"""Tests for the transport runners: fail-closed startup, uvicorn wiring, stdio, serve CLI."""

from __future__ import annotations

import json
import sys
from pathlib import Path
from typing import Any

import pytest
from mcp import Client
from mcp.client.stdio import StdioServerParameters, stdio_client

from aegis_gitea_mcp import cli, transports
from aegis_gitea_mcp.cli import main
from aegis_gitea_mcp.config import Settings
from aegis_gitea_mcp.oauth import OAuthSetupError
from aegis_gitea_mcp.transports import (
    ForwardedHeadersMiddleware,
    HttpAuthExtras,
    http_startup_errors,
    load_oauth_components,
    run_http,
    run_stdio,
)
from tests.test_server_helpers import ANY_HOST, BEARER_TOKEN, GITEA_TOKEN, server_settings


@pytest.fixture(autouse=True)
def _env(mock_env: None) -> None:
    """Settings objects here are built explicitly; the audit logger still needs GITEA_URL."""


class UvicornSpy:
    """Replaces ``uvicorn.run`` and records its arguments."""

    def __init__(self) -> None:
        self.calls: list[tuple[Any, dict[str, Any]]] = []

    def __call__(self, app: Any, **kwargs: Any) -> None:
        self.calls.append((app, kwargs))


@pytest.fixture
def uvicorn_spy(monkeypatch: pytest.MonkeyPatch) -> UvicornSpy:
    spy = UvicornSpy()
    monkeypatch.setattr(transports.uvicorn, "run", spy)
    return spy


def oauth_settings(**overrides: Any) -> Settings:
    values: dict[str, Any] = {
        "oauth_enabled": True,
        "gitea_oauth_client_id": "client",
        "gitea_oauth_client_secret": "s" * 32,
        "token_encryption_key": "k" * 32,
        "public_base_url": "https://mcp.example.com",
    }
    values.update(overrides)
    return server_settings(**values)


# HTTP startup checks


def test_non_loopback_bind_without_auth_is_refused(
    uvicorn_spy: UvicornSpy, capsys: pytest.CaptureFixture[str]
) -> None:
    assert run_http(server_settings(mcp_host=ANY_HOST)) == 2

    captured = capsys.readouterr()
    assert uvicorn_spy.calls == []
    assert "without HTTP authentication" in captured.err
    assert "MCP_BEARER_TOKEN" in captured.err
    assert captured.out == ""


def test_non_loopback_bind_with_bearer_is_allowed(uvicorn_spy: UvicornSpy) -> None:
    settings = server_settings(mcp_host=ANY_HOST, mcp_port=9000, mcp_bearer_token=BEARER_TOKEN)

    assert run_http(settings) == 0

    ((app, kwargs),) = uvicorn_spy.calls
    assert callable(app)
    assert kwargs["host"] == ANY_HOST
    assert kwargs["port"] == 9000
    # Proxy headers are applied by ForwardedHeadersMiddleware, not by uvicorn.
    assert kwargs["proxy_headers"] is False
    assert isinstance(app, ForwardedHeadersMiddleware)
    assert app.trusted == "127.0.0.1"
    assert kwargs["log_level"] == "info"
    assert kwargs["server_header"] is False


def test_loopback_without_auth_runs(uvicorn_spy: UvicornSpy) -> None:
    assert run_http(server_settings(log_level="DEBUG")) == 0

    assert uvicorn_spy.calls[0][1]["host"] == "127.0.0.1"
    assert uvicorn_spy.calls[0][1]["log_level"] == "debug"


def test_forwarded_allow_ips_setting_is_passed_to_uvicorn(uvicorn_spy: UvicornSpy) -> None:
    assert run_http(server_settings(forwarded_allow_ips="10.0.0.0/8, 172.18.0.2")) == 0

    assert uvicorn_spy.calls[0][0].trusted == "10.0.0.0/8,172.18.0.2"


def test_forwarded_allow_ips_wildcard_needs_an_explicit_value_and_warns(
    uvicorn_spy: UvicornSpy, capsys: pytest.CaptureFixture[str]
) -> None:
    assert server_settings().forwarded_allow_ips == "127.0.0.1"

    assert run_http(server_settings(forwarded_allow_ips="*")) == 0

    assert uvicorn_spy.calls[0][0].trusted == "*"
    assert "FORWARDED_ALLOW_IPS=*" in capsys.readouterr().err


def test_non_loopback_bind_without_public_host_warns_which_variables_to_set(
    uvicorn_spy: UvicornSpy, capsys: pytest.CaptureFixture[str]
) -> None:
    assert run_http(server_settings(mcp_host=ANY_HOST, mcp_bearer_token=BEARER_TOKEN)) == 0

    err = capsys.readouterr().err
    assert "PUBLIC_BASE_URL" in err and "ALLOWED_HOSTS" in err and "421" in err


