from app import db
from app.email import send_email
from app.models import User
from flask import (current_app, flash, redirect, render_template, request,
                   url_for)
from flask_login import current_user, login_required, logout_user
from . import auth
from .forms import (PasswordResetForm, PasswordResetRequestForm,
                    RegistrationForm)
import os


@auth.route('/logout')
@login_required
def logout():
    logout_user()
    flash('You have been logged out.')
    return redirect(url_for('main.index'))


@auth.route('/register', methods=['GET', 'POST'])
def register():
    if not current_user.is_anonymous:
        return redirect(url_for('main.dashboard'))
    registration_form = RegistrationForm(prefix='registration-form')
    if registration_form.validate_on_submit():
        user = User(email=registration_form.email.data.lower(),
                    password=registration_form.password.data,
                    username=registration_form.username.data)
        db.session.add(user)
        db.session.commit()
        dir = os.path.join(current_app.config['NOPAQUE_STORAGE'], str(user.id))
        try:
            os.makedirs(dir)
        except OSError:
            flash('[ERROR]!')
            user.delete()
        else:
            token = user.generate_confirmation_token()
            send_email(user.email, 'Confirm Your Account',
                       'auth/email/confirm', token=token, user=user)
            flash('A confirmation email has been sent to you by email.')
            return redirect(url_for('main.index'))
    return render_template('auth/register.html.j2',
                           registration_form=registration_form,
                           title='Register')


@auth.route('/confirm/<token>')
@login_required
def confirm(token):
    if current_user.confirmed:
        return redirect(url_for('main.index'))
    if current_user.confirm(token):
        db.session.commit()
        flash('You have confirmed your account. Thanks!')
    else:
        flash('The confirmation link is invalid or has expired.')
    return redirect(url_for('main.dashboard'))


@auth.before_app_request
def before_request():
    """
    Checks if a user is unconfirmed when visiting specific sites. Redirects to
    unconfirmed view if user is unconfirmed.
    """
    if (current_user.is_authenticated
            and not current_user.confirmed
            and request.blueprint != 'auth'
            and request.endpoint != 'static'):
        return redirect(url_for('auth.unconfirmed'))


@auth.route('/unconfirmed')
def unconfirmed():
    if current_user.is_anonymous or current_user.confirmed:
        return redirect(url_for('main.index'))
    return render_template('auth/unconfirmed.html.j2', title='Unconfirmed')


@auth.route('/confirm')
@login_required
def resend_confirmation():
    token = current_user.generate_confirmation_token()
    send_email(current_user.email,
               'Confirm Your Account',
               'auth/email/confirm',
               token=token,
               user=current_user)
    flash('A new confirmation email has benn sent to you by email.')
    return redirect(url_for('main.dashboard'))


@auth.route('/reset', methods=['GET', 'POST'])
def password_reset_request():
    if not current_user.is_anonymous:
        return redirect(url_for('main.dashboard'))
    form = PasswordResetRequestForm()
    if form.validate_on_submit():
        user = User.query.filter_by(email=form.email.data.lower()).first()
        if user:
            token = user.generate_reset_token()
            send_email(user.email,
                       'Reset Your Password',
                       'auth/email/reset_password',
                       token=token,
                       user=user)
        flash('An email with instructions to reset your password has been '
              'sent to you.')
        return redirect(url_for('main.index'))
    return render_template('auth/reset_password_request.html.j2',
                           form=form,
                           title='Password Reset')


@auth.route('/reset/<token>', methods=['GET', 'POST'])
def password_reset(token):
    if not current_user.is_anonymous:
        return redirect(url_for('main.dashboard'))
    form = PasswordResetForm()
    if form.validate_on_submit():
        if User.reset_password(token, form.password.data):
            db.session.commit()
            flash('Your password has been updated.')
            return redirect(url_for('main.index'))
        else:
            return redirect(url_for('main.index'))
    return render_template('auth/reset_password.html.j2',
                           form=form,
                           title='Password Reset')