"""Integration-style checks for inference wiring and transport/session flows."""

from __future__ import annotations

import json
import os
import sys
from pathlib import Path
from subprocess import CompletedProcess
from types import SimpleNamespace
from typing import Any

from fastapi.testclient import TestClient

_ROOT = Path(__file__).resolve().parents[1]
if str(_ROOT) not in sys.path:
    sys.path.insert(0, str(_ROOT))

import inference  # noqa: E402
import env_loader  # noqa: E402
import server.app as app_module  # noqa: E402
from client import DataOpsEnvClient  # noqa: E402
from models import DataOpsAction  # noqa: E402


class _FakeResponse:
    def __init__(self, payload: dict[str, Any]) -> None:
        self._payload = payload

    def raise_for_status(self) -> None:
        return None

    def json(self) -> dict[str, Any]:
        return self._payload


class _FakeHTTPSession:
    def __init__(self) -> None:
        self.urls: list[str] = []
        self._step_count = 0

    def request(
        self,
        method: str,
        url: str,
        timeout: float | None = None,
        **kwargs: Any,
    ) -> _FakeResponse:
        del method, timeout, kwargs
        self.urls.append(url)
        if url.endswith("/reset"):
            self._step_count = 0
            return _FakeResponse(
                {
                    "observation": {
                        "status": "success",
                        "message": "Repair the ETL job.",
                    },
                    "reward": 0.0,
                    "done": False,
                }
            )
        if url.endswith("/step"):
            self._step_count += 1
            return _FakeResponse(
                {
                    "observation": {
                        "status": "success",
                        "message": "Read ok.",
                    },
                    "reward": 0.0,
                    "done": self._step_count >= 2,
                }
            )
        if url.endswith("/grader/task_2_medium_syntax"):
            return _FakeResponse({"score": 0.25})
        raise AssertionError(f"Unexpected URL requested: {url}")


class _FakeChatCompletions:
    def __init__(self, messages: list[Any]) -> None:
        self._messages = iter(messages)

    def create(self, **kwargs: Any) -> Any:
        del kwargs
        message = next(self._messages)
        return SimpleNamespace(choices=[SimpleNamespace(message=message)])


class _FakeClient:
    def __init__(self, messages: list[Any]) -> None:
        self.chat = SimpleNamespace(completions=_FakeChatCompletions(messages))
        self.base_url = "https://model.local/v1"


def _tool_message(name: str, arguments: dict[str, Any]) -> Any:
    return SimpleNamespace(
        tool_calls=[
            SimpleNamespace(
                id="call-1",
                function=SimpleNamespace(
                    name=name,
                    arguments=json.dumps(arguments),
                ),
            )
        ]
    )


def test_inference_run_task_uses_env_base_url(monkeypatch, capsys) -> None:
    fake_http = _FakeHTTPSession()
    fake_client = _FakeClient(
        [
            _tool_message("read_file", {"filepath": "broken_pipeline.py"}),
            SimpleNamespace(tool_calls=[]),
            _tool_message("invoke_python", {"filepath": "broken_pipeline.py", "args": []}),
        ]
    )
    monkeypatch.setattr(inference, "ENV_BASE_URL", "http://env.local")
    monkeypatch.setattr(inference, "API_BASE_URL", "https://model.local/v1")
    monkeypatch.setattr(inference, "MODEL_NAME", "mock-model")

    score = inference.run_task(
        fake_client,
        fake_http,
        "task_2_medium_syntax",
        max_turns=4,
        seed=3,
    )

    assert score == 0.25
    assert fake_http.urls
    assert all(url.startswith("http://env.local") for url in fake_http.urls)
    assert all("model.local" not in url for url in fake_http.urls)

    stdout = capsys.readouterr().out
    assert "[START]" in stdout
    assert "[STEP]" in stdout
    assert "[END]" in stdout
    assert "success=false" in stdout


def test_inference_normalizes_boundary_grader_scores(monkeypatch, capsys) -> None:
    class _PerfectScoreHTTPSession(_FakeHTTPSession):
        def request(
            self,
            method: str,
            url: str,
            timeout: float | None = None,
            **kwargs: Any,
        ) -> _FakeResponse:
            if url.endswith("/grader/task_2_medium_syntax"):
                return _FakeResponse({"score": 1.0})
            return super().request(method, url, timeout=timeout, **kwargs)

    fake_http = _PerfectScoreHTTPSession()
    fake_client = _FakeClient([SimpleNamespace(tool_calls=[]) for _ in range(4)])
    monkeypatch.setattr(inference, "ENV_BASE_URL", "http://env.local")
    monkeypatch.setattr(inference, "MODEL_NAME", "mock-model")

    score = inference.run_task(
        fake_client,
        fake_http,
        "task_2_medium_syntax",
        max_turns=4,
        seed=3,
    )

    assert score == inference.MAX_REPORTED_SCORE
    stdout = capsys.readouterr().out
    assert "success=true" in stdout
    assert "score=0.99" in stdout


