import methods
import os


def is_active():
    return True


def get_name():
    return "Windows"


def can_build():
    if (os.name == "nt"):
        # Building natively on Windows
        # If VCINSTALLDIR is set in the OS environ, use traditional Godot logic to set up MSVC
        if (os.getenv("VCINSTALLDIR")): # MSVC, manual setup
            return True

        # Otherwise, let SCons find MSVC if installed, or else Mingw.
        # Since we're just returning True here, if there's no compiler
        # installed, we'll get errors when it tries to build with the
        # null compiler.
        return True

    if (os.name == "posix"):
        # Cross-compiling with MinGW-w64 (old MinGW32 is not supported)
        mingw32 = "i686-w64-mingw32-"
        mingw64 = "x86_64-w64-mingw32-"

        if (os.getenv("MINGW32_PREFIX")):
            mingw32 = os.getenv("MINGW32_PREFIX")
        if (os.getenv("MINGW64_PREFIX")):
            mingw64 = os.getenv("MINGW64_PREFIX")

        test = "gcc --version > /dev/null 2>&1"
        if (os.system(mingw64 + test) == 0 or os.system(mingw32 + test) == 0):
            return True

    return False


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

    mingw32 = ""
    mingw64 = ""
    if (os.name == "posix"):
        mingw32 = "i686-w64-mingw32-"
        mingw64 = "x86_64-w64-mingw32-"

    if (os.getenv("MINGW32_PREFIX")):
        mingw32 = os.getenv("MINGW32_PREFIX")
    if (os.getenv("MINGW64_PREFIX")):
        mingw64 = os.getenv("MINGW64_PREFIX")

    return [
        ('mingw_prefix_32', 'MinGW prefix (Win32)', mingw32),
        ('mingw_prefix_64', 'MinGW prefix (Win64)', mingw64),
        # Targeted Windows version: 7 (and later), minimum supported version
        # XP support dropped after EOL due to missing API for IPv6 and other issues
        # Vista support dropped after EOL due to GH-10243
        ('target_win_version', 'Targeted Windows version, >= 0x0601 (Windows 7)', '0x0601'),
        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),
        ('msvc_version', 'MSVC version to use. Ignored if VCINSTALLDIR is set in shell env.', None),
        BoolVariable('use_mingw', 'Use the Mingw compiler, even if MSVC is installed. Only used on Windows.', False),
        BoolVariable('use_llvm', 'Use the LLVM compiler', False),
        BoolVariable('use_thinlto', 'Use ThinLTO', False),
    ]


def get_flags():

    return [
    ]


def build_res_file(target, source, env):

    if (env["bits"] == "32"):
        cmdbase = env['mingw_prefix_32']
    else:
        cmdbase = env['mingw_prefix_64']
    cmdbase = cmdbase + 'windres --include-dir . '
    import subprocess
    for x in range(len(source)):
        cmd = cmdbase + '-i ' + str(source[x]) + ' -o ' + str(target[x])
        try:
            out = subprocess.Popen(cmd, shell=True, stderr=subprocess.PIPE).communicate()
            if len(out[1]):
                return 1
        except:
            return 1
    return 0


def setup_msvc_manual(env):
    """Set up env to use MSVC manually, using VCINSTALLDIR"""
    if (env["bits"] != "default"):
        print("""
            Bits argument is not supported for MSVC compilation. Architecture depends on the Native/Cross Compile Tools Prompt/Developer Console
            (or Visual Studio settings) that is being used to run SCons. As a consequence, bits argument is disabled. Run scons again without bits
            argument (example: scons p=windows) and SCons will attempt to detect what MSVC compiler will be executed and inform you.
            """)
        raise SCons.Errors.UserError("Bits argument should not be used when using VCINSTALLDIR")

    # Force bits arg
    # (Actually msys2 mingw can support 64-bit, we could detect that)
    env["bits"] = "32"
    env["x86_libtheora_opt_vc"] = True

    # find compiler manually
    compiler_version_str = methods.detect_visual_c_compiler_version(env['ENV'])
    print("Found MSVC compiler: " + compiler_version_str)

