# Part of Odoo. See LICENSE file for full copyright and licensing details.
#----------------------------------------------------------
# ir_http modular http routing
#----------------------------------------------------------
import hashlib
import json
import logging
import os
import re
import threading
import unicodedata

import werkzeug
import werkzeug.exceptions
import werkzeug.routing
import werkzeug.utils

try:
    from werkzeug.routing import NumberConverter
except ImportError:
    from werkzeug.routing.converters import NumberConverter  # moved in werkzeug 2.2.2

# optional python-slugify import (https://github.com/un33k/python-slugify)
try:
    import slugify as slugify_lib
except ImportError:
    slugify_lib = None

import odoo
from odoo import api, http, models, tools, SUPERUSER_ID
from odoo.exceptions import AccessDenied
from odoo.http import request, Response, ROUTING_KEYS
from odoo.modules.registry import Registry
from odoo.service import security
from odoo.tools.json import json_default
from odoo.tools.misc import get_lang, submap
from odoo.tools.translate import code_translations

_logger = logging.getLogger(__name__)

# see also mimetypes module: https://docs.python.org/3/library/mimetypes.html and odoo.tools.mimetypes
EXTENSION_TO_WEB_MIMETYPES = {
    '.css': 'text/css',
    '.less': 'text/less',
    '.scss': 'text/scss',
    '.js': 'text/javascript',
    '.xml': 'text/xml',
    '.csv': 'text/csv',
    '.html': 'text/html',
}


class RequestUID(object):
    def __init__(self, **kw):
        self.__dict__.update(kw)


class ModelConverter(werkzeug.routing.BaseConverter):
    regex = r'[0-9]+'

    def __init__(self, url_map, model=False):
        super().__init__(url_map)
        self.model = model

        IrHttp = Registry(threading.current_thread().dbname)['ir.http']
        self.slug = IrHttp._slug
        self.unslug = IrHttp._unslug

    def to_python(self, value: str) -> models.BaseModel:
        _uid = RequestUID(value=value, converter=self)
        env = api.Environment(request.cr, _uid, request.context)
        return env[self.model].browse(self.unslug(value)[1])

    def to_url(self, value: models.BaseModel) -> str:
        return self.slug(value)


class ModelsConverter(werkzeug.routing.BaseConverter):
    regex = r'[0-9,]+'

    def __init__(self, url_map, model=False):
        super().__init__(url_map)
        self.model = model

    def to_python(self, value: str) -> models.BaseModel:
        _uid = RequestUID(value=value, converter=self)
        env = api.Environment(request.cr, _uid, request.context)
        return env[self.model].browse(int(v) for v in value.split(','))

    def to_url(self, value: models.BaseModel) -> str:
        return ",".join(value.ids)


class SignedIntConverter(NumberConverter):
    regex = r'-?\d+'
    num_convert = int


class LazyCompiledBuilder:
    def __init__(self, rule, _compile_builder, append_unknown):
        self.rule = rule
        self._callable = None
        self._compile_builder = _compile_builder
        self._append_unknown = append_unknown

    def __get__(self, *args):
        # Rule.compile will actually call
        #
        #   self._build = self._compile_builder(False).__get__(self, None)
        #   self._build_unknown = self._compile_builder(True).__get__(self, None)
        #
        # meaning the _build and _build unkown will contain _compile_builder().__get__(self, None).
        # This is why this override of __get__ is needed.
        return self

    def __call__(self, *args, **kwargs):
        if self._callable is None:
            self._callable = self._compile_builder(self._append_unknown).__get__(self.rule, None)
            del self.rule
            del self._compile_builder
            del self._append_unknown
        return self._callable(*args, **kwargs)


class FasterRule(werkzeug.routing.Rule):
    """
    _compile_builder is a major part of the routing map generation and rules
    are actually not build so often.
    This classe makes calls to _compile_builder lazy
    """
    def _compile_builder(self, append_unknown=True):
        return LazyCompiledBuilder(self, super()._compile_builder, append_unknown)


class IrHttp(models.AbstractModel):
    _name = 'ir.http'
    _description = "HTTP Routing"

    @classmethod
    def _slugify_one(cls, value: str, max_length: int = 0) -> str:
        """ Transform a string to a slug that can be used in a url path.
            This method will first try to do the job with python-slugify if present.
            Otherwise it will process string by stripping leading and ending spaces,
            converting unicode chars to ascii, lowering all chars and replacing spaces
            and underscore with hyphen "-".
        """
        if slugify_lib:
            # There are 2 different libraries only python-slugify is supported
            try:
                return slugify_lib.slugify(value, max_length=max_length)
            except TypeError:
                pass
        uni = unicodedata.normalize('NFKD', value).encode('ascii', 'ignore').decode('ascii')
        slug_str = re.sub(r'[\W_]+', '-', uni).strip('-').lower()
        return slug_str[:max_length] if max_length > 0 else slug_str

