import io
import os.path
from typing import List, Tuple, Type

import pytest
from fastapi import UploadFile

from pynecone import constants
from pynecone.app import App, DefaultState, process, upload
from pynecone.components import Box
from pynecone.event import Event, get_hydrate_event
from pynecone.middleware import HydrateMiddleware
from pynecone.state import State, StateUpdate
from pynecone.style import Style
from pynecone.utils import format
from pynecone.vars import ComputedVar


@pytest.fixture
def app() -> App:
    """A base app.

    Returns:
        The app.
    """
    return App()


@pytest.fixture
def index_page():
    """An index page.

    Returns:
        The index page.
    """

    def index():
        return Box.create("Index")

    return index


@pytest.fixture
def about_page():
    """An about page.

    Returns:
        The about page.
    """

    def about():
        return Box.create("About")

    return about


@pytest.fixture()
def test_state() -> Type[State]:
    """A default state.

    Returns:
        A default state.
    """

    class TestState(State):
        var: int

    return TestState


def test_default_app(app: App):
    """Test creating an app with no args.

    Args:
        app: The app to test.
    """
    assert app.state() == DefaultState()
    assert app.middleware == [HydrateMiddleware()]
    assert app.style == Style()


def test_add_page_default_route(app: App, index_page, about_page):
    """Test adding a page to an app.

    Args:
        app: The app to test.
        index_page: The index page.
        about_page: The about page.
    """
    assert app.pages == {}
    app.add_page(index_page)
    assert set(app.pages.keys()) == {"index"}
    app.add_page(about_page)
    assert set(app.pages.keys()) == {"index", "about"}


def test_add_page_set_route(app: App, index_page, windows_platform: bool):
    """Test adding a page to an app.

    Args:
        app: The app to test.
        index_page: The index page.
        windows_platform: Whether the system is windows.
    """
    route = "test" if windows_platform else "/test"
    assert app.pages == {}
    app.add_page(index_page, route=route)
    assert set(app.pages.keys()) == {"test"}


def test_add_page_set_route_dynamic(app: App, index_page, windows_platform: bool):
    """Test adding a page with dynamic route variable to an app.

    Args:
        app: The app to test.
        index_page: The index page.
        windows_platform: Whether the system is windows.
    """
    route = "/test/[dynamic]"
    if windows_platform:
        route.lstrip("/").replace("/", "\\")
    assert app.pages == {}
    app.add_page(index_page, route=route)
    assert set(app.pages.keys()) == {"test/[dynamic]"}
    assert "dynamic" in app.state.computed_vars
    assert app.state.computed_vars["dynamic"].deps(objclass=DefaultState) == {
        constants.ROUTER_DATA
    }
    assert constants.ROUTER_DATA in app.state().computed_var_dependencies


def test_add_page_set_route_nested(app: App, index_page, windows_platform: bool):
    """Test adding a page to an app.

    Args:
        app: The app to test.
        index_page: The index page.
        windows_platform: Whether the system is windows.
    """
    route = "test\\nested" if windows_platform else "/test/nested"
    assert app.pages == {}
    app.add_page(index_page, route=route)
    assert set(app.pages.keys()) == {route.strip(os.path.sep)}


def test_initialize_with_state(test_state):
    """Test setting the state of an app.

    Args:
        test_state: The default state.
    """
    app = App(state=test_state)
    assert app.state == test_state

    # Get a state for a given token.
    token = "token"
    state = app.state_manager.get_state(token)
    assert isinstance(state, test_state)
    assert state.var == 0  # type: ignore


def test_set_and_get_state(test_state):
    """Test setting and getting the state of an app with different tokens.

    Args:
        test_state: The default state.
    """
    app = App(state=test_state)

    # Create two tokens.
    token1 = "token1"
    token2 = "token2"

    # Get the default state for each token.
    state1 = app.state_manager.get_state(token1)
    state2 = app.state_manager.get_state(token2)
    assert state1.var == 0  # type: ignore
    assert state2.var == 0  # type: ignore

    # Set the vars to different values.
    state1.var = 1
    state2.var = 2
    app.state_manager.set_state(token1, state1)
    app.state_manager.set_state(token2, state2)

    # Get the states again and check the values.
    state1 = app.state_manager.get_state(token1)
    state2 = app.state_manager.get_state(token2)
    assert state1.var == 1  # type: ignore
    assert state2.var == 2  # type: ignore


@pytest.mark.asyncio
async def test_dynamic_var_event(test_state):
    """Test that the default handler of a dynamic generated var
    works as expected.

