import sys, os, gc, optparse, logging, time
from cffi import FFI
import datetime, platform

SCREEN_PATH="/home/pi/3dscreen"

ffi = FFI()
lib = None

def load():
    global lib

    ffi.cdef("""
        char* Klippy_Get_Autosave_Filename();
        char* Klippy_Autosave_Read();
        bool Klippy_Autosave_Write(char*);
        void free(void*);
    """)

    arch = platform.machine()
    if arch == "aarch64":
        lib = ffi.dlopen(SCREEN_PATH+"/lib/lib3dscreen-arm64.so")
    elif arch == "armv7l":
        lib = ffi.dlopen(SCREEN_PATH+"/lib/lib3dscreen.so")
    else:
        lib = ffi.dlopen("/lib/lib3dscreen-host.so")

def Klippy_Get_Autosave_Filename():
    res = lib.Klippy_Get_Autosave_Filename()
    s = ffi.string(res).decode("utf-8")
    lib.free(res)
    return s

def Klippy_Autosave_Read():
    res = lib.Klippy_Autosave_Read()
    s = ffi.string(res).decode("utf-8")
    lib.free(res)
    return s

def Klippy_Autosave_Write(data):
    b = data.encode('utf-8')
    res = lib.Klippy_Autosave_Write(b)
    return res