    @classmethod
    def _slugify(cls, value: str, max_length: int = 0, path: bool = False) -> str:
        if not path:
            return cls._slugify_one(value, max_length=max_length)
        else:
            res = []
            for u in value.split('/'):
                s = cls._slugify_one(u, max_length=max_length)
                if s:
                    res.append(s)
            # check if supported extension
            path_no_ext, ext = os.path.splitext(value)
            if ext in EXTENSION_TO_WEB_MIMETYPES:
                res[-1] = cls._slugify_one(path_no_ext) + ext
            return '/'.join(res)

    @classmethod
    def _slug(cls, value: models.BaseModel | tuple[int, str]) -> str:
        if isinstance(value, tuple):
            return str(value[0])
        return str(value.id)

    @classmethod
    def _unslug(cls, value: str) -> tuple[str | None, int] | tuple[None, None]:
        try:
            return None, int(value)
        except ValueError:
            return None, None

    #------------------------------------------------------
    # Routing map
    #------------------------------------------------------

    @classmethod
    def _get_converters(cls) -> dict[str, type]:
        return {'model': ModelConverter, 'models': ModelsConverter, 'int': SignedIntConverter}

    @classmethod
    def _match(cls, path_info):
        rule, args = request.env['ir.http'].routing_map().bind_to_environ(request.httprequest.environ).match(path_info=path_info, return_rule=True)
        return rule, args

    @classmethod
    def _get_public_users(cls):
        return [request.env['ir.model.data']._xmlid_to_res_model_res_id('base.public_user')[1]]

    @classmethod
    def _auth_method_bearer(cls):
        headers = request.httprequest.headers

        def get_http_authorization_bearer_token():
            # werkzeug<2.3 doesn't expose `authorization.token` (for bearer authentication)
            # check header directly
            header = headers.get("Authorization")
            if header and (m := re.match(r"^bearer\s+(.+)$", header, re.IGNORECASE)):
                return m.group(1)
            return None

        def check_sec_headers():
            """Protection against CSRF attacks.
            Modern browsers automatically add Sec- headers that we can check to protect against CSRF.
            https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Sec-Fetch-User
            """
            return (
                headers.get("Sec-Fetch-Dest") == "document"
                and headers.get("Sec-Fetch-Mode") == "navigate"
                and headers.get("Sec-Fetch-Site") in ('none', 'same-origin')
                and headers.get("Sec-Fetch-User") == "?1"
            )

        if token := get_http_authorization_bearer_token():
            # 'rpc' scope does not really exist, we basically require a global key (scope NULL)
            uid = request.env['res.users.apikeys']._check_credentials(scope='rpc', key=token)
            if not uid:
                raise werkzeug.exceptions.Unauthorized(
                    "Invalid apikey",
                    www_authenticate=werkzeug.datastructures.WWWAuthenticate('bearer'))
            if request.env.uid and request.env.uid != uid:
                raise AccessDenied("Session user does not match the used apikey")
            request.update_env(user=uid)
        elif not request.env.uid:
            raise werkzeug.exceptions.Unauthorized(
                'User not authenticated, use the "Authorization" header',
                www_authenticate=werkzeug.datastructures.WWWAuthenticate('bearer'))
        elif not check_sec_headers():
            raise AccessDenied("Missing \"Authorization\" or Sec-headers for interactive usage")
        cls._auth_method_user()

    @classmethod
    def _auth_method_user(cls):
        if request.env.uid in [None] + cls._get_public_users():
            raise http.SessionExpiredException("Session expired")

    @classmethod
    def _auth_method_none(cls):
        request.env = api.Environment(request.env.cr, None, request.env.context)

    @classmethod
    def _auth_method_public(cls):
        if request.env.uid is None:
            public_user = request.env.ref('base.public_user')
            request.update_env(user=public_user.id)

    @classmethod
    def _authenticate(cls, endpoint):
        auth = 'none' if http.is_cors_preflight(request, endpoint) else endpoint.routing['auth']
        cls._authenticate_explicit(auth)

    @classmethod
    def _authenticate_explicit(cls, auth):
        try:
            if request.session.uid is not None:
                if not security.check_session(request.session, request.env, request):
                    request.session.logout(keep_db=True)
                    request.env = api.Environment(request.env.cr, None, request.session.context)
            getattr(cls, f'_auth_method_{auth}')()
        except (AccessDenied, http.SessionExpiredException, werkzeug.exceptions.HTTPException):
            raise
        except Exception:
            _logger.info("Exception during request Authentication.", exc_info=True)
            raise AccessDenied()

    @classmethod
    def _geoip_resolve(cls):
        return request._geoip_resolve()

    @classmethod
    def _sanitize_cookies(cls, cookies):
        pass

    @classmethod
    def _pre_dispatch(cls, rule, args):
        ICP = request.env['ir.config_parameter'].with_user(SUPERUSER_ID)

        # Change the default database-wide 128MiB upload limit on the
        # ICP value. Do it before calling http's generic pre_dispatch
        # so that the per-route limit @route(..., max_content_length=x)
        # takes over.
        try:
            key = 'web.max_file_upload_size'
            if (value := ICP.get_param(key, None)) is not None:
                request.httprequest.max_content_length = int(value)
        except ValueError:  # better not crash on ALL requests
            _logger.error("invalid %s: %r, using %s instead",
                key, value, request.httprequest.max_content_length,
            )

        request.dispatcher.pre_dispatch(rule, args)

