import datetime
from flask import render_template, redirect, request, url_for, flash
from flask_login import login_user, logout_user, login_required, \
    current_user
from . import auth
from .. import db
from ..models import User, Role, Provider
from ..email import send_email
from .forms import LoginForm, RegistrationForm, PasswordResetRequestForm, \
    PasswordResetForm

@auth.before_app_request
def before_request():
    if current_user.is_authenticated \
            and not current_user.confirmed \
            and request.endpoint[:5] != 'auth.' \
            and '/static/' not in request.path:
        return redirect(url_for('auth.unconfirmed'))
    if current_user.is_authenticated \
            and current_user.suspended \
            and request.endpoint[:5] != 'auth.' \
            and '/static/' not in request.path:
        return redirect(url_for('auth.suspended'))
        
@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')

@auth.route('/suspended')
def suspended():
    if current_user.is_anonymous or not current_user.suspended:
        return redirect(url_for('main.index'))
    return render_template('auth/suspended.html')
    
@auth.route('/login', methods=['GET', 'POST'])
def login():
    form = LoginForm()
    if form.validate_on_submit():
        user = User.query.filter_by(email=form.email.data).first()
        if user is not None and user.verify_password(form.password.data):
            login_user(user, form.remember_me.data)
            return redirect(request.args.get('next') or url_for('main.index'))
        flash('Invalid username or password.')
    return render_template('auth/login.html', form=form)
    
@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():
    form = RegistrationForm()
    if form.validate_on_submit():
        r = Role.query.filter_by(default=True).first()
        user = User(email=form.email.data,
                    username=form.username.data,
                    full_name=form.full_name.data,
                    password=form.password.data,
                    avatar="/static/img/user2-160x160.jpg",
                    created_at=datetime.datetime.now(),
                    role_id=r.id)
        db.session.add(user)
        db.session.commit()
        token = user.generate_confirmation_token()
        send_email(user.email, 'Confirm Your Account',
                   'auth/email/confirm', user=user, token=token)
        flash('A confirmation email has been sent to you by email.')
        return redirect(url_for('main.index'))
    return render_template('auth/register.html', form=form)
    
# user email confirmation function
@auth.route('/confirm/<token>')
@login_required
def confirm(token):
    if current_user.confirmed:
        return redirect(url_for('main.index'))
    if current_user.confirm(token):
        flash('You have confirmed your account. Thanks!')
    else:
        flash('The confirmation link is invalid or has expired.')
    return redirect(url_for('main.index'))

# resend confirmation email
@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', user=current_user, token=token)
    flash('A new confirmation email has been sent to you by email.')
    return redirect(url_for('main.index'))
    
# password reset    
@auth.route('/reset/<token>', methods=['GET', 'POST'])
def password_reset(token):
    if not current_user.is_anonymous:
        return redirect(url_for('main.index'))
    form = PasswordResetForm()
    if form.validate_on_submit():
        user = User.query.filter_by(email=form.email.data).first()
        if user is None:
            return redirect(url_for('main.index'))
        if user.reset_password(token, form.password.data):
            flash('Your password has been updated.')
            return redirect(url_for('auth.login'))
        else:
            return redirect(url_for('main.index'))
    return render_template('auth/reset_password.html', form=form)
    
@auth.route('/reset', methods=['GET', 'POST'])
def password_reset_request():
    if not current_user.is_anonymous:
        return redirect(url_for('main.index'))
    form = PasswordResetRequestForm()
    if form.validate_on_submit():
        user = User.query.filter_by(email=form.email.data).first()
        if user:
            token = user.generate_reset_token()
            send_email(user.email, 'Reset Your Password',
                      'auth/email/reset_password',
                      user=user, token=token,
                      next=request.args.get('next'))
        flash('Instruction to reset your password has been '
               'send to your email address.')
    return render_template('auth/password_reset_request.html', form=form)