"""Integration: the app boots through `create_app()` and serves the real surface.

Covers the HTTP contract of phase 01 task 03 — `/healthz`, the client shell at
`/`, the `/static` mount, path-traversal refusal, the startup hook, and the
security headers on every kind of response (PLAN.md §4, §11, A12).
"""

from __future__ import annotations

import dataclasses
import importlib
import logging
import sys
from collections.abc import Iterator
from pathlib import Path
from typing import TYPE_CHECKING, Any

import pytest
from fastapi import FastAPI
from fastapi.testclient import TestClient

from undercooked import __version__
from undercooked.config import ENV_KEYS, ConfigError, Settings, reset_settings_cache
from undercooked.server import app as app_module
from undercooked.server.app import (
    LOGGED_SETTINGS,
    STATIC_DIR,
    create_app,
    get_app,
    resolve_static_dir,
    settings_log_line,
)
from undercooked.server.headers import SECURITY_HEADERS

if TYPE_CHECKING:
    from collections.abc import Callable

    from starlette.types import Message

pytestmark = pytest.mark.integration

REPO_ROOT = Path(__file__).resolve().parents[2]
APP_LOGGER = "undercooked.server.app"

#: One route of every kind the app answers with: HTML page, JSON endpoint,
#: static asset, and the 404 that catches everything else.
ROUTE_KINDS = ("/", "/healthz", "/static/css/base.css", "/definitely-not-a-route")


@pytest.fixture(autouse=True)
def fresh_settings_cache() -> Iterator[None]:
    """No test may inherit a cached `Settings` (or a `.env` read) from another."""
    reset_settings_cache()
    yield
    reset_settings_cache()


async def _asgi_get(application: FastAPI, target: str) -> tuple[int, bytes]:
    """GET ``target`` against the ASGI app verbatim; return `(status, body)`.

    httpx normalizes dot-segments, so a traversal attempt written through
    `TestClient` never reaches the static mount as `..`. Driving the ASGI app by
    hand is how a raw client (curl, a browser proxy, a hostile socket) reaches it.
    """
    scope: dict[str, Any] = {
        "type": "http",
        "asgi": {"version": "3.0", "spec_version": "2.3"},
        "http_version": "1.1",
        "method": "GET",
        "scheme": "http",
        "path": target,
        "raw_path": target.encode("ascii"),
        "query_string": b"",
        "root_path": "",
        "headers": [(b"host", b"testserver"), (b"accept", b"*/*")],
        "client": ("127.0.0.1", 54321),
        "server": ("testserver", 80),
    }
    sent: list[Message] = []

    async def receive() -> dict[str, Any]:
        return {"type": "http.request", "body": b"", "more_body": False}

    async def send(message: Message) -> None:
        sent.append(message)

    await application(scope, receive, send)
    start = next(message for message in sent if message["type"] == "http.response.start")
    body = b"".join(
        message.get("body", b"") for message in sent if message["type"] == "http.response.body"
    )
    return int(start["status"]), body


# ----------------------------------------------------------------------------- /healthz


def test_healthz_is_ok_with_the_expected_shape(client: TestClient) -> None:
    response = client.get("/healthz")
    assert response.status_code == 200
    assert response.headers["content-type"].startswith("application/json")
    assert response.json() == {"status": "ok", "version": __version__, "rooms": 0}


