from typing import List, Dict, Any

from pydantic import BaseModel, Field


class ChatRequest(BaseModel):
    message: str = Field(..., min_length=1)
    history: List[Dict[str, str]] = Field(default_factory=list)
    session_id: str | None = Field(default=None, description="Unique session identifier for chat persistence")


class ChatResponse(BaseModel):
    reply: str
    retrieved_chunks: List[Dict[str, Any]] = Field(default_factory=list)


class HealthResponse(BaseModel):
    status: str
    docs_loaded: bool
    index_ready: bool
    chunk_count: int
    index_path: str


class SessionUpdateNameRequest(BaseModel):
    session_id: str
    user_name: str


class SessionInitRequest(BaseModel):
    session_id: str
    user_name: str | None = Field(default=None, description="User name to associate with the session at creation time")

class RateRequest(BaseModel):
    session_id: str
    rating: int = Field(..., ge=1, le=5)
    chat_id: int | None = Field(default=None, description="Chat thread to rate; resolved server-side if omitted")

class PollRequest(BaseModel):
    session_id: str
    last_id: int = Field(default=0)

class ResetRequest(BaseModel):
    session_id: str

class DeleteChatRequest(BaseModel):
    session_id: str