from __future__ import annotations

import asyncio
import json
from typing import Any

import pytest
from fastapi import WebSocketDisconnect

import k1link.web.app as app_module
from k1link.device_plugins.xgrids_k1.facade import XGRIDS_K1_PLUGIN_ID
from k1link.web.app import INVALID_REQUEST_DETAIL, app
from k1link.web.plugin_runtime import PluginExecutionError


class _StateDispatcher:
    async def invoke(
        self,
        plugin_id: str,
        action_id: str,
        payload: dict[str, Any],
    ) -> dict[str, Any]:
        del plugin_id, action_id, payload
        return {"phase": "idle"}


class _FailingSendWebSocket:
    def __init__(self, failure: Exception) -> None:
        self.failure = failure
        self.accepted = False

    async def accept(self) -> None:
        self.accepted = True

    async def send_json(self, payload: dict[str, Any]) -> None:
        del payload
        raise self.failure

    async def close(self, *, code: int, reason: str) -> None:
        del code, reason


async def _post_json(path: str, payload: dict[str, Any]) -> tuple[int, str]:
    body = json.dumps(payload).encode()
    request_sent = False
    response_messages: list[dict[str, Any]] = []

    async def receive() -> dict[str, Any]:
        nonlocal request_sent
        if request_sent:
            return {"type": "http.disconnect"}
        request_sent = True
        return {"type": "http.request", "body": body, "more_body": False}

    async def send(message: dict[str, Any]) -> None:
        response_messages.append(message)

    scope: dict[str, Any] = {
        "type": "http",
        "asgi": {"version": "3.0", "spec_version": "2.3"},
        "http_version": "1.1",
        "method": "POST",
        "scheme": "http",
        "path": path,
        "raw_path": path.encode(),
        "query_string": b"",
        "root_path": "",
        "headers": [
            (b"content-type", b"application/json"),
            (b"content-length", str(len(body)).encode()),
        ],
        "client": ("127.0.0.1", 41000),
        "server": ("127.0.0.1", 8765),
    }
    await app(scope, receive, send)

    start = next(
        message for message in response_messages if message["type"] == "http.response.start"
    )
    response_body = b"".join(
        message.get("body", b"")
        for message in response_messages
        if message["type"] == "http.response.body"
    )
    return int(start["status"]), response_body.decode()


@pytest.mark.parametrize(
    ("path", "wrap_input"),
    [
        (
            f"/api/v1/device-plugins/{XGRIDS_K1_PLUGIN_ID}/actions/network.provision",
            True,
        ),
        ("/api/connect", False),
    ],
)
def test_validation_errors_do_not_echo_sensitive_request_values(
    path: str,
    wrap_input: bool,
) -> None:
    sensitive_value = "x" * 300
    action_input = {
        "device_id": "synthetic-device",
        "ssid": "synthetic-network",
        "password": sensitive_value,
        "compatibility_attestation": {
            "firmware_version": "3.0.2",
            "topology": "direct-lan",
            "verification": "live-device-info",
        },
    }
    if wrap_input:
        state_status, state_response = asyncio.run(
            _post_json(
                (
                    f"/api/v1/device-plugins/{XGRIDS_K1_PLUGIN_ID}/actions/"
                    "state.read"
                ),
                {"input": {}},
            )
        )
        assert state_status == 200
        snapshot_runtime_id = json.loads(state_response)["state"][
            "snapshot_runtime_id"
        ]
        action_input["expected_snapshot_runtime_id"] = snapshot_runtime_id
    payload = {"input": action_input} if wrap_input else action_input

    status_code, response_text = asyncio.run(_post_json(path, payload))

    assert status_code == 422
    assert json.loads(response_text) == {"detail": INVALID_REQUEST_DETAIL}
    assert sensitive_value not in response_text
    assert sensitive_value[:32] not in response_text
    assert "input_value" not in response_text


def test_legacy_ble_scan_requires_an_explicit_snapshot_runtime_header() -> None:
    status_code, response_text = asyncio.run(
        _post_json("/api/ble/scan", {"duration_seconds": 1})
    )

    assert status_code == 422
    assert json.loads(response_text) == {"detail": INVALID_REQUEST_DETAIL}


def test_plugin_expected_state_preserves_its_non_gateway_http_status(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    class ExpectedStateDispatcher:
        async def invoke(
            self,
            plugin_id: str,
            action_id: str,
            payload: dict[str, Any],
        ) -> dict[str, Any]:
            del plugin_id, action_id, payload
            raise PluginExecutionError(
                "K1 не сообщил адрес общей локальной сети",
                http_status_code=409,
                reason_code="connection-verify-address-unavailable",
            )

    monkeypatch.setattr(app_module, "plugin_dispatcher", ExpectedStateDispatcher())

    status_code, response_text = asyncio.run(
        _post_json(
            "/api/v1/device-plugins/test.plugin/actions/connection.verify",
            {"input": {}},
        )
    )

    assert status_code == 409
    assert json.loads(response_text) == {"detail": "K1 не сообщил адрес общей локальной сети"}


@pytest.mark.parametrize(
    "failure",
    [
        WebSocketDisconnect(code=1001),
        RuntimeError("handler is closed"),
        RuntimeError(
            "unable to perform operation on <TCPTransport closed=True>; "
            "the handler is closed"
        ),
    ],
)
def test_device_plugin_events_treats_proven_transport_disconnect_as_completion(
    monkeypatch: pytest.MonkeyPatch,
    failure: Exception,
) -> None:
    websocket = _FailingSendWebSocket(failure)
    monkeypatch.setattr(app_module, "plugin_dispatcher", _StateDispatcher())

    asyncio.run(app_module.device_plugin_events(websocket, "test.plugin"))

    assert websocket.accepted is True


def test_device_plugin_events_propagates_arbitrary_send_runtime_error(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    websocket = _FailingSendWebSocket(RuntimeError("plugin state serialization failed"))
    monkeypatch.setattr(app_module, "plugin_dispatcher", _StateDispatcher())

    with pytest.raises(RuntimeError, match="plugin state serialization failed"):
        asyncio.run(app_module.device_plugin_events(websocket, "test.plugin"))