# -*- coding: utf-8 -*-


from copy import deepcopy
from flask import Blueprint
from flask import current_app, redirect, render_template, request, g, \
     flash, url_for
from flask.ext.login import login_required, login_user, logout_user, current_user
from werkzeug.exceptions import Forbidden

from accounts.forms import RegisterForm, RegisterCompleteForm, \
    LostPasswordForm, SettingsForm
from accounts.utils import templated
from accounts.utils.confirmation import Confirmation
from accounts.utils.login import logout_required
from accounts.models import Account


bp = Blueprint('default', __name__)


@bp.route('/register', methods=['GET', 'POST'])
@templated('register.html')
@logout_required
def register():
    form = RegisterForm()
    if form.validate_on_submit():
        current_app.mail_backend.send(form.mail.data, 'mail/register.txt',
                                      username=form.username.data)

        flash('Es wurde eine E-Mail an die angegebene Adresse geschickt, '
              'um diese zu überprüfen. Bitte folge den Anweisungen in der '
              'E-Mail.', 'success')

        return redirect(url_for('.index'))

    return {'form': form}


@bp.route('/register/<token>', methods=['GET', 'POST'])
@templated('register_complete.html')
@logout_required
def register_complete(token):
    #TODO: check for double uids and mail
    username, mail = Confirmation('register').loads_http(token, max_age=3*24*60*60)

    try:
        current_app.user_backend.get_by_uid(username)
        current_app.user_backend.get_by_mail(mail)
    except current_app.user_backend.NoSuchUserError:
        pass
    else:
        flash('Du hast den Benutzer bereits angelegt! Du kannst dich jetzt einfach einloggen:')
        return redirect(url_for('.index'))

    form = RegisterCompleteForm()
    if form.validate_on_submit():
        user = Account(username, mail, password=form.password.data)
        current_app.user_backend.register(user)
        login_user(user)

        current_app.mail_backend.send(
            current_app.config['MAIL_REGISTER_NOTIFY'],
            'mail/register_notify.txt',
            username=username, mail=mail)

        flash('Benutzer erfolgreich angelegt.', 'success')
        return redirect(url_for('.index'))

    return {
        'form': form,
        'token': token,
        'username': username,
        'mail': mail,
    }


@bp.route('/lost_password', methods=['GET', 'POST'])
@templated('lost_password.html')
@logout_required
def lost_password():
    form = LostPasswordForm()
    if form.validate_on_submit():
        #TODO: make the link only usable once (e.g include a hash of the old pw)
        # atm the only thing we do is make the link valid for only little time
        current_app.mail_backend.send(
            form.user.mail, 'mail/lost_password.txt', username=form.user.uid)

        flash('Wir haben dir eine E-Mail mit einem Link zum Passwort ändern '
              'geschickt. Bitte folge den Anweisungen in der E-Mail.', 'success')

        return redirect(url_for('.index'))

    return {'form': form}


@bp.route('/lost_password/<token>', methods=['GET', 'POST'])
@templated('lost_password_complete.html')
@logout_required
def lost_password_complete(token):
    (username,) = Confirmation('lost_password').loads_http(token, max_age=4*60*60)

    form = RegisterCompleteForm()
    if form.validate_on_submit():
        user = current_app.user_backend.get_by_uid(username)
        user.change_password(form.password.data)
        current_app.user_backend.update(user, as_admin=True)
        login_user(user)

        flash('Passwort geändert.', 'success')
        return redirect(url_for('.index'))

    return {
        'form': form,
        'token': token,
        'username': username,
    }


@bp.route('/', methods=['GET', 'POST'])
@templated('index.html')
@login_required
def index():
    form = SettingsForm(mail=current_user.mail)
    if form.validate_on_submit():
        changed = False

        if request.form.get('submit_services'):
            for service in current_app.all_services:
                field = form.get_servicedelete(service.id)
                if field.data:
                    current_user.reset_password(service.id)
                    changed = True

        elif request.form.get('submit_main'):
            if form.mail.data and form.mail.data != current_user.mail:
                current_app.mail_backend.send(
                    form.mail.data, 'mail/change_mail.txt',
                    username=current_user.uid)

                flash('Es wurde eine E-Mail an die angegebene Adresse geschickt, '
                      'um diese zu überprüfen. Bitte folge den Anweisungen in der '
                      'E-Mail.', 'success')
                changed = True

            if form.password.data:
                current_user.change_password(form.password.data, form.old_password.data)
                flash('Passwort geändert', 'success')
                changed = True

            for service in current_app.all_services:
                field = form.get_servicepassword(service.id)
                if field.data:
                    changed = True
                    current_user.change_password(field.data, None, service.id)

        if changed:
            current_app.user_backend.update(current_user)
            login_user(current_user)
            return redirect(url_for('.index'))
        else:
            flash('Nichts geändert.')


    services = deepcopy(current_app.all_services)
    for s in services:
        s.changed = s.id in current_user.services

    return {
        'form': form,
        'services': services,
    }


@bp.route('/change_mail/<token>')
@login_required
def change_mail(token):
    username, mail = Confirmation('change_mail').loads_http(token, max_age=3*24*60*60)

    if current_user.uid != username:
        raise Forbidden('Bitte logge dich als der Benutzer ein, dessen E-Mail-Adresse du ändern willst.')

    results = current_app.user_backend.find_by_mail(mail)
    for user in results:
        if user.uid != current_user.uid:
            raise Forbidden('Diese E-Mail-Adresse wird schon von einem anderen account benutzt!')

    current_user.change_email(mail)
    current_app.user_backend.update(current_user)

    flash('E-Mail-Adresse geändert.', 'success')
    return redirect(url_for('.index'))


@bp.route('/about')
@templated('about.html')
def about():
    return {
        'app': current_app,
    }


@bp.app_errorhandler(403)
@bp.app_errorhandler(404)
@bp.app_errorhandler(Exception)
def errorhandler(e):
    try:
        code = e.code
    except AttributeError:
        code = 500

    return render_template('error.html', error=e), code