def test_inference_emits_grader_details_to_stderr_when_enabled(monkeypatch, capsys) -> None:
    class _DetailedHTTPSession(_FakeHTTPSession):
        def request(
            self,
            method: str,
            url: str,
            timeout: float | None = None,
            **kwargs: Any,
        ) -> _FakeResponse:
            if url.endswith("/grader/task_2_medium_syntax"):
                return _FakeResponse(
                    {
                        "task_id": "task_2_medium_syntax",
                        "score": 0.25,
                        "details": {"reason": "Visible repair only"},
                    }
                )
            return super().request(method, url, timeout=timeout, **kwargs)

    fake_http = _DetailedHTTPSession()
    fake_client = _FakeClient(
        [_tool_message("read_file", {"filepath": "broken_pipeline.py"})]
    )
    monkeypatch.setenv("PUBLIC_GRADER_DETAILS", "true")
    monkeypatch.setattr(inference, "ENV_BASE_URL", "http://env.local")
    monkeypatch.setattr(inference, "MODEL_NAME", "mock-model")

    inference.run_task(
        fake_client,
        fake_http,
        "task_2_medium_syntax",
        max_turns=1,
        seed=3,
    )

    stderr = capsys.readouterr().err.strip()
    assert stderr
    assert json.loads(stderr)["details"]["reason"] == "Visible repair only"


def test_baseline_endpoint_passes_env_base_url(monkeypatch) -> None:
    captured: dict[str, Any] = {}

    def fake_run(
        command: list[str],
        *,
        cwd: str,
        capture_output: bool,
        text: bool,
        timeout: float,
        env: dict[str, str],
    ) -> CompletedProcess[str]:
        captured["command"] = command
        captured["cwd"] = cwd
        captured["capture_output"] = capture_output
        captured["text"] = text
        captured["timeout"] = timeout
        captured["env"] = env
        stdout = "\n".join(
            [
                "[START] task=task_1_easy_anomaly env=dataops_env model=fake-model",
                "[END] success=true steps=1 score=0.99 rewards=1.00",
                json.dumps(
                    {
                        "scores": {"task_1_easy_anomaly": 0.99},
                        "grades": {
                            "task_1_easy_anomaly": {
                                "task_id": "task_1_easy_anomaly",
                                "score": 0.99,
                                "details": {"reason": "Perfect"},
                            }
                        },
                        "average": 0.99,
                        "model": "fake-model",
                        "metadata": {"env_base_url": "http://127.0.0.1:7860"},
                    }
                ),
            ]
        )
        stderr = json.dumps({"task_id": "task_1_easy_anomaly", "score": 0.99})
        return CompletedProcess(command, 0, stdout=stdout, stderr=stderr)

    monkeypatch.setenv("API_KEY", "test-key")
    monkeypatch.delenv("ENV_BASE_URL", raising=False)
    monkeypatch.setattr(app_module.subprocess, "run", fake_run)

    with TestClient(app_module.app) as client:
        response = client.post(
            "/baseline",
            json={
                "task_ids": ["task_1_easy_anomaly"],
                "seed": 7,
                "max_turns": 5,
            },
        )

    assert response.status_code == 200
    assert "[START] task=task_1_easy_anomaly" in response.json()["stdout"]
    assert response.json()["stderr"] == json.dumps({"task_id": "task_1_easy_anomaly", "score": 0.99})
    assert response.json()["scores"]["task_1_easy_anomaly"] == 0.99
    assert response.json()["grades"]["task_1_easy_anomaly"]["details"]["reason"] == "Perfect"
    assert captured["env"]["ENV_BASE_URL"] == "http://127.0.0.1:7860"
    assert "--seed" in captured["command"]
    assert "--max-turns" in captured["command"]
    assert "--task" in captured["command"]


def test_inference_default_api_base_url_uses_google_for_api_key(
    monkeypatch,
) -> None:
    monkeypatch.setenv("API_KEY", "test-key")
    monkeypatch.delenv("HF_TOKEN", raising=False)
    monkeypatch.delenv("API_BASE_URL", raising=False)

    assert (
        inference._resolve_api_base_url()
        == inference.DEFAULT_GOOGLE_OPENAI_BASE_URL
    )


def test_inference_default_api_base_url_uses_hf_router_for_hf_token(
    monkeypatch,
) -> None:
    monkeypatch.setenv("HF_TOKEN", "test-token")
    monkeypatch.delenv("API_KEY", raising=False)
    monkeypatch.delenv("API_BASE_URL", raising=False)

    assert inference._resolve_api_base_url() == inference.DEFAULT_HF_OPENAI_BASE_URL


def test_session_id_header_can_resume_http_episode() -> None:
    with TestClient(app_module.app) as client:
        reset = client.post("/reset?task_id=task_1_easy_anomaly", json={"seed": 5})
        assert reset.status_code == 200
        session_id = reset.headers["X-Session-ID"]
        client.cookies.clear()

