import re
from typing import TYPE_CHECKING, Any, Dict

import orjson
from django.core.exceptions import ValidationError

from zerver.lib.test_classes import ZulipTestCase
from zerver.lib.validator import check_widget_content
from zerver.lib.widget import get_widget_data, get_widget_type
from zerver.models import SubMessage, UserProfile

if TYPE_CHECKING:
    from django.test.client import _MonkeyPatchedWSGIResponse as TestHttpResponse


class WidgetContentTestCase(ZulipTestCase):
    def test_validation(self) -> None:
        def assert_error(obj: object, msg: str) -> None:
            with self.assertRaisesRegex(ValidationError, re.escape(msg)):
                check_widget_content(obj)

        assert_error(5, "widget_content is not a dict")

        assert_error({}, "widget_type is not in widget_content")

        assert_error(dict(widget_type="whatever"), "extra_data is not in widget_content")

        assert_error(dict(widget_type="zform", extra_data=4), "extra_data is not a dict")

        assert_error(dict(widget_type="bogus", extra_data={}), "unknown widget type: bogus")

        extra_data: Dict[str, Any] = {}
        obj = dict(widget_type="zform", extra_data=extra_data)

        assert_error(obj, "zform is missing type field")

        extra_data["type"] = "bogus"
        assert_error(obj, "unknown zform type: bogus")

        extra_data["type"] = "choices"
        assert_error(obj, "heading key is missing from extra_data")

        extra_data["heading"] = "whatever"
        assert_error(obj, "choices key is missing from extra_data")

        extra_data["choices"] = 99
        assert_error(obj, 'extra_data["choices"] is not a list')

        extra_data["choices"] = [99]
        assert_error(obj, 'extra_data["choices"][0] is not a dict')

        extra_data["choices"] = [
            dict(long_name="foo", reply="bar"),
        ]
        assert_error(obj, 'short_name key is missing from extra_data["choices"][0]')

        extra_data["choices"] = [
            dict(short_name="a", long_name="foo", reply="bar"),
        ]

        check_widget_content(obj)

    def test_message_error_handling(self) -> None:
        sender = self.example_user("cordelia")
        stream_name = "Verona"

        payload = dict(
            type="stream",
            to=stream_name,
            topic="whatever",
            content="whatever",
        )

        payload["widget_content"] = "{{{{{{"  # unparsable
        result = self.api_post(sender, "/api/v1/messages", payload)
        self.assert_json_error_contains(result, "Widgets: API programmer sent invalid JSON")

        bogus_data = dict(color="red", foo="bar", x=2)
        payload["widget_content"] = orjson.dumps(bogus_data).decode()
        result = self.api_post(sender, "/api/v1/messages", payload)
        self.assert_json_error_contains(result, "Widgets: widget_type is not in widget_content")

    def test_get_widget_data_for_non_widget_messages(self) -> None:
        # This is a pretty important test, despite testing the
        # "negative" case.  We never want widgets to interfere
        # with normal messages.

        test_messages = [
            "",
            "     ",
            "this is an ordinary message",
            "/bogus_command",
            "/me shrugs",
            "use /poll",
        ]

        for message in test_messages:
            self.assertEqual(get_widget_data(content=message), (None, None))

        # Add a positive check for context
        self.assertEqual(get_widget_data(content="/todo"), ("todo", None))

    def test_explicit_widget_content(self) -> None:
        # Users can send widget_content directly on messages
        # using the `widget_content` field.

        sender = self.example_user("cordelia")
        stream_name = "Verona"
        content = "does-not-matter"
        zform_data = dict(
            type="choices",
            heading="Options:",
            choices=[],
        )

        widget_content = dict(
            widget_type="zform",
            extra_data=zform_data,
        )

        check_widget_content(widget_content)

        payload = dict(
            type="stream",
            to=stream_name,
            topic="whatever",
            content=content,
            widget_content=orjson.dumps(widget_content).decode(),
        )
        result = self.api_post(sender, "/api/v1/messages", payload)
        self.assert_json_success(result)

        message = self.get_last_message()
        self.assertEqual(message.content, content)

        expected_submessage_content = dict(
            widget_type="zform",
            extra_data=zform_data,
        )

        submessage = SubMessage.objects.get(message_id=message.id)
        self.assertEqual(submessage.msg_type, "widget")
        self.assertEqual(orjson.loads(submessage.content), expected_submessage_content)

    def test_todo(self) -> None:
        # This also helps us get test coverage that could apply
        # to future widgets.

