#!/usr/bin/env python3

# Libervia: an XMPP client
# Copyright (C) 2009-2022 Jérôme Poisson (goffi@goffi.org)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero 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 Affero 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/>.

from copy import deepcopy
from unittest.mock import MagicMock, patch
from urllib import parse

import pytest
from pytest_twisted import ensureDeferred as ed
from twisted.words.protocols.jabber import jid
from twisted.web.server import Request
from wokkel import rsm, pubsub

from sat.core import exceptions
from sat.plugins import plugin_comp_ap_gateway
from sat.plugins.plugin_comp_ap_gateway.http_server import HTTPServer
from sat.tools.utils import xmpp_date
from sat.tools import xml_tools


TEST_BASE_URL = "https://example.org"
TEST_USER = "test_user"
TEST_AP_ACCOUNT = f"{TEST_USER}@example.org"

AP_REQUESTS = {
    f"{TEST_BASE_URL}/.well-known/webfinger?"
    f"resource=acct:{parse.quote(TEST_AP_ACCOUNT)}": {
        "aliases": [
            f"{TEST_BASE_URL}/@{TEST_USER}",
            f"{TEST_BASE_URL}/users/{TEST_USER}"
        ],
        "links": [
            {
                "href": f"{TEST_BASE_URL}/users/{TEST_USER}",
                "rel": "self",
                "type": "application/activity+json"
            },
        ],
        "subject": f"acct:{TEST_AP_ACCOUNT}"
    },

    f"{TEST_BASE_URL}/users/{TEST_USER}": {
        "@context": [
            "https://www.w3.org/ns/activitystreams",
        ],
        "endpoints": {
            "sharedInbox": f"{TEST_BASE_URL}/inbox"
        },
        "followers": f"{TEST_BASE_URL}/users/{TEST_USER}/followers",
        "following": f"{TEST_BASE_URL}/users/{TEST_USER}/following",
        "id": f"{TEST_BASE_URL}/users/{TEST_USER}",
        "inbox": f"{TEST_BASE_URL}/users/{TEST_USER}/inbox",
        "name": "",
        "outbox": f"{TEST_BASE_URL}/users/{TEST_USER}/outbox",
        "preferredUsername": f"{TEST_USER}",
        "type": "Person",
        "url": f"{TEST_BASE_URL}/@{TEST_USER}"
    },

