import os
import sys
import subprocess
from methods import detect_darwin_sdk_path


def is_active():
    return True


def get_name():
    return "OSX"


def can_build():

    if (sys.platform == "darwin" or ("OSXCROSS_ROOT" in os.environ)):
        return True

    return False


def get_opts():
    from SCons.Variables import BoolVariable, EnumVariable

    return [
        ('osxcross_sdk', 'OSXCross SDK version', 'darwin14'),
        ('MACOS_SDK_PATH', 'Path to the macOS SDK', ''),
        BoolVariable('use_static_mvk', 'Link MoltenVK statically as Level-0 driver (better portability) or use Vulkan ICD loader (enables validation layers)', False),
        EnumVariable('debug_symbols', 'Add debugging symbols to release builds', 'yes', ('yes', 'no', 'full')),
        BoolVariable('separate_debug_symbols', 'Create a separate file containing debugging symbols', False),
        BoolVariable('use_ubsan', 'Use LLVM/GCC compiler undefined behavior sanitizer (UBSAN)', False),
        BoolVariable('use_asan', 'Use LLVM/GCC compiler address sanitizer (ASAN))', False),
        BoolVariable('use_tsan', 'Use LLVM/GCC compiler thread sanitizer (TSAN))', False),
    ]


def get_flags():

    return [
    ]


def configure(env):

	## Build type

    if (env["target"] == "release"):
        if (env["optimize"] == "speed"): #optimize for speed (default)
            env.Prepend(CCFLAGS=['-O3', '-fomit-frame-pointer', '-ftree-vectorize', '-msse2'])
        else: #optimize for size
            env.Prepend(CCFLAGS=['-Os','-ftree-vectorize', '-msse2'])

        if (env["debug_symbols"] == "yes"):
            env.Prepend(CCFLAGS=['-g1'])
        if (env["debug_symbols"] == "full"):
            env.Prepend(CCFLAGS=['-g2'])

    elif (env["target"] == "release_debug"):
        if (env["optimize"] == "speed"): #optimize for speed (default)
            env.Prepend(CCFLAGS=['-O2'])
        else: #optimize for size
            env.Prepend(CCFLAGS=['-Os'])
        env.Prepend(CPPDEFINES=['DEBUG_ENABLED'])
        if (env["debug_symbols"] == "yes"):
            env.Prepend(CCFLAGS=['-g1'])
        if (env["debug_symbols"] == "full"):
            env.Prepend(CCFLAGS=['-g2'])

    elif (env["target"] == "debug"):
        env.Prepend(CCFLAGS=['-g3'])
        env.Prepend(CPPDEFINES=['DEBUG_ENABLED', 'DEBUG_MEMORY_ENABLED'])

    ## Architecture

    # Mac OS X no longer runs on 32-bit since 10.7 which is unsupported since 2014
    # As such, we only support 64-bit
    env["bits"] = "64"

    ## Compiler configuration

    # Save this in environment for use by other modules
    if "OSXCROSS_ROOT" in os.environ:
        env["osxcross"] = True

    if not "osxcross" in env: # regular native build
        env.Append(CCFLAGS=['-arch', 'x86_64'])
        env.Append(LINKFLAGS=['-arch', 'x86_64'])
        if (env["macports_clang"] != 'no'):
            mpprefix = os.environ.get("MACPORTS_PREFIX", "/opt/local")
            mpclangver = env["macports_clang"]
            env["CC"] = mpprefix + "/libexec/llvm-" + mpclangver + "/bin/clang"
            env["LINK"] = mpprefix + "/libexec/llvm-" + mpclangver + "/bin/clang++"
            env["CXX"] = mpprefix + "/libexec/llvm-" + mpclangver + "/bin/clang++"
            env['AR'] = mpprefix + "/libexec/llvm-" + mpclangver + "/bin/llvm-ar"
            env['RANLIB'] = mpprefix + "/libexec/llvm-" + mpclangver + "/bin/llvm-ranlib"
            env['AS'] = mpprefix + "/libexec/llvm-" + mpclangver + "/bin/llvm-as"
            env.Append(CPPDEFINES=['__MACPORTS__']) #hack to fix libvpx MM256_BROADCASTSI128_SI256 define
        else:
            env['CC'] = 'clang'
            env['CXX'] = 'clang++'

