import time
import traceback
from threading import Thread
from typing import Callable, Optional

from modules.text_generation import get_encoded_length


def build_parameters(body):
    prompt = body['prompt']

    prompt_lines = [k.strip() for k in prompt.split('\n')]
    max_context = body.get('max_context_length', 2048)
    while len(prompt_lines) >= 0 and get_encoded_length('\n'.join(prompt_lines)) > max_context:
        prompt_lines.pop(0)

    prompt = '\n'.join(prompt_lines)

    generate_params = {
        'max_new_tokens': int(body.get('max_new_tokens', body.get('max_length', 200))),
        'do_sample': bool(body.get('do_sample', True)),
        'temperature': float(body.get('temperature', 0.5)),
        'top_p': float(body.get('top_p', 1)),
        'typical_p': float(body.get('typical_p', body.get('typical', 1))),
        'repetition_penalty': float(body.get('repetition_penalty', body.get('rep_pen', 1.1))),
        'encoder_repetition_penalty': float(body.get('encoder_repetition_penalty', 1.0)),
        'top_k': int(body.get('top_k', 0)),
        'min_length': int(body.get('min_length', 0)),
        'no_repeat_ngram_size': int(body.get('no_repeat_ngram_size', 0)),
        'num_beams': int(body.get('num_beams', 1)),
        'penalty_alpha': float(body.get('penalty_alpha', 0)),
        'length_penalty': float(body.get('length_penalty', 1)),
        'early_stopping': bool(body.get('early_stopping', False)),
        'seed': int(body.get('seed', -1)),
        'add_bos_token': bool(body.get('add_bos_token', True)),
        'truncation_length': int(body.get('truncation_length', 2048)),
        'ban_eos_token': bool(body.get('ban_eos_token', False)),
        'skip_special_tokens': bool(body.get('skip_special_tokens', True)),
        'custom_stopping_strings': '',  # leave this blank
        'stopping_strings': body.get('stopping_strings', []),
    }

    return generate_params


def try_start_cloudflared(port: int, max_attempts: int = 3, on_start: Optional[Callable[[str], None]] = None):
    Thread(target=_start_cloudflared, args=[
           port, max_attempts, on_start], daemon=True).start()


def _start_cloudflared(port: int, max_attempts: int = 3, on_start: Optional[Callable[[str], None]] = None):
    try:
        from flask_cloudflared import _run_cloudflared
    except ImportError:
        print('You should install flask_cloudflared manually')
        raise Exception(
            'flask_cloudflared not installed. Make sure you installed the requirements.txt for this extension.')

    for _ in range(max_attempts):
        try:
            public_url = _run_cloudflared(port, port + 1)

            if on_start:
                on_start(public_url)

            return
        except Exception:
            traceback.print_exc()
            time.sleep(3)

        raise Exception('Could not start cloudflared.')