# ----------------------------------------------------------------------------- client shell


def test_root_serves_the_shell_html(client: TestClient) -> None:
    response = client.get("/")
    assert response.status_code == 200
    assert response.headers["content-type"].startswith("text/html")
    assert int(response.headers["content-length"]) > 500  # streamed from the file
    html = response.text
    assert 'src="/static/js/app.js"' in html
    assert 'href="/static/css/base.css"' in html
    assert 'id="screen-lobby"' in html
    assert 'aria-live="polite"' in html
    assert (
        'name="viewport" content="width=device-width,initial-scale=1,viewport-fit=cover"' in html
    )


def test_shell_offers_the_lobby_controls(client: TestClient) -> None:
    html = client.get("/").text
    assert 'id="create-lobby"' in html
    assert 'id="join-form"' in html
    assert 'id="join-code"' in html
    assert 'inputmode="text"' in html
    assert 'autocapitalize="characters"' in html
    assert 'size="5"' in html  # five characters wide: no 20-char intrinsic box
    assert 'maxlength="5"' in html
    assert 'for="join-code"' in html  # the code input has a real label


def test_static_css_and_js_are_served_with_real_mime_types(client: TestClient) -> None:
    css = client.get("/static/css/base.css")
    assert css.status_code == 200
    assert css.headers["content-type"].startswith("text/css")
    assert "--uc-hit: 44px" in css.text  # the 44px hit-target contract lives in CSS

    script = client.get("/static/js/app.js")
    assert script.status_code == 200
    assert script.headers["content-type"].startswith("text/javascript")
    assert "uc.token" in script.text


def test_unknown_path_is_404(client: TestClient) -> None:
    assert client.get("/definitely-not-a-route").status_code == 404


@pytest.mark.parametrize("path", ROUTE_KINDS)
def test_every_response_carries_the_security_headers(client: TestClient, path: str) -> None:
    response = client.get(path)
    for header, value in SECURITY_HEADERS.items():
        assert response.headers[header] == value, f"{path} is missing {header}"


# ----------------------------------------------------------------------------- traversal


@pytest.mark.parametrize(
    "path",
    [
        "/static/%2e%2e/pyproject.toml",  # encoded ".."
        "/static/%2e%2e%2fpyproject.toml",  # encoded "../"
        "/static/./../../pyproject.toml",
        "/static/README.md",
        "/static/.env",
    ],
)
def test_static_mount_cannot_escape_its_directory(client: TestClient, path: str) -> None:
    response = client.get(path)
    assert response.status_code in (400, 404)
    assert "requires-python" not in response.text


@pytest.mark.parametrize(
    "target",
    [
        "/static/../pyproject.toml",  # what a raw client sends: no normalization
        "/static/../../../etc/passwd",
        "/static/%2e%2e/%2e%2e/pyproject.toml",
    ],
)
async def test_asgi_layer_refuses_a_literal_traversal(target: str) -> None:
    status, body = await _asgi_get(create_app(Settings()), target)
    assert status in (400, 404)
    assert b"requires-python" not in body
    assert b"root:" not in body


# ----------------------------------------------------------------------------- settings wiring


def test_app_state_holds_the_settings_it_was_built_with() -> None:
    settings = Settings(max_players=2, port=8137, tick_hz=30, snapshot_hz=30)
    application = create_app(settings)
    assert application.state.settings is settings


def test_overridden_settings_are_visible_through_a_live_request(
    make_settings: Callable[..., Settings],
) -> None:
    application = create_app(make_settings(max_players=1, max_rooms=3))
    with TestClient(application) as test_client:
        assert test_client.get("/healthz").status_code == 200
    assert application.state.settings.max_players == 1
    assert application.state.settings.max_rooms == 3


def test_static_dir_override_is_served(tmp_path: Path) -> None:
    (tmp_path / "probe.txt").write_text("from the override", encoding="utf-8")
    settings = Settings(static_dir=tmp_path)
    assert resolve_static_dir(settings) == tmp_path
    with TestClient(create_app(settings)) as test_client:
        assert test_client.get("/static/probe.txt").text == "from the override"


def test_default_static_dir_is_the_repository_shell() -> None:
    assert STATIC_DIR == REPO_ROOT / "app" / "static"
    assert resolve_static_dir(Settings()) == STATIC_DIR
    assert (STATIC_DIR / "index.html").is_file()


def test_missing_static_directory_fails_at_startup(tmp_path: Path) -> None:
    with pytest.raises(ConfigError, match=r"static directory .* does not exist"):
        create_app(Settings(static_dir=tmp_path / "nope"))


