"""Tests for the `hermes proxy` subcommand and its upstream adapters."""

from __future__ import annotations

import asyncio
import json
import os
import threading
from pathlib import Path
from typing import Any, Dict
from unittest.mock import MagicMock, patch

import pytest

from hermes_cli.proxy.adapters import ADAPTERS, get_adapter
from hermes_cli.proxy.adapters.base import UpstreamAdapter, UpstreamCredential
from hermes_cli.proxy.adapters.nous_portal import NousPortalAdapter


# ---------------------------------------------------------------------------
# Adapter registry
# ---------------------------------------------------------------------------


def test_registry_lists_nous():
    assert "nous" in ADAPTERS


def test_get_adapter_returns_instance():
    adapter = get_adapter("nous")
    assert isinstance(adapter, NousPortalAdapter)
    assert isinstance(adapter, UpstreamAdapter)


def test_get_adapter_case_insensitive():
    assert isinstance(get_adapter("NOUS"), NousPortalAdapter)
    assert isinstance(get_adapter("  Nous  "), NousPortalAdapter)


def test_get_adapter_unknown_provider_raises():
    with pytest.raises(ValueError, match="anthropic"):
        get_adapter("anthropic")  # not yet implemented


# ---------------------------------------------------------------------------
# NousPortalAdapter
# ---------------------------------------------------------------------------


def _write_auth_store(hermes_home: Path, nous_state: Dict[str, Any]) -> Path:
    """Write an auth.json with the given nous state into a hermetic HERMES_HOME."""
    auth_path = hermes_home / "auth.json"
    auth_path.write_text(json.dumps({
        "version": 1,
        "providers": {"nous": nous_state},
    }))
    return auth_path


def test_nous_adapter_metadata():
    adapter = NousPortalAdapter()
    assert adapter.name == "nous"
    assert adapter.display_name == "Nous Portal"
    assert "/chat/completions" in adapter.allowed_paths
    assert "/embeddings" in adapter.allowed_paths
    assert "/completions" in adapter.allowed_paths
    assert "/models" in adapter.allowed_paths


def test_nous_adapter_not_authenticated_when_no_auth_file(tmp_path, monkeypatch):
    # HERMES_HOME is already set by conftest, but make doubly sure
    monkeypatch.setenv("HERMES_HOME", str(tmp_path))
    adapter = NousPortalAdapter()
    assert not adapter.is_authenticated()


def test_nous_adapter_not_authenticated_when_provider_missing(tmp_path, monkeypatch):
    monkeypatch.setenv("HERMES_HOME", str(tmp_path))
    (tmp_path / "auth.json").write_text(json.dumps({
        "version": 1,
        "providers": {},
    }))
    assert not NousPortalAdapter().is_authenticated()


def test_nous_adapter_authenticated_with_agent_key(tmp_path, monkeypatch):
    monkeypatch.setenv("HERMES_HOME", str(tmp_path))
    _write_auth_store(tmp_path, {
        "agent_key": "ov-test-key",
        "agent_key_expires_at": "2099-01-01T00:00:00Z",
        "inference_base_url": "https://inference-api.nousresearch.com/v1",
    })
    assert NousPortalAdapter().is_authenticated()


def test_nous_adapter_authenticated_with_refresh_token_only(tmp_path, monkeypatch):
    """If access_token+refresh_token exist but no agent_key yet, we can still mint."""
    monkeypatch.setenv("HERMES_HOME", str(tmp_path))
    _write_auth_store(tmp_path, {
        "access_token": "access-tok",
        "refresh_token": "refresh-tok",
    })
    assert NousPortalAdapter().is_authenticated()


def test_nous_adapter_get_credential_refreshes_and_persists(tmp_path, monkeypatch):
    monkeypatch.setenv("HERMES_HOME", str(tmp_path))
    _write_auth_store(tmp_path, {
        "access_token": "access-tok",
        "refresh_token": "refresh-tok",
        "client_id": "hermes-cli",
        "portal_base_url": "https://portal.nousresearch.com",
        "inference_base_url": "https://inference-api.nousresearch.com/v1",
    })

    refreshed_state = {
        "access_token": "access-tok",
        "refresh_token": "refresh-tok",
        "client_id": "hermes-cli",
        "portal_base_url": "https://portal.nousresearch.com",
        "inference_base_url": "https://inference-api.nousresearch.com/v1",
        "agent_key": "minted-bearer",
        "agent_key_expires_at": "2099-01-01T00:00:00Z",
    }

    with patch(
        "hermes_cli.proxy.adapters.nous_portal.refresh_nous_oauth_from_state",
        return_value=refreshed_state,
    ) as mock_refresh:
        adapter = NousPortalAdapter()
        cred = adapter.get_credential()

    mock_refresh.assert_called_once()
    assert cred.bearer == "minted-bearer"
    assert cred.base_url == "https://inference-api.nousresearch.com/v1"
    assert cred.expires_at == "2099-01-01T00:00:00Z"
    assert cred.token_type == "Bearer"

