"""Tests for sidecar HTTP endpoints — Issue #2."""
import pytest
import tempfile
from pathlib import Path
from unittest.mock import patch, mock_open

from fastapi.testclient import TestClient
from sidecar.app import app as sidecar_app


@pytest.fixture(autouse=True)
def reset_sidecar_state():
    """Reset shared sidecar state between tests."""
    import sidecar.app
    old_active = sidecar.app._active_profile
    old_proc = sidecar.app._llama_server_process
    sidecar.app._active_profile = None
    sidecar.app._llama_server_process = None
    yield
    sidecar.app._active_profile = old_active
    sidecar.app._llama_server_process = old_proc


@pytest.fixture
def tmp_manifest(tmp_path):
    """Create a temporary manifest file for testing."""
    manifest_file = tmp_path / "manifest.yaml"
    manifest_file.write_text(
        "- id: qwen-3-8b\n"
        "  name: \"Qwen 3 8B\"\n"
        "  model_path: /home/bigt/AI/llm/qwen/qwen3-8b-q4.gguf\n"
        "  flags:\n"
        "    n_ctx: 8192\n"
        "    n_gpu_layers: 35\n"
        "- id: llama-4-maverick\n"
        "  name: \"Llama 4 Maverick\"\n"
        "  model_path: /home/bigt/AI/llm/llama4/llama4-maverick-q4.gguf\n"
    )
    return manifest_file


@pytest.fixture
def client(tmp_manifest):
    """Create a test client with a temporary manifest."""
    with patch("sidecar.app.MANIFEST_PATH", str(tmp_manifest)):
        yield TestClient(sidecar_app)


class TestModelsAvailable:
    """Tests for GET /models/available."""

    def test_returns_profiles_from_manifest(self, client):
        response = client.get("/models/available")
        assert response.status_code == 200
        data = response.json()
        assert len(data) == 2
        assert data[0]["id"] == "qwen-3-8b"
        assert data[0]["name"] == "Qwen 3 8B"
        assert data[0]["model_path"] == "/home/bigt/AI/llm/qwen/qwen3-8b-q4.gguf"
        assert "flags" in data[0]

    def test_empty_manifest_returns_empty_list(self, tmp_path):
        manifest_file = tmp_path / "empty.yaml"
        manifest_file.write_text("[]\n")
        with patch("sidecar.app.MANIFEST_PATH", str(manifest_file)):
            client = TestClient(sidecar_app)
            response = client.get("/models/available")
            assert response.status_code == 200
            assert response.json() == []

    def test_invalid_yaml_returns_500(self, tmp_path):
        manifest_file = tmp_path / "invalid.yaml"
        manifest_file.write_text("{{{{bad yaml:::\n")
        with patch("sidecar.app.MANIFEST_PATH", str(manifest_file)):
            client = TestClient(sidecar_app)
            response = client.get("/models/available")
            assert response.status_code == 500
            body = response.json()
            assert "detail" in body

    def test_missing_file_returns_500(self):
        with patch("sidecar.app.MANIFEST_PATH", "/tmp/does_not_exist_12345.yaml"):
            client = TestClient(sidecar_app)
            response = client.get("/models/available")
            assert response.status_code == 500
            body = response.json()
            assert "detail" in body

    def test_each_profile_has_required_fields(self, client):
        response = client.get("/models/available")
        profiles = response.json()
        for p in profiles:
            assert "id" in p
            assert "name" in p
            assert "model_path" in p
            assert "flags" in p


class TestModelsStatus:
    """Tests for GET /models/status."""

    def test_returns_inactive_status(self, client):
        response = client.get("/models/status")
        assert response.status_code == 200
        data = response.json()
        assert data["active_profile"] is None
        assert data["llama_server_running"] is False