    f"{TEST_BASE_URL}/users/{TEST_USER}/outbox": {
        "@context": "https://www.w3.org/ns/activitystreams",
        "first": f"{TEST_BASE_URL}/users/{TEST_USER}/outbox?page=true",
        "id": f"{TEST_BASE_URL}/users/{TEST_USER}/outbox",
        "last": f"{TEST_BASE_URL}/users/{TEST_USER}/outbox?page=true",
        "totalItems": 4,
        "type": "OrderedCollection"
    },
    f"{TEST_BASE_URL}/users/{TEST_USER}/outbox?page=true": {
        "@context": [
            "https://www.w3.org/ns/activitystreams",
        ],
        "id": f"{TEST_BASE_URL}/users/{TEST_USER}/outbox?page=true",
        "orderedItems": [
            {
                "actor": f"{TEST_BASE_URL}/users/{TEST_USER}",
                "cc": [
                    f"{TEST_BASE_URL}/users/{TEST_USER}/followers",
                ],
                "id": f"{TEST_BASE_URL}/users/{TEST_USER}/statuses/1/activity",
                "object": {
                    "attributedTo": f"{TEST_BASE_URL}/users/{TEST_USER}",
                    "cc": [
                        f"{TEST_BASE_URL}/users/{TEST_USER}/followers",
                    ],
                    "content": "<p>test message 1</p>",
                    "contentMap": {
                        "en": "<p>test message 1</p>"
                    },
                    "id": f"{TEST_BASE_URL}/users/{TEST_USER}/statuses/1",
                    "inReplyTo": None,
                    "published": "2021-12-16T17:28:03Z",
                    "sensitive": False,
                    "summary": None,
                    "tag": [],
                    "to": [
                        "https://www.w3.org/ns/activitystreams#Public"
                    ],
                    "type": "Note",
                    "url": f"{TEST_BASE_URL}/@{TEST_USER}/1"
                },
                "published": "2021-12-16T17:28:03Z",
                "to": [
                    "https://www.w3.org/ns/activitystreams#Public"
                ],
                "type": "Create"
            },
            {
                "actor": f"{TEST_BASE_URL}/users/{TEST_USER}",
                "cc": [
                    f"{TEST_BASE_URL}/users/{TEST_USER}/followers",
                ],
                "id": f"{TEST_BASE_URL}/users/{TEST_USER}/statuses/2/activity",
                "object": {
                    "attributedTo": f"{TEST_BASE_URL}/users/{TEST_USER}",
                    "cc": [
                        f"{TEST_BASE_URL}/users/{TEST_USER}/followers",
                    ],
                    "content": "<p>test message 2</p>",
                    "contentMap": {
                        "en": "<p>test message 2</p>"
                    },
                    "id": f"{TEST_BASE_URL}/users/{TEST_USER}/statuses/2",
                    "inReplyTo": None,
                    "published": "2021-12-16T17:27:03Z",
                    "sensitive": False,
                    "summary": None,
                    "tag": [],
                    "to": [
                        "https://www.w3.org/ns/activitystreams#Public"
                    ],
                    "type": "Note",
                    "url": f"{TEST_BASE_URL}/@{TEST_USER}/2"
                },
                "published": "2021-12-16T17:27:03Z",
                "to": [
                    "https://www.w3.org/ns/activitystreams#Public"
                ],
                "type": "Create"
            },
            {
                "actor": f"{TEST_BASE_URL}/users/{TEST_USER}",
                "cc": [
                    f"{TEST_BASE_URL}/users/{TEST_USER}/followers",
                ],
                "id": f"{TEST_BASE_URL}/users/{TEST_USER}/statuses/3/activity",
                "object": {
                    "attributedTo": f"{TEST_BASE_URL}/users/{TEST_USER}",
                    "cc": [
                        f"{TEST_BASE_URL}/users/{TEST_USER}/followers",
                    ],
                    "content": "<p>test message 3</p>",
                    "contentMap": {
                        "en": "<p>test message 3</p>"
                    },
                    "id": f"{TEST_BASE_URL}/users/{TEST_USER}/statuses/3",
                    "inReplyTo": None,
                    "published": "2021-12-16T17:26:03Z",
                    "sensitive": False,
                    "summary": None,
                    "tag": [],
                    "to": [
                        "https://www.w3.org/ns/activitystreams#Public"
                    ],
                    "type": "Note",
                    "url": f"{TEST_BASE_URL}/@{TEST_USER}/3"
                },
                "published": "2021-12-16T17:26:03Z",
                "to": [
                    "https://www.w3.org/ns/activitystreams#Public"
                ],
                "type": "Create"
            },
            {
                "actor": f"{TEST_BASE_URL}/users/{TEST_USER}",
                "cc": [
                    f"{TEST_BASE_URL}/users/{TEST_USER}/followers",
                ],
                "id": f"{TEST_BASE_URL}/users/{TEST_USER}/statuses/4/activity",
                "object": {
                    "attributedTo": f"{TEST_BASE_URL}/users/{TEST_USER}",
                    "cc": [
                        f"{TEST_BASE_URL}/users/{TEST_USER}/followers",
                    ],
                    "content": "<p>test message 4</p>",
                    "contentMap": {
                        "en": "<p>test message 4</p>"
                    },
                    "id": f"{TEST_BASE_URL}/users/{TEST_USER}/statuses/4",
                    "inReplyTo": None,
                    "published": "2021-12-16T17:25:03Z",
                    "sensitive": False,
                    "summary": None,
                    "tag": [],
                    "to": [
                        "https://www.w3.org/ns/activitystreams#Public"
                    ],
                    "type": "Note",
                    "url": f"{TEST_BASE_URL}/@{TEST_USER}/4"
                },
                "published": "2021-12-16T17:25:03Z",
                "to": [
                    "https://www.w3.org/ns/activitystreams#Public"
                ],
                "type": "Create"
            },
    ],
        "partOf": f"{TEST_BASE_URL}/users/{TEST_USER}/outbox",
        "prev": None,
        "type": "OrderedCollectionPage"
    }

}

XMPP_ITEM_TPL = """
<item id='{id}' publisher='{publisher_jid}'>
  <entry xmlns='http://www.w3.org/2005/Atom' xml:lang='en'>
    <title type='xhtml'>
      <div xmlns='http://www.w3.org/1999/xhtml'>
        <p>
          XMPP item {id}
        </p>
      </div>
    </title>
    <title type='text'>
      XMPP item {id}
    </title>
    <author>
      <name>
        test_user
      </name>
      <uri>
        xmpp:{publisher_jid}
      </uri>
    </author>
    <updated>
      {updated}
    </updated>
    <published>
      {published}
    </published>
    <id>
      xmpp:{publisher_jid}?;node=urn%3Axmpp%3Amicroblog%3A0;item={id}
    </id>
  </entry>
</item>
"""

