import ctypes
import platform


def load_dll():
    """auto-detect the correct library"""

    if (platform.system() == "Windows") or (platform.system()[0:6] == "CYGWIN"):
        if ctypes.sizeof(ctypes.c_voidp) == 4:
            # WINDOWS 32bit
            t32api = ctypes.CDLL("./t32api.dll")
            # alternative using windows DLL search order:
            # t32api = ctypes.cdll.t32api
        else:
            # WINDOWS 64bit
            t32api = ctypes.CDLL("./t32api64.dll")
            # alternative using windows DLL search order:
            # t32api = ctypes.cdll.t32api64
    elif platform.system() == "Darwin":
        # Mac OS X
        t32api = ctypes.CDLL("./t32api.dylib")
    else:
        if ctypes.sizeof(ctypes.c_voidp) == 4:
            # Linux 32bit
            t32api = ctypes.CDLL("./t32api.so")
        else:
            # Linux 64bit
            t32api = ctypes.CDLL("./t32api64.so")
    return t32api


def declare_fnc_args_ret(t32api):
    """declare the argument- and return-types of the functions used in this file"""

    t32api.T32_Config.argtypes = [ctypes.POINTER(ctypes.c_char)]
    t32api.T32_Config.restype = ctypes.c_int
    t32api.T32_Init.argtypes = []
    t32api.T32_Init.restype = ctypes.c_int
    t32api.T32_Attach.argtypes = [ctypes.c_int]
    t32api.T32_Attach.restype = ctypes.c_int
    t32api.T32_Ping.argtypes = []
    t32api.T32_Ping.restype = ctypes.c_int
    t32api.T32_Exit.argtypes = []
    t32api.T32_Exit.restype = ctypes.c_int
    t32api.T32_ExecuteCommand.argtypes = [ctypes.POINTER(ctypes.c_char), ctypes.POINTER(ctypes.c_char), ctypes.c_uint32]
    t32api.T32_ExecuteCommand.restype = ctypes.c_int
    t32api.T32_ExecuteFunction.argtypes = [
        ctypes.POINTER(ctypes.c_char),
        ctypes.POINTER(ctypes.c_char),
        ctypes.c_uint32,
        ctypes.POINTER(ctypes.c_uint32),
    ]
    t32api.T32_ExecuteFunction.restype = ctypes.c_int

    # channel related
    t32api.T32_RequestChannelNetAssist.argtypes = [ctypes.POINTER(ctypes.c_void_p)]
    t32api.T32_RequestChannelNetAssist.restype = None
    t32api.T32_RequestChannelNetTcp.argtypes = [ctypes.POINTER(ctypes.c_void_p)]
    t32api.T32_RequestChannelNetTcp.restype = None
    t32api.T32_ReleaseChannel.argtypes = [ctypes.POINTER(ctypes.c_void_p)]
    t32api.T32_ReleaseChannel.restype = None
    t32api.T32_SetChannel.argtypes = [ctypes.c_void_p]
    t32api.T32_SetChannel.restype = None