@pytest.mark.parametrize(
    "extra",
    [{"public_base_url": "https://mcp.example.com"}, {"allowed_hosts": ["mcp.example.com"]}],
)
def test_no_host_warning_when_a_public_host_is_configured(
    uvicorn_spy: UvicornSpy, capsys: pytest.CaptureFixture[str], extra: dict[str, Any]
) -> None:
    settings = server_settings(mcp_host=ANY_HOST, mcp_bearer_token=BEARER_TOKEN, **extra)

    assert run_http(settings) == 0

    assert "421" not in capsys.readouterr().err


def test_no_host_warning_on_loopback(
    uvicorn_spy: UvicornSpy, capsys: pytest.CaptureFixture[str]
) -> None:
    assert run_http(server_settings()) == 0

    assert capsys.readouterr().err == ""


def test_oauth_enabled_with_a_bearer_starts_without_warnings(
    uvicorn_spy: UvicornSpy, capsys: pytest.CaptureFixture[str]
) -> None:
    assert run_http(oauth_settings(mcp_bearer_token=BEARER_TOKEN)) == 0

    assert capsys.readouterr().err == ""


@pytest.mark.parametrize("value", ["*,10.0.0.1", "not-an-ip", "10.0.0.1/99"])
def test_invalid_forwarded_allow_ips_is_rejected(value: str) -> None:
    with pytest.raises(ValueError, match="FORWARDED_ALLOW_IPS"):
        server_settings(forwarded_allow_ips=value)


def test_blank_forwarded_allow_ips_means_the_default() -> None:
    assert server_settings(forwarded_allow_ips="  ").forwarded_allow_ips == "127.0.0.1"


# Audit log at startup


@pytest.fixture
def unwritable_audit(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> Path:
    """An audit path whose parent is a regular file, so it can never be opened."""
    blocker = tmp_path / "blocker"
    blocker.write_text("x", encoding="utf-8")
    path = blocker / "audit.log"
    monkeypatch.setenv("AUDIT_LOG_PATH", str(path))
    return path


def test_http_exits_2_when_the_audit_log_cannot_be_opened(
    uvicorn_spy: UvicornSpy, unwritable_audit: Path, capsys: pytest.CaptureFixture[str]
) -> None:
    assert run_http(server_settings(audit_log_path=unwritable_audit)) == 2

    captured = capsys.readouterr()
    assert uvicorn_spy.calls == []
    assert "audit log" in captured.err and "AUDIT_LOG_PATH" in captured.err
    assert str(unwritable_audit) in captured.err
    assert captured.out == ""


def test_stdio_exits_2_when_the_audit_log_cannot_be_opened(
    unwritable_audit: Path, monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]
) -> None:
    monkeypatch.setattr(transports.anyio, "run", lambda *a: pytest.fail("must not serve"))

    assert run_stdio(server_settings(audit_log_path=unwritable_audit)) == 2

    captured = capsys.readouterr()
    assert "AUDIT_LOG_PATH" in captured.err
    assert captured.out == ""


def test_oauth_misconfiguration_lists_every_missing_setting(
    uvicorn_spy: UvicornSpy, capsys: pytest.CaptureFixture[str]
) -> None:
    settings = server_settings(oauth_enabled=True, mcp_bearer_token=BEARER_TOKEN)

    assert run_http(settings) == 2

    err = capsys.readouterr().err
    for name in (
        "GITEA_OAUTH_CLIENT_ID",
        "GITEA_OAUTH_CLIENT_SECRET",
        "TOKEN_ENCRYPTION_KEY",
        "PUBLIC_BASE_URL",
    ):
        assert name in err
    assert uvicorn_spy.calls == []