    Args:
        test_state: State Fixture.
    """
    test_state = test_state()
    test_state.add_var("int_val", int, 0)
    result = await test_state._process(
        Event(
            token="fake-token",
            name="test_state.set_int_val",
            router_data={"pathname": "/", "query": {}},
            payload={"value": 50},
        )
    )
    assert result.delta == {"test_state": {"int_val": 50}}


@pytest.mark.asyncio
@pytest.mark.parametrize(
    "event_tuples",
    [
        pytest.param(
            [
                (
                    "test_state.make_friend",
                    {"test_state": {"plain_friends": ["Tommy", "another-fd"]}},
                ),
                (
                    "test_state.change_first_friend",
                    {"test_state": {"plain_friends": ["Jenny", "another-fd"]}},
                ),
            ],
            id="append then __setitem__",
        ),
        pytest.param(
            [
                (
                    "test_state.unfriend_first_friend",
                    {"test_state": {"plain_friends": []}},
                ),
                (
                    "test_state.make_friend",
                    {"test_state": {"plain_friends": ["another-fd"]}},
                ),
            ],
            id="delitem then append",
        ),
        pytest.param(
            [
                (
                    "test_state.make_friends_with_colleagues",
                    {"test_state": {"plain_friends": ["Tommy", "Peter", "Jimmy"]}},
                ),
                (
                    "test_state.remove_tommy",
                    {"test_state": {"plain_friends": ["Peter", "Jimmy"]}},
                ),
                (
                    "test_state.remove_last_friend",
                    {"test_state": {"plain_friends": ["Peter"]}},
                ),
                (
                    "test_state.unfriend_all_friends",
                    {"test_state": {"plain_friends": []}},
                ),
            ],
            id="extend, remove, pop, clear",
        ),
        pytest.param(
            [
                (
                    "test_state.add_jimmy_to_second_group",
                    {
                        "test_state": {
                            "friends_in_nested_list": [["Tommy"], ["Jenny", "Jimmy"]]
                        }
                    },
                ),
                (
                    "test_state.remove_first_person_from_first_group",
                    {
                        "test_state": {
                            "friends_in_nested_list": [[], ["Jenny", "Jimmy"]]
                        }
                    },
                ),
                (
                    "test_state.remove_first_group",
                    {"test_state": {"friends_in_nested_list": [["Jenny", "Jimmy"]]}},
                ),
            ],
            id="nested list",
        ),
        pytest.param(
            [
                (
                    "test_state.add_jimmy_to_tommy_friends",
                    {"test_state": {"friends_in_dict": {"Tommy": ["Jenny", "Jimmy"]}}},
                ),
                (
                    "test_state.remove_jenny_from_tommy",
                    {"test_state": {"friends_in_dict": {"Tommy": ["Jimmy"]}}},
                ),
                (
                    "test_state.tommy_has_no_fds",
                    {"test_state": {"friends_in_dict": {"Tommy": []}}},
                ),
            ],
            id="list in dict",
        ),
    ],
)
async def test_list_mutation_detection__plain_list(
    event_tuples: List[Tuple[str, List[str]]], list_mutation_state: State
):
    """Test list mutation detection
    when reassignment is not explicitly included in the logic.

    Args:
        event_tuples: From parametrization.
        list_mutation_state: A state with list mutation features.
    """
    for event_name, expected_delta in event_tuples:
        result = await list_mutation_state._process(
            Event(
                token="fake-token",
                name=event_name,
                router_data={"pathname": "/", "query": {}},
                payload={},
            )
        )

        assert result.delta == expected_delta


@pytest.mark.asyncio
@pytest.mark.parametrize(
    "event_tuples",
    [
        pytest.param(
            [
                (
                    "test_state.add_age",
                    {"test_state": {"details": {"name": "Tommy", "age": 20}}},
                ),
                (
                    "test_state.change_name",
                    {"test_state": {"details": {"name": "Jenny", "age": 20}}},
                ),
                (
                    "test_state.remove_last_detail",
                    {"test_state": {"details": {"name": "Jenny"}}},
                ),
            ],
            id="update then __setitem__",
        ),
        pytest.param(
            [
                (
                    "test_state.clear_details",
                    {"test_state": {"details": {}}},
                ),
                (
                    "test_state.add_age",
                    {"test_state": {"details": {"age": 20}}},
                ),
            ],
            id="delitem then update",
        ),
        pytest.param(
            [
                (
                    "test_state.add_age",
                    {"test_state": {"details": {"name": "Tommy", "age": 20}}},
                ),
                (
                    "test_state.remove_name",
                    {"test_state": {"details": {"age": 20}}},
                ),
                (
                    "test_state.pop_out_age",
                    {"test_state": {"details": {}}},
                ),
            ],
            id="add, remove, pop",
        ),
        pytest.param(
            [
                (
                    "test_state.remove_home_address",
                    {"test_state": {"address": [{}, {"work": "work address"}]}},
                ),
                (
                    "test_state.add_street_to_home_address",
                    {
                        "test_state": {
                            "address": [
                                {"street": "street address"},
                                {"work": "work address"},
                            ]
                        }
                    },
                ),
            ],
            id="dict in list",
        ),
        pytest.param(
            [
                (
                    "test_state.change_friend_name",
                    {
                        "test_state": {
                            "friend_in_nested_dict": {
                                "name": "Nikhil",
                                "friend": {"name": "Tommy"},
                            }
                        }
                    },
                ),
                (
                    "test_state.add_friend_age",
                    {
                        "test_state": {
                            "friend_in_nested_dict": {
                                "name": "Nikhil",
                                "friend": {"name": "Tommy", "age": 30},
                            }
                        }
                    },
                ),
                (
                    "test_state.remove_friend",
                    {"test_state": {"friend_in_nested_dict": {"name": "Nikhil"}}},
                ),
            ],
            id="nested dict",
        ),
    ],
)
async def test_dict_mutation_detection__plain_list(
    event_tuples: List[Tuple[str, List[str]]], dict_mutation_state: State
):
    """Test dict mutation detection
    when reassignment is not explicitly included in the logic.

