from flask import Flask, render_template, request, flash
from wtforms import Form, StringField
from wtforms.validators import DataRequired, URL
import secrets

DEBUG = False
app = Flask(__name__)
app.config['SECRET_KEY'] = secrets.token_urlsafe(20)

class MyForm(Form):
    url = StringField('url', validators=[DataRequired(), URL(message='Must be a valid URL')])

    @app.route('/', methods=['GET', 'POST'])
    def hello():
        # TODO: error handling?
        form = MyForm(request.form)
        # print(form.errors)

        if request.method == 'POST':
            url = request.form['url']
            print("URL: " + url)

            if form.validate():
                flash('OK. Download in progress')
            else:
                flash('Error: bad URL')

        return render_template('index.html', form=form)


if __name__ == "__main__":
    app.run()