        # verify the default language set in the context is valid,
        # otherwise fallback on the company lang, english or the first
        # lang installed
        env = request.env if request.env.uid else request.env['base'].with_user(SUPERUSER_ID).env
        request.update_context(lang=get_lang(env).code)

        for key, val in list(args.items()):
            if not isinstance(val, models.BaseModel):
                continue

            # Replace uid and lang placeholder by the current request.env.uid and request.env.lang
            args[key] = val.with_env(request.env)

            try:
                # explicitly crash now, instead of crashing later
                args[key].check_access('read')
            except (odoo.exceptions.AccessError, odoo.exceptions.MissingError) as e:
                # custom behavior in case a record is not accessible / has been removed
                if handle_error := rule.endpoint.routing.get('handle_params_access_error'):
                    if response := handle_error(e):
                        werkzeug.exceptions.abort(response)
                if isinstance(e, odoo.exceptions.MissingError):
                    raise werkzeug.exceptions.NotFound() from e
                raise

    @classmethod
    def _dispatch(cls, endpoint):
        result = endpoint(**request.params)
        if isinstance(result, Response) and result.is_qweb:
            result.flatten()
        return result

    @classmethod
    def _post_dispatch(cls, response):
        request.dispatcher.post_dispatch(response)

    @classmethod
    def _post_logout(cls):
        pass

    @classmethod
    def _handle_error(cls, exception):
        return request.dispatcher.handle_error(exception)

    @classmethod
    def _serve_fallback(cls):
        model = request.env['ir.attachment']
        attach = model.sudo()._get_serve_attachment(request.httprequest.path)
        if attach and (attach.store_fname or attach.db_datas):
            return attach._to_http_stream().get_response()

    @classmethod
    def _redirect(cls, location, code=303):
        return werkzeug.utils.redirect(location, code=code, Response=Response)

    def _generate_routing_rules(self, modules, converters):
        return http._generate_routing_rules(modules, False, converters)

    @tools.ormcache('key', cache='routing')
    def routing_map(self, key=None):
        _logger.info("Generating routing map for key %s", str(key))
        registry = Registry(threading.current_thread().dbname)
        installed = registry._init_modules.union(odoo.conf.server_wide_modules)
        mods = sorted(installed)
        # Note : when routing map is generated, we put it on the class `cls`
        # to make it available for all instance. Since `env` create an new instance
        # of the model, each instance will regenared its own routing map and thus
        # regenerate its EndPoint. The routing map should be static.
        routing_map = werkzeug.routing.Map(strict_slashes=False, converters=self._get_converters())
        for url, endpoint in self._generate_routing_rules(mods, converters=self._get_converters()):
            routing = submap(endpoint.routing, ROUTING_KEYS)
            if routing['methods'] is not None and 'OPTIONS' not in routing['methods']:
                routing['methods'] = [*routing['methods'], 'OPTIONS']
            rule = FasterRule(url, endpoint=endpoint, **routing)
            rule.merge_slashes = False
            routing_map.add(rule)
        return routing_map

    @api.autovacuum
    def _gc_sessions(self):
        if os.getenv("ODOO_SKIP_GC_SESSIONS"):
            return
        http.root.session_store.vacuum(max_lifetime=http.get_session_max_inactivity(self.env))

    @api.model
    def get_translations_for_webclient(self, modules, lang):
        if not modules:
            modules = self.pool._init_modules
        if not lang:
            lang = self._context.get("lang")
        lang_data = self.env['res.lang']._get_data(code=lang)
        lang_params = {
            "name": lang_data.name,
            "code": lang_data.code,
            "direction": lang_data.direction,
            "date_format": lang_data.date_format,
            "time_format": lang_data.time_format,
            "short_time_format": lang_data.short_time_format,
            "grouping": lang_data.grouping,
            "decimal_point": lang_data.decimal_point,
            "thousands_sep": lang_data.thousands_sep,
            "week_start": int(lang_data.week_start),
        } if lang_data else None

        # Regional languages (ll_CC) must inherit/override their parent lang (ll), but this is
        # done server-side when the language is loaded, so we only need to load the user's lang.
        translations_per_module = {}
        for module in modules:
            translations_per_module[module] = code_translations.get_web_translations(module, lang)

        return translations_per_module, lang_params

    @api.model
    @tools.ormcache('frozenset(modules)', 'lang')
    def get_web_translations_hash(self, modules, lang):
        translations, lang_params = self.get_translations_for_webclient(modules, lang)
        translation_cache = {
            'lang_parameters': lang_params,
            'modules': translations,
            'lang': lang,
            'multi_lang': len(self.env['res.lang'].sudo().get_installed()) > 1,
        }
        return hashlib.sha1(json.dumps(translation_cache, sort_keys=True, default=json_default).encode()).hexdigest()

    @classmethod
    def _is_allowed_cookie(cls, cookie_type):
        return True if cookie_type == 'required' else bool(request.env.user)

    @api.model
    def _verify_request_recaptcha_token(self, action):
        return True