from typing import Any, Dict, List, Mapping
from unittest import mock

from zerver.actions.submessage import do_add_submessage
from zerver.lib.message import MessageDict
from zerver.lib.test_classes import ZulipTestCase
from zerver.models import Message, SubMessage


class TestBasics(ZulipTestCase):
    def test_get_raw_db_rows(self) -> None:
        cordelia = self.example_user("cordelia")
        hamlet = self.example_user("hamlet")
        stream_name = "Verona"

        message_id = self.send_stream_message(
            sender=cordelia,
            stream_name=stream_name,
        )

        def get_raw_rows() -> List[Dict[str, Any]]:
            query = SubMessage.get_raw_db_rows([message_id])
            rows = list(query)
            return rows

        rows = get_raw_rows()
        self.assertEqual(rows, [])

        sm1 = SubMessage.objects.create(
            msg_type="whatever",
            content="stuff1",
            message_id=message_id,
            sender=cordelia,
        )

        sm2 = SubMessage.objects.create(
            msg_type="whatever",
            content="stuff2",
            message_id=message_id,
            sender=hamlet,
        )

        expected_data = [
            dict(
                id=sm1.id,
                message_id=message_id,
                sender_id=cordelia.id,
                msg_type="whatever",
                content="stuff1",
            ),
            dict(
                id=sm2.id,
                message_id=message_id,
                sender_id=hamlet.id,
                msg_type="whatever",
                content="stuff2",
            ),
        ]

        self.assertEqual(get_raw_rows(), expected_data)

        message = Message.objects.get(id=message_id)
        message_json = MessageDict.wide_dict(message)
        rows = message_json["submessages"]
        rows.sort(key=lambda r: r["id"])
        self.assertEqual(rows, expected_data)

        msg_rows = MessageDict.get_raw_db_rows([message_id])
        rows = msg_rows[0]["submessages"]
        rows.sort(key=lambda r: r["id"])
        self.assertEqual(rows, expected_data)

    def test_endpoint_errors(self) -> None:
        cordelia = self.example_user("cordelia")
        stream_name = "Verona"
        message_id = self.send_stream_message(
            sender=cordelia,
            stream_name=stream_name,
        )
        self.login_user(cordelia)

        payload = dict(
            message_id=message_id,
            msg_type="whatever",
            content="not json",
        )
        result = self.client_post("/json/submessage", payload)
        self.assert_json_error(result, "Invalid json for submessage")

        hamlet = self.example_user("hamlet")
        bad_message_id = self.send_personal_message(
            from_user=hamlet,
            to_user=hamlet,
        )
        payload = dict(
            message_id=bad_message_id,
            msg_type="whatever",
            content="does not matter",
        )
        result = self.client_post("/json/submessage", payload)
        self.assert_json_error(result, "Invalid message(s)")

    def test_original_sender_enforced(self) -> None:
        cordelia = self.example_user("cordelia")
        hamlet = self.example_user("hamlet")
        stream_name = "Verona"

        message_id = self.send_stream_message(
            sender=cordelia,
            stream_name=stream_name,
        )
        self.login_user(hamlet)

        payload = dict(
            message_id=message_id,
            msg_type="whatever",
            content="{}",
        )

        # Hamlet can't just go attaching submessages to Cordelia's
        # message, even though he does have read access here to the
        # message itself.
        result = self.client_post("/json/submessage", payload)
        self.assert_json_error(result, "You cannot attach a submessage to this message.")

        # Since Hamlet is actually subscribed to the stream, he is welcome
        # to send submessages to Cordelia once she initiates the "subconversation".
        do_add_submessage(
            realm=cordelia.realm,
            sender_id=cordelia.id,
            message_id=message_id,
            msg_type="whatever",
            content="whatever",
        )

        result = self.client_post("/json/submessage", payload)
        self.assert_json_success(result)

    def test_endpoint_success(self) -> None:
        cordelia = self.example_user("cordelia")
        hamlet = self.example_user("hamlet")
        stream_name = "Verona"
        message_id = self.send_stream_message(
            sender=cordelia,
            stream_name=stream_name,
        )
        self.login_user(cordelia)

        payload = dict(
            message_id=message_id,
            msg_type="whatever",
            content='{"name": "alice", "salary": 20}',
        )
        events: List[Mapping[str, Any]] = []
        with self.tornado_redirected_to_list(events, expected_num_events=1):
            result = self.client_post("/json/submessage", payload)
        self.assert_json_success(result)

        submessage = SubMessage.objects.get(message_id=message_id)

        expected_data = dict(
            message_id=message_id,
            submessage_id=submessage.id,
            content=payload["content"],
            msg_type="whatever",
            sender_id=cordelia.id,
            type="submessage",
        )

        data = events[0]["event"]
        self.assertEqual(data, expected_data)
        users = events[0]["users"]
        self.assertIn(cordelia.id, users)
        self.assertIn(hamlet.id, users)

        rows = SubMessage.get_raw_db_rows([message_id])
        self.assert_length(rows, 1)
        row = rows[0]

        expected_data = dict(
            id=row["id"],
            message_id=message_id,
            content='{"name": "alice", "salary": 20}',
            msg_type="whatever",
            sender_id=cordelia.id,
        )
        self.assertEqual(row, expected_data)

    def test_submessage_event_sent_after_transaction_commits(self) -> None:
        """
        Tests that `send_event` is hooked to `transaction.on_commit`. This is important, because
        we don't want to end up holding locks on message rows for too long if the event queue runs
        into a problem.
        """
        hamlet = self.example_user("hamlet")
        message_id = self.send_stream_message(hamlet, "Denmark")

        with self.tornado_redirected_to_list([], expected_num_events=1):
            with mock.patch("zerver.actions.submessage.send_event") as m:
                m.side_effect = AssertionError(
                    "Events should be sent only after the transaction commits."
                )
                do_add_submessage(hamlet.realm, hamlet.id, message_id, "whatever", "whatever")
