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#       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.

"""core app and WSGI middleware initialization.  New TurboGears2 apps name it application.py"""

import ast
import importlib
import mimetypes
import re
import warnings

from tg import config
from paste.deploy.converters import asbool, aslist, asint
from tg.support.registry import RegistryManager
from beaker.middleware import SessionMiddleware
from paste.exceptions.errormiddleware import ErrorMiddleware
from werkzeug.debug import DebuggedApplication

import activitystream
import ew
import formencode
from ming.odm.middleware import MingMiddleware
from beaker_session_jwt import JWTCookieSession

# Must apply patches before other Allura imports to ensure all the patches are effective.
# This file gets imported from paste/deploy/loadwsgi.py pretty early in the app execution
# ruff: noqa: E402
from allura.lib import patches
patches.apply()
try:
    import newrelic
except ImportError:
    pass
else:
    patches.newrelic()

from allura.config.app_cfg import AlluraJinjaRenderer
from allura.config.app_cfg import ForgeConfig
from allura.lib.custom_middleware import AlluraTimerMiddleware
from allura.lib.custom_middleware import SSLMiddleware
from allura.lib.custom_middleware import StaticFilesMiddleware
from allura.lib.custom_middleware import CSRFMiddleware
from allura.lib.custom_middleware import CORSMiddleware
from allura.lib.custom_middleware import LoginRedirectMiddleware
from allura.lib.custom_middleware import RememberLoginMiddleware
from allura.lib.custom_middleware import SetRequestHostFromConfig
from allura.lib.custom_middleware import MingTaskSessionSetupMiddleware
from allura.lib.custom_middleware import ContentSecurityPolicyMiddleware
from allura.lib.custom_middleware import SetHeadersMiddleware
from allura.lib.custom_middleware import StatusCodeRedirect
from allura.lib import helpers as h
from allura.lib.utils import configure_ming, pkg_file

__all__ = ['make_app']


# this is webapp entry point from setup.py
def make_app(global_conf: dict, **app_conf):
    override_root_module_name = app_conf.get('override_root', None)
    if override_root_module_name:
        # get an actual instance of it, like BasetestProjectRootController or TaskController
        className = override_root_module_name.title().replace('_', '') + 'Controller'
        module = importlib.import_module(f'allura.controllers.{override_root_module_name}')
        rootClass = getattr(module, className)
        root = rootClass()
    else:
        root = None  # will default to RootController in root.py
    return _make_core_app(root, global_conf, **app_conf)


def _make_core_app(root, global_conf: dict, **app_conf):
    """
    Set allura up with the settings found in the PasteDeploy configuration
    file used.

    :param root: The controller module containing the TG root
    :param global_conf: The global settings for allura (those
        defined under the ``[DEFAULT]`` section).
    :type global_conf: dict
    :return: The allura application with all the relevant middleware
        loaded.

    This is the PasteDeploy factory for the allura application.

    ``app_conf`` contains all the application-specific settings (those defined
    under ``[app:main]``.
    """
    # Run all the initialization code here
    mimetypes.init([pkg_file('allura', 'etc/mime.types')] + mimetypes.knownfiles)

    # Configure MongoDB
    configure_ming(global_conf | app_conf)

    # Configure ActivityStream
    if asbool(app_conf.get('activitystream.recording.enabled', False)):
        activitystream.configure(**h.convert_bools(app_conf, prefix='activitystream.'))

    # Configure EW variable provider
    ew.render.TemplateEngine.register_variable_provider(get_tg_vars)

    # Set FormEncode language to english, as we don't support any other locales
    formencode.api.set_stdtranslation(domain='FormEncode', languages=['en'])

    # Create base app
    base_config = ForgeConfig(root)
    app = base_config.make_wsgi_app(global_conf, app_conf, wrap_app=None)