    # If building for 64bit architecture, disable assembly optimisations for 32 bit builds (theora as of writing)... vc compiler for 64bit can not compile _asm
    if(compiler_version_str == "amd64" or compiler_version_str == "x86_amd64"):
        env["bits"] = "64"
        env["x86_libtheora_opt_vc"] = False
        print("Compiled program architecture will be a 64 bit executable (forcing bits=64).")
    elif (compiler_version_str == "x86" or compiler_version_str == "amd64_x86"):
        print("Compiled program architecture will be a 32 bit executable. (forcing bits=32).")
    else:
        print("Failed to manually detect MSVC compiler architecture version... Defaulting to 32bit executable settings (forcing bits=32). Compilation attempt will continue, but SCons can not detect for what architecture this build is compiled for. You should check your settings/compilation setup, or avoid setting VCINSTALLDIR.")

def setup_msvc_auto(env):
    """Set up MSVC using SCons's auto-detection logic"""

    # If MSVC_VERSION is set by SCons, we know MSVC is installed.
    # But we may want a different version or target arch.

    # The env may have already been set up with default MSVC tools, so
    # reset a few things so we can set it up with the tools we want.
    # (Ideally we'd decide on the tool config before configuring any
    # environment, and just set the env up once, but this function runs
    # on an existing env so this is the simplest way.)
    env['MSVC_SETUP_RUN'] = False # Need to set this to re-run the tool
    env['MSVS_VERSION'] = None
    env['MSVC_VERSION'] = None
    env['TARGET_ARCH'] = None
    if env['bits'] != 'default':
        env['TARGET_ARCH'] = {'32': 'x86', '64': 'x86_64'}[env['bits']]
    if env.has_key('msvc_version'):
           env['MSVC_VERSION'] = env['msvc_version']
    env.Tool('msvc')
    env.Tool('mssdk')                      # we want the MS SDK
    # Note: actual compiler version can be found in env['MSVC_VERSION'], e.g. "14.1" for VS2015
    # Get actual target arch into bits (it may be "default" at this point):
    if env['TARGET_ARCH'] in ('amd64', 'x86_64'):
        env['bits'] = '64'
    else:
        env['bits'] = '32'
    print("Found MSVC version %s, arch %s, bits=%s" % (env['MSVC_VERSION'], env['TARGET_ARCH'], env['bits']))
    if env['TARGET_ARCH'] in ('amd64', 'x86_64'):
        env["x86_libtheora_opt_vc"] = False

def setup_mingw(env):
    """Set up env for use with mingw"""
    # Nothing to do here
    print("Using MinGW")
    pass

def configure_msvc(env, manual_msvc_config):
    """Configure env to work with MSVC"""

    # Build type

    if (env["target"] == "release"):
        if (env["optimize"] == "speed"): #optimize for speed (default)
            env.Append(CCFLAGS=['/O2'])
        else: # optimize for size
            env.Append(CCFLAGS=['/O1'])
        env.Append(LINKFLAGS=['/SUBSYSTEM:WINDOWS'])
        env.Append(LINKFLAGS=['/ENTRY:mainCRTStartup'])
        env.Append(LINKFLAGS=['/OPT:REF'])

    elif (env["target"] == "release_debug"):
        if (env["optimize"] == "speed"): #optimize for speed (default)
            env.Append(CCFLAGS=['/O2'])
        else: # optimize for size
            env.Append(CCFLAGS=['/O1'])
        env.AppendUnique(CPPDEFINES = ['DEBUG_ENABLED'])
        env.Append(LINKFLAGS=['/SUBSYSTEM:CONSOLE'])
        env.Append(LINKFLAGS=['/OPT:REF'])

    elif (env["target"] == "debug"):
        env.AppendUnique(CCFLAGS=['/Z7', '/Od', '/EHsc'])
        env.AppendUnique(CPPDEFINES = ['DEBUG_ENABLED', 'DEBUG_MEMORY_ENABLED',
                                       'D3D_DEBUG_INFO'])
        env.Append(LINKFLAGS=['/SUBSYSTEM:CONSOLE'])
        env.Append(LINKFLAGS=['/DEBUG'])

    if (env["debug_symbols"] == "full" or env["debug_symbols"] == "yes"):
        env.AppendUnique(CCFLAGS=['/Z7'])
        env.AppendUnique(LINKFLAGS=['/DEBUG'])

