import os
import sys
import re
import torch
import transformers
import traceback

from queue import Queue
from threading import Thread


def post_process_output(text):
    text = text.strip()
    pattern = re.compile(
        r"<unk>|<pad>|<s>|</s>|\[PAD\]|<\|endoftext\|>|\[UNK\]|\[CLS\]|\[MASK\]|<\|startofpiece\|>|<\|endofpiece\|>|\[gMASK\]|\[sMASK\]"
    )
    text = pattern.sub("", text.strip()).strip()
    return text


def post_process_code(code):
    sep = "\n```"
    if sep in code:
        blocks = code.split(sep)
        if len(blocks) % 2 == 1:
            for i in range(1, len(blocks), 2):
                blocks[i] = blocks[i].replace("\\_", "_")
        code = sep.join(blocks)
    return code


class Stream(transformers.StoppingCriteria):
    def __init__(self, callback_func=None):
        self.callback_func = callback_func

    def __call__(self, input_ids, scores) -> bool:
        if self.callback_func is not None:
            self.callback_func(input_ids[0])
        return False


class Iteratorize:

    """
    Transforms a function that takes a callback
    into a lazy iterator (generator).
    """

    def __init__(self, func, kwargs={}, callback=None):
        self.mfunc = func
        self.c_callback = callback
        self.q = Queue()
        self.sentinel = object()
        self.kwargs = kwargs
        self.stop_now = False

        def _callback(val):
            if self.stop_now:
                raise ValueError
            self.q.put(val)

        def gentask():
            try:
                ret = self.mfunc(callback=_callback, **self.kwargs)
            except ValueError:
                pass
            except:
                traceback.print_exc()
                pass

            self.q.put(self.sentinel)
            if self.c_callback:
                self.c_callback(ret)

        self.thread = Thread(target=gentask)
        self.thread.start()

    def __iter__(self):
        return self

    def __next__(self):
        obj = self.q.get(True, None)
        if obj is self.sentinel:
            raise StopIteration
        else:
            return obj

    def __enter__(self):
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        self.stop_now = True