    for mw_ep in h.iter_entry_points('allura.middleware'):
        Middleware = mw_ep.load()
        if getattr(Middleware, 'when', 'inner') == 'inner':
            app = Middleware(app, config)
    # CSP headers
    app = ContentSecurityPolicyMiddleware(app, config)
    # broswer permissions policy
    app = SetHeadersMiddleware(app, config)
    # Required for sessions
    with warnings.catch_warnings():
        # the session_class= arg triggers this warning but is the only way it works, so suppress warning
        warnings.filterwarnings('ignore',
                                re.escape('Session options should start with session. instead of session_.'),
                                DeprecationWarning)
        app = SessionMiddleware(app, config,
                                session_class=JWTCookieSession)
    # Handle "Remember me" functionality
    app = RememberLoginMiddleware(app, config)
    # Redirect 401 to the login page
    app = LoginRedirectMiddleware(app)
    # Add instrumentation
    app = AlluraTimerMiddleware(app, app_conf)
    # Clear cookies when the CSRF field isn't posted
    if not app_conf.get('disable_csrf_protection'):
        app = CSRFMiddleware(app, '_csrf_token')
    if asbool(config.get('cors.enabled', False)):
        # Handle CORS requests
        allowed_methods = aslist(config.get('cors.methods'))
        allowed_headers = aslist(config.get('cors.headers'))
        cache_duration = asint(config.get('cors.cache_duration', 0))
        app = CORSMiddleware(app, allowed_methods, allowed_headers, cache_duration)
    # Setup the allura SOPs
    app = allura_globals_middleware(app)
    # Ensure http and https used per config
    if config.get('override_root') != 'task':
        app = SSLMiddleware(app, app_conf.get('no_redirect.pattern'),
                            app_conf.get('force_ssl.pattern'))
    # Setup resource manager, widget context SOP
    app = ew.WidgetMiddleware(
        app,
        compress=True,
        use_cache=not asbool(global_conf['debug']),
        script_name=app_conf.get('ew.script_name', '/_ew_resources/'),
        url_base=app_conf.get('ew.url_base', '/_ew_resources/'),
        extra_headers=ast.literal_eval(app_conf.get('ew.extra_headers', '[]')),
        cache_max_age=asint(app_conf.get('ew.cache_header_seconds', 60*60*24*365)),

        # settings to pass through to jinja Environment for EW core widgets
        # these are for the easywidgets' own [easy_widgets.engines] entry point
        # (the Allura [easy_widgets.engines] entry point is named "jinja" (not jinja2) but it doesn't need
        #  any settings since it is a class that uses the same jinja env as the rest of allura)
        **{
            'jinja2.auto_reload': asbool(config['auto_reload_templates']),
            'jinja2.bytecode_cache': AlluraJinjaRenderer._setup_bytecode_cache(),
            'jinja2.cache_size': asint(config.get('jinja_cache_size', -1)),
        }
    )
    # Handle static files (by tool)
    app = StaticFilesMiddleware(app, app_conf.get('static.script_name'))
    # Handle setup and flushing of Ming ORM sessions
    app = MingTaskSessionSetupMiddleware(app)
    app = MingMiddleware(app)
    # Set up the registry for stacked object proxies (SOPs).
    app = RegistryManager(app,
                          # streaming=True causes cleanup problems when StatusCodeRedirect does an extra request
                          streaming=False,
                          preserve_exceptions=asbool(config['debug']),  # allow inspecting them when debugging errors
                          )

    # "task" wsgi would get a 2nd request to /error/document if we used this middleware
    if config.get('override_root') not in ('task', 'basetest_project_root'):
        if asbool(config['debug']):
            # Converts exceptions to HTTP errors, shows traceback in debug mode
            app = DebuggedApplication(app, evalex=True)
            app.trusted_hosts += [config['domain']]
        else:
            app = ErrorMiddleware(app, config)

        app = SetRequestHostFromConfig(app, config)

        # Redirect some status codes to /error/document
        handle_status_codes = [403, 404, 410]
        if asbool(config['debug']):
            app = StatusCodeRedirect(app, handle_status_codes)
        else:
            app = StatusCodeRedirect(app, handle_status_codes + [500])

    for mw_ep in h.iter_entry_points('allura.middleware'):
        Middleware = mw_ep.load()
        if getattr(Middleware, 'when', 'inner') == 'outer':
            app = Middleware(app, config)

    return app


def allura_globals_middleware(app):
    def AlluraGlobalsMiddleware(environ, start_response):
        import allura.lib.security
        import allura.lib.app_globals
        registry = environ['paste.registry']
        registry.register(allura.credentials,
                          allura.lib.security.Credentials())
        return app(environ, start_response)
    return AlluraGlobalsMiddleware


def get_tg_vars(context):
    import tg
    from allura.lib import helpers as h
    from urllib.parse import quote, quote_plus
    context.setdefault('g', tg.app_globals)
    context.setdefault('c', tg.tmpl_context)
    context.setdefault('h', h)
    context.setdefault('request', tg.request)
    context.setdefault('response', tg.response)
    context.setdefault('url', tg.url)
    context.setdefault('tg', dict(
        config=tg.config,
        flash_obj=tg.flash,
        quote=quote,
        quote_plus=quote_plus,
        url=tg.url))