    ## Compile/link flags

    env.AppendUnique(CCFLAGS=['/MT', '/Gd', '/GR', '/nologo'])
    if int(env['MSVC_VERSION'].split('.')[0]) >= 14: #vs2015 and later
        env.AppendUnique(CCFLAGS=['/utf-8'])
    env.AppendUnique(CXXFLAGS=['/TP']) # assume all sources are C++
    if manual_msvc_config: # should be automatic if SCons found it
        if os.getenv("WindowsSdkDir") is not None:
            env.Prepend(CPPPATH=[os.getenv("WindowsSdkDir") + "/Include"])
        else:
            print("Missing environment variable: WindowsSdkDir")

    env.AppendUnique(CPPDEFINES = ['WINDOWS_ENABLED',
                                   'WASAPI_ENABLED', 'WINMIDI_ENABLED',
                                   'TYPED_METHOD_BIND',
                                   'WIN32', 'MSVC',
                                   'WINVER=%s' % env["target_win_version"],
                                   '_WIN32_WINNT=%s' % env["target_win_version"]])
    env.AppendUnique(CPPDEFINES=['NOMINMAX']) # disable bogus min/max WinDef.h macros
    if env["bits"] == "64":
        env.AppendUnique(CPPDEFINES=['_WIN64'])

    ## Libs

    LIBS = ['winmm', 'dsound', 'kernel32', 'ole32', 'oleaut32',
            'user32', 'gdi32', 'IPHLPAPI', 'Shlwapi', 'wsock32', 'Ws2_32',
            'shell32', 'advapi32', 'dinput8', 'dxguid', 'imm32', 'bcrypt', 'Avrt',
            'dwmapi']

    env.AppendUnique(CPPDEFINES=['VULKAN_ENABLED'])
    if not env['builtin_vulkan']:
        LIBS += ['vulkan']
    else:
        LIBS += ['cfgmgr32']

    #env.AppendUnique(CPPDEFINES = ['OPENGL_ENABLED'])
    LIBS += ['opengl32']

    env.Append(LINKFLAGS=[p + env["LIBSUFFIX"] for p in LIBS])

    if manual_msvc_config:
        if os.getenv("WindowsSdkDir") is not None:
            env.Append(LIBPATH=[os.getenv("WindowsSdkDir") + "/Lib"])
        else:
            print("Missing environment variable: WindowsSdkDir")

    ## LTO

    if (env["use_lto"]):
        env.AppendUnique(CCFLAGS=['/GL'])
        env.AppendUnique(ARFLAGS=['/LTCG'])
        if env["progress"]:
            env.AppendUnique(LINKFLAGS=['/LTCG:STATUS'])
        else:
            env.AppendUnique(LINKFLAGS=['/LTCG'])

    if manual_msvc_config:
        env.Prepend(CPPPATH=[p for p in os.getenv("INCLUDE").split(";")])
        env.Append(LIBPATH=[p for p in os.getenv("LIB").split(";")])

    # Incremental linking fix
    env['BUILDERS']['ProgramOriginal'] = env['BUILDERS']['Program']
    env['BUILDERS']['Program'] = methods.precious_program

def configure_mingw(env):
    # Workaround for MinGW. See:
    # http://www.scons.org/wiki/LongCmdLinesOnWin32
    env.use_windows_spawn_fix()

    ## Build type

    if (env["target"] == "release"):
        env.Append(CCFLAGS=['-msse2'])

        if (env["optimize"] == "speed"): #optimize for speed (default)
            if (env["bits"] == "64"):
                env.Append(CCFLAGS=['-O3'])
            else:
                env.Append(CCFLAGS=['-O2'])
        else: #optimize for size
            env.Prepend(CCFLAGS=['-Os'])


        env.Append(LINKFLAGS=['-Wl,--subsystem,windows'])