        detect_darwin_sdk_path('osx', env)
        env.Append(CCFLAGS=['-isysroot', '$MACOS_SDK_PATH'])
        env.Append(LINKFLAGS=['-isysroot', '$MACOS_SDK_PATH'])

    else: # osxcross build
        root = os.environ.get("OSXCROSS_ROOT", 0)
        basecmd = root + "/target/bin/x86_64-apple-" + env["osxcross_sdk"] + "-"

        ccache_path = os.environ.get("CCACHE")
        if ccache_path is None:
            env['CC'] = basecmd + "cc"
            env['CXX'] = basecmd + "c++"
        else:
            # there aren't any ccache wrappers available for OS X cross-compile,
            # to enable caching we need to prepend the path to the ccache binary
            env['CC'] = ccache_path + ' ' + basecmd + "cc"
            env['CXX'] = ccache_path + ' ' + basecmd + "c++"
        env['AR'] = basecmd + "ar"
        env['RANLIB'] = basecmd + "ranlib"
        env['AS'] = basecmd + "as"
        env.Append(CPPDEFINES=['__MACPORTS__']) #hack to fix libvpx MM256_BROADCASTSI128_SI256 define

    if (env["CXX"] == "clang++"):
        env.Append(CPPDEFINES=['TYPED_METHOD_BIND'])
        env["CC"] = "clang"
        env["LINK"] = "clang++"

    if env['use_ubsan'] or env['use_asan'] or env['use_tsan']:
        env.extra_suffix += "s"

        if env['use_ubsan']:
            env.Append(CCFLAGS=['-fsanitize=undefined'])
            env.Append(LINKFLAGS=['-fsanitize=undefined'])

        if env['use_asan']:
            env.Append(CCFLAGS=['-fsanitize=address'])
            env.Append(LINKFLAGS=['-fsanitize=address'])

        if env['use_tsan']:
            env.Append(CCFLAGS=['-fsanitize=thread'])
            env.Append(LINKFLAGS=['-fsanitize=thread'])

    ## Dependencies

    if env['builtin_libtheora']:
        env["x86_libtheora_opt_gcc"] = True

    ## Flags

    env.Prepend(CPPPATH=['#platform/osx'])
    env.Append(CPPDEFINES=['OSX_ENABLED', 'UNIX_ENABLED', 'APPLE_STYLE_KEYS', 'COREAUDIO_ENABLED', 'COREMIDI_ENABLED'])
    env.AppendUnique(FRAMEWORKS=['Cocoa', 'Carbon', 'AudioUnit', 'CoreAudio', 'CoreMIDI', 'IOKit', 'ForceFeedback', 'CoreVideo', 'AVFoundation', 'CoreMedia'])
    env.Append(LIBS=['pthread', 'z'])

    env.Append(CPPDEFINES=['VULKAN_ENABLED'])
    env.AppendUnique(FRAMEWORKS=['Metal', 'QuartzCore', 'IOSurface'])
    if (env['use_static_mvk']):
        env.AppendUnique(FRAMEWORKS=['MoltenVK'])
        env['builtin_vulkan'] = False
    elif not env['builtin_vulkan']:
        env.Append(LIBS=['vulkan'])

    #env.Append(CPPDEFINES=['GLES_ENABLED', 'OPENGL_ENABLED'])

    env.Append(CCFLAGS=['-mmacosx-version-min=10.12'])
    env.Append(LINKFLAGS=['-mmacosx-version-min=10.12'])