from flask import render_template, request, flash, redirect, url_for
from app import app, db
from app.forms import LoginForm, RegistrationForm
from flask_login import current_user, login_user, logout_user, login_required
from app.models import User
from werkzeug.urls import url_parse
from werkzeug.utils import secure_filename
import os, sys

@app.route('/')
@app.route('/index')
@login_required
def index():
    return render_template("index.html", title='Home Page')

@app.route('/login', methods=['GET', 'POST'])
def login():
    if current_user.is_authenticated:
        return redirect(url_for('index'))
    form = LoginForm()
    if form.validate_on_submit():
        user = User.query.filter_by(username=form.username.data).first()
        if user is None or not user.check_password(form.password.data):
            flash('Invalid username or password')
            return redirect(url_for('login'))
        login_user(user, remember=form.remember_me.data)
        next_page = request.args.get('next')
        if not next_page or url_parse(next_page).netloc != '':
            next_page = url_for('index')
        return redirect(next_page)
    return render_template('login.html', title='Sign In', form=form)

@app.route('/logout')
def logout():
    logout_user()
    return redirect(url_for('index'))

@app.route('/register', methods=['GET', 'POST'])
def register():
    if current_user.is_authenticated:
        return redirect(url_for('index'))
    form = RegistrationForm()
    if form.validate_on_submit():
        user = User(username=form.username.data, email=form.email.data)
        user.set_password(form.password.data)
        db.session.add(user)
        db.session.commit()
        flash('Congratulations, you are now a registered user!')
        return redirect(url_for('login'))
    return render_template('register.html', title='Register', form=form)

def allowed_file(filename):
	return '.' in filename and \
		   filename.rsplit('.', 1)[1] in app.config['ALLOWED_EXTENSIONS']

@app.route('/upload', methods=['POST'])
def upload():
	if request.method == 'POST':
		f_list = request.files.getlist('files')
		directory = os.path.join(app.root_path, app.config['UPLOAD_FOLDER'])
		if not os.path.exists(directory):
			os.makedirs(directory)
		for f in f_list:
			if f and '.' in f.filename and f.filename.rsplit('.', 1)[1] in app.config['ALLOWED_EXTENSIONS']:
				filename = secure_filename(f.filename)
				path = os.path.join(app.root_path, app.config['UPLOAD_FOLDER'], filename)
				f.save(path)
		flash('File(s) successfully uploaded')
		return redirect(url_for('index'))
	return render_template_string("only support POST")