    # Verify state was persisted back
    stored = json.loads((tmp_path / "auth.json").read_text())
    assert stored["providers"]["nous"]["agent_key"] == "minted-bearer"


def test_nous_adapter_get_credential_raises_when_not_logged_in(tmp_path, monkeypatch):
    monkeypatch.setenv("HERMES_HOME", str(tmp_path))
    adapter = NousPortalAdapter()
    with pytest.raises(RuntimeError, match="hermes login nous"):
        adapter.get_credential()


def test_nous_adapter_get_credential_raises_on_refresh_failure(tmp_path, monkeypatch):
    monkeypatch.setenv("HERMES_HOME", str(tmp_path))
    _write_auth_store(tmp_path, {
        "access_token": "access-tok",
        "refresh_token": "refresh-tok",
    })

    with patch(
        "hermes_cli.proxy.adapters.nous_portal.refresh_nous_oauth_from_state",
        side_effect=RuntimeError("Refresh session has been revoked"),
    ):
        adapter = NousPortalAdapter()
        with pytest.raises(RuntimeError, match="Refresh session has been revoked"):
            adapter.get_credential()


def test_nous_adapter_get_credential_raises_when_no_agent_key_returned(tmp_path, monkeypatch):
    """If the refresh helper succeeds but produces no agent_key, we surface a clear error."""
    monkeypatch.setenv("HERMES_HOME", str(tmp_path))
    _write_auth_store(tmp_path, {
        "access_token": "access-tok",
        "refresh_token": "refresh-tok",
    })

    with patch(
        "hermes_cli.proxy.adapters.nous_portal.refresh_nous_oauth_from_state",
        return_value={"access_token": "a", "refresh_token": "r"},
    ):
        adapter = NousPortalAdapter()
        with pytest.raises(RuntimeError, match="did not return a usable agent_key"):
            adapter.get_credential()


def test_nous_adapter_concurrent_refresh_serialized(tmp_path, monkeypatch):
    """Two parallel get_credential() calls must serialize through the lock."""
    monkeypatch.setenv("HERMES_HOME", str(tmp_path))
    _write_auth_store(tmp_path, {
        "access_token": "a", "refresh_token": "r",
    })

    call_log: list = []
    in_flight = threading.Event()
    overlap_detected = threading.Event()
    counter = [0]
    counter_lock = threading.Lock()

    def serializing_refresh(state, **kwargs):
        # If another thread is already inside refresh, the lock is broken.
        if in_flight.is_set():
            overlap_detected.set()
        in_flight.set()
        try:
            call_log.append(threading.current_thread().ident)
            # Simulate refresh latency so any race window is exposed.
            import time
            time.sleep(0.05)
            with counter_lock:
                counter[0] += 1
                idx = counter[0]
            return {
                **state,
                "agent_key": f"key-{idx}",
                "agent_key_expires_at": "2099-01-01T00:00:00Z",
                "inference_base_url": "https://inference-api.nousresearch.com/v1",
            }
        finally:
            in_flight.clear()

    adapter = NousPortalAdapter()
    results: list = []
    errors: list = []

    def worker():
        try:
            results.append(adapter.get_credential().bearer)
        except Exception as exc:  # pragma: no cover - shouldn't happen
            errors.append(exc)

    with patch(
        "hermes_cli.proxy.adapters.nous_portal.refresh_nous_oauth_from_state",
        side_effect=serializing_refresh,
    ):
        threads = [threading.Thread(target=worker) for _ in range(3)]
        for t in threads:
            t.start()
        for t in threads:
            t.join()

    assert not errors, f"workers errored: {errors}"
    assert len(results) == 3
    assert len(call_log) == 3
    assert not overlap_detected.is_set(), "refresh calls overlapped — lock is broken"
    assert all(r.startswith("key-") for r in results)


