"""Tornado application entry point and route configuration."""

import os

import click
import tornado.ioloop
import tornado.web

from db import get_engine, get_session_factory, init_db
from handlers.main import MainHandler
from handlers.game import GameHandler
from handlers.howtoplay import HowToPlayHandler
from handlers.about import AboutHandler
from handlers.scoreboard import ScoreboardPageHandler
from handlers.api import (
    CategoriesHandler,
    NewGameHandler,
    GameStateHandler,
    GuessHandler,
    ScoreboardAPIHandler,
)

BASE_DIR = os.path.dirname(os.path.abspath(__file__))


def make_app(session_factory=None, debug=False, prefix="/"):
    """Create and configure the Tornado application.

    Args:
        session_factory: SQLAlchemy session factory. If None, API
            endpoints that require a database will not work.
        debug: Enable debug mode (auto-reload, stack traces).
        prefix: URL prefix for reverse-proxy hosting (e.g. ``/wordsearch/``).

    Returns:
        A configured ``tornado.web.Application`` instance.
    """
    return tornado.web.Application(
        [
            (r"/", MainHandler),
            (r"/game", GameHandler),
            (r"/howtoplay", HowToPlayHandler),
            (r"/about", AboutHandler),
            (r"/scoreboard", ScoreboardPageHandler),
            (r"/api/categories", CategoriesHandler),
            (r"/api/scoreboard", ScoreboardAPIHandler),
            (r"/api/game/new", NewGameHandler),
            (r"/api/game/([^/]+)", GameStateHandler),
            (r"/api/game/([^/]+)/guess", GuessHandler),
        ],
        template_path=os.path.join(BASE_DIR, "templates"),
        static_path=os.path.join(BASE_DIR, "static"),
        session_factory=session_factory,
        base_url=prefix,
        debug=debug,
    )


@click.command()
@click.option("--port", default=8888, type=int, help="Port to listen on.")
@click.option("--debug", is_flag=True, help="Enable debug mode.")
@click.option(
    "--prefix",
    default="/",
    help="URL prefix for reverse-proxy hosting (e.g. /wordsearch/).",
)
def main(port, debug, prefix):
    """Start the web server."""
    if not prefix.startswith("/"):
        prefix = "/" + prefix
    if not prefix.endswith("/"):
        prefix = prefix + "/"

    engine = get_engine()
    init_db(engine)
    session_factory = get_session_factory(engine)
    app = make_app(session_factory=session_factory, debug=debug, prefix=prefix)
    app.listen(port)
    print(f"Server started at http://localhost:{port}")
    tornado.ioloop.IOLoop.current().start()


if __name__ == "__main__":
    main()