"""
Tests for delegation infrastructure.

Tests the DelegationTask dataclass and delegation wrapper functions
that implement the agent-as-tool pattern.
"""
import pytest
from unittest.mock import AsyncMock, patch, MagicMock

from src.agents.delegation import (
    DelegationTask,
    DelegationResult,
    delegate_to_librarian,
)


@pytest.mark.unit
class TestDelegationTask:
    """Tests for the DelegationTask dataclass."""

    def test_delegation_task_creation(self):
        """Test basic DelegationTask creation."""
        task = DelegationTask(
            expert_name="librarian",
            task="Create a wiki page about CI/CD",
            context="User is setting up a homelab",
            action="create",
        )

        assert task.expert_name == "librarian"
        assert task.task == "Create a wiki page about CI/CD"
        assert task.context == "User is setting up a homelab"
        assert task.action == "create"

    def test_delegation_task_default_values(self):
        """Test DelegationTask default values."""
        task = DelegationTask(
            expert_name="librarian",
            task="Search for Docker info",
        )

        assert task.context == ""
        assert task.action == ""
        assert task.priority == 0
        assert task.depends_on == []
        assert task.result is None

    def test_delegation_task_auto_generates_id(self):
        """Test DelegationTask auto-generates unique IDs."""
        task1 = DelegationTask(expert_name="librarian", task="Task 1")
        task2 = DelegationTask(expert_name="librarian", task="Task 2")

        assert task1.task_id.startswith("librarian_")
        assert task2.task_id.startswith("librarian_")
        assert task1.task_id != task2.task_id

    def test_delegation_task_preserves_custom_id(self):
        """Test DelegationTask preserves custom ID if provided."""
        task = DelegationTask(
            expert_name="librarian",
            task="Custom task",
            task_id="custom_id_123",
        )

        assert task.task_id == "custom_id_123"

    def test_delegation_task_with_dependencies(self):
        """Test DelegationTask with dependencies."""
        task = DelegationTask(
            expert_name="librarian",
            task="Update wiki page",
            depends_on=["memory_abc123", "search_def456"],
        )

        assert len(task.depends_on) == 2
        assert "memory_abc123" in task.depends_on


@pytest.mark.unit
class TestDelegationResult:
    """Tests for the DelegationResult dataclass."""

    def test_delegation_result_success(self):
        """Test successful DelegationResult."""
        result = DelegationResult(
            expert_name="librarian",
            task="Search for Docker info",
            success=True,
            output="Found 5 relevant documents about Docker...",
        )

        assert result.expert_name == "librarian"
        assert result.success is True
        assert result.output.startswith("Found")
        assert result.error is None

    def test_delegation_result_failure(self):
        """Test failed DelegationResult."""
        result = DelegationResult(
            expert_name="librarian",
            task="Search for Docker info",
            success=False,
            output="",
            error="Connection timeout to library-desk API",
        )

        assert result.success is False
        assert result.output == ""
        assert result.error == "Connection timeout to library-desk API"


@pytest.mark.unit
class TestDelegateToLibrarian:
    """Tests for the delegate_to_librarian wrapper."""

    @pytest.mark.asyncio
    async def test_delegate_to_librarian_success(self):
        """Test successful delegation to Librarian."""
        mock_output = "Successfully created wiki page about CI/CD pipelines..."

        with patch(
            "src.agents.librarian.agent.run_librarian",
            new_callable=AsyncMock,
            return_value=mock_output,
        ) as mock_run:
            result = await delegate_to_librarian(
                task="Create a wiki page about CI/CD pipelines",
                context="User is setting up a homelab",
            )

            # Verify run_librarian was called correctly
            mock_run.assert_called_once_with(
                task="Create a wiki page about CI/CD pipelines",
                context="User is setting up a homelab",
            )

            # Verify result
            assert isinstance(result, DelegationResult)
            assert result.expert_name == "librarian"
            assert result.success is True
            assert result.output == mock_output
            assert result.error is None

    @pytest.mark.asyncio
    async def test_delegate_to_librarian_without_context(self):
        """Test delegation to Librarian without context."""
        mock_output = "Found information about Docker networking..."

        with patch(
            "src.agents.librarian.agent.run_librarian",
            new_callable=AsyncMock,
            return_value=mock_output,
        ) as mock_run:
            result = await delegate_to_librarian(
                task="Search for information about Docker networking",
            )

            mock_run.assert_called_once_with(
                task="Search for information about Docker networking",
                context="",
            )

            assert result.success is True
            assert result.output == mock_output

    @pytest.mark.asyncio
    async def test_delegate_to_librarian_handles_error(self):
        """Test delegation handles Librarian errors gracefully."""
        with patch(
            "src.agents.librarian.agent.run_librarian",
            new_callable=AsyncMock,
            side_effect=Exception("Connection refused"),
        ):
            result = await delegate_to_librarian(
                task="Search for information",
            )

            assert isinstance(result, DelegationResult)
            assert result.success is False
            assert result.output == ""
            assert result.error == "Connection refused"

    @pytest.mark.asyncio
    async def test_delegate_to_librarian_preserves_task(self):
        """Test delegation result preserves original task."""
        original_task = "Create a wiki page about Kubernetes deployments"

        with patch(
            "src.agents.librarian.agent.run_librarian",
            new_callable=AsyncMock,
            return_value="Page created",
        ):
            result = await delegate_to_librarian(task=original_task)

            assert result.task == original_task