import os
import sys
import string


def is_active():
    return True


def get_name():
    return "JavaScript"


def can_build():

    import os
    if (not os.environ.has_key("EMSCRIPTEN_ROOT")):
        return False
    return True


def get_opts():

    return [
        ['wasm', 'Compile to WebAssembly', 'no'],
        ['javascript_eval', 'Enable JavaScript eval interface', 'yes'],
    ]


def get_flags():

    return [
        ('tools', 'no'),
        ('module_etc1_enabled', 'no'),
        ('module_mpc_enabled', 'no'),
        ('module_theora_enabled', 'no'),
    ]


def configure(env):
    env['ENV'] = os.environ
    env.use_windows_spawn_fix('javascript')

    env.Append(CPPPATH=['#platform/javascript'])

    em_path = os.environ["EMSCRIPTEN_ROOT"]

    env['ENV']['PATH'] = em_path + ":" + env['ENV']['PATH']
    env['CC'] = em_path + '/emcc'
    env['CXX'] = em_path + '/emcc'
    #env['AR'] = em_path+"/emar"
    env['AR'] = em_path + "/emcc"
    env['ARFLAGS'] = "-o"

#	env['RANLIB'] = em_path+"/emranlib"
    env['RANLIB'] = em_path + "/emcc"
    env['OBJSUFFIX'] = '.bc'
    env['LIBSUFFIX'] = '.bc'
    env['CCCOM'] = "$CC -o $TARGET $CFLAGS $CCFLAGS $_CCCOMCOM $SOURCES"
    env['CXXCOM'] = "$CC -o $TARGET $CFLAGS $CCFLAGS $_CCCOMCOM $SOURCES"

#	env.Append(LIBS=['c','m','stdc++','log','GLESv1_CM','GLESv2'])

#	env["LINKFLAGS"]= string.split(" -g --sysroot="+ld_sysroot+" -Wl,--no-undefined -Wl,-z,noexecstack ")

    if (env["target"] == "release"):
        env.Append(CCFLAGS=['-O2'])
    elif (env["target"] == "release_debug"):
        env.Append(CCFLAGS=['-O2', '-DDEBUG_ENABLED'])
    elif (env["target"] == "debug"):
        env.Append(CCFLAGS=['-D_DEBUG', '-Wall', '-O2', '-DDEBUG_ENABLED'])
        #env.Append(CCFLAGS=['-D_DEBUG', '-Wall', '-g4', '-DDEBUG_ENABLED'])
        env.Append(CPPFLAGS=['-DDEBUG_MEMORY_ALLOC'])

    # TODO: Move that to opus module's config
    if("module_opus_enabled" in env and env["module_opus_enabled"] != "no"):
        env.opus_fixed_point = "yes"

    # These flags help keep the file size down
    env.Append(CPPFLAGS=["-fno-exceptions", '-DNO_SAFE_CAST', '-fno-rtti'])
    env.Append(CPPFLAGS=['-DJAVASCRIPT_ENABLED', '-DUNIX_ENABLED', '-DPTHREAD_NO_RENAME', '-DNO_FCNTL', '-DMPC_FIXED_POINT', '-DTYPED_METHOD_BIND', '-DNO_THREADS'])
    env.Append(CPPFLAGS=['-DGLES2_ENABLED'])
    env.Append(CPPFLAGS=['-DGLES_NO_CLIENT_ARRAYS'])
#	env.Append(CPPFLAGS=['-DANDROID_ENABLED', '-DUNIX_ENABLED','-DMPC_FIXED_POINT'])

    if env['wasm'] == 'yes':
        env.Append(LINKFLAGS=['-s', 'BINARYEN=1'])
        # Maximum memory size is baked into the WebAssembly binary during
        # compilation, so we need to enable memory growth to allow setting
        # TOTAL_MEMORY at runtime. The value set at runtime must be higher than
        # what is set during compilation, check TOTAL_MEMORY in Emscripten's
        # src/settings.js for the default.
        env.Append(LINKFLAGS=['-s', 'ALLOW_MEMORY_GROWTH=1'])
        env["PROGSUFFIX"] += ".webassembly"
    else:
        env.Append(CPPFLAGS=['-s', 'ASM_JS=1'])
        env.Append(LINKFLAGS=['-s', 'ASM_JS=1'])
        env.Append(LINKFLAGS=['--separate-asm'])

    if env['javascript_eval'] == 'yes':
        env.Append(CPPFLAGS=['-DJAVASCRIPT_EVAL_ENABLED'])

    env.Append(LINKFLAGS=['-O2'])
    # env.Append(LINKFLAGS=['-g4'])

    # print "CCCOM is:", env.subst('$CCCOM')
    # print "P: ", env['p'], " Platofrm: ", env['platform']

    import methods

    env.Append(BUILDERS={'GLSL120': env.Builder(action=methods.build_legacygl_headers, suffix='glsl.h', src_suffix='.glsl')})
    env.Append(BUILDERS={'GLSL': env.Builder(action=methods.build_glsl_headers, suffix='glsl.h', src_suffix='.glsl')})
    env.Append(BUILDERS={'GLSL120GLES': env.Builder(action=methods.build_gles2_headers, suffix='glsl.h', src_suffix='.glsl')})
    #env.Append( BUILDERS = { 'HLSL9' : env.Builder(action = methods.build_hlsl_dx9_headers, suffix = 'hlsl.h',src_suffix = '.hlsl') } )