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#       regarding copyright ownership.  The ASF licenses this file
#       to you under the Apache License, Version 2.0 (the
#       "License"); you may not use this file except in compliance
#       with the License.  You may obtain a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
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#       "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
#       KIND, either express or implied.  See the License for the
#       specific language governing permissions and limitations
#       under the License.

# -*- python -*-
import logging
import json

# Non-stdlib imports
from tg import expose, jsonify, redirect
from tg import tmpl_context as c
from tg import app_globals as g
from tg import request
from formencode import validators as fev

# Pyforge-specific imports
from allura.app import Application, ConfigOption, SitemapEntry, DefaultAdminController
from allura.lib import helpers as h
from allura.lib.decorators import require_post
from allura.lib.security import require_access
from allura import model as M
from allura.controllers import BaseController
from allura.controllers.rest import AppRestControllerMixin

# Local imports
from forgelink import version

log = logging.getLogger(__name__)


class ForgeLinkApp(Application):

    '''This is the Link app for PyForge'''
    __version__ = version.__version__
    tool_description = """
        A link to a URL of your choice, either on this site or somewhere else.
        It will appear in your project menu alongside the other project tools.
    """
    permissions = ['configure', 'read']
    permissions_desc = {
        'read': 'View link.',
    }
    config_options = Application.config_options + [
        ConfigOption(
            'url', str, None,
            label='External Url',
            help_text='URL to which you wish to link',
            validator=fev.URL(not_empty=True, add_http=True),
            extra_attrs={'type': 'url', 'required' : '', 'placeholder' : 'https://example.com'}),
    ]
    config_on_install = ['url']
    searchable = True
    exportable = True
    has_notifications = False
    tool_label = 'External Link'
    default_mount_label = 'Link name'
    default_mount_point = 'link'
    ordinal = 1
    icons = {
        24: 'images/ext_24.png',
        32: 'images/ext_32.png',
        48: 'images/ext_48.png'
    }

    def __init__(self, project, config):
        Application.__init__(self, project, config)
        self.root = RootController()
        self.api_root = RootRestController(self)
        self.admin = AdminController(self)

    @property
    @h.exceptionless([], log)
    def sitemap(self):
        menu_id = self.config.options.mount_label
        return [SitemapEntry(menu_id, self.config.options.get('url') or '.')]

    def sidebar_menu(self):
        return []

    def admin_menu(self):
        return super().admin_menu()

    def install(self, project):
        'Set up any default permissions and roles here'
        self.config.options['project_name'] = project.name
        super().install(project)
        # Setup permissions
        role_admin = M.ProjectRole.by_name('Admin')._id
        role_anon = M.ProjectRole.anonymous()._id
        self.config.acl = [
            M.ACE.allow(role_anon, 'read'),
            M.ACE.allow(role_admin, 'configure'),
        ]

    def uninstall(self, project):
        "Remove all the tool's artifacts from the database"
        super().uninstall(project)

    def bulk_export(self, f, export_path='', with_attachments=False):
        json.dump(RootRestController(self).link_json(),
                  f, cls=jsonify.JSONEncoder, indent=2)


class RootController(BaseController):

    def _check_security(self):
        require_access(c.app, 'read')

    @expose('jinja:forgelink:templates/link/index.html')
    def index(self, **kw):
        url = c.app.config.options.get('url')
        if url:
            redirect(url)
        return dict()

    @expose()
    def _lookup(self, *remainder):
        path = "/".join(remainder)
        url = c.app.config.options.get('url')
        if url:
            # h.urlquote is better than utf8 encoding for Location headers, but in this case the url can be a full
            # http://... url and we don't want to urlquote/urlencode that part
            redirect(url + h.really_unicode(path))
        return dict()


class RootRestController(BaseController, AppRestControllerMixin):

    def __init__(self, app):
        self.app = app

    def _check_security(self):
        require_access(self.app, 'read')

    def link_json(self):
        return dict(url=self.app.config.options.get('url'))

    @expose('json:')
    def index(self, url='', **kw):
        if (request.method == 'POST') and (url != ''):
            require_access(self.app, 'configure')
            self.app.config.options.url = url
        return self.link_json()


class AdminController(DefaultAdminController):

    @expose()
    @require_post()
    def configure(self, *args, **kwargs):
        try:
            return super().configure(*args, **kwargs)
        finally:
            # since sitemap() uses the link URL which was changed
            g.post_event('project_menu_updated')