from typing import List, Dict, Any, Optional
from pydantic import BaseModel, Field


class PaperModel(BaseModel):
    """Model for ArXiv paper information."""
    id: str
    title: str
    authors: List[str]
    summary: str
    published: str
    updated: Optional[str] = None
    pdf_url: Optional[str] = None
    categories: List[str] = []
    links: List[str] = []


class DocumentChunkModel(BaseModel):
    """Model for document chunks."""
    id: str
    paper_id: str
    title: str
    authors: str
    published: str
    chunk_index: int
    total_chunks: int
    text: str
    pdf_url: Optional[str] = None
    categories: List[str] = []


class SearchResultModel(BaseModel):
    """Model for search results."""
    document: DocumentChunkModel
    score: float


class QueryRequestModel(BaseModel):
    """Model for RAG query request."""
    query: str
    top_k: int = Field(5, description="Number of documents to retrieve")
    model: Optional[str] = None
    categories: Optional[List[str]] = None


class SearchRequestModel(BaseModel):
    """Model for search request."""
    query: str
    top_k: int = Field(10, description="Number of documents to retrieve")
    categories: Optional[List[str]] = None


class RAGResponseModel(BaseModel):
    """Model for RAG response."""
    query: str
    answer: str
    search_results_markdown: str
    raw_results: List[SearchResultModel]
    processing_time: float
    timestamp: str


class ModelInfoModel(BaseModel):
    """Model for LLM model information."""
    model_name: str
    dimension: int
    max_seq_length: int
    normalize_embeddings: bool


class SystemStatsModel(BaseModel):
    """Model for system statistics."""
    papers_in_cache: int
    total_chunks: int
    vector_db: Dict[str, Any]
    embedding_model: ModelInfoModel
    default_llm_model: str
    available_models: List[str]