from contextlib import asynccontextmanager
from typing import Union, Annotated
from models import  Event
from fastapi import FastAPI, Request, Depends
from fastapi.templating import Jinja2Templates
from fastapi.staticfiles import StaticFiles
from sqlmodel import Field, Session, SQLModel, create_engine, select

sqlite_file_name = "database.db"
sqlite_url = f"sqlite:///{sqlite_file_name}"

connect_args = {"check_same_thread": False}
engine = create_engine(sqlite_url, connect_args=connect_args)

def get_session():
    with Session(engine) as session:
        yield session

def create_db_and_tables():
    SQLModel.metadata.create_all(engine)

@asynccontextmanager
async def on_startup(app_: FastAPI):
    create_db_and_tables()
    yield

app = FastAPI(lifespan=on_startup)
app.mount("/static", StaticFiles(directory="static"