        sender = self.example_user("cordelia")
        stream_name = "Verona"
        content = "/todo"

        payload = dict(
            type="stream",
            to=stream_name,
            topic="whatever",
            content=content,
        )
        result = self.api_post(sender, "/api/v1/messages", payload)
        self.assert_json_success(result)

        message = self.get_last_message()
        self.assertEqual(message.content, content)

        expected_submessage_content = dict(
            widget_type="todo",
            extra_data=None,
        )

        submessage = SubMessage.objects.get(message_id=message.id)
        self.assertEqual(submessage.msg_type, "widget")
        self.assertEqual(orjson.loads(submessage.content), expected_submessage_content)

    def test_poll_command_extra_data(self) -> None:
        sender = self.example_user("cordelia")
        stream_name = "Verona"
        # We test for both trailing and leading spaces, along with blank lines
        # for the poll options.
        content = "/poll What is your favorite color?\n\nRed\nGreen  \n\n   Blue\n - Yellow"

        payload = dict(
            type="stream",
            to=stream_name,
            topic="whatever",
            content=content,
        )
        result = self.api_post(sender, "/api/v1/messages", payload)
        self.assert_json_success(result)

        message = self.get_last_message()
        self.assertEqual(message.content, content)

        expected_submessage_content = dict(
            widget_type="poll",
            extra_data=dict(
                options=["Red", "Green", "Blue", "Yellow"],
                question="What is your favorite color?",
            ),
        )

        submessage = SubMessage.objects.get(message_id=message.id)
        self.assertEqual(submessage.msg_type, "widget")
        self.assertEqual(orjson.loads(submessage.content), expected_submessage_content)

        # Now don't supply a question.

        content = "/poll"
        payload["content"] = content
        result = self.api_post(sender, "/api/v1/messages", payload)
        self.assert_json_success(result)

        expected_submessage_content = dict(
            widget_type="poll",
            extra_data=dict(
                options=[],
                question="",
            ),
        )

        message = self.get_last_message()
        self.assertEqual(message.content, content)
        submessage = SubMessage.objects.get(message_id=message.id)
        self.assertEqual(submessage.msg_type, "widget")
        self.assertEqual(orjson.loads(submessage.content), expected_submessage_content)

    def test_poll_permissions(self) -> None:
        cordelia = self.example_user("cordelia")
        hamlet = self.example_user("hamlet")
        stream_name = "Verona"
        content = "/poll Preference?\n\nyes\nno"

        payload = dict(
            type="stream",
            to=stream_name,
            topic="whatever",
            content=content,
        )
        result = self.api_post(cordelia, "/api/v1/messages", payload)
        self.assert_json_success(result)

        message = self.get_last_message()

        def post(sender: UserProfile, data: Dict[str, object]) -> "TestHttpResponse":
            payload = dict(
                message_id=message.id, msg_type="widget", content=orjson.dumps(data).decode()
            )
            return self.api_post(sender, "/api/v1/submessage", payload)

        result = post(cordelia, dict(type="question", question="Tabs or spaces?"))
        self.assert_json_success(result)

        result = post(hamlet, dict(type="question", question="Tabs or spaces?"))
        self.assert_json_error(result, "You can't edit a question unless you are the author.")

    def test_poll_type_validation(self) -> None:
        sender = self.example_user("cordelia")
        stream_name = "Verona"
        content = "/poll Preference?\n\nyes\nno"

        payload = dict(
            type="stream",
            to=stream_name,
            topic="whatever",
            content=content,
        )
        result = self.api_post(sender, "/api/v1/messages", payload)
        self.assert_json_success(result)

        message = self.get_last_message()

        def post_submessage(content: str) -> "TestHttpResponse":
            payload = dict(
                message_id=message.id,
                msg_type="widget",
                content=content,
            )
            return self.api_post(sender, "/api/v1/submessage", payload)

        def assert_error(content: str, error: str) -> None:
            result = post_submessage(content)
            self.assert_json_error_contains(result, error)