# ----------------------------------------------------------------------------- startup hook


def test_startup_logs_the_resolved_settings_once(caplog: pytest.LogCaptureFixture) -> None:
    with (
        caplog.at_level(logging.INFO, logger=APP_LOGGER),
        TestClient(create_app(Settings())) as test_client,
    ):
        assert test_client.get("/healthz").status_code == 200
        assert caplog.text.count("starting") == 1
    assert "port=8000" in caplog.text
    assert "tick_hz=20" in caplog.text
    assert "stopped" in caplog.text  # the shutdown half of the lifespan


def test_startup_log_never_dumps_the_environment(
    monkeypatch: pytest.MonkeyPatch, caplog: pytest.LogCaptureFixture
) -> None:
    """The hook logs resolved *values*, never variable names or a `.env` file."""
    monkeypatch.delenv("UNDERCOOKED_PORT", raising=False)
    monkeypatch.setenv("UNDERCOOKED_SIM_LATENCY_MS", "5")
    reset_settings_cache()
    # settings straight from the environment, exactly as `uv run undercooked` does
    with caplog.at_level(logging.INFO, logger=APP_LOGGER), TestClient(create_app()):
        pass
    text = caplog.text
    assert "port=8000" in text
    assert "sim_latency_ms=5" in text
    assert not any(name in text for name in ENV_KEYS.values())
    assert ".env" not in text


def test_settings_log_line_is_a_fixed_vocabulary_summary() -> None:
    line = settings_log_line(Settings())
    assert line == (
        "host=127.0.0.1 port=8000 tick_hz=20 snapshot_hz=20 max_players=4 max_rooms=200 "
        "levels_dir=levels lobby_idle_timeout_s=900.0 guest_idle_timeout_s=45.0 "
        "max_message_bytes=4096 max_inputs_per_s=40 sim_latency_ms=0 "
        "allowed_origins=() debugpy=False"
    )
    names = {field.name for field in dataclasses.fields(Settings)}
    assert set(LOGGED_SETTINGS) <= names


def test_startup_hook_passes_the_app_settings_to_the_debugpy_bootstrap(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    calls: list[Settings] = []
    monkeypatch.setattr(
        app_module, "maybe_start_debugpy", lambda settings: calls.append(settings) or False
    )
    settings = Settings(debugpy=True, debugpy_port=5999)
    with TestClient(create_app(settings)):
        pass
    assert calls == [settings]


def test_booting_the_app_with_debugpy_disabled_never_imports_it(
    monkeypatch: pytest.MonkeyPatch, caplog: pytest.LogCaptureFixture
) -> None:
    """A `None` entry makes any real `import debugpy` raise, so a stray listener
    would fail loudly instead of binding a port during the suite."""
    monkeypatch.setitem(sys.modules, "debugpy", None)
    with caplog.at_level(logging.DEBUG, logger="undercooked.debug"), TestClient(
        create_app(Settings())
    ):
        pass
    assert caplog.records == []


# ----------------------------------------------------------------------------- module `app`


def test_module_level_app_is_lazy_and_cached() -> None:
    module = importlib.import_module("undercooked.server.app")
    assert module.app is module.app  # built once, then cached
    assert isinstance(module.app, FastAPI)
    assert get_app() is module.app


def test_unknown_module_attribute_raises() -> None:
    with pytest.raises(AttributeError, match="has no attribute"):
        _ = app_module.not_a_real_attribute


def test_docs_endpoints_are_disabled_because_they_load_a_cdn() -> None:
    """A12: FastAPI renders /docs and /redoc with assets from a public CDN."""
    with TestClient(create_app(Settings())) as test_client:
        for path in ("/docs", "/redoc", "/openapi.json"):
            assert test_client.get(path).status_code == 404