import functools

from flask import (
    Blueprint, flash, g, redirect, render_template, request, session, url_for
)
from werkzeug.security import check_password_hash, generate_password_hash

from certweb.db import get_db

from flask_debugtoolbar import DebugToolbarExtension
import logging

bp = Blueprint('auth', __name__, url_prefix='/auth')

@bp.route('/register', methods=('GET', 'POST'))
def register():
    if request.method == 'POST':
        username = request.form['username']
        password = request.form['password']
        fullname = request.form['fullname']
        email = request.form['email']
        db = get_db()
        error = None

        if not username:
            error = 'Username is required.'
        elif not password:
            error = 'Password is required.'
        elif not fullname:
            error = 'Fullname is required.'
        elif not email:
            error = 'Email is required.'
        elif db.execute(
            'SELECT id FROM user WHERE username = ?', (username,)
        ).fetchone() is not None:
            error = 'User {} is already registered.'.format(username)

        if error is None:
            db.execute(
                'INSERT INTO user (username, password, fullname, email) VALUES (?, ?, ?, ?)',
                (username, generate_password_hash(password), fullname, email)
            )
            db.commit()
            return redirect(url_for('auth.login'))

        flash(error)

    return render_template('auth/register.html')

@bp.route('/<int:id>/update', methods=('GET', 'POST'))
def update(id):
    user = get_user(id)

    if request.method == 'POST':
        username = request.form['username']
        fullname = request.form['fullname']
        password = request.form['password']
        email = request.form['email']
        error = None

        if not username:
            error = 'Username is required.'
        elif not password:
            error = 'Password is required.'
        elif not fullname:
            error = 'Fullname is required.'
        elif not email:
            error = 'Email is required.'

        if error is not None:
            flash(error)
        else:
            db = get_db()
            db.execute(
                'UPDATE user SET username = ?, password = ?, fullname = ?, email = ?'
                ' WHERE id = ?',
                (username, generate_password_hash(password), fullname, email, id)
            )
            db.commit()
            return redirect(url_for('pubkeys.index'))


    return render_template('auth/update.html', user=user)

@bp.route('/login', methods=('GET', 'POST'))
def login():
    if request.method == 'POST':
        username = request.form['username']
        password = request.form['password']
        db = get_db()
        error = None
        user = db.execute(
            'SELECT * FROM user WHERE username = ?', (username,)
        ).fetchone()

        if user is None:
            error = 'Incorrect username.'
        elif not check_password_hash(user['password'], password):
            error = 'Incorrect password.'

        if error is None:
            session.clear()
            session['user_id'] = user['id']
            return redirect(url_for('pubkeys.index'))

        flash(error)

    return render_template('auth/login.html')

@bp.before_app_request
def load_logged_in_user():
    user_id = session.get('user_id')

    if user_id is None:
        g.user = None
    else:
        g.user = get_db().execute(
            'SELECT * FROM user WHERE id = ?', (user_id,)
        ).fetchone()

@bp.route('/logout')
def logout():
    session.clear()
    return redirect(url_for('pubkeys.index'))

def login_required(view):
    @functools.wraps(view)
    def wrapped_view(**kwargs):
        if g.user is None:
            return redirect(url_for('auth.login'))

        return view(**kwargs)

    return wrapped_view


def get_user(id):
    user = get_db().execute(
        'SELECT * FROM user WHERE id = ?', (id,)
    ).fetchone()

    if user is None:
        abort(404, "User id {0} does not exist.".format(id))

    return user