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

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

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

    ## Compiler configuration

    if os.name != "nt":
        env["PROGSUFFIX"] = env["PROGSUFFIX"] + ".exe"  # for linux cross-compilation

    if (env["bits"] == "default"):
        if (os.name == "nt"):
            env["bits"] = "64" if "PROGRAMFILES(X86)" in os.environ else "32"
        else: # default to 64-bit on Linux
            env["bits"] = "64"

    mingw_prefix = ""

    if (env["bits"] == "32"):
        env.Append(LINKFLAGS=['-static'])
        env.Append(LINKFLAGS=['-static-libgcc'])
        env.Append(LINKFLAGS=['-static-libstdc++'])
        mingw_prefix = env["mingw_prefix_32"]
    else:
        env.Append(LINKFLAGS=['-static'])
        mingw_prefix = env["mingw_prefix_64"]

    if env['use_llvm']:
        env["CC"] = mingw_prefix + "clang"
        env['AS'] = mingw_prefix + "as"
        env["CXX"] = mingw_prefix + "clang++"
        env['AR'] = mingw_prefix + "ar"
        env['RANLIB'] = mingw_prefix + "ranlib"
        env["LINK"] = mingw_prefix + "clang++"
    else:
        env["CC"] = mingw_prefix + "gcc"
        env['AS'] = mingw_prefix + "as"
        env['CXX'] = mingw_prefix + "g++"
        env['AR'] = mingw_prefix + "gcc-ar"
        env['RANLIB'] = mingw_prefix + "gcc-ranlib"
        env['LINK'] = mingw_prefix + "g++"
    env["x86_libtheora_opt_gcc"] = True

    if env['use_lto']:
        if not env['use_llvm'] and env.GetOption("num_jobs") > 1:
            env.Append(CCFLAGS=['-flto'])
            env.Append(LINKFLAGS=['-flto=' + str(env.GetOption("num_jobs"))])
        else:
            if env['use_thinlto']:
                env.Append(CCFLAGS=['-flto=thin'])
                env.Append(LINKFLAGS=['-flto=thin'])
            else:
                env.Append(CCFLAGS=['-flto'])
                env.Append(LINKFLAGS=['-flto'])


    ## Compile flags

    env.Append(CCFLAGS=['-mwindows'])

    env.Append(CPPDEFINES=['WINDOWS_ENABLED', 'WASAPI_ENABLED', 'WINMIDI_ENABLED'])
    env.Append(CPPDEFINES=[('WINVER', env['target_win_version']), ('_WIN32_WINNT', env['target_win_version'])])
    env.Append(LIBS=['mingw32', 'dsound', 'ole32', 'd3d9', 'winmm', 'gdi32', 'iphlpapi', 'shlwapi', 'wsock32', 'ws2_32', 'kernel32', 'oleaut32', 'dinput8', 'dxguid', 'ksuser', 'imm32', 'bcrypt', 'avrt', 'uuid', 'dwmapi'])

    env.Append(CPPDEFINES=['VULKAN_ENABLED'])
    if not env['builtin_vulkan']:
        env.Append(LIBS=['vulkan'])
    else:
        env.Append(LIBS=['cfgmgr32'])

    ## TODO !!! Reenable when OpenGLES Rendering Device is implemented !!!
    #env.Append(CPPDEFINES=['OPENGL_ENABLED'])
    env.Append(LIBS=['opengl32'])

    env.Append(CPPDEFINES=['MINGW_ENABLED', ('MINGW_HAS_SECURE_API', 1)])

    # resrc
    env.Append(BUILDERS={'RES': env.Builder(action=build_res_file, suffix='.o', src_suffix='.rc')})

def configure(env):
    # At this point the env has been set up with basic tools/compilers.
    env.Prepend(CPPPATH=['#platform/windows'])

    print("Configuring for Windows: target=%s, bits=%s" % (env['target'], env['bits']))

    if (os.name == "nt"):
        env['ENV'] = os.environ # this makes build less repeatable, but simplifies some things
        env['ENV']['TMP'] = os.environ['TMP']

    # First figure out which compiler, version, and target arch we're using
    if os.getenv("VCINSTALLDIR") and not env["use_mingw"]:
        # Manual setup of MSVC
        setup_msvc_manual(env)
        env.msvc = True
        manual_msvc_config = True
    elif env.get('MSVC_VERSION', '') and not env["use_mingw"]:
        setup_msvc_auto(env)
        env.msvc = True
        manual_msvc_config = False
    else:
        setup_mingw(env)
        env.msvc = False

    # Now set compiler/linker flags
    if env.msvc:
        configure_msvc(env, manual_msvc_config)

    else: # MinGW
        configure_mingw(env)