name))
            continue
        info('{} recipe has object files, copying'.format(recipe.name))
        files.append(obj_dir)
        shprint(sh.cp, '-r', *files)

    env = arch.get_env()
    env['LDFLAGS'] = env['LDFLAGS'] + ' -L{}'.format(
        join(ctx.bootstrap.build_dir, 'obj', 'local', arch.arch))

    if not len(glob.glob(join(obj_dir, '*'))):
        info('There seem to be no libraries to biglink, skipping.')
        return
    info('Biglinking')
    info('target {}'.format(join(ctx.get_libs_dir(arch.arch),
                                 'libpymodules.so')))
    do_biglink = copylibs_function if ctx.copy_libs else biglink_function

    # Move to the directory containing crtstart_so.o and crtend_so.o
    # This is necessary with newer NDKs? A gcc bug?
    with current_directory(join(ctx.ndk_platform, 'usr', 'lib')):
        do_biglink(
            join(ctx.get_libs_dir(arch.arch), 'libpymodules.so'),
            obj_dir.split(' '),
            extra_link_dirs=[join(ctx.bootstrap.build_dir,
                                  'obj', 'local', arch.arch),
                             os.path.abspath('.')],
            env=env)


def biglink_function(soname, objs_paths, extra_link_dirs=[], env=None):
    print('objs_paths are', objs_paths)
    sofiles = []

    for directory in objs_paths:
        for fn in os.listdir(directory):
            fn = os.path.join(directory, fn)

            if not fn.endswith(".so.o"):
                continue
            if not os.path.exists(fn[:-2] + ".libs"):
                continue

            sofiles.append(fn[:-2])

    # The raw argument list.
    args = []

    for fn in sofiles:
        afn = fn + ".o"
        libsfn = fn + ".libs"

        args.append(afn)
        with open(libsfn) as fd:
            data = fd.read()
            args.extend(data.split(" "))

    unique_args = []
    while args:
        a = args.pop()
        if a in ('-L', ):
            continue
        if a not in unique_args:
            unique_args.insert(0, a)

    for dir in extra_link_dirs:
        link = '-L{}'.format(dir)
        if link not in unique_args:
            unique_args.append(link)

    cc_name = env['CC']
    cc = sh.Command(cc_name.split()[0])
    cc = cc.bake(*cc_name.split()[1:])

    shprint(cc, '-shared', '-O3', '-o', soname, *unique_args, _env=env)


def copylibs_function(soname, objs_paths, extra_link_dirs=[], env=None):
    print('objs_paths are', objs_paths)

    re_needso = re.compile(r'^.*\(NEEDED\)\s+Shared library: \[lib(.*)\.so\]\s*$')
    blacklist_libs = (
        'c',
        'stdc++',
        'dl',
        'python2.7',
        'sdl',
        'sdl_image',
        'sdl_ttf',
        'z',
        'm',
        'GLESv2',
        'jpeg',
        'png',
        'log',

        # bootstrap takes care of sdl2 libs (if applicable)
        'SDL2',
        'SDL2_ttf',
        'SDL2_image',
        'SDL2_mixer',
    )
    found_libs = []
    sofiles = []
    if env and 'READELF' in env:
        readelf = env['READELF']
    elif 'READELF' in os.environ:
        readelf = os.environ['READELF']
    else:
        readelf = sh.which('readelf').strip()
    readelf = sh.Command(readelf).bake('-d')

    dest = dirname(soname)

    for directory in objs_paths:
        for fn in os.listdir(directory):
            fn = join(directory, fn)

            if not fn.endswith('.libs'):
                continue

            dirfn = fn[:-1] + 'dirs'
            if not exists(dirfn):
                continue

            with open(fn) as f:
                libs = f.read().strip().split(' ')
                needed_libs = [lib for lib in libs
                               if lib and
                               lib not in blacklist_libs and
                               lib not in found_libs]

            while needed_libs:
                print('need libs:\n\t' + '\n\t'.join(needed_libs))

                start_needed_libs = needed_libs[:]
                found_sofiles = []

                with open(dirfn) as f:
                    libdirs = f.read().split()
                    for libdir in libdirs:
                        if not needed_libs:
                            break

                        if libdir == dest:
                            # don't need to copy from dest to dest!
                            continue

                        libdir = libdir.strip()
                        print('scanning', libdir)
                        for lib in needed_libs[:]:
                            if lib in found_libs:
                                continue

                            if lib.endswith('.a'):
                                needed_libs.remove(lib)
                                found_libs.append(lib)
                                continue

                            lib_a = 'lib' + lib + '.a'
                            libpath_a = join(libdir, lib_a)
                            lib_so = 'lib' + lib + '.so'
                            libpath_so = join(libdir, lib_so)
                            plain_so = lib + '.so'
                            plainpath_so = join(libdir, plain_so)

                            sopath = None
                            if exists(libpath_so):
                                sopath = libpath_so
                            elif exists(plainpath_so):
                                sopath = plainpath_so

                            if sopath:
                                print('found', lib, 'in', libdir)
                                found_sofiles.append(sopath)
                                needed_libs.remove(lib)
                                found_libs.append(lib)
                                continue

                            if exists(libpath_a):
                                print('found', lib, '(static) in', libdir)
                                needed_libs.remove(lib)
                                found_libs.append(lib)
                                continue

                for sofile in found_sofiles:
                    print('scanning dependencies for', sofile)
                    out = readelf(sofile)
                    for line in out.splitlines():
                        needso = re_needso.match(line)
                        if needso:
                            lib = needso.group(1)
                            if (lib not in needed_libs
                                    and lib not in found_libs
                                    and lib not in blacklist_libs):
                                needed_libs.append(needso.group(1))

                sofiles += found_sofiles

                if needed_libs == start_needed_libs:
                    raise RuntimeError(
                            'Failed to locate needed libraries!\n\t' +
                            '\n\t'.join(needed_libs))

    print('Copying libraries')
    for lib in sofiles:
        shprint(sh.cp, lib, dest)
