"""Chat session management endpoints."""

from typing import List, Optional

from fastapi import APIRouter, Depends, HTTPException
from fastapi.responses import PlainTextResponse
from pydantic import BaseModel

router = APIRouter(prefix="/api/sessions")


class CreateSessionRequest(BaseModel):
    title: str = "New Chat"
    document_ids: Optional[List[str]] = None


def get_chat_store():
    from core.bootstrap import get_chat_store as _get
    return _get()


@router.get("")
async def list_sessions(store=Depends(get_chat_store)):
    sessions = store.list_sessions()
    return {"sessions": sessions}


@router.post("")
async def create_session(request: CreateSessionRequest, store=Depends(get_chat_store)):
    session = store.create_session(request.title, request.document_ids)
    return session


@router.get("/{session_id}/messages")
async def get_messages(session_id: str, store=Depends(get_chat_store)):
    messages = store.get_messages(session_id)
    return {"messages": messages}


@router.post("/{session_id}/export")
async def export_session(session_id: str, store=Depends(get_chat_store)):
    content = store.export_session(session_id)
    if not content:
        raise HTTPException(status_code=404, detail="Session not found")
    return PlainTextResponse(content, media_type="text/plain")