"""Pydantic request/response schemas."""
from typing import List, Optional

from pydantic import BaseModel, Field


class DocumentSummary(BaseModel):
    id: str
    filename: str
    content_type: str
    num_chunks: int
    num_chars: int
    ocr_used: bool
    created_at: str


class IngestResponse(BaseModel):
    document: DocumentSummary
    message: str


class ChatRequest(BaseModel):
    question: str = Field(..., min_length=1)
    # Optionally restrict retrieval to specific uploaded documents.
    document_ids: Optional[List[str]] = None
    top_k: Optional[int] = None


class Source(BaseModel):
    document_id: str
    filename: str
    chunk_index: int
    score: float
    snippet: str


class ChatResponse(BaseModel):
    answer: str
    sources: List[Source]