"""
Application Layer - DTOs (Data Transfer Objects)
"""
from dataclasses import dataclass
from typing import List, Optional
from uuid import UUID


@dataclass
class QueryDTO:
    """Query data transfer object"""

    query_text: str
    department: str
    user_id: Optional[str] = None
    session_id: Optional[str] = None
    top_k: int = 10
    temperature: float = 0.7
    max_tokens: int = 2048
    filters: dict = None

    def __post_init__(self) -> None:
        if self.filters is None:
            self.filters = {}


@dataclass
class SourceDTO:
    """Source citation DTO"""

    title: str
    content: str
    relevance_score: float
    document_id: str
    chunk_index: int
    metadata: dict


@dataclass
class QueryResponseDTO:
    """Query response DTO"""

    query_id: str
    answer: str
    sources: List[SourceDTO]
    confidence: float
    processing_time_ms: int
    tokens_used: int
    model: str


@dataclass
class DocumentUploadDTO:
    """Document upload DTO"""

    filename: str
    content: bytes
    department: str
    metadata: dict = None

    def __post_init__(self) -> None:
        if self.metadata is None:
            self.metadata = {}


@dataclass
class DocumentDTO:
    """Document DTO"""

    id: str
    title: str
    filename: str
    file_type: str
    file_size: int
    department: str
    status: str
    uploaded_at: str
    indexed_at: Optional[str] = None
    metadata: dict = None