        state = client.get("/state", headers={"X-Session-ID": session_id})
        assert state.status_code == 200
        payload = state.json()
        assert payload["task_id"] == "task_1_easy_anomaly"
        assert payload["seed"] == 5


def test_reset_replaces_unknown_client_supplied_session_id() -> None:
    with TestClient(app_module.app) as client:
        reset = client.post(
            "/reset?task_id=task_1_easy_anomaly",
            headers={"X-Session-ID": "attacker-chosen-session"},
            json={"seed": 4},
        )
        assert reset.status_code == 200
        issued_session_id = reset.headers["X-Session-ID"]
        assert issued_session_id != "attacker-chosen-session"

        client.cookies.clear()
        forged_state = client.get("/state", headers={"X-Session-ID": "attacker-chosen-session"})
        assert forged_state.status_code == 400

        restored_state = client.get("/state", headers={"X-Session-ID": issued_session_id})
        assert restored_state.status_code == 200
        assert restored_state.json()["seed"] == 4


def test_websocket_reset_state_and_step_flow() -> None:
    with TestClient(app_module.app) as client:
        with client.websocket_connect("/ws") as websocket:
            websocket.send_json(
                {
                    "type": "reset",
                    "data": {"task_id": "task_1_easy_anomaly", "seed": 3},
                }
            )
            reset_payload = websocket.receive_json()
            assert reset_payload["data"]["observation"]["status"] == "success"

            websocket.send_json({"type": "state"})
            state_payload = websocket.receive_json()
            assert state_payload["data"]["task_id"] == "task_1_easy_anomaly"

            websocket.send_json(
                {
                    "type": "step",
                    "data": {
                        "action_type": "ExecuteSQL",
                        "payload": {
                            "query": (
                                "SELECT id, amount FROM transactions "
                                "WHERE amount IS NULL ORDER BY id"
                            )
                        },
                    },
                }
            )
            step_payload = websocket.receive_json()
            assert step_payload["data"]["observation"]["status"] == "success"
            assert step_payload["data"]["observation"]["sql_results"]

            websocket.send_json({"type": "close", "data": {}})


def test_http_client_overlays_top_level_reward_and_done() -> None:
    class _FakeSession:
        def post(self, url: str, **kwargs: Any) -> _FakeResponse:
            del kwargs
            if url.endswith("/reset"):
                return _FakeResponse(
                    {
                        "observation": {"status": "success", "message": "ready"},
                        "reward": 0.0,
                        "done": False,
                    }
                )
            if url.endswith("/step"):
                return _FakeResponse(
                    {
                        "observation": {"status": "success", "message": "ok"},
                        "reward": 0.25,
                        "done": True,
                    }
                )
            raise AssertionError(f"Unexpected URL requested: {url}")

        def get(self, url: str, **kwargs: Any) -> _FakeResponse:
            del kwargs
            raise AssertionError(f"Unexpected URL requested: {url}")

        def close(self) -> None:
            return None

    client = DataOpsEnvClient(base_url="http://env.local")
    client._session = _FakeSession()
    try:
        reset_obs = client.reset(task_id="task_1_easy_anomaly", seed=5)
        assert reset_obs.reward == 0.0
        assert reset_obs.done is False

        step_obs = client.step(
            DataOpsAction(
                action_type="ExecuteSQL",
                payload={"query": "SELECT 1"},
            )
        )
        assert step_obs.reward == 0.25
        assert step_obs.done is True
    finally:
        client.close()


def test_env_loader_uses_root_env_to_find_secondary_env_file(
    tmp_path: Path, monkeypatch
) -> None:
    monkeypatch.setattr(env_loader, "_PROJECT_ROOT", tmp_path)
    monkeypatch.delenv("PUBLIC_GRADER_DETAILS", raising=False)
    monkeypatch.delenv("MODEL_NAME", raising=False)

    (tmp_path / ".env").write_text("ENV_FILE=.env.dev\n", encoding="utf-8")
    (tmp_path / ".env.dev").write_text(
        "PUBLIC_GRADER_DETAILS=true\nMODEL_NAME=debug-model\n",
        encoding="utf-8",
    )

    env_loader.load_env()

    assert os.getenv("PUBLIC_GRADER_DETAILS") == "true"
    assert os.getenv("MODEL_NAME") == "debug-model"


def test_env_loader_preserves_external_runtime_env(
    tmp_path: Path, monkeypatch
) -> None:
    monkeypatch.setattr(env_loader, "_PROJECT_ROOT", tmp_path)
    monkeypatch.setenv("PORT", "7861")
    monkeypatch.delenv("MODEL_NAME", raising=False)

    (tmp_path / ".env").write_text("ENV_FILE=.env.dev\n", encoding="utf-8")
    (tmp_path / ".env.dev").write_text(
        "PORT=7860\nMODEL_NAME=debug-model\n",
        encoding="utf-8",
    )

    env_loader.load_env()

    assert os.getenv("PORT") == "7861"
    assert os.getenv("MODEL_NAME") == "debug-model"