"""Integration tests for NATS publisher functionality.

Tests cover:
- NATS message receipt with JSON schema validation
- Skip behavior when Docker/NATS unavailable
- Container lifecycle management (cleanup)
- JSON schema field/type validation
"""

from __future__ import annotations

import json
import socket
import subprocess
import time
from typing import TYPE_CHECKING, cast

import pytest

if TYPE_CHECKING:
    from collections.abc import Generator


def _find_open_port() -> int:
    """Find an available TCP port on localhost."""
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
        sock.bind(("127.0.0.1", 0))
        sock.listen(1)
        addr = cast(tuple[str, int], sock.getsockname())
        port: int = addr[1]
    return port


# Constants for test configuration
NATS_SUBJECT = "scoliosis.result"
CONTAINER_NAME = "opengait-nats-test"


def _docker_available() -> bool:
    """Check if Docker is available and running."""
    try:
        result = subprocess.run(
            ["docker", "info"],
            capture_output=True,
            timeout=5,
            check=False,
        )
        return result.returncode == 0
    except (subprocess.TimeoutExpired, FileNotFoundError, OSError):
        return False


def _nats_container_running() -> bool:
    """Check if NATS container is already running."""
    try:
        result = subprocess.run(
            [
                "docker",
                "ps",
                "--filter",
                f"name={CONTAINER_NAME}",
                "--format",
                "{{.Names}}",
            ],
            capture_output=True,
            timeout=5,
            check=False,
        )
        return CONTAINER_NAME in result.stdout.decode()
    except (subprocess.TimeoutExpired, FileNotFoundError, OSError):
        return False


def _start_nats_container(port: int) -> bool:
    """Start NATS container for testing."""
    try:
        # Remove existing container if present
        _ = subprocess.run(
            ["docker", "rm", "-f", CONTAINER_NAME],
            capture_output=True,
            timeout=10,
            check=False,
        )

        # Start new NATS container
        result = subprocess.run(
            [
                "docker",
                "run",
                "-d",
                "--name",
                CONTAINER_NAME,
                "-p",
                f"{port}:4222",
                "nats:latest",
            ],
            capture_output=True,
            timeout=30,
            check=False,
        )

        if result.returncode != 0:
            return False

        # Wait for NATS to be ready (max 10 seconds)
        for _ in range(20):
            time.sleep(0.5)
            try:
                check_result = subprocess.run(
                    [
                        "docker",
                        "exec",
                        CONTAINER_NAME,
                        "nats",
                        "server",
                        "check",
                        "server",
                    ],
                    capture_output=True,
                    timeout=5,
                    check=False,
                )
                if check_result.returncode == 0:
                    return True
            except (subprocess.TimeoutExpired, FileNotFoundError, OSError):
                continue

        return False
    except (subprocess.TimeoutExpired, FileNotFoundError, OSError):
        return False


def _stop_nats_container() -> None:
    """Stop and remove NATS container."""
    try:
        _ = subprocess.run(
            ["docker", "rm", "-f", CONTAINER_NAME],
            capture_output=True,
            timeout=10,
            check=False,
        )
    except (subprocess.TimeoutExpired, FileNotFoundError, OSError):
        pass


def _validate_result_schema(data: dict[str, object]) -> tuple[bool, str]:
    """Validate JSON result schema.

    Expected schema:
    {
        "frame": int,
        "track_id": int,
        "label": str (one of: "negative", "neutral", "positive"),
        "confidence": float in [0, 1],
        "window": int (non-negative),
        "timestamp_ns": int
    }
    """
    required_fields: set[str] = {
        "frame",
        "track_id",
        "label",
        "confidence",
        "window",
        "timestamp_ns",
    }
    missing = required_fields - set(data.keys())
    if missing:
        return False, f"Missing required fields: {missing}"

    # Validate frame (int)
    frame = data["frame"]
    if not isinstance(frame, int):
        return False, f"frame must be int, got {type(frame)}"

    # Validate track_id (int)
    track_id = data["track_id"]
    if not isinstance(track_id, int):
        return False, f"track_id must be int, got {type(track_id)}"

    # Validate label (str in specific set)
    label = data["label"]
    valid_labels = {"negative", "neutral", "positive"}
    if not isinstance(label, str) or label not in valid_labels:
        return False, f"label must be one of {valid_labels}, got {label}"

    # Validate confidence (float in [0, 1])
    confidence = data["confidence"]
    if not isinstance(confidence, (int, float)):
        return False, f"confidence must be numeric, got {type(confidence)}"
    if not 0.0 <= float(confidence) <= 1.0:
        return False, f"confidence must be in [0, 1], got {confidence}"
    # Validate window (int, non-negative)
    window = data["window"]
    if not isinstance(window, int):
        return False, f"window must be int, got {type(window)}"
    if window < 0:
        return False, f"window must be non-negative, got {window}"


    # Validate timestamp_ns (int)
    timestamp_ns = data["timestamp_ns"]
    if not isinstance(timestamp_ns, int):
        return False, f"timestamp_ns must be int, got {type(timestamp_ns)}"

    return True, ""


@pytest.fixture(scope="module")
def nats_server() -> "Generator[tuple[bool, int], None, None]":
    """Fixture to manage NATS container lifecycle.