def test_oauth_enabled_but_unavailable_does_not_start(
    uvicorn_spy: UvicornSpy, capsys: pytest.CaptureFixture[str], monkeypatch: pytest.MonkeyPatch
) -> None:
    def broken(settings: Settings) -> HttpAuthExtras:
        raise OAuthSetupError("token store unreadable")

    monkeypatch.setattr(transports, "load_oauth_components", broken)

    assert run_http(oauth_settings(mcp_bearer_token=BEARER_TOKEN)) == 2

    assert "per-user OAuth cannot start: token store unreadable" in capsys.readouterr().err
    assert uvicorn_spy.calls == []


def test_oauth_enabled_with_a_bearer_serves_both(uvicorn_spy: UvicornSpy) -> None:
    assert run_http(oauth_settings(mcp_bearer_token=BEARER_TOKEN)) == 0
    assert len(uvicorn_spy.calls) == 1


def test_oauth_components_are_used_when_available(
    uvicorn_spy: UvicornSpy, monkeypatch: pytest.MonkeyPatch
) -> None:
    class Verifier:
        async def verify_token(self, token: str) -> None:
            return None

    extras = HttpAuthExtras(token_verifier=Verifier())
    monkeypatch.setattr(transports, "load_oauth_components", lambda settings: extras)
    settings = oauth_settings(mcp_host=ANY_HOST, gitea_token=None)

    assert run_http(settings) == 0
    assert len(uvicorn_spy.calls) == 1


def test_default_oauth_components_hook_builds_the_oauth_components() -> None:
    extras = load_oauth_components(oauth_settings())

    assert extras.auth_server_provider is not None
    assert extras.token_verifier is not None and extras.resolver is not None


def test_startup_errors_without_oauth_components() -> None:
    errors = http_startup_errors(oauth_settings(mcp_bearer_token=BEARER_TOKEN), None)

    assert errors == ["OAUTH_ENABLED=true but per-user OAuth could not be set up"]


def test_bearer_without_gitea_token_is_refused(
    uvicorn_spy: UvicornSpy, capsys: pytest.CaptureFixture[str]
) -> None:
    assert run_http(server_settings(mcp_bearer_token=BEARER_TOKEN, gitea_token=None)) == 2

    assert "GITEA_TOKEN" in capsys.readouterr().err


def test_http_startup_errors_is_empty_for_a_valid_setup() -> None:
    assert http_startup_errors(server_settings(mcp_bearer_token=BEARER_TOKEN), None) == []


def test_bad_disabled_tools_stop_http_startup(
    uvicorn_spy: UvicornSpy, capsys: pytest.CaptureFixture[str]
) -> None:
    assert run_http(server_settings(disabled_tools=["gitea_nope"])) == 2

    assert "gitea_nope" in capsys.readouterr().err
    assert uvicorn_spy.calls == []


# stdio


def test_stdio_without_a_token_exits_2(capsys: pytest.CaptureFixture[str]) -> None:
    assert run_stdio(server_settings(gitea_token=None)) == 2

    captured = capsys.readouterr()
    assert "GITEA_TOKEN" in captured.err
    assert captured.out == ""


def test_stdio_with_bad_disabled_tools_exits_2(capsys: pytest.CaptureFixture[str]) -> None:
    assert run_stdio(server_settings(disabled_tools=["nope"])) == 2

    assert "nope" in capsys.readouterr().err


def test_stdio_serves_the_built_server(monkeypatch: pytest.MonkeyPatch) -> None:
    served: list[Any] = []

    def fake_run(function: Any, server: Any) -> None:
        served.append((function, server))

    monkeypatch.setattr(transports.anyio, "run", fake_run)

    assert run_stdio(server_settings()) == 0

    function, server = served[0]
    assert function is transports._serve_stdio
    assert server.tool_count == 538


async def test_real_stdio_subprocess_serves_the_catalog(tmp_path: Path) -> None:
    env = {
        "GITEA_URL": "http://127.0.0.1:9",
        "GITEA_TOKEN": GITEA_TOKEN,
        "DATA_DIR": str(tmp_path / "state"),
        "AUDIT_LOG_PATH": str(tmp_path / "state" / "audit.log"),
        "REQUEST_TIMEOUT_SECONDS": "2",
    }
    params = StdioServerParameters(
        command=sys.executable,
        args=["-m", "aegis_gitea_mcp.cli", "serve", "--transport", "stdio"],
        env=env,
        cwd=str(tmp_path),
    )
    async with Client(stdio_client(params)) as client:
        tools = (await client.list_tools()).tools
        result = await client.call_tool("gitea_repo_get", {"owner": "o", "repo": "r"})