    Args:
        event_tuples: From parametrization.
        dict_mutation_state: A state with dict mutation features.
    """
    for event_name, expected_delta in event_tuples:
        result = await dict_mutation_state._process(
            Event(
                token="fake-token",
                name=event_name,
                router_data={"pathname": "/", "query": {}},
                payload={},
            )
        )

        assert result.delta == expected_delta


@pytest.mark.asyncio
@pytest.mark.parametrize(
    "fixture, expected",
    [
        (
            "upload_state",
            {"file_upload_state": {"img_list": ["image1.jpg", "image2.jpg"]}},
        ),
        (
            "upload_sub_state",
            {
                "file_state.file_upload_state": {
                    "img_list": ["image1.jpg", "image2.jpg"]
                }
            },
        ),
        (
            "upload_grand_sub_state",
            {
                "base_file_state.file_sub_state.file_upload_state": {
                    "img_list": ["image1.jpg", "image2.jpg"]
                }
            },
        ),
    ],
)
async def test_upload_file(fixture, request, expected):
    """Test that file upload works correctly.

    Args:
        fixture: The state.
        request: Fixture request.
        expected: Expected delta
    """
    data = b"This is binary data"

    # Create a binary IO object and write data to it
    bio = io.BytesIO()
    bio.write(data)

    app = App(state=request.getfixturevalue(fixture))

    file1 = UploadFile(
        filename="token:file_upload_state.multi_handle_upload:True:image1.jpg",
        file=bio,
        content_type="image/jpeg",
    )
    file2 = UploadFile(
        filename="token:file_upload_state.multi_handle_upload:True:image2.jpg",
        file=bio,
        content_type="image/jpeg",
    )
    fn = upload(app)
    result = await fn([file1, file2])  # type: ignore
    assert isinstance(result, StateUpdate)
    assert result.delta == expected


@pytest.mark.asyncio
@pytest.mark.parametrize(
    "fixture", ["upload_state", "upload_sub_state", "upload_grand_sub_state"]
)
async def test_upload_file_without_annotation(fixture, request):
    """Test that an error is thrown when there's no param annotated with pc.UploadFile or List[UploadFile].

    Args:
        fixture: The state.
        request: Fixture request.
    """
    data = b"This is binary data"

    # Create a binary IO object and write data to it
    bio = io.BytesIO()
    bio.write(data)

    app = App(state=request.getfixturevalue(fixture))

    file1 = UploadFile(
        filename="token:file_upload_state.handle_upload2:True:image1.jpg",
        file=bio,
        content_type="image/jpeg",
    )
    file2 = UploadFile(
        filename="token:file_upload_state.handle_upload2:True:image2.jpg",
        file=bio,
        content_type="image/jpeg",
    )
    fn = upload(app)
    with pytest.raises(ValueError) as err:
        await fn([file1, file2])
    assert (
        err.value.args[0]
        == "`file_upload_state.handle_upload2` handler should have a parameter annotated as List[pc.UploadFile]"
    )


class DynamicState(State):
    """State class for testing dynamic route var.

    This is defined at module level because event handlers cannot be addressed
    correctly when the class is defined as a local.

    There are several counters:
      * loaded: counts how many times `on_load` was triggered by the hydrate middleware
      * counter: counts how many times `on_counter` was triggered by a non-naviagational event
          -> these events should NOT trigger reload or recalculation of router_data dependent vars
      * side_effect_counter: counts how many times a computed var was
        recalculated when the dynamic route var was dirty
    """

    loaded: int = 0
    counter: int = 0
    # side_effect_counter: int = 0

    def on_load(self):
        """Event handler for page on_load, should trigger for all navigation events."""
        self.loaded = self.loaded + 1

    def on_counter(self):
        """Increment the counter var."""
        self.counter = self.counter + 1

    @ComputedVar
    def comp_dynamic(self) -> str:
        """A computed var that depends on the dynamic var.

