"""FastAPI HTMX app for EPUB search."""

from __future__ import annotations

import logging
from contextlib import asynccontextmanager
from typing import TYPE_CHECKING, Annotated

import typer
import uvicorn
from fastapi import FastAPI
from fastapi.staticfiles import StaticFiles
from sqlalchemy.orm import Session

from python.common import configure_logger
from python.ebook_search.api.bm25_tasks import cancel_bm25_refresh
from python.ebook_search.api.routes import admin_router, page_router, search_router
from python.ebook_search.api.web import STATIC_DIR
from python.ebook_search.bm25_corpus import ensure_bm25_corpus
from python.ebook_search.config import load_config
from python.orm.common import get_postgres_engine

if TYPE_CHECKING:
    from collections.abc import AsyncIterator


logger = logging.getLogger(__name__)


@asynccontextmanager
async def lifespan(app: FastAPI) -> AsyncIterator[None]:
    """Manage application startup and shutdown resources."""
    logger.info("ebook_search_startup")
    app.state.engine = get_postgres_engine(name="RICHIE")
    with Session(app.state.engine) as session:
        ensure_bm25_corpus(session, app.state.config)
    try:
        yield
    finally:
        logger.info("ebook_search_shutdown")
        cancel_bm25_refresh(app)
        app.state.engine.dispose()


def create_app() -> FastAPI:
    """Create the EPUB search web app."""
    app = FastAPI(title="EPUB Search", lifespan=lifespan)
    app.mount("/static", StaticFiles(directory=STATIC_DIR), name="static")
    app.state.config = load_config()
    logger.info(
        "ebook_search_config_loaded top_k=%s embedding_model=%s rerank_enabled=%s answer_enabled=%s library_paths=%s",
        app.state.config.top_k,
        app.state.config.embedding_model,
        app.state.config.rerank.enabled,
        app.state.config.answer_enabled,
        len(app.state.config.library_paths),
    )

    app.include_router(admin_router)
    app.include_router(page_router)
    app.include_router(search_router)

    return app


def serve(
    host: Annotated[str, typer.Option("--host", "-h", help="Host to bind to")] = "127.0.0.1",
    port: Annotated[int, typer.Option("--port", "-p", help="Port to bind to")] = 8070,
    log_level: Annotated[str, typer.Option("--log-level", "-l", help="Log level")] = "INFO",
) -> None:
    """Start the EPUB search server."""
    configure_logger(log_level)
    uvicorn.run(create_app(), host=host, port=port)


if __name__ == "__main__":
    typer.run(serve)