import os
import struct
import sys

from tools import align_byte_size, get_alignment

def resource_path(relative_path: str = "") -> str:
    """ Get absolute path to resource, works for dev and for cx_freeze """
    if getattr(sys, "frozen", False):
        # The application is frozen
        base_path = os.path.dirname(sys.executable)
    else:
        base_path = os.path.dirname(os.path.abspath(__file__))
        
    return os.path.join(base_path, relative_path)

def get_program_folder(folder: str = "") -> str:
    """ Get path to appdata """
    if sys.platform == "win32":
        datapath = os.path.join(os.getenv("APPDATA"), folder)
    elif sys.platform == "darwin":
        if folder:
            folder = "." + folder
        datapath = os.path.join(os.path.expanduser("~"), "Library", "Application Support", folder)
    elif "linux" in sys.platform:
        if folder:
            folder = "." + folder
        datapath = os.path.join(os.getenv("HOME"), folder)
    else:
        raise NotImplementedError(f"{sys.platform} OS is unsupported")
    return datapath

def read_sbyte(f):
    return struct.unpack("b", f.read(1))[0]

def write_sbyte(f, val):
    f.write(struct.pack("b", val))

def read_sint16(f):
    return struct.unpack(">h", f.read(2))[0]

def write_sint16(f, val):
    f.write(struct.pack(">h", val))

def read_sint32(f):
    return struct.unpack(">i", f.read(4))[0]

def write_sint32(f, val):
    f.write(struct.pack(">i", val))

def read_ubyte(f):
    return struct.unpack("B", f.read(1))[0]

def write_ubyte(f, val):
    f.write(struct.pack("B", val))

def read_uint16(f):
    return struct.unpack(">H", f.read(2))[0]

def write_uint16(f, val):
    f.write(struct.pack(">H", val))

def read_uint32(f):
    return struct.unpack(">I", f.read(4))[0]

def write_uint32(f, val):
    f.write(struct.pack(">I", val))

def read_float(f):
    return struct.unpack(">f", f.read(4))[0]

def write_float(f, val):
    f.write(struct.pack(">f", val))

def read_double(f):
    return struct.unpack(">d", f.read(4))[0]

def write_double(f, val):
    f.write(struct.pack(">d", val))

def read_bool(f, vSize=1):
    return struct.unpack("B", f.read(vSize))[0] > 0

def write_bool(f, val, vSize=1):
    if val is True: f.write(b'\x00'*(vSize-1) + b'\x01')
    else: f.write(b'\x00' * vSize)