from flask import Blueprint, jsonify, request,make_response,redirect,url_for,render_template,current_app
from .Jsonfile import JSONfile
from .emission import Emmission
import jwt
from functools import wraps  
from datetime import datetime, timedelta
from .user import User

data= JSONfile("chaine.json")
emmission= Emmission()

def token_required(f):  
    @wraps(f)
    def _verify(*args, **kwargs):
        auth_headers = request.headers.get('Authorization', '').split()
        invalid_msg = {
            'message': 'Invalid token. Registeration and / or authentication required',
            'authenticated': False
        }
        expired_msg = {
            'message': 'Expired token. Reauthentication required.',
            'authenticated': False
        }

        if len(auth_headers) != 2:
            return jsonify(invalid_msg), 401

        try:
            token = auth_headers[1]
            data = jwt.decode(token,current_app.config['SECRET_KEY'])
            user = User
            if not user:
                raise RuntimeError('User not found')
            
            return f(user, *args, **kwargs)
        except jwt.ExpiredSignatureError:
            return jsonify(expired_msg), 401 # 401 is Unauthorized HTTP status code
        except (jwt.InvalidTokenError) as e:
            print(e)
            return jsonify(invalid_msg), 401

    return _verify


api = Blueprint("api", __name__)
@api.route('/ping', methods=['GET'])
def ping_pong():
    return jsonify('pong!')

@api.route('/chaine/<num>', methods=['GET'])
def get_chaine(num):
    chaine=data.get_chaine(num)
    if (chaine == "numero de chaine inconnue"):
        return make_response("",204)
    else:
        return jsonify(chaine)

@api.route('/chaine/', methods=['put'])
@token_required
def update_list(user):
        status=data.parsechaine()
        if(status=='ok'):
            return jsonify("OK")
        else:
            return make_response('Error during Chaine Update',500)

@api.route('/chaine/<num>/emission', methods=['GET'])
def get_emmission(num):
    chaine=data.get_chaine(num)
    if (chaine == "numero de chaine inconnue"):
        return make_response("",204)
    else:    

        return jsonify(emmission.parse_emmission(chaine))

#@api.route('/register/', methods=('POST',))
#def register():  
#    data = request.get_json()
#    user = User(**data)
#    db.session.add(user)
#    db.session.commit()
#    return jsonify(user.to_dict()), 201

@api.route('/login/', methods=('POST',))
def login():  
    data = request.get_json()
    user = User.authenticate(**data)

    if not user:
        return jsonify({ 'message': 'Invalid credentials', 'authenticated': False }), 401

    token = jwt.encode({
        'sub': user.name,
        'iat':datetime.utcnow(),
        'exp': datetime.utcnow() + timedelta(minutes=30)},
        current_app.config['SECRET_KEY'])
    return jsonify({ 'token': token.decode('UTF-8') })