        assert_error("bogus", "Invalid json for submessage")
        assert_error('""', "not a dict")
        assert_error("[]", "not a dict")

        assert_error('{"type": "bogus"}', "Unknown type for poll data: bogus")
        assert_error('{"type": "vote"}', "key is missing")
        assert_error('{"type": "vote", "key": "1,1,", "vote": 99}', "Invalid poll data")

        assert_error('{"type": "question"}', "key is missing")
        assert_error('{"type": "question", "question": 7}', "not a string")

        assert_error('{"type": "new_option"}', "key is missing")
        assert_error('{"type": "new_option", "idx": 7, "option": 999}', "not a string")
        assert_error('{"type": "new_option", "idx": -1, "option": "pizza"}', "too small")
        assert_error('{"type": "new_option", "idx": 1001, "option": "pizza"}', "too large")
        assert_error('{"type": "new_option", "idx": "bogus", "option": "maybe"}', "not an int")

        def assert_success(data: Dict[str, object]) -> None:
            content = orjson.dumps(data).decode()
            result = post_submessage(content)
            self.assert_json_success(result)

        # Note that we only validate for types. The server code may, for,
        # example, allow a vote for a non-existing option, and we rely
        # on the clients to ignore those.

        assert_success(dict(type="vote", key="1,1", vote=1))
        assert_success(dict(type="new_option", idx=7, option="maybe"))
        assert_success(dict(type="question", question="what's for dinner?"))

    def test_todo_type_validation(self) -> None:
        sender = self.example_user("cordelia")
        stream_name = "Verona"
        content = "/todo"

        payload = dict(
            type="stream",
            to=stream_name,
            topic="whatever",
            content=content,
        )
        result = self.api_post(sender, "/api/v1/messages", payload)
        self.assert_json_success(result)

        message = self.get_last_message()

        def post_submessage(content: str) -> "TestHttpResponse":
            payload = dict(
                message_id=message.id,
                msg_type="widget",
                content=content,
            )
            return self.api_post(sender, "/api/v1/submessage", payload)

        def assert_error(content: str, error: str) -> None:
            result = post_submessage(content)
            self.assert_json_error_contains(result, error)

        assert_error('{"type": "bogus"}', "Unknown type for todo data: bogus")

        assert_error('{"type": "new_task"}', "key is missing")
        assert_error(
            '{"type": "new_task", "key": 7, "task": 7, "desc": "", "completed": false}',
            'data["task"] is not a string',
        )
        assert_error(
            '{"type": "new_task", "key": -1, "task": "eat", "desc": "", "completed": false}',
            'data["key"] is too small',
        )
        assert_error(
            '{"type": "new_task", "key": 1001, "task": "eat", "desc": "", "completed": false}',
            'data["key"] is too large',
        )

        assert_error('{"type": "strike"}', "key is missing")
        assert_error('{"type": "strike", "key": 999}', 'data["key"] is not a string')

        def assert_success(data: Dict[str, object]) -> None:
            content = orjson.dumps(data).decode()
            result = post_submessage(content)
            self.assert_json_success(result)

        assert_success(dict(type="new_task", key=7, task="eat", desc="", completed=False))
        assert_success(dict(type="strike", key="5,9"))

    def test_get_widget_type(self) -> None:
        sender = self.example_user("cordelia")
        stream_name = "Verona"
        # We test for both trailing and leading spaces, along with blank lines
        # for the poll options.
        content = "/poll Preference?\n\nyes\nno"

        payload = dict(
            type="stream",
            to=stream_name,
            topic="whatever",
            content=content,
        )
        result = self.api_post(sender, "/api/v1/messages", payload)
        self.assert_json_success(result)

        message = self.get_last_message()

        [submessage] = SubMessage.objects.filter(message_id=message.id)

        self.assertEqual(get_widget_type(message_id=message.id), "poll")

        submessage.content = "bogus non-json"
        submessage.save()
        self.assertEqual(get_widget_type(message_id=message.id), None)

        submessage.content = '{"bogus": 1}'
        submessage.save()
        self.assertEqual(get_widget_type(message_id=message.id), None)

        submessage.content = '{"widget_type": "todo"}'
        submessage.save()
        self.assertEqual(get_widget_type(message_id=message.id), "todo")
