from flask import render_template, flash, redirect, session, url_for, request, g
from flask_login import login_user, logout_user, current_user, login_required
from app import app, db, lm
from .forms import LoginForm, RegisterForm
from .models import User
from werkzeug.security import generate_password_hash, check_password_hash
from sqlalchemy import exc

class DBException(Exception):
    pass

@app.before_request
def before_request():
    g.user = current_user

@lm.user_loader
def load_user(id):
    return User.query.get(int(id))

@app.route('/')
@app.route('/index')
def index():
    user = g.user
    return render_template('index.html',
                           title='Home',
                           user=user)

@app.route('/login', methods=['GET', 'POST'])
def login():
    if g.user is not None and g.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:
            flash('Username or password is wrong. Please try again.')
        else:
            if check_password_hash(user.password, form.password.data):
                app.logger.info("Login: %s" % user)
                remember_me = form.remember_me.data
                if 'remember_me' in session:
                    session.pop('remember_me',  None)
                login_user(user,  remember = remember_me)
                return redirect(request.args.get('next') or url_for('index'))
            else:
                flash('Username or password is wrong. Please try again')
    return render_template('login.html', 
                           title='Sign In',
                           form=form)

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

@app.route('/user/<username>')
@login_required
def user(username):
    user = User.query.filter_by(username=username).first()
    if user is None:
        flash('User %s not found.' % username)
        return redirect(url_for('index'))
    app.logger.info("Show profile: %s" % user)
    return render_template('user.html',
                            title='Profile', 
                           user=user)

@app.route('/register', methods=['GET', 'POST'])
def register():
    form = RegisterForm()
    if form.validate_on_submit():
        if form.password.data == form.passwordchk.data:
            try:
                username=form.username.data
                email=form.email.data
                u = User.query.filter_by(username=username).first()
                if u:
                    raise DBException("%s: Username exist" % username)
                e = User.query.filter_by(email=email).first()
                if e:
                    raise DBException("%s: Email exist" % email)
                hashed_password = generate_password_hash(form.password.data, method='sha256')
                new_user = User(name=form.name.data, username=form.username.data, email=form.email.data, password=hashed_password)
            except DBException as ex:
                db.session.rollback()
                flash(ex)
            except exc.IntegrityError as ex:
                db.session.rollback()
                flash('Create user failed: %s' % ex)
            except:
                db.session.rollback()
                flash('Unknown error')
            else:
                db.session.add(new_user)
                db.session.commit()
                app.logger.warning("Registered: %s" % new_user)
                flash('You have been registered with username "%s"' % form.username.data)
                return redirect(url_for('login'))
        else:
            flash('Password did not match password check')
    return render_template('register.html',
                           title='Register',
                           form=form)

@app.route('/resetpwd')
def resetpwd():
    return '<h1>resetpwd</h1>'

@app.route('/search')
def search():
    return '<h1>search</h1>'

@app.route('/admin')
#@login_required
def admin():
    try:
        if g.user is not None and g.user.is_admin:
            app.logger.warning("Enter Admin area: %s" % g.user)
            return '<h1>Admin</h1>'
    except AttributeError:
        pass
    app.logger.critical("Tried to enter Admin area: %s" % g.user)
    return redirect(url_for('index'))