# Copyright (C) 2017-2024 RhodeCode GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License, version 3
# (only), as published by the Free Software Foundation.
#
# 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 Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# This program is dual-licensed. If you wish to learn more about the
# RhodeCode Enterprise Edition, including its added features, Support services,
# and proprietary license terms, please see https://rhodecode.com/licenses/

import logging
import datetime

from pyramid.response import Response

from rhodecode.apps._base import RepoAppView
from rhodecode.lib.feedgenerator import Rss201rev2Feed, Atom1Feed
from rhodecode.lib import audit_logger
from rhodecode.lib import rc_cache
from rhodecode.lib import helpers as h
from rhodecode.lib.auth import LoginRequired, HasRepoPermissionAnyDecorator
from rhodecode.lib.diffs import DiffProcessor, LimitedDiffContainer
from rhodecode.lib.utils2 import str2bool, safe_int, md5_safe
from rhodecode.model.db import UserApiKeys, CacheKey

log = logging.getLogger(__name__)


class RepoFeedView(RepoAppView):
    def load_default_context(self):
        c = self._get_local_tmpl_context()
        self._load_defaults()
        return c

    def _get_config(self):
        import rhodecode

        config = rhodecode.CONFIG

        return {
            "language": "en-us",
            "feed_ttl": "5",  # TTL of feed,
            "feed_include_diff": str2bool(config.get("rss_include_diff", False)),
            "feed_items_per_page": safe_int(config.get("rss_items_per_page", 20)),
            "feed_diff_limit":
            # we need to protect from parsing huge diffs here other way
            # we can kill the server
            safe_int(config.get("rss_cut_off_limit", 32 * 1024)),
        }

    def _load_defaults(self):
        _ = self.request.translate
        config = self._get_config()
        # common values for feeds
        self.description = _("Changes on %s repository")
        self.title = _("%s %s feed") % (self.db_repo_name, "%s")
        self.language = config["language"]
        self.ttl = config["feed_ttl"]
        self.feed_include_diff = config["feed_include_diff"]
        self.feed_diff_limit = config["feed_diff_limit"]
        self.feed_items_per_page = config["feed_items_per_page"]

    def _changes(self, commit):
        diff = commit.diff()
        diff_processor = DiffProcessor(diff, diff_format="newdiff", diff_limit=self.feed_diff_limit)
        _parsed = diff_processor.prepare(inline_diff=False)
        limited_diff = isinstance(_parsed, LimitedDiffContainer)

        return diff_processor, _parsed, limited_diff

    def _get_title(self, commit):
        return h.chop_at_smart(commit.message, "\n", suffix_if_chopped="...")

    def _get_description(self, commit):
        _renderer = self.request.get_partial_renderer("rhodecode:templates/feed/atom_feed_entry.mako")
        diff_processor, parsed_diff, limited_diff = self._changes(commit)
        filtered_parsed_diff, has_hidden_changes = self.path_filter.filter_patchset(parsed_diff)
        return _renderer(
            "body",
            commit=commit,
            parsed_diff=filtered_parsed_diff,
            limited_diff=limited_diff,
            feed_include_diff=self.feed_include_diff,
            diff_processor=diff_processor,
            has_hidden_changes=has_hidden_changes,
        )

    def _set_timezone(self, date, tzinfo=datetime.UTC):
        if not getattr(date, "tzinfo", None):
            date.replace(tzinfo=tzinfo)
        return date

    def _get_commits(self):
        pre_load = ["author", "branches", "date", "message", "parents"]
        if self.rhodecode_vcs_repo.is_empty():
            return []

        collection = self.rhodecode_vcs_repo.get_commits(
            branch_name=None, show_hidden=False, pre_load=pre_load, translate_tags=False
        )

        return list(collection[-self.feed_items_per_page :])

    def uid(self, repo_id, commit_id):
        return "{}:{}".format(md5_safe(repo_id, return_type="str"), md5_safe(commit_id, return_type="str"))

    @LoginRequired(auth_token_access=[UserApiKeys.ROLE_FEED])
    @HasRepoPermissionAnyDecorator("repository.read", "repository.write", "repository.admin")
    def atom(self):
        """
        Produce an atom-1.0 feed via feedgenerator module
        """
        self.load_default_context()
        force_recache = self.get_recache_flag()

        cache_namespace_uid = f"repo_feed.{self.db_repo.repo_id}"
        condition = not (self.path_filter.is_enabled or force_recache)
        region = rc_cache.get_or_create_region("cache_repo", cache_namespace_uid)

        @region.conditional_cache_on_arguments(namespace=cache_namespace_uid, condition=condition)
        def generate_atom_feed(repo_id, _repo_name, _commit_id, _feed_type):
            feed = Atom1Feed(
                title=self.title % "atom",
                link=h.route_url("repo_summary", repo_name=_repo_name),
                description=self.description % _repo_name,
                language=self.language,
                ttl=self.ttl,
            )

            for commit in reversed(self._get_commits()):
                date = self._set_timezone(commit.date)
                feed.add_item(
                    unique_id=self.uid(str(repo_id), commit.raw_id),
                    title=self._get_title(commit),
                    author_name=commit.author,
                    description=self._get_description(commit),
                    link=h.route_url("repo_commit", repo_name=_repo_name, commit_id=commit.raw_id),
                    pubdate=date,
                )

            return feed.content_type, feed.writeString("utf-8")

        commit_id = self.db_repo.changeset_cache.get("raw_id")
        content_type, feed = generate_atom_feed(self.db_repo.repo_id, self.db_repo.repo_name, commit_id, "atom")

        response = Response(feed)
        response.content_type = content_type
        return response

    @LoginRequired(auth_token_access=[UserApiKeys.ROLE_FEED])
    @HasRepoPermissionAnyDecorator("repository.read", "repository.write", "repository.admin")
    def rss(self):
        """
        Produce an rss2 feed via feedgenerator module
        """
        self.load_default_context()
        force_recache = self.get_recache_flag()

        cache_namespace_uid = f"repo_feed.{self.db_repo.repo_id}"
        condition = not (self.path_filter.is_enabled or force_recache)
        region = rc_cache.get_or_create_region("cache_repo", cache_namespace_uid)

        @region.conditional_cache_on_arguments(namespace=cache_namespace_uid, condition=condition)
        def generate_rss_feed(repo_id, _repo_name, _commit_id, _feed_type):
            feed = Rss201rev2Feed(
                title=self.title % "rss",
                link=h.route_url("repo_summary", repo_name=_repo_name),
                description=self.description % _repo_name,
                language=self.language,
                ttl=self.ttl,
            )

            for commit in reversed(self._get_commits()):
                date = self._set_timezone(commit.date)
                feed.add_item(
                    unique_id=self.uid(str(repo_id), commit.raw_id),
                    title=self._get_title(commit),
                    author_name=commit.author,
                    description=self._get_description(commit),
                    link=h.route_url("repo_commit", repo_name=_repo_name, commit_id=commit.raw_id),
                    pubdate=date,
                )
            return feed.content_type, feed.writeString("utf-8")

        commit_id = self.db_repo.changeset_cache.get("raw_id")
        content_type, feed = generate_rss_feed(self.db_repo.repo_id, self.db_repo.repo_name, commit_id, "rss")

        response = Response(feed)
        response.content_type = content_type
        return response
