"""Unit tests for diagnostics endpoints."""
from unittest.mock import MagicMock, patch

import pytest

from src.server.api.diagnostics import (
    NetworkTestResult,
    check_dns,
    network_diagnostics,
    test_host_connectivity,
)


class TestDiagnosticsEndpoint:
    """Test diagnostics API endpoints."""

    @pytest.mark.asyncio
    async def test_network_diagnostics_returns_standard_format(self):
        """Test that network diagnostics returns the expected format."""
        # Mock authentication
        mock_auth = {"user_id": "test_user"}

        # Mock the helper functions
        with patch(
            "src.server.api.diagnostics.check_dns",
            return_value=True
        ), patch(
            "src.server.api.diagnostics.test_host_connectivity",
            side_effect=[
                NetworkTestResult(
                    host="google.com",
                    reachable=True,
                    response_time_ms=50.5
                ),
                NetworkTestResult(
                    host="cloudflare.com",
                    reachable=True,
                    response_time_ms=30.2
                ),
                NetworkTestResult(
                    host="github.com",
                    reachable=True,
                    response_time_ms=100.0
                ),
                NetworkTestResult(
                    host="aniworld.to",
                    reachable=True,
                    response_time_ms=75.3
                ),
            ]
        ):
            # Call the endpoint
            result = await network_diagnostics(auth=mock_auth)

            # Verify response structure
            assert isinstance(result, dict)
            assert "status" in result
            assert "data" in result
            assert result["status"] == "success"

            # Verify data structure
            data = result["data"]
            assert "internet_connected" in data
            assert "dns_working" in data
            assert "aniworld_reachable" in data
            assert "tests" in data

            # Verify values
            assert data["internet_connected"] is True
            assert data["dns_working"] is True
            assert data["aniworld_reachable"] is True
            assert len(data["tests"]) == 4

    @pytest.mark.asyncio
    async def test_network_diagnostics_aniworld_unreachable(self):
        """Test diagnostics when aniworld.to is unreachable."""
        mock_auth = {"user_id": "test_user"}

        with patch(
            "src.server.api.diagnostics.check_dns",
            return_value=True
        ), patch(
            "src.server.api.diagnostics.test_host_connectivity",
            side_effect=[
                NetworkTestResult(
                    host="google.com",
                    reachable=True,
                    response_time_ms=50.5
                ),
                NetworkTestResult(
                    host="cloudflare.com",
                    reachable=True,
                    response_time_ms=30.2
                ),
                NetworkTestResult(
                    host="github.com",
                    reachable=True,
                    response_time_ms=100.0
                ),
                NetworkTestResult(
                    host="aniworld.to",
                    reachable=False,
                    error="Connection timeout"
                ),
            ]
        ):
            result = await network_diagnostics(auth=mock_auth)

            # Verify aniworld is marked as unreachable
            assert result["status"] == "success"
            assert result["data"]["aniworld_reachable"] is False
            assert result["data"]["internet_connected"] is True

    @pytest.mark.asyncio
    async def test_network_diagnostics_all_unreachable(self):
        """Test diagnostics when all hosts are unreachable."""
        mock_auth = {"user_id": "test_user"}

        with patch(
            "src.server.api.diagnostics.check_dns",
            return_value=False
        ), patch(
            "src.server.api.diagnostics.test_host_connectivity",
            side_effect=[
                NetworkTestResult(
                    host="google.com",
                    reachable=False,
                    error="Connection timeout"
                ),
                NetworkTestResult(
                    host="cloudflare.com",
                    reachable=False,
                    error="Connection timeout"
                ),
                NetworkTestResult(
                    host="github.com",
                    reachable=False,
                    error="Connection timeout"
                ),
                NetworkTestResult(
                    host="aniworld.to",
                    reachable=False,
                    error="Connection timeout"
                ),
            ]
        ):
            result = await network_diagnostics(auth=mock_auth)

            # Verify all are unreachable
            assert result["status"] == "success"
            assert result["data"]["internet_connected"] is False
            assert result["data"]["dns_working"] is False
            assert result["data"]["aniworld_reachable"] is False


class TestNetworkHelpers:
    """Test network helper functions."""

    @pytest.mark.asyncio
    async def test_check_dns_success(self):
        """Test DNS check when DNS is working."""
        with patch("socket.gethostbyname", return_value="142.250.185.78"):
            result = await check_dns()
            assert result is True

    @pytest.mark.asyncio
    async def test_check_dns_failure(self):
        """Test DNS check when DNS fails."""
        import socket
        with patch(
            "socket.gethostbyname",
            side_effect=socket.gaierror("DNS lookup failed")
        ):
            result = await check_dns()
            assert result is False

    @pytest.mark.asyncio
    async def test_host_connectivity_success(self):
        """Test host connectivity check when host is reachable."""
        with patch(
            "socket.create_connection",
            return_value=MagicMock()
        ):
            result = await test_host_connectivity("google.com", 80)
            assert result.host == "google.com"
            assert result.reachable is True
            assert result.response_time_ms is not None
            assert result.response_time_ms >= 0
            assert result.error is None

    @pytest.mark.asyncio
    async def test_host_connectivity_timeout(self):
        """Test host connectivity when connection times out."""
        import asyncio
        with patch(
            "socket.create_connection",
            side_effect=asyncio.TimeoutError()
        ):
            result = await test_host_connectivity("example.com", 80, 1.0)
            assert result.host == "example.com"
            assert result.reachable is False
            assert result.error == "Connection timeout"

    @pytest.mark.asyncio
    async def test_host_connectivity_dns_failure(self):
        """Test host connectivity when DNS resolution fails."""
        import socket
        with patch(
            "socket.create_connection",
            side_effect=socket.gaierror("Name resolution failed")
        ):
            result = await test_host_connectivity("invalid.host", 80)
            assert result.host == "invalid.host"
            assert result.reachable is False
            assert "DNS resolution failed" in result.error

    @pytest.mark.asyncio
    async def test_host_connectivity_connection_refused(self):
        """Test host connectivity when connection is refused."""
        with patch(
            "socket.create_connection",
            side_effect=ConnectionRefusedError()
        ):
            result = await test_host_connectivity("localhost", 12345)
            assert result.host == "localhost"
            assert result.reachable is False
            assert result.error == "Connection refused"