"""
TDD Tests for API endpoints.

These tests verify the API contract for all voice-server endpoints:
- POST /notify: TTS request submission
- GET /health: Health check
- GET /voices: Voice model listing

Uses httpx.AsyncClient for async endpoint testing with FastAPI's TestClient.
"""

import pytest
from httpx import AsyncClient, ASGITransport

from app.main import app


@pytest.fixture
async def client():
    """Create an async test client for the FastAPI app."""
    async with AsyncClient(
        transport=ASGITransport(app=app),
        base_url="http://test",
    ) as client:
        yield client


class TestNotifyEndpoint:
    """Tests for POST /notify endpoint."""

    async def test_valid_request_returns_202(self, client: AsyncClient):
        """
        A valid request with just a message should return 202 Accepted.
        """
        response = await client.post(
            "/notify",
            json={"message": "Hello, world!"},
        )

        assert response.status_code == 202

    async def test_valid_request_returns_queued_status(self, client: AsyncClient):
        """
        Response should include status='queued' for successful requests.
        """
        response = await client.post(
            "/notify",
            json={"message": "Test message"},
        )

        data = response.json()
        assert data["status"] == "queued"

    async def test_response_includes_message_length(self, client: AsyncClient):
        """
        Response should include the length of the submitted message.
        """
        message = "This is a test message"
        response = await client.post(
            "/notify",
            json={"message": message},
        )

        data = response.json()
        assert data["message_length"] == len(message)

    async def test_response_includes_queue_position(self, client: AsyncClient):
        """
        Response should include the queue position.
        """
        response = await client.post(
            "/notify",
            json={"message": "Test"},
        )

        data = response.json()
        assert "queue_position" in data
        assert isinstance(data["queue_position"], int)
        assert data["queue_position"] >= 1

    async def test_response_includes_voice_model(self, client: AsyncClient):
        """
        Response should include the voice model being used.
        """
        response = await client.post(
            "/notify",
            json={"message": "Test"},
        )

        data = response.json()
        assert "voice_model" in data
        assert isinstance(data["voice_model"], str)  # uses server default

    async def test_custom_voice_is_preserved(self, client: AsyncClient):
        """
        Custom voice selection should be reflected in response.
        """
        response = await client.post(
            "/notify",
            json={"message": "Test", "voice": "en_US-libritts-high"},
        )

        data = response.json()
        assert data["voice_model"] == "en_US-libritts-high"

    async def test_missing_message_returns_422(self, client: AsyncClient):
        """
        Request without message should return 422 Unprocessable Entity.
        """
        response = await client.post(
            "/notify",
            json={},
        )

        assert response.status_code == 422

    async def test_empty_message_returns_422(self, client: AsyncClient):
        """
        Empty message string should return 422 Unprocessable Entity.
        """
        response = await client.post(
            "/notify",
            json={"message": ""},
        )

        assert response.status_code == 422

    async def test_message_too_long_returns_422(self, client: AsyncClient):
        """
        Message over 10000 characters should return 422.
        """
        response = await client.post(
            "/notify",
            json={"message": "a" * 10001},
        )

        assert response.status_code == 422

    async def test_invalid_rate_returns_422(self, client: AsyncClient):
        """
        Rate outside valid range should return 422.
        """
        response = await client.post(
            "/notify",
            json={"message": "Test", "rate": 500},
        )

        assert response.status_code == 422

    async def test_invalid_voice_pattern_returns_422(self, client: AsyncClient):
        """
        Voice with invalid characters should return 422.
        """
        response = await client.post(
            "/notify",
            json={"message": "Test", "voice": "invalid/voice"},
        )

        assert response.status_code == 422

    async def test_malformed_json_returns_422(self, client: AsyncClient):
        """
        Malformed JSON should return 422.
        """
        response = await client.post(
            "/notify",
            content="not valid json",
            headers={"Content-Type": "application/json"},
        )

        assert response.status_code == 422

    async def test_whitespace_message_is_stripped(self, client: AsyncClient):
        """
        Whitespace in message should be stripped.
        """
        response = await client.post(
            "/notify",
            json={"message": "  Hello  "},
        )

        assert response.status_code == 202
        data = response.json()
        assert data["message_length"] == 5  # "Hello" without whitespace


class TestHealthEndpoint:
    """Tests for GET /health endpoint."""

    async def test_health_returns_200(self, client: AsyncClient):
        """
        Health endpoint should return 200 when healthy.
        """
        response = await client.get("/health")

        assert response.status_code == 200

    async def test_health_returns_status(self, client: AsyncClient):
        """
        Health response should include status field.
        """
        response = await client.get("/health")

        data = response.json()
        assert "status" in data
        assert data["status"] in ["healthy", "unhealthy"]

    async def test_health_returns_uptime(self, client: AsyncClient):
        """
        Health response should include uptime in seconds.
        """
        response = await client.get("/health")

        data = response.json()
        assert "uptime_seconds" in data
        assert isinstance(data["uptime_seconds"], int)
        assert data["uptime_seconds"] >= 0

    async def test_health_returns_queue_status(self, client: AsyncClient):
        """
        Health response should include queue status.
        """
        response = await client.get("/health")

        data = response.json()
        assert "queue" in data
        assert "size" in data["queue"]
        assert "capacity" in data["queue"]
        assert "utilization" in data["queue"]

    async def test_health_returns_tts_engine(self, client: AsyncClient):
        """
        Health response should include TTS engine info.
        """
        response = await client.get("/health")

        data = response.json()
        assert "tts_engine" in data
        assert data["tts_engine"] == "piper"

    async def test_health_returns_audio_output(self, client: AsyncClient):
        """
        Health response should include audio output status.
        """
        response = await client.get("/health")

        data = response.json()
        assert "audio_output" in data


class TestVoicesEndpoint:
    """Tests for GET /voices endpoint."""

    async def test_voices_returns_200(self, client: AsyncClient):
        """
        Voices endpoint should return 200.
        """
        response = await client.get("/voices")

        assert response.status_code == 200

    async def test_voices_returns_list(self, client: AsyncClient):
        """
        Voices response should include a list of voices.
        """
        response = await client.get("/voices")

        data = response.json()
        assert "voices" in data
        assert isinstance(data["voices"], list)

    async def test_voices_returns_default_voice(self, client: AsyncClient):
        """
        Voices response should include the default voice.
        """
        response = await client.get("/voices")

        data = response.json()
        assert "default_voice" in data
        assert isinstance(data["default_voice"], str)  # uses server config


class TestOpenAPIDocumentation:
    """Tests for API documentation endpoints."""

    async def test_openapi_json_available(self, client: AsyncClient):
        """
        OpenAPI JSON should be available at /openapi.json.
        """
        response = await client.get("/openapi.json")

        assert response.status_code == 200
        data = response.json()
        assert "openapi" in data
        assert "paths" in data

    async def test_docs_endpoint_available(self, client: AsyncClient):
        """
        Swagger UI should be available at /docs.
        """
        response = await client.get("/docs")

        assert response.status_code == 200
        assert "text/html" in response.headers.get("content-type", "")


class TestCORS:
    """Tests for CORS middleware."""

    async def test_cors_headers_present(self, client: AsyncClient):
        """
        CORS headers should be present in responses.
        """
        response = await client.options(
            "/notify",
            headers={
                "Origin": "http://localhost:3000",
                "Access-Control-Request-Method": "POST",
            },
        )

        # FastAPI returns 200 for OPTIONS with CORS
        assert response.status_code == 200
        assert "access-control-allow-origin" in response.headers