    Yields (True, port) if NATS is available, (False, 0) otherwise.
    Cleans up container after tests.
    """
    if not _docker_available():
        yield False, 0
        return

    port = _find_open_port()
    if not _start_nats_container(port):
        yield False, 0
        return

    try:
        yield True, port
    finally:
        _stop_nats_container()


class TestNatsPublisherIntegration:
    """Integration tests for NATS publisher with live server."""

    @pytest.mark.skipif(not _docker_available(), reason="Docker not available")
    def test_nats_message_receipt_and_schema_validation(
        self, nats_server: tuple[bool, int]
    ) -> None:
        """Test that messages are received and match expected schema."""
        server_available, port = nats_server
        if not server_available:
            pytest.skip("NATS server not available")

        nats_url = f"nats://127.0.0.1:{port}"

        # Import here to avoid issues if nats-py not installed
        try:
            import asyncio

            import nats  # type: ignore[import-untyped]

        except ImportError:
            pytest.skip("nats-py not installed")

        from opengait_studio.output import NatsPublisher, create_result

        # Create publisher
        publisher = NatsPublisher(nats_url, subject=NATS_SUBJECT)

        # Create test results
        test_results = [
            create_result(
                frame=100,
                track_id=1,
                label="positive",
                confidence=0.85,
                window=(70, 100),
                timestamp_ns=1234567890000,
            ),
            create_result(
                frame=130,
                track_id=1,
                label="negative",
                confidence=0.92,
                window=(100, 130),
                timestamp_ns=1234567890030,
            ),
            create_result(
                frame=160,
                track_id=2,
                label="neutral",
                confidence=0.78,
                window=(130, 160),
                timestamp_ns=1234567890060,
            ),
        ]

        # Collect received messages
        received_messages: list[dict[str, object]] = []

        async def subscribe_and_publish():
            """Subscribe to subject, publish messages, collect results."""
            nc = await nats.connect(nats_url)  # pyright: ignore[reportUnknownMemberType]

            # Subscribe
            sub = await nc.subscribe(NATS_SUBJECT)  # pyright: ignore[reportUnknownMemberType]

            # Publish all test results
            for result in test_results:
                publisher.publish(result)

            # Wait for messages with timeout
            for _ in range(len(test_results)):
                try:
                    msg = await asyncio.wait_for(sub.next_msg(), timeout=5.0)
                    data = json.loads(msg.data.decode("utf-8"))  # pyright: ignore[reportAny]
                    received_messages.append(cast(dict[str, object], data))
                except asyncio.TimeoutError:
                    break

            await sub.unsubscribe()
            await nc.close()

        # Run async subscriber
        asyncio.run(subscribe_and_publish())

        # Cleanup publisher
        publisher.close()

        # Verify all messages received
        assert len(received_messages) == len(test_results), (
            f"Expected {len(test_results)} messages, got {len(received_messages)}"
        )

        # Validate schema for each message
        for i, msg in enumerate(received_messages):
            is_valid, error = _validate_result_schema(msg)
            assert is_valid, f"Message {i} schema validation failed: {error}"

        # Verify specific values
        assert received_messages[0]["frame"] == 100
        assert received_messages[0]["label"] == "positive"
        assert received_messages[0]["track_id"] == 1
        _conf = received_messages[0]["confidence"]
        assert isinstance(_conf, (int, float))
        assert 0.0 <= float(_conf) <= 1.0

        assert received_messages[1]["label"] == "negative"
        assert received_messages[2]["track_id"] == 2

    @pytest.mark.skipif(not _docker_available(), reason="Docker not available")
    def test_nats_publisher_graceful_when_server_unavailable(self) -> None:
        """Test that publisher handles missing server gracefully."""
        try:
            from opengait_studio.output import NatsPublisher
        except ImportError:
            pytest.skip("output module not available")

        # Use wrong port where no server is running
        bad_url = "nats://127.0.0.1:14222"
        publisher = NatsPublisher(bad_url, subject=NATS_SUBJECT)

        # Should not raise when publishing without server
        test_result: dict[str, object] = {
            "frame": 1,
            "track_id": 1,
            "label": "positive",
            "confidence": 0.85,
            "window": 30,
            "timestamp_ns": 1234567890,
        }

