"""DTOs for comment use cases.

This module defines Data Transfer Objects used for communication between
application layer comment use cases and presentation layer.
"""

from dataclasses import dataclass
from datetime import datetime
from uuid import UUID


@dataclass(frozen=True)
class CreateCommentDTO:
    """DTO for creating a comment.

    Carries comment creation data from API to use case.

    Attributes:
        post_id: UUID of the post to comment on.
        author_id: Identifier of the comment author.
        content: Comment content string (Markdown supported).
        parent_id: Optional UUID of parent comment for replies.
    """

    post_id: UUID
    author_id: str
    content: str
    parent_id: UUID | None = None


@dataclass(frozen=True)
class CommentResponseDTO:
    """DTO for comment response.

    Carries complete comment data for API responses.

    Attributes:
        id: Unique comment identifier.
        post_id: UUID of the parent post.
        author_id: Comment author identifier.
        content: Comment content string.
        parent_id: Optional UUID of parent comment.
        like_count: Number of likes on this comment.
        created_at: Creation timestamp.
        updated_at: Last update timestamp.
    """

    id: UUID
    post_id: UUID
    author_id: str
    content: str
    parent_id: UUID | None = None
    like_count: int = 0
    created_at: datetime | None = None
    updated_at: datetime | None = None