# -*- coding: utf-8 -*-
"""
    rhodecode.controllers.login
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~

    Login controller for rhodeocode

    :created_on: Apr 22, 2010
    :author: marcink
    :copyright: (C) 2010-2012 Marcin Kuzminski <marcin@python-works.com>
    :license: GPLv3, see COPYING for more details.
"""
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import logging
import formencode
import datetime
import urlparse

from formencode import htmlfill
from webob.exc import HTTPFound
from pylons.i18n.translation import _
from pylons.controllers.util import abort, redirect
from pylons import request, response, session, tmpl_context as c, url

import rhodecode.lib.helpers as h
from rhodecode.lib.auth import AuthUser, HasPermissionAnyDecorator
from rhodecode.lib.base import BaseController, render
from rhodecode.lib.exceptions import UserCreationError
from rhodecode.model.db import User
from rhodecode.model.forms import LoginForm, RegisterForm, PasswordResetForm
from rhodecode.model.user import UserModel
from rhodecode.model.meta import Session


log = logging.getLogger(__name__)


class LoginController(BaseController):

    def __before__(self):
        super(LoginController, self).__before__()

    def index(self):
        # redirect if already logged in
        c.came_from = request.GET.get('came_from')
        not_default = self.rhodecode_user.username != 'default'
        ip_allowed = self.rhodecode_user.ip_allowed
        if self.rhodecode_user.is_authenticated and not_default and ip_allowed:
            return redirect(url('home'))

        if request.POST:
            # import Login Form validator class
            login_form = LoginForm()
            try:
                session.invalidate()
                c.form_result = login_form.to_python(dict(request.POST))
                # form checks for username/password, now we're authenticated
                username = c.form_result['username']
                user = User.get_by_username(username, case_insensitive=True)
                auth_user = AuthUser(user.user_id)
                auth_user.set_authenticated()
                cs = auth_user.get_cookie_store()
                session['rhodecode_user'] = cs
                user.update_lastlogin()
                Session().commit()

                # If they want to be remembered, update the cookie
                if c.form_result['remember']:
                    _year = (datetime.datetime.now() +
                             datetime.timedelta(seconds=60 * 60 * 24 * 365))
                    session._set_cookie_expires(_year)

                session.save()

                log.info('user %s is now authenticated and stored in '
                         'session, session attrs %s' % (username, cs))

                # dumps session attrs back to cookie
                session._update_cookie_out()

                # we set new cookie
                headers = None
                if session.request['set_cookie']:
                    # send set-cookie headers back to response to update cookie
                    headers = [('Set-Cookie', session.request['cookie_out'])]

                allowed_schemes = ['http', 'https']
                if c.came_from:
                    parsed = urlparse.urlparse(c.came_from)
                    server_parsed = urlparse.urlparse(url.current())
                    if parsed.scheme and parsed.scheme not in allowed_schemes:
                        log.error(
                            'Suspicious URL scheme detected %s for url %s' %
                            (parsed.scheme, parsed))
                        c.came_from = url('home')
                    elif server_parsed.netloc != parsed.netloc:
                        log.error('Suspicious NETLOC detected %s for url %s'
                                  'server url is: %s' %
                                  (parsed.netloc, parsed, server_parsed))
                        c.came_from = url('home')
                    raise HTTPFound(location=c.came_from, headers=headers)
                else:
                    raise HTTPFound(location=url('home'), headers=headers)

            except formencode.Invalid, errors:
                defaults = errors.value
                # remove password from filling in form again
                del defaults['password']
                return htmlfill.render(
                    render('/login.html'),
                    defaults=errors.value,
                    errors=errors.error_dict or {},
                    prefix_error=False,
                    encoding="UTF-8")
            except UserCreationError, e:
                # container auth or other auth functions that create users on
                # the fly can throw this exception signaling that there's issue
                # with user creation, explanation should be provided in
                # Exception itself
                h.flash(e, 'error')

        return render('/login.html')

    @HasPermissionAnyDecorator('hg.admin', 'hg.register.auto_activate',
                               'hg.register.manual_activate')
    def register(self):
        c.auto_active = 'hg.register.auto_activate' in User.get_default_user()\
            .AuthUser.permissions['global']

        if request.POST:
            register_form = RegisterForm()()
            try:
                form_result = register_form.to_python(dict(request.POST))
                form_result['active'] = c.auto_active
                UserModel().create_registration(form_result)
                h.flash(_('You have successfully registered into RhodeCode'),
                            category='success')
                Session().commit()
                return redirect(url('login_home'))

            except formencode.Invalid, errors:
                return htmlfill.render(
                    render('/register.html'),
                    defaults=errors.value,
                    errors=errors.error_dict or {},
                    prefix_error=False,
                    encoding="UTF-8")
            except UserCreationError, e:
                # container auth or other auth functions that create users on
                # the fly can throw this exception signaling that there's issue
                # with user creation, explanation should be provided in
                # Exception itself
                h.flash(e, 'error')

        return render('/register.html')

    def password_reset(self):
        if request.POST:
            password_reset_form = PasswordResetForm()()
            try:
                form_result = password_reset_form.to_python(dict(request.POST))
                UserModel().reset_password_link(form_result)
                h.flash(_('Your password reset link was sent'),
                            category='success')
                return redirect(url('login_home'))

            except formencode.Invalid, errors:
                return htmlfill.render(
                    render('/password_reset.html'),
                    defaults=errors.value,
                    errors=errors.error_dict or {},
                    prefix_error=False,
                    encoding="UTF-8")

        return render('/password_reset.html')

    def password_reset_confirmation(self):
        if request.GET and request.GET.get('key'):
            try:
                user = User.get_by_api_key(request.GET.get('key'))
                data = dict(email=user.email)
                UserModel().reset_password(data)
                h.flash(_('Your password reset was successful, '
                          'new password has been sent to your email'),
                            category='success')
            except Exception, e:
                log.error(e)
                return redirect(url('reset_password'))

        return redirect(url('login_home'))

    def logout(self):
        session.delete()
        log.info('Logging out and deleting session for user')
        redirect(url('home'))