import tiktoken
import hashlib
from flask import jsonify, make_response


_encoding = None


def get_encoding():
    global _encoding
    if _encoding is None:
        _encoding = tiktoken.get_encoding("cl100k_base")
    return _encoding


def num_tokens_from_string(string: str) -> int:
    encoding = get_encoding()
    if isinstance(string, str):
        num_tokens = len(encoding.encode(string))
        return num_tokens
    else:
        return 0

def num_tokens_from_object_or_list(thing):
    if isinstance(thing, list):
        return sum([num_tokens_from_object_or_list(x) for x in thing])
    elif isinstance(thing, dict):
        return sum([num_tokens_from_object_or_list(x) for x in thing.values()])
    elif isinstance(thing, str):
        return num_tokens_from_string(thing)
    else:
        return 0

def count_tokens_docs(docs):
    docs_content = ""
    for doc in docs:
        docs_content += doc.page_content

    tokens = num_tokens_from_string(docs_content)
    return tokens


def check_required_fields(data, required_fields):
    missing_fields = [field for field in required_fields if field not in data]
    if missing_fields:
        return make_response(
            jsonify(
                {
                    "success": False,
                    "message": f"Missing fields: {', '.join(missing_fields)}",
                }
            ),
            400,
        )
    return None


def get_hash(data):
    return hashlib.md5(data.encode()).hexdigest()