        # Should not raise
        publisher.publish(test_result)

        # Cleanup should also not raise
        publisher.close()

    @pytest.mark.skipif(not _docker_available(), reason="Docker not available")
    def test_nats_publisher_context_manager(
        self, nats_server: tuple[bool, int]
    ) -> None:
        """Test that publisher works as context manager."""
        server_available, port = nats_server
        if not server_available:
            pytest.skip("NATS server not available")

        nats_url = f"nats://127.0.0.1:{port}"

        try:
            import asyncio

            import nats  # type: ignore[import-untyped]
            from opengait_studio.output import NatsPublisher, create_result
        except ImportError as e:
            pytest.skip(f"Required module not available: {e}")

        received_messages: list[dict[str, object]] = []

        async def subscribe_and_test():
            nc = await nats.connect(nats_url)  # pyright: ignore[reportUnknownMemberType]
            sub = await nc.subscribe(NATS_SUBJECT)  # pyright: ignore[reportUnknownMemberType]

            # Use context manager
            with NatsPublisher(nats_url, subject=NATS_SUBJECT) as publisher:
                result = create_result(
                    frame=200,
                    track_id=5,
                    label="neutral",
                    confidence=0.65,
                    window=(170, 200),
                    timestamp_ns=9999999999,
                )
                publisher.publish(result)

                # Wait for message
                try:
                    msg = await asyncio.wait_for(sub.next_msg(), timeout=5.0)
                    data = json.loads(msg.data.decode("utf-8"))  # pyright: ignore[reportAny]
                    received_messages.append(cast(dict[str, object], data))
                except asyncio.TimeoutError:
                    pass

            await sub.unsubscribe()
            await nc.close()

        asyncio.run(subscribe_and_test())

        assert len(received_messages) == 1
        assert received_messages[0]["frame"] == 200
        assert received_messages[0]["track_id"] == 5


class TestNatsSchemaValidation:
    """Tests for JSON schema validation without requiring NATS server."""

    def test_validate_result_schema_valid(self) -> None:
        """Test schema validation with valid data."""
        valid_data: dict[str, object] = {
            "frame": 1234,
            "track_id": 42,
            "label": "positive",
            "confidence": 0.85,
            "window": 1230,
            "timestamp_ns": 1234567890000,
        }

        is_valid, error = _validate_result_schema(valid_data)
        assert is_valid, f"Valid data rejected: {error}"

    def test_validate_result_schema_invalid_label(self) -> None:
        """Test schema validation rejects invalid label."""
        invalid_data: dict[str, object] = {
            "frame": 1234,
            "track_id": 42,
            "label": "invalid_label",
            "confidence": 0.85,
            "window": 1230,
            "timestamp_ns": 1234567890000,
        }

        is_valid, error = _validate_result_schema(invalid_data)
        assert not is_valid
        assert "label" in error.lower()

    def test_validate_result_schema_confidence_out_of_range(self) -> None:
        """Test schema validation rejects confidence outside [0, 1]."""
        invalid_data: dict[str, object] = {
            "frame": 1234,
            "track_id": 42,
            "label": "positive",
            "confidence": 1.5,
            "window": 1230,
            "timestamp_ns": 1234567890000,
        }

        is_valid, error = _validate_result_schema(invalid_data)
        assert not is_valid
        assert "confidence" in error.lower()

    def test_validate_result_schema_missing_fields(self) -> None:
        """Test schema validation detects missing fields."""
        incomplete_data: dict[str, object] = {
            "frame": 1234,
            "label": "positive",
        }

        is_valid, error = _validate_result_schema(incomplete_data)
        assert not is_valid
        assert "missing" in error.lower()

    def test_validate_result_schema_wrong_types(self) -> None:
        """Test schema validation rejects wrong types."""
        wrong_types: dict[str, object] = {
            "frame": "not_an_int",
            "track_id": 42,
            "label": "positive",
            "confidence": 0.85,
            "window": 1230,
            "timestamp_ns": 1234567890000,
        }

        is_valid, error = _validate_result_schema(wrong_types)
        assert not is_valid
        assert "frame" in error.lower()

    def test_all_valid_labels_accepted(self) -> None:
        """Test that all valid labels are accepted."""
        for label_str in ["negative", "neutral", "positive"]:
            data: dict[str, object] = {
                "frame": 100,
                "track_id": 1,
                "label": label_str,
                "confidence": 0.5,
                "window": 100,
                "timestamp_ns": 1234567890,
            }
            is_valid, error = _validate_result_schema(data)
            assert is_valid, f"Valid label '{label_str}' rejected: {error}"


class TestDockerAvailability:
    """Tests for Docker availability detection."""

    def test_docker_available_check(self) -> None:
        """Test Docker availability check doesn't crash."""
        # This should not raise
        result = _docker_available()
        assert isinstance(result, bool)

    def test_nats_container_running_check(self) -> None:
        """Test container running check doesn't crash."""
        # This should not raise even if Docker not available
        result = _nats_container_running()
        assert isinstance(result, bool)