import os
import platform
import sys
from os.path import join

from numpy.distutils.system_info import platform_bits

is_msvc = (platform.platform().startswith('Windows') and
           platform.python_compiler().startswith('MS'))


def configuration(parent_package='', top_path=None):
    from numpy.distutils.misc_util import Configuration, get_mathlibs
    config = Configuration('random', parent_package, top_path)

    def generate_libraries(ext, build_dir):
        config_cmd = config.get_config_cmd()
        libs = get_mathlibs()
        if sys.platform == 'win32':
            libs.extend(['Advapi32', 'Kernel32'])
        ext.libraries.extend(libs)
        return None

    # enable unix large file support on 32 bit systems
    # (64 bit off_t, lseek -> lseek64 etc.)
    if sys.platform[:3] == 'aix':
        defs = [('_LARGE_FILES', None)]
    else:
        defs = [('_FILE_OFFSET_BITS', '64'),
                ('_LARGEFILE_SOURCE', '1'),
                ('_LARGEFILE64_SOURCE', '1')]

    defs.append(('NPY_NO_DEPRECATED_API', 0))
    config.add_subpackage('tests')
    config.add_data_dir('tests/data')
    config.add_data_dir('_examples')

    EXTRA_LINK_ARGS = []
    EXTRA_LIBRARIES = ['npyrandom']
    if os.name != 'nt':
        # Math lib
        EXTRA_LIBRARIES.append('m')
    # Some bit generators exclude GCC inlining
    EXTRA_COMPILE_ARGS = ['-U__GNUC_GNU_INLINE__']

    if is_msvc and platform_bits == 32:
        # 32-bit windows requires explicit sse2 option
        EXTRA_COMPILE_ARGS += ['/arch:SSE2']
    elif not is_msvc:
        # Some bit generators require c99
        EXTRA_COMPILE_ARGS += ['-std=c99']

    if sys.platform == 'cygwin':
        # Export symbols without __declspec(dllexport) for using by cython.
        # Using __declspec(dllexport) does not export other necessary symbols
        # in Cygwin package's Cython environment, making it impossible to
        # import modules.
        EXTRA_LINK_ARGS += ['-Wl,--export-all-symbols']

    # Use legacy integer variable sizes
    LEGACY_DEFS = [('NP_RANDOM_LEGACY', '1')]
    PCG64_DEFS = []
    # One can force emulated 128-bit arithmetic if one wants.
    #PCG64_DEFS += [('PCG_FORCE_EMULATED_128BIT_MATH', '1')]
    depends = ['__init__.pxd', 'c_distributions.pxd', 'bit_generator.pxd']

    # npyrandom - a library like npymath
    npyrandom_sources = [
        'src/distributions/logfactorial.c',
        'src/distributions/distributions.c',
        'src/distributions/random_mvhg_count.c',
        'src/distributions/random_mvhg_marginals.c',
        'src/distributions/random_hypergeometric.c',
    ]

    def gl_if_msvc(build_cmd):
        """ Add flag if we are using MSVC compiler

        We can't see this in our scope, because we have not initialized the
        distutils build command, so use this deferred calculation to run when
        we are building the library.
        """
        # Keep in sync with numpy/core/setup.py
        if build_cmd.compiler.compiler_type == 'msvc':
            # explicitly disable whole-program optimization
            return ['/GL-']
        return []

    config.add_installed_library('npyrandom',
        sources=npyrandom_sources,
        install_dir='lib',
        build_info={
            'include_dirs' : [],  # empty list required for creating npyrandom.h
            'extra_compiler_args': [gl_if_msvc],
        })

    for gen in ['mt19937']:
        # gen.pyx, src/gen/gen.c, src/gen/gen-jump.c
        config.add_extension(f'_{gen}',
                             sources=[f'_{gen}.c',
                                      f'src/{gen}/{gen}.c',
                                      f'src/{gen}/{gen}-jump.c'],
                             include_dirs=['.', 'src', join('src', gen)],
                             libraries=EXTRA_LIBRARIES,
                             extra_compile_args=EXTRA_COMPILE_ARGS,
                             extra_link_args=EXTRA_LINK_ARGS,
                             depends=depends + [f'_{gen}.pyx'],
                             define_macros=defs,
                             )
    for gen in ['philox', 'pcg64', 'sfc64']:
        # gen.pyx, src/gen/gen.c
        _defs = defs + PCG64_DEFS if gen == 'pcg64' else defs
        config.add_extension(f'_{gen}',
                             sources=[f'_{gen}.c',
                                      f'src/{gen}/{gen}.c'],
                             include_dirs=['.', 'src', join('src', gen)],
                             libraries=EXTRA_LIBRARIES,
                             extra_compile_args=EXTRA_COMPILE_ARGS,
                             extra_link_args=EXTRA_LINK_ARGS,
                             depends=depends + [f'_{gen}.pyx',
                                   'bit_generator.pyx', 'bit_generator.pxd'],
                             define_macros=_defs,
                             )
    for gen in ['_common', 'bit_generator']:
        # gen.pyx
        config.add_extension(gen,
                             sources=[f'{gen}.c'],
                             libraries=EXTRA_LIBRARIES,
                             extra_compile_args=EXTRA_COMPILE_ARGS,
                             extra_link_args=EXTRA_LINK_ARGS,
                             include_dirs=['.', 'src'],
                             depends=depends + [f'{gen}.pyx', f'{gen}.pxd',],
                             define_macros=defs,
                             )
        config.add_data_files(f'{gen}.pxd')
    for gen in ['_generator', '_bounded_integers']:
        # gen.pyx, src/distributions/distributions.c
        config.add_extension(gen,
                             sources=[f'{gen}.c'],
                             libraries=EXTRA_LIBRARIES + ['npymath'],
                             extra_compile_args=EXTRA_COMPILE_ARGS,
                             include_dirs=['.', 'src'],
                             extra_link_args=EXTRA_LINK_ARGS,
                             depends=depends + [f'{gen}.pyx'],
                             define_macros=defs,
                             )
    config.add_data_files('_bounded_integers.pxd')
    mtrand_libs = ['m', 'npymath'] if os.name != 'nt' else ['npymath']
    config.add_extension('mtrand',
                         sources=['mtrand.c',
                                  'src/legacy/legacy-distributions.c',
                                  'src/distributions/distributions.c',
                                 ],
                         include_dirs=['.', 'src', 'src/legacy'],
                         libraries=mtrand_libs,
                         extra_compile_args=EXTRA_COMPILE_ARGS,
                         extra_link_args=EXTRA_LINK_ARGS,
                         depends=depends + ['mtrand.pyx'],
                         define_macros=defs + LEGACY_DEFS,
                         )
    config.add_data_files(*depends)
    config.add_data_files('*.pyi')
    return config


if __name__ == '__main__':
    from numpy.distutils.core import setup

    setup(configuration=configuration)