ITEM_BASE_TS = 1643385499
XMPP_ITEMS = [
    xml_tools.parse(
        "".join(
            l.strip() for l in XMPP_ITEM_TPL.format(
                id=i,
                publisher_jid="some_user@test.example",
                updated=xmpp_date(ITEM_BASE_TS + i * 60),
                published=xmpp_date(ITEM_BASE_TS + i * 60),
            ).split("\n")
        ),
        namespace=pubsub.NS_PUBSUB
    )
    for i in range(1, 5)
]

async def mock_ap_get(url):
    return deepcopy(AP_REQUESTS[url])


async def mock_treq_json(data):
    return dict(data)


async def mock_getItems(*args, **kwargs):
    rsm_resp = rsm.RSMResponse(
        first=XMPP_ITEMS[0]["id"],
        last=XMPP_ITEMS[-1]["id"],
        index=0,
        count=len(XMPP_ITEMS)
    )
    return XMPP_ITEMS, {"rsm": rsm_resp.toDict(), "complete": True}


@pytest.fixture(scope="session")
def ap_gateway(host):
    gateway = plugin_comp_ap_gateway.APGateway(host)
    gateway.initialised = True
    client = MagicMock()
    client.jid = jid.JID("ap.test.example")
    client.host = "test.example"
    gateway.client = client
    gateway.local_only = True
    gateway.public_url = "test.example"
    gateway.ap_path = '_ap'
    gateway.base_ap_url = parse.urljoin(
        f"https://{gateway.public_url}",
        f"{gateway.ap_path}/"
    )
    gateway.server = HTTPServer(gateway)
    return gateway


class TestActivityPubGateway:

    @ed
    async def test_jid_and_node_convert_to_ap_handle(self, ap_gateway):
        """JID and pubsub node are converted correctly to an AP actor handle"""
        get_account = ap_gateway.getAPAccountFromJidAndNode

        # local jid
        assert await get_account(
            jid_ = jid.JID("simple@test.example"),
            node = None
        ) == "simple@test.example"

        # non local jid
        assert await get_account(
            jid_ = jid.JID("simple@example.org"),
            node = None
        ) == "___simple.40example.2eorg@ap.test.example"

        # local jid with non microblog node
        assert await get_account(
            jid_ = jid.JID("simple@test.example"),
            node = "some_other_node"
        ) == "some_other_node---simple@test.example"

        # local pubsub node
        with patch.object(ap_gateway, "isPubsub") as isPubsub:
            isPubsub.return_value = True
            assert await get_account(
                jid_ = jid.JID("pubsub.test.example"),
                node = "some_node"
            ) == "some_node@pubsub.test.example"

        # non local pubsub node
        with patch.object(ap_gateway, "isPubsub") as isPubsub:
            isPubsub.return_value = True
            assert await get_account(
                jid_ = jid.JID("pubsub.example.org"),
                node = "some_node"
            ) == "___some_node.40pubsub.2eexample.2eorg@ap.test.example"

    @ed
    async def test_ap_handle_convert_to_jid_and_node(self, ap_gateway, monkeypatch):
        """AP actor handle convert correctly to JID and pubsub node"""
        get_jid_node = ap_gateway.getJIDAndNode

        # for following assertion, host is not a pubsub service
        with patch.object(ap_gateway, "isPubsub") as isPubsub:
            isPubsub.return_value = False

            # simple local jid
            assert await get_jid_node(
                "toto@test.example"
            ) == (jid.JID("toto@test.example"), None)

            # simple external jid

            ## with "local_only" set, it should raise an exception
            with pytest.raises(exceptions.PermissionError):
                await get_jid_node("toto@example.org")

            ## with "local_only" unset, it should work
            with monkeypatch.context() as m:
                m.setattr(ap_gateway, "local_only", False, raising=True)
                assert await get_jid_node(
                    "toto@example.org"
                ) == (jid.JID("toto@example.org"), None)

            # explicit node
            assert await get_jid_node(
                "tata---toto@test.example"
            ) == (jid.JID("toto@test.example"), "tata")

        # for following assertion, host is a pubsub service
        with patch.object(ap_gateway, "isPubsub") as isPubsub:
            isPubsub.return_value = True