# ---------------------------------------------------------------------------
# Server: path filtering + forwarding
#
# We run the proxy AND a fake upstream as real aiohttp servers on ephemeral
# ports. Avoids pytest-aiohttp's fixtures (extra dependency for one test file).
# ---------------------------------------------------------------------------

aiohttp = pytest.importorskip("aiohttp")
from aiohttp import web  # noqa: E402

from hermes_cli.proxy.server import create_app  # noqa: E402


class FakeAdapter(UpstreamAdapter):
    """A test adapter that returns a fixed credential without touching disk."""

    def __init__(self, base_url: str, bearer: str = "test-bearer",
                 allowed=None, raise_on_credential=False):
        self._base_url = base_url
        self._bearer = bearer
        self._allowed = frozenset(allowed or ["/chat/completions"])
        self._raise = raise_on_credential
        self.calls = 0

    @property
    def name(self): return "fake"

    @property
    def display_name(self): return "Fake Provider"

    @property
    def allowed_paths(self): return self._allowed

    def is_authenticated(self): return True

    def get_credential(self):
        self.calls += 1
        if self._raise:
            raise RuntimeError("simulated auth failure")
        return UpstreamCredential(
            bearer=self._bearer, base_url=self._base_url,
            expires_at="2099-01-01T00:00:00Z",
        )


async def _start_runner(app: "web.Application"):
    """Spin up an aiohttp app on an ephemeral localhost port. Returns (runner, base_url)."""
    runner = web.AppRunner(app, access_log=None)
    await runner.setup()
    site = web.TCPSite(runner, host="127.0.0.1", port=0)
    await site.start()
    sockets = list(site._server.sockets)  # type: ignore[union-attr]
    port = sockets[0].getsockname()[1]
    return runner, f"http://127.0.0.1:{port}"


def _build_fake_upstream(captured: Dict[str, Any]) -> "web.Application":
    async def echo(request):
        body = await request.read()
        captured["requests"].append({
            "method": request.method,
            "path": request.path,
            "auth": request.headers.get("Authorization"),
            "body": body.decode("utf-8") if body else "",
        })
        return web.json_response({"echoed": True, "path": request.path})

    async def sse(request):
        resp = web.StreamResponse(
            status=200, headers={"Content-Type": "text/event-stream"},
        )
        await resp.prepare(request)
        for chunk in [b"data: hello\n\n", b"data: world\n\n", b"data: [DONE]\n\n"]:
            await resp.write(chunk)
        await resp.write_eof()
        return resp

    app = web.Application()
    app.router.add_route("*", "/v1/chat/completions", echo)
    app.router.add_route("*", "/v1/embeddings", echo)
    app.router.add_route("*", "/v1/sse", sse)
    return app


def test_server_forwards_chat_completions():
    async def run():
        captured: Dict[str, Any] = {"requests": []}
        upstream_runner, upstream_base = await _start_runner(_build_fake_upstream(captured))
        adapter = FakeAdapter(f"{upstream_base}/v1", bearer="real-portal-key")
        proxy_runner, proxy_base = await _start_runner(create_app(adapter))

        try:
            async with aiohttp.ClientSession() as session:
                async with session.post(
                    f"{proxy_base}/v1/chat/completions",
                    json={"model": "Hermes-4-70B",
                          "messages": [{"role": "user", "content": "hi"}]},
                    headers={"Authorization": "Bearer client-dummy-key"},
                ) as resp:
                    assert resp.status == 200
                    data = await resp.json()
                    assert data["echoed"] is True

            assert len(captured["requests"]) == 1
            req = captured["requests"][0]
            assert req["auth"] == "Bearer real-portal-key"
            assert "Hermes-4-70B" in req["body"]
        finally:
            await proxy_runner.cleanup()
            await upstream_runner.cleanup()

    asyncio.run(run())


def test_server_rejects_disallowed_path():
    async def run():
        adapter = FakeAdapter("http://unused.example/v1", allowed=["/chat/completions"])
        runner, base = await _start_runner(create_app(adapter))
        try:
            async with aiohttp.ClientSession() as session:
                async with session.get(f"{base}/v1/random/endpoint") as resp:
                    assert resp.status == 404
                    body = await resp.json()
                    assert body["error"]["type"] == "path_not_allowed"
                    assert "/chat/completions" in body["error"]["message"]
        finally:
            await runner.cleanup()

    asyncio.run(run())


