# app/main.py
"""FastAPI application factory for pagepiper."""
from __future__ import annotations

import logging
from contextlib import asynccontextmanager

from fastapi import FastAPI

from app.config import DB_PATH
from app.services.bm25_index import BM25Index

logger = logging.getLogger("pagepiper")

# Module-level BM25 singleton — shared across all requests
_bm25 = BM25Index()


def _apply_migrations() -> None:
    from scripts.db_migrate import migrate
    migrate(DB_PATH)


@asynccontextmanager
async def lifespan(app: FastAPI):
    _apply_migrations()
    _bm25.mark_dirty()  # will rebuild on first search
    yield


app = FastAPI(title="Pagepiper", lifespan=lifespan)

# Wire BM25 dirty callback into library router
from app.api import library as _lib_module  # noqa: E402
_lib_module._mark_bm25_dirty = _bm25.mark_dirty

# Register routers
from app.api.library import router as library_router  # noqa: E402
from app.api.ingest import router as ingest_router  # noqa: E402
from app.api.search import router as search_router  # noqa: E402
from app.api.chat import router as chat_router  # noqa: E402

app.include_router(library_router)
app.include_router(ingest_router)
app.include_router(search_router)
app.include_router(chat_router)