# -*- encoding: utf-8 -*-

# @author : vincent.benoit@benserv.fr
# @brief : Params routes

#########################################################
# Importation de modules externes                       #

import sys, re, os
import logging as log
from datetime import datetime, timezone

from flask import Flask, Blueprint, request, abort, jsonify, current_app
from flask_api import status
from flask_jwt_extended import create_access_token
from flask_jwt_extended import get_jwt
from flask_jwt_extended import set_access_cookies
from flask_jwt_extended import unset_jwt_cookies
from flask_jwt_extended import get_jwt_identity
from flask_jwt_extended import jwt_required

import json
import shutil
import hashlib
from werkzeug.exceptions import HTTPException

from ConfBack.manager import Sock

#########################################################
# Class et Methods                                      #

params = Blueprint('params', __name__, url_prefix='/api/configurateur')

@params.errorhandler(HTTPException)
def handle_exception(e):
    ''' return JSON instead of HTML for HTTP errors '''
    response = e.get_response()
    # replace the body with JSON
    response.data = json.dumps({
        'code': e.code,
        'name': e.name,
        'description': e.description,
        })
    response.content_type = "application/json"
    return response

@params.after_request
def refresh_expiring_tokens(response):
    ''' Using an 'after_request' callback, we refresh any token that is within
        30 minutes of expiring.'''
    try:
        exp_timestamp = get_jwt()['exp']
        now = datetime.now(timezone.utc)
        target_timestamp = datetime.timestamp(now + current_app.config['DELTA'])
        if target_timestamp > exp_timestamp:
            current_app.logger.warning("On doit recréer un token JWT ....")
            access_token = create_access_token(identity=get_jwt_identity())
            # refresh token in storage place
            if os.path.exists(os.path.join("/tmp", current_app.config['PROJECT'])):
                with open(os.path.join("/tmp", current_app.config['PROJECT'], get_jwt_identity()['id']), 'w') as f:
                    f.write(access_token)
            # Modifiy a Flask Response to set a cookie containing the access JWT.
            set_access_cookies(response, access_token)
        return response
    except (RuntimeError, KeyError):
        return response

@params.route('/params', methods=['GET'])
@jwt_required()
def retreive_params():
    ''' Récupération des paramètres de l'intercom
    '''
    current_app.logger.info("Récupération des paramètres de l'intercom")
    current_user = get_jwt_identity()
    # load data from JSON database
    try:
        with open(current_app.config['DB_PATH'], 'r') as f:
            data = json.load(f)
        if 'OPERATION' and 'PIN_ACTIF' and 'CODE_PIN' and 'NUM_AUTORISE' and 'TONE_DURATION' and 'DTMF_CODE' and 'DTMF_DURATION' in data:
            content = {'operation': data['OPERATION'], 'pin_actif': data['PIN_ACTIF'], 'code_pin': data['CODE_PIN'], 'num_autorized': data['NUM_AUTORISE'], 'tone_duration': data['TONE_DURATION'], 'dtmf_code': data['DTMF_CODE'], 'dtmf_duration': data['DTMF_DURATION']}
        else:
            abort(status.HTTP_406_NOT_ACCEPTABLE, description="paramètres manquant en base de données")
    except FileNotFoundError as e:
        current_app.logger.error("Fichier ({}) manquant".format(current_app.config['DB_PATH']))
        abort(status.HTTP_406_NOT_ACCEPTABLE, description="Fichier manquant")

    return content, status.HTTP_200_OK

@params.route('/update_params', methods=['POST'])
@jwt_required()
def update_params():
    ''' Mise à jour des paramètres de l'intercom
    '''
    current_app.logger.info("Mise à jour des paramètres de l'intercom")
    current_user = get_jwt_identity()
    # recuperation des attributs JSON de la requete
    data_req = request.get_json()
    current_app.logger.debug("request: {}".format(data_req))
    # load data from JSON database
    try:
        with open(current_app.config['DB_PATH'], 'r') as f:
            data = json.load(f)
    except FileNotFoundError as e:
        current_app.logger.error("Fichier ({}) manquant".format(current_app.config['DB_PATH']))
        abort(status.HTTP_406_NOT_ACCEPTABLE, description="Fichier manquant")

    if 'operation' in data_req:
        data['OPERATION'] = data_req['operation']
    else:
        abort(status.HTTP_406_NOT_ACCEPTABLE, description="paramètre manquant")
    if 'pin_actif' in data_req:
        data['PIN_ACTIF'] = data_req['pin_actif']
    else:
        abort(status.HTTP_406_NOT_ACCEPTABLE, description="paramètre manquant")
    if 'code_pin' in data_req:
        data['CODE_PIN'] = data_req['code_pin']
    else:
        abort(status.HTTP_406_NOT_ACCEPTABLE, description="paramètre manquant")
    if 'num_autorized' in data_req:
        data['NUM_AUTORISE'] = data_req['num_autorized']
    else:
        abort(status.HTTP_406_NOT_ACCEPTABLE, description="paramètre manquant")
    if 'tone_duration' in data_req:
        data['TONE_DURATION'] = int(data_req['tone_duration'])
    else:
        abort(status.HTTP_406_NOT_ACCEPTABLE, description="paramètre manquant")
    if 'dtmf_code' in data_req:
        data['DTMF_CODE'] = data_req['dtmf_code']
    else:
        abort(status.HTTP_406_NOT_ACCEPTABLE, description="paramètre manquant")
    if 'dtmf_duration' in data_req:
        data['DTMF_DURATION'] = int(data_req['dtmf_duration'])
    else:
        abort(status.HTTP_406_NOT_ACCEPTABLE, description="paramètre manquant")

    with open(current_app.config['DB_PATH'], 'w') as f:
        json.dump(data, f)

    conn = Sock(addr=current_app.config['UNIX_ADDR'], logger=current_app.logger)
    if not conn.connect():
        current_app.logger.error("impossible de se connecter au serveur")
        abort(status.HTTP_406_NOT_ACCEPTABLE, description="Impossible de se connecter au serveur")

    # send order to KineIntercom process
    if not conn.send(b"RELOAD_DB\n"):
        conn.disconnect()
        current_app.logger.error("impossible de communiquer avec le serveur")
        abort(status.HTTP_406_NOT_ACCEPTABLE, description="Impossible de communiquer avec le serveur")

    conn.disconnect()

    content = {'message':'maj parameters successful!'}
    return content, status.HTTP_200_OK