            # simple local node
            assert await get_jid_node(
                "toto@pubsub.test.example"
            ) == (jid.JID("pubsub.test.example"), "toto")

            # encoded local node
            assert await get_jid_node(
                "___urn.3axmpp.3amicroblog.3a0@pubsub.test.example"
            ) == (jid.JID("pubsub.test.example"), "urn:xmpp:microblog:0")

    @ed
    async def test_ap_to_pubsub_conversion(self, ap_gateway, monkeypatch):
        """AP requests are converted to pubsub"""
        monkeypatch.setattr(plugin_comp_ap_gateway.treq, "get", mock_ap_get)
        monkeypatch.setattr(plugin_comp_ap_gateway.treq, "json_content", mock_treq_json)
        monkeypatch.setattr(ap_gateway, "apGet", mock_ap_get)

        items, rsm_resp = await ap_gateway.getAPItems(TEST_AP_ACCOUNT, 2)

        assert rsm_resp.count == 4
        assert rsm_resp.index == 0
        assert rsm_resp.first == "https://example.org/users/test_user/statuses/4"
        assert rsm_resp.last == "https://example.org/users/test_user/statuses/3"

        assert items[0].entry.title.toXml() == (
            "<title xmlns='http://www.w3.org/2005/Atom' type='xhtml'>"
            "<div xmlns='http://www.w3.org/1999/xhtml'><p>test message 4</p></div>"
            "</title>"
        )
        author_uri = str(
            [e for e in items[0].entry.author.elements() if e.name == "uri"][0]
        )
        assert author_uri == "xmpp:test_user\\40example.org@ap.test.example"
        assert str(items[0].entry.published) == "2021-12-16T17:25:03Z"

        assert items[1].entry.title.toXml() == (
            "<title xmlns='http://www.w3.org/2005/Atom' type='xhtml'>"
            "<div xmlns='http://www.w3.org/1999/xhtml'><p>test message 3</p></div>"
            "</title>"
        )
        author_uri = str(
            [e for e in items[1].entry.author.elements() if e.name == "uri"][0]
        )
        assert author_uri == "xmpp:test_user\\40example.org@ap.test.example"
        assert str(items[1].entry.published) == "2021-12-16T17:26:03Z"

        items, rsm_resp = await ap_gateway.getAPItems(
            TEST_AP_ACCOUNT,
            max_items=2,
            after_id="https://example.org/users/test_user/statuses/3",
        )

        assert rsm_resp.count == 4
        assert rsm_resp.index == 2
        assert rsm_resp.first == "https://example.org/users/test_user/statuses/2"
        assert rsm_resp.last == "https://example.org/users/test_user/statuses/1"

        assert items[0].entry.title.toXml() == (
            "<title xmlns='http://www.w3.org/2005/Atom' type='xhtml'>"
            "<div xmlns='http://www.w3.org/1999/xhtml'><p>test message 2</p></div>"
            "</title>"
        )
        author_uri = str(
            [e for e in items[0].entry.author.elements() if e.name == "uri"][0]
        )
        assert author_uri == "xmpp:test_user\\40example.org@ap.test.example"
        assert str(items[0].entry.published) == "2021-12-16T17:27:03Z"

        assert items[1].entry.title.toXml() == (
            "<title xmlns='http://www.w3.org/2005/Atom' type='xhtml'>"
            "<div xmlns='http://www.w3.org/1999/xhtml'><p>test message 1</p></div>"
            "</title>"
        )
        author_uri = str(
            [e for e in items[1].entry.author.elements() if e.name == "uri"][0]
        )
        assert author_uri == "xmpp:test_user\\40example.org@ap.test.example"
        assert str(items[1].entry.published) == "2021-12-16T17:28:03Z"

        items, rsm_resp = await ap_gateway.getAPItems(
            TEST_AP_ACCOUNT,
            max_items=1,
            start_index=2
        )

        assert rsm_resp.count == 4
        assert rsm_resp.index == 2
        assert rsm_resp.first == "https://example.org/users/test_user/statuses/2"
        assert rsm_resp.last == "https://example.org/users/test_user/statuses/2"
        assert len(items) == 1

        assert items[0].entry.title.toXml() == (
            "<title xmlns='http://www.w3.org/2005/Atom' type='xhtml'>"
            "<div xmlns='http://www.w3.org/1999/xhtml'><p>test message 2</p></div>"
            "</title>"
        )
        assert str(items[0].entry.published) == "2021-12-16T17:27:03Z"