        Returns:
            same as self.dynamic
        """
        # self.side_effect_counter = self.side_effect_counter + 1
        return self.dynamic


@pytest.mark.asyncio
async def test_dynamic_route_var_route_change_completed_on_load(
    index_page,
    windows_platform: bool,
):
    """Create app with dynamic route var, and simulate navigation.

    on_load should fire, allowing any additional vars to be updated before the
    initial page hydrate.

    Args:
        index_page: The index page.
        windows_platform: Whether the system is windows.
    """
    arg_name = "dynamic"
    route = f"/test/[{arg_name}]"
    if windows_platform:
        route.lstrip("/").replace("/", "\\")
    app = App(state=DynamicState)
    assert arg_name not in app.state.vars
    app.add_page(index_page, route=route, on_load=DynamicState.on_load)  # type: ignore
    assert arg_name in app.state.vars
    assert arg_name in app.state.computed_vars
    assert app.state.computed_vars[arg_name].deps(objclass=DynamicState) == {
        constants.ROUTER_DATA
    }
    assert constants.ROUTER_DATA in app.state().computed_var_dependencies

    token = "mock_token"
    sid = "mock_sid"
    client_ip = "127.0.0.1"
    state = app.state_manager.get_state(token)
    assert state.dynamic == ""
    exp_vals = ["foo", "foobar", "baz"]

    def _event(name, val, **kwargs):
        return Event(
            token=kwargs.pop("token", token),
            name=name,
            router_data=kwargs.pop(
                "router_data", {"pathname": route, "query": {arg_name: val}}
            ),
            payload=kwargs.pop("payload", {}),
            **kwargs,
        )

    def _dynamic_state_event(name, val, **kwargs):
        return _event(
            name=format.format_event_handler(getattr(DynamicState, name)),  # type: ignore
            val=val,
            **kwargs,
        )

    for exp_index, exp_val in enumerate(exp_vals):
        update = await process(
            app,
            event=_event(name=get_hydrate_event(state), val=exp_val),
            sid=sid,
            headers={},
            client_ip=client_ip,
        )
        # route change triggers: [full state dict, call on_load events, call set_is_hydrated(True)]
        assert update == StateUpdate(
            delta={
                state.get_name(): {
                    arg_name: exp_val,
                    f"comp_{arg_name}": exp_val,
                    constants.IS_HYDRATED: False,
                    "loaded": exp_index,
                    "counter": exp_index,
                    # "side_effect_counter": exp_index,
                }
            },
            events=[
                _dynamic_state_event(name="on_load", val=exp_val, router_data={}),
                _dynamic_state_event(
                    name="set_is_hydrated",
                    payload={"value": "true"},
                    val=exp_val,
                    router_data={},
                ),
            ],
        )
        assert state.dynamic == exp_val
        on_load_update = await process(
            app,
            event=_dynamic_state_event(name="on_load", val=exp_val),
            sid=sid,
            headers={},
            client_ip=client_ip,
        )
        assert on_load_update == StateUpdate(
            delta={
                state.get_name(): {
                    # These computed vars _shouldn't_ be here, because they didn't change
                    arg_name: exp_val,
                    f"comp_{arg_name}": exp_val,
                    "loaded": exp_index + 1,
                },
            },
            events=[],
        )
        on_set_is_hydrated_update = await process(
            app,
            event=_dynamic_state_event(
                name="set_is_hydrated", payload={"value": True}, val=exp_val
            ),
            sid=sid,
            headers={},
            client_ip=client_ip,
        )
        assert on_set_is_hydrated_update == StateUpdate(
            delta={
                state.get_name(): {
                    # These computed vars _shouldn't_ be here, because they didn't change
                    arg_name: exp_val,
                    f"comp_{arg_name}": exp_val,
                    "is_hydrated": True,
                },
            },
            events=[],
        )

        # a simple state update event should NOT trigger on_load or route var side effects
        update = await process(
            app,
            event=_dynamic_state_event(name="on_counter", val=exp_val),
            sid=sid,
            headers={},
            client_ip=client_ip,
        )
        assert update == StateUpdate(
            delta={
                state.get_name(): {
                    # These computed vars _shouldn't_ be here, because they didn't change
                    f"comp_{arg_name}": exp_val,
                    arg_name: exp_val,
                    "counter": exp_index + 1,
                }
            },
            events=[],
        )
    assert state.loaded == len(exp_vals)
    assert state.counter == len(exp_vals)
    # print(f"Expected {exp_vals} rendering side effects, got {state.side_effect_counter}")
    # assert state.side_effect_counter == len(exp_vals)