"""
Tests for TaskList CRDT functionality.
"""

import pytest
import pytest_asyncio

# Import x0x types
from x0x import TaskId, TaskItem, TaskList


class TestTaskId:
    """Test TaskId type."""

    def test_from_hex_valid(self):
        """Test creating TaskId from valid hex string."""
        hex_str = "a" * 64
        task_id = TaskId.from_hex(hex_str)
        assert task_id.to_hex() == hex_str

    def test_from_hex_roundtrip(self):
        """Test hex encoding roundtrip."""
        hex_str = "0123456789abcdef" * 4
        task_id = TaskId.from_hex(hex_str)
        assert task_id.to_hex() == hex_str

    def test_from_hex_invalid_chars(self):
        """Test from_hex raises on invalid hex characters."""
        with pytest.raises(ValueError, match="Invalid hex string"):
            TaskId.from_hex("zzzz" * 16)

    def test_from_hex_wrong_length(self):
        """Test from_hex raises on wrong length."""
        with pytest.raises(ValueError, match="must be 32 bytes"):
            TaskId.from_hex("abcd")

    def test_str_repr(self):
        """Test string representations."""
        hex_str = "f" * 64
        task_id = TaskId.from_hex(hex_str)

        # __str__ returns hex
        assert str(task_id) == hex_str

        # __repr__ includes type name
        assert repr(task_id) == f"TaskId('{hex_str}')"

    def test_equality(self):
        """Test TaskId equality comparison."""
        hex_str = "1234" * 16
        task_id1 = TaskId.from_hex(hex_str)
        task_id2 = TaskId.from_hex(hex_str)

        assert task_id1 == task_id2

    def test_inequality(self):
        """Test TaskId inequality."""
        task_id1 = TaskId.from_hex("a" * 64)
        task_id2 = TaskId.from_hex("b" * 64)

        assert task_id1 != task_id2

    def test_hash(self):
        """Test TaskId can be hashed for use in sets/dicts."""
        task_id1 = TaskId.from_hex("a" * 64)
        task_id2 = TaskId.from_hex("a" * 64)
        task_id3 = TaskId.from_hex("b" * 64)

        # Same TaskIds hash to same value
        assert hash(task_id1) == hash(task_id2)

        # Can use in set
        task_set = {task_id1, task_id2, task_id3}
        assert len(task_set) == 2  # task_id1 and task_id2 are duplicates

    def test_hash_in_dict(self):
        """Test TaskId can be used as dict key."""
        task_id = TaskId.from_hex("c" * 64)
        task_dict = {task_id: "value"}

        assert task_dict[task_id] == "value"


class TestTaskItem:
    """Test TaskItem type."""

    def test_task_item_properties(self):
        """Test TaskItem has expected properties."""
        # Note: TaskItem is typically created by Rust code (from_snapshot),
        # but we can't easily construct one in Python tests.
        # This test documents the expected properties.

        # Expected properties (read-only):
        # - id: str (hex-encoded TaskId)
        # - title: str
        # - description: str
        # - status: str ("empty", "claimed", "done")
        # - assignee: Optional[str] (hex AgentId if claimed/done)
        # - priority: int (0-255)

        # Will be tested via list_tasks() integration test
        pass


# Note: The following TaskList tests are placeholders because the underlying
# Rust TaskListHandle currently returns errors (not yet implemented - waiting
# for Phase 1.4). These tests will pass once Phase 1.4 is complete.
#
# For now, we test that:
# 1. Methods exist and have correct signatures
# 2. Invalid input raises appropriate errors
# 3. Methods return coroutines (are async)


class TestTaskListAddTask:
    """Test TaskList.add_task() method."""

    @pytest.mark.asyncio
    async def test_add_task_placeholder(self):
        """Test add_task method exists and is async.

        Currently raises RuntimeError due to placeholder implementation.
        Will work when Phase 1.4 (CRDT Task Lists) is complete.
        """
        # We can't easily construct a TaskList without a real Agent/Handle,
        # so this test is a placeholder for documentation.
        #
        # Expected behavior once implemented:
        # task_list = TaskList.from_handle(mock_handle)
        # task_id = await task_list.add_task("Test task", "Description")
        # assert isinstance(task_id, str)
        # assert len(task_id) == 64  # hex-encoded 32 bytes
        pass


class TestTaskListClaimTask:
    """Test TaskList.claim_task() method."""

    @pytest.mark.asyncio
    async def test_claim_task_placeholder(self):
        """Test claim_task method exists and is async.

        Currently raises RuntimeError due to placeholder implementation.
        Will work when Phase 1.4 (CRDT Task Lists) is complete.
        """
        pass


class TestTaskListCompleteTask:
    """Test TaskList.complete_task() method."""

    @pytest.mark.asyncio
    async def test_complete_task_placeholder(self):
        """Test complete_task method exists and is async.

        Currently raises RuntimeError due to placeholder implementation.
        Will work when Phase 1.4 (CRDT Task Lists) is complete.
        """
        pass


class TestTaskListListTasks:
    """Test TaskList.list_tasks() method."""

    @pytest.mark.asyncio
    async def test_list_tasks_placeholder(self):
        """Test list_tasks method exists and is async.

        Currently raises RuntimeError due to placeholder implementation.
        Will work when Phase 1.4 (CRDT Task Lists) is complete.

        Expected behavior once implemented:
        - Returns list[TaskItem]
        - Each TaskItem has id, title, description, status, assignee, priority
        - status is one of: "empty", "claimed", "done"
        """
        pass


class TestTaskListReorder:
    """Test TaskList.reorder() method."""

    @pytest.mark.asyncio
    async def test_reorder_placeholder(self):
        """Test reorder method exists and is async.

        Currently raises RuntimeError due to placeholder implementation.
        Will work when Phase 1.4 (CRDT Task Lists) is complete.
        """
        pass


# Integration tests (when Phase 1.4 is complete)
class TestTaskListIntegration:
    """Integration tests for full TaskList workflow.

    These will work when Phase 1.4 (CRDT Task Lists) is complete.
    """

    @pytest.mark.asyncio
    async def test_full_workflow_placeholder(self):
        """Test complete workflow: add -> claim -> complete -> list.

        Expected workflow once implemented:

        ```python
        # Create task list (via Agent)
        agent = await Agent.builder().build()
        task_list = await agent.create_task_list("My Tasks")

        # Add task
        task_id = await task_list.add_task("Fix bug", "Network timeout")

        # Claim task
        await task_list.claim_task(task_id)

        # Complete task
        await task_list.complete_task(task_id)

        # List tasks
        tasks = await task_list.list_tasks()
        assert len(tasks) == 1
        assert tasks[0].id == task_id
        assert tasks[0].status == "done"
        assert tasks[0].title == "Fix bug"
        ```
        """
        pass

    @pytest.mark.asyncio
    async def test_concurrent_claims_placeholder(self):
        """Test OR-Set semantics for concurrent claims.

        When two agents claim the same task simultaneously, the CRDT
        should resolve the conflict deterministically.

        This will be testable when Phase 1.4 is complete.
        """
        pass
