"""Tests for ListCommentsUseCase.

This module tests the comment listing use case covering retrieval
of comments by post ID.
"""

from unittest.mock import AsyncMock, Mock
from uuid import uuid4

import pytest

from app.application.use_cases.list_comments import ListCommentsUseCase
from app.domain.entities.comment import Comment


class TestListCommentsUseCase:
    """Tests for ListCommentsUseCase.

    Covers TC-UNIT-835.
    """

    @pytest.mark.asyncio
    async def test_list_comments_by_post(
        self,
        mock_transaction_manager: Mock,
    ) -> None:
        """Test listing comments for a post.

        TC-UNIT-835: Positive — returns comments for given post_id.
        """
        post_id = uuid4()
        author_id = "user-123"

        comments = [
            Comment.create(
                post_id=post_id,
                author_id=author_id,
                content_str="First comment.",
            ),
            Comment.create(
                post_id=post_id,
                author_id="user-456",
                content_str="Second comment.",
            ),
        ]
        mock_comment_repository = AsyncMock()
        mock_comment_repository.get_by_post = AsyncMock(return_value=comments)

        use_case = ListCommentsUseCase(
            comment_repo=mock_comment_repository,
        )

        result = await use_case.execute(post_id=post_id)

        assert len(result) == 2
        assert result[0].post_id == post_id
        assert result[0].author_id == author_id
        assert result[1].author_id == "user-456"
        mock_comment_repository.get_by_post.assert_called_once_with(post_id)