from __future__ import annotations

import json
import os
import uuid

import requests
from Crypto.Cipher import AES

from ..typing import Any, CreateResult
from .base_provider import BaseProvider


class GetGpt(BaseProvider):
    url                   = 'https://chat.getgpt.world/'
    supports_stream       = True
    working               = True
    supports_gpt_35_turbo = True

    @staticmethod
    def create_completion(
        model: str,
        messages: list[dict[str, str]],
        stream: bool, **kwargs: Any) -> CreateResult:
        
        headers = {
            'Content-Type'  : 'application/json',
            'Referer'       : 'https://chat.getgpt.world/',
            'user-agent'    : 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36',
        }
        
        data = json.dumps(
            {
                'messages'          : messages,
                'frequency_penalty' : kwargs.get('frequency_penalty', 0),
                'max_tokens'        : kwargs.get('max_tokens', 4000),
                'model'             : 'gpt-3.5-turbo',
                'presence_penalty'  : kwargs.get('presence_penalty', 0),
                'temperature'       : kwargs.get('temperature', 1),
                'top_p'             : kwargs.get('top_p', 1),
                'stream'            : True,
                'uuid'              : str(uuid.uuid4())
            }
        )

        res = requests.post('https://chat.getgpt.world/api/chat/stream',
            headers=headers, json={'signature': _encrypt(data)}, stream=True)

        res.raise_for_status()
        for line in res.iter_lines():
            if b'content' in line:
                line_json = json.loads(line.decode('utf-8').split('data: ')[1])
                yield (line_json['choices'][0]['delta']['content'])

    @classmethod
    @property
    def params(cls):
        params = [
            ('model', 'str'),
            ('messages', 'list[dict[str, str]]'),
            ('stream', 'bool'),
            ('temperature', 'float'),
            ('presence_penalty', 'int'),
            ('frequency_penalty', 'int'),
            ('top_p', 'int'),
            ('max_tokens', 'int'),
        ]
        param = ', '.join([': '.join(p) for p in params])
        return f'g4f.provider.{cls.__name__} supports: ({param})'


def _encrypt(e: str):
    t = os.urandom(8).hex().encode('utf-8')
    n = os.urandom(8).hex().encode('utf-8')
    r = e.encode('utf-8')
    
    cipher     = AES.new(t, AES.MODE_CBC, n)
    ciphertext = cipher.encrypt(_pad_data(r))
    
    return ciphertext.hex() + t.decode('utf-8') + n.decode('utf-8')


def _pad_data(data: bytes) -> bytes:
    block_size   = AES.block_size
    padding_size = block_size - len(data) % block_size
    padding      = bytes([padding_size] * padding_size)
    
    return data + padding