        items, rsm_resp = await ap_gateway.getAPItems(
            TEST_AP_ACCOUNT,
            max_items=3,
            chronological_pagination=False
        )
        assert rsm_resp.count == 4
        assert rsm_resp.index == 1
        assert rsm_resp.first == "https://example.org/users/test_user/statuses/3"
        assert rsm_resp.last == "https://example.org/users/test_user/statuses/1"
        assert len(items) == 3
        assert items[0].entry.title.toXml() == (
            "<title xmlns='http://www.w3.org/2005/Atom' type='xhtml'>"
            "<div xmlns='http://www.w3.org/1999/xhtml'><p>test message 3</p></div>"
            "</title>"
        )
        assert items[2].entry.title.toXml() == (
            "<title xmlns='http://www.w3.org/2005/Atom' type='xhtml'>"
            "<div xmlns='http://www.w3.org/1999/xhtml'><p>test message 1</p></div>"
            "</title>"
        )

    def ap_request_params(self, ap_gateway, type_=None, url=None, query_data=None):
        """Generate parameters for HTTPAPGServer's AP*Request

        @param type_: one of the AP query type (e.g. "outbox")
        @param url: URL to query (mutually exclusif with type_)
        @param query_data: query data as returned by parse.parse_qs
        @return dict with kw params to use
        """
        assert type_ and url is None or url and type_ is None
        if type_ is not None:
            path = f"_ap/{type_}/some_user%40test.example"
        else:
            url_parsed = parse.urlparse(url)
            path = url_parsed.path.lstrip("/")
            type_ = path.split("/")[1]
            if query_data is None:
                query_data = parse.parse_qs(url_parsed.query)

        if query_data:
            uri = f"{path}?{parse.urlencode(query_data, doseq=True)}"
        else:
            uri = path

        test_jid = jid.JID("some_user@test.example")
        request = Request(MagicMock())
        request.path = path.encode()
        request.uri = uri.encode()
        ap_url = parse.urljoin(
            f"https://{ap_gateway.public_url}",
            path
        )
        kwargs = {
            "request": request,
            "account_jid": test_jid,
            "node": None,
            "ap_account": test_jid.full(),
            "ap_url": ap_url,
        }
        if type_ == "outbox" and query_data:
            kwargs["query_data"] = query_data
        return kwargs

    @ed
    async def test_pubsub_to_ap_conversion(self, ap_gateway, monkeypatch):
        """Pubsub nodes are converted to AP collections"""
        monkeypatch.setattr(ap_gateway._p, "getItems", mock_getItems)
        outbox = await ap_gateway.server.resource.APOutboxRequest(
            **self.ap_request_params(ap_gateway, "outbox")
        )
        assert outbox["@context"] == "https://www.w3.org/ns/activitystreams"
        assert outbox["id"] == "https://test.example/_ap/outbox/some_user%40test.example"
        assert outbox["totalItems"] == len(XMPP_ITEMS)
        assert outbox["type"] == "OrderedCollection"
        assert outbox["first"]
        assert outbox["last"]

        first_page = await ap_gateway.server.resource.APOutboxPageRequest(
            **self.ap_request_params(ap_gateway, url=outbox["first"])
        )
        assert first_page["@context"] == "https://www.w3.org/ns/activitystreams"
        assert first_page["id"] == "https://test.example/_ap/outbox/some_user%40test.example?page=first"
        assert first_page["type"] == "OrderedCollectionPage"
        assert first_page["partOf"] == outbox["id"]
        assert len(first_page["orderedItems"]) == len(XMPP_ITEMS)
        first_item = first_page["orderedItems"][0]
        assert first_item["@context"] == "https://www.w3.org/ns/activitystreams"
        assert first_item["id"] == "https://test.example/_ap/item/some_user%40test.example/4"
        assert first_item["actor"] == "https://test.example/_ap/actor/some_user%40test.example"
        assert first_item["type"] == "Create"
        first_item_obj = first_item["object"]
        assert first_item_obj["id"] == first_item["id"]
        assert first_item_obj["type"] == "Note"
        assert first_item_obj["published"] == "2022-01-28T16:02:19Z"
        assert first_item_obj["attributedTo"] == first_item["actor"]
        assert first_item_obj["content"] == "<div><p>XMPP item 4</p></div>"
        assert first_item_obj["to"] == "https://www.w3.org/ns/activitystreams#Public"