from base64 import b64encode
from functools import wraps
from hashlib import sha1
from hmac import new as hmac_new

from flask import abort, current_app, request

from extensions.ext_database import db
from models.model import EndUser


def inner_api_only(view):
    @wraps(view)
    def decorated(*args, **kwargs):
        if not current_app.config['INNER_API']:
            abort(404)

        # get header 'X-Inner-Api-Key'
        inner_api_key = request.headers.get('X-Inner-Api-Key')
        if not inner_api_key or inner_api_key != current_app.config['INNER_API_KEY']:
            abort(404)

        return view(*args, **kwargs)
    
    return decorated

def inner_api_user_auth(view):
    @wraps(view)
    def decorated(*args, **kwargs):
        if not current_app.config['INNER_API']:
            return view(*args, **kwargs)
        
        # get header 'X-Inner-Api-Key'
        authorization = request.headers.get('Authorization')
        if not authorization:
            return view(*args, **kwargs)

        parts = authorization.split(':')
        if len(parts) != 2:
            return view(*args, **kwargs)

        user_id, token = parts
        if ' ' in user_id:
            user_id = user_id.split(' ')[1]

        inner_api_key = request.headers.get('X-Inner-Api-Key')

        data_to_sign = f'DIFY {user_id}'

        signature = hmac_new(inner_api_key.encode('utf-8'), data_to_sign.encode('utf-8'), sha1)
        signature = b64encode(signature.digest()).decode('utf-8')

        if signature != token:
            return view(*args, **kwargs)

        kwargs['user'] = db.session.query(EndUser).filter(EndUser.id == user_id).first()

        return view(*args, **kwargs)
    
    return decorated