#! /usr/bin/env python3.6

"""
server.py
Stripe Sample.
Python 3.6 or newer required.
"""

import stripe
import json
import os
import random
import string

from flask import Flask, render_template, jsonify, request, send_from_directory, session
from flask_babel import Babel, _
from flask_simple_csrf import CSRF


static_dir = str(os.path.abspath(os.path.join(
    __file__, "..", 'assets')))
app = Flask(__name__, static_folder=static_dir,
            static_url_path="", template_folder=static_dir)
app.config.from_pyfile('settings.py')
stripe.api_key = app.config['STRIPE_SECRET_KEY']
CSRF = CSRF(config={
    'SECRET_CSRF_KEY': app.config['SECRET_CSRF_KEY']
})
app = CSRF.init_app(app)
babel = Babel(app)

@app.before_request
def before_request():
    if 'CSRF_TOKEN' not in session or 'USER_CSRF' not in session:
        session['USER_CSRF'] = ''.join(random.SystemRandom().choice(string.ascii_uppercase + string.digits) for _ in range(64))
        session['CSRF_TOKEN'] = CSRF.create(session['USER_CSRF'])

@babel.localeselector
def get_locale():
    return 'fr' #request.accept_languages.best_match(app.config['LANGUAGES'])

@app.route('/', methods=['GET'])
def get_index():
    return render_template('index.html', **app.config['CUSTOM'],
                           csrf=session['USER_CSRF'])


@app.route('/success', methods=['GET'])
def get_success():
    return render_template('success.html', **app.config['CUSTOM'])


@app.route('/canceled', methods=['GET'])
def get_canceled():
    return render_template('canceled.html', **app.config['CUSTOM'])


@app.route('/create-checkout-session', methods=['POST'])
def create_checkout_session():
    data = json.loads(request.data)
    domain_url = app.config['DOMAIN']
    try:
        donation = app.config['DONATION']
        currencies = [iso for iso, symbol in app.config['CUSTOM']['currencies']]
        if CSRF.verify(data['user_csrf'], session['CSRF_TOKEN']) is False or \
           data['frequency'] not in ['recuring', 'one_time'] or \
           data['currency'] not in currencies or \
           int(data['quantity']) <= 0:
            return jsonify(error="Bad value"), 400

        # Create new Checkout Session for the order
        price = donation[data['frequency']][data['currency']]
        mode = "payment" if data['frequency'] == 'one_time' else "subscription"

        checkout_session = stripe.checkout.Session.create(
            success_url=domain_url +
            "/success?session_id={CHECKOUT_SESSION_ID}",
            cancel_url=domain_url + "/canceled",
            payment_method_types= ["card"],
            mode=mode,
            line_items=[
                {
                    "price": price,
                    "quantity": data['quantity']
                }
            ]
        )
        return jsonify({'sessionId': checkout_session['id']})
    except Exception as e:
        return jsonify(error=str(e)), 403



if __name__ == '__main__':
    app.run(port=app.config['PORT'], debug=app.debug)