def test_server_returns_401_when_adapter_fails():
    async def run():
        adapter = FakeAdapter("http://unused.example/v1", raise_on_credential=True)
        runner, base = await _start_runner(create_app(adapter))
        try:
            async with aiohttp.ClientSession() as session:
                async with session.post(f"{base}/v1/chat/completions", json={}) as resp:
                    assert resp.status == 401
                    body = await resp.json()
                    assert body["error"]["type"] == "upstream_auth_failed"
                    assert "simulated auth failure" in body["error"]["message"]
        finally:
            await runner.cleanup()

    asyncio.run(run())


def test_server_health_endpoint():
    async def run():
        adapter = FakeAdapter("http://unused.example/v1")
        runner, base = await _start_runner(create_app(adapter))
        try:
            async with aiohttp.ClientSession() as session:
                async with session.get(f"{base}/health") as resp:
                    assert resp.status == 200
                    body = await resp.json()
                    assert body["status"] == "ok"
                    assert body["upstream"] == "Fake Provider"
                    assert body["authenticated"] is True
        finally:
            await runner.cleanup()

    asyncio.run(run())


def test_server_streams_sse():
    async def run():
        captured: Dict[str, Any] = {"requests": []}
        upstream_runner, upstream_base = await _start_runner(_build_fake_upstream(captured))
        adapter = FakeAdapter(f"{upstream_base}/v1", allowed=["/sse"])
        proxy_runner, proxy_base = await _start_runner(create_app(adapter))
        try:
            async with aiohttp.ClientSession() as session:
                async with session.get(f"{proxy_base}/v1/sse") as resp:
                    assert resp.status == 200
                    chunks = []
                    async for chunk in resp.content.iter_any():
                        chunks.append(chunk)
                    full = b"".join(chunks)
                    assert b"data: hello" in full
                    assert b"data: [DONE]" in full
        finally:
            await proxy_runner.cleanup()
            await upstream_runner.cleanup()

    asyncio.run(run())


def test_server_strips_client_auth_header():
    """The client's Authorization header MUST NOT reach the upstream."""
    async def run():
        captured: Dict[str, Any] = {"requests": []}
        upstream_runner, upstream_base = await _start_runner(_build_fake_upstream(captured))
        adapter = FakeAdapter(f"{upstream_base}/v1", bearer="ours")
        proxy_runner, proxy_base = await _start_runner(create_app(adapter))
        try:
            async with aiohttp.ClientSession() as session:
                async with session.post(
                    f"{proxy_base}/v1/chat/completions",
                    json={},
                    headers={"Authorization": "Bearer SHOULD_NOT_LEAK"},
                ) as resp:
                    await resp.read()
            assert captured["requests"][0]["auth"] == "Bearer ours"
            assert "SHOULD_NOT_LEAK" not in captured["requests"][0]["auth"]
        finally:
            await proxy_runner.cleanup()
            await upstream_runner.cleanup()

    asyncio.run(run())


# ---------------------------------------------------------------------------
# CLI handlers
# ---------------------------------------------------------------------------


def test_cmd_proxy_status_runs(capsys, tmp_path, monkeypatch):
    monkeypatch.setenv("HERMES_HOME", str(tmp_path))
    from hermes_cli.proxy.cli import cmd_proxy_status

    args = MagicMock()
    rc = cmd_proxy_status(args)
    assert rc == 0
    out = capsys.readouterr().out
    assert "nous" in out
    assert "Nous Portal" in out
    assert "not logged in" in out


def test_cmd_proxy_providers_runs(capsys):
    from hermes_cli.proxy.cli import cmd_proxy_list_providers

    args = MagicMock()
    rc = cmd_proxy_list_providers(args)
    assert rc == 0
    out = capsys.readouterr().out
    assert "nous" in out
    assert "Nous Portal" in out


def test_cmd_proxy_start_refuses_unknown_provider(capsys):
    from hermes_cli.proxy.cli import cmd_proxy_start

    args = MagicMock()
    args.provider = "no-such-provider"
    args.host = None
    args.port = None
    rc = cmd_proxy_start(args)
    assert rc == 2
    err = capsys.readouterr().err
    assert "no-such-provider" in err


def test_cmd_proxy_start_refuses_when_unauthenticated(capsys, tmp_path, monkeypatch):
    monkeypatch.setenv("HERMES_HOME", str(tmp_path))
    from hermes_cli.proxy.cli import cmd_proxy_start

    args = MagicMock()
    args.provider = "nous"
    args.host = None
    args.port = None
    rc = cmd_proxy_start(args)
    assert rc == 2
    err = capsys.readouterr().err
    assert "hermes login nous" in err