    assert len(tools) == 538
    # Gitea is unreachable: the call fails as an error result, stdout stayed valid JSON-RPC.
    assert result.is_error
    payload = json.loads(result.content[0].text)  # type: ignore[union-attr]
    assert "error" in payload and GITEA_TOKEN not in json.dumps(payload)
    audit = (tmp_path / "state" / "audit.log").read_text(encoding="utf-8").splitlines()
    events = [json.loads(line)["event_type"] for line in audit]
    # A write-ahead entry, then the one tool_invocation entry with the result.
    assert events == ["tool_call_started", "tool_invocation"]
    assert all(GITEA_TOKEN not in line for line in audit)


# serve command


def test_serve_command_applies_flags_and_runs_http(monkeypatch: pytest.MonkeyPatch) -> None:
    # Set first so monkeypatch restores whatever ``serve`` writes into the environment.
    monkeypatch.setenv("MCP_TRANSPORT", "stdio")
    monkeypatch.setenv("MCP_HOST", "127.0.0.1")
    monkeypatch.setenv("MCP_PORT", "8080")
    seen: list[Settings] = []
    monkeypatch.setattr(transports, "run_http", lambda settings: seen.append(settings) or 0)
    monkeypatch.setattr(transports, "run_stdio", lambda settings: pytest.fail("wrong transport"))

    code = main(["serve", "--transport", "http", "--host", "127.0.0.2", "--port", "9123"])

    assert code == 0
    assert (seen[0].mcp_transport, seen[0].mcp_host, seen[0].mcp_port) == (
        "http",
        "127.0.0.2",
        9123,
    )


def test_serve_defaults_to_the_configured_transport(monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.setenv("MCP_TRANSPORT", "http")
    seen: list[str] = []
    monkeypatch.setattr(transports, "run_http", lambda settings: seen.append("http") or 0)
    monkeypatch.setattr(transports, "run_stdio", lambda settings: seen.append("stdio") or 0)

    assert main([]) == 0
    assert seen == ["http"]


def test_serve_defaults_to_stdio(monkeypatch: pytest.MonkeyPatch) -> None:
    seen: list[str] = []
    monkeypatch.setattr(transports, "run_stdio", lambda settings: seen.append("stdio") or 0)

    assert main(["serve"]) == 0
    assert seen == ["stdio"]


def test_serve_with_invalid_configuration_never_echoes_values(
    monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]
) -> None:
    monkeypatch.setenv("MCP_BEARER_TOKEN", "too-short-secret-VALUE")
    monkeypatch.setattr(transports, "run_stdio", lambda settings: pytest.fail("must not run"))

    assert main(["serve"]) == 2

    captured = capsys.readouterr()
    assert "MCP_BEARER_TOKEN" in captured.err
    assert "too-short-secret-VALUE" not in captured.err + captured.out


def test_serve_without_gitea_url_exits_2(
    monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]
) -> None:
    monkeypatch.delenv("GITEA_URL")

    assert main(["serve"]) == 2

    assert "GITEA_URL" in capsys.readouterr().err


def test_serve_rejects_an_out_of_range_port() -> None:
    with pytest.raises(SystemExit):
        cli.build_parser().parse_args(["serve", "--port", "70000"])


async def test_serve_stdio_runs_the_server_over_the_stdio_streams(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    """``_serve_stdio`` hands the stdio streams to the server (streams replaced by memory)."""
    from contextlib import asynccontextmanager

    import anyio
    from mcp.client.session import ClientSession
    from mcp.shared.memory import create_client_server_memory_streams

    from aegis_gitea_mcp.server import build_server

    async with create_client_server_memory_streams() as (client_streams, server_streams):

        @asynccontextmanager
        async def fake_stdio() -> Any:
            yield server_streams

        monkeypatch.setattr(transports, "stdio_server", fake_stdio)
        server = build_server(server_settings())
        async with anyio.create_task_group() as group:
            group.start_soon(transports._serve_stdio, server)
            async with ClientSession(*client_streams) as session:
                await session.initialize()
                tools = await session.list_tools()
            group.cancel_scope.cancel()

    assert len(tools.tools) == 538