import t, c
from . import syscall as syscall

def exit(code: int):
    syscall._syscall1(uint64(syscall.EXIT), uint64(code))

def yield_cpu():
    syscall._syscall2(uint64(syscall.WAIT_WINDOW), uint64(0), uint64(2))

def spawn(path: const str, blocking: int = 0) -> int:
    return int(syscall._syscall2(uint64(syscall.SPAWN), uint64(path), uint64(blocking)))

def thread_create(func: t.CPtr, arg: t.CPtr = None) -> int:
    return int(syscall._syscall2(uint64(syscall.THREAD_CREATE), uint64(func), uint64(arg)))

@t.Object
class Thread:
    _tid: int
    _func: t.CPtr
    _arg: t.CPtr
    _running: int

    def __init__(self, func: t.CPtr, arg: t.CPtr = None):
        self._func = func
        self._arg = arg
        self._tid = -1
        self._running = 0

    def start(self) -> int:
        if self._running: return -1
        self._tid = thread_create(self._func, self._arg)
        if self._tid < 0: return -1
        self._running = 1
        return 0

    def is_alive(self) -> int:
        return self._running

    def get_tid(self) -> int:
        return self._tid

@t.Object
class Process:
    _pid: int
    _path: t.CArray[char, 128]

    def __init__(self, path: const str):
        self._pid = -1
        i: int = 0
        for ch in path:
            if i >= 127: break
            self._path[i] = ch
            i += 1
        self._path[i] = 0

    def start(self) -> int:
        self._pid = spawn(&self._path[0], 0)
        return self._pid

    def start_blocking(self) -> int:
        self._pid = spawn(&self._path[0], 1)
        return self._pid

    def get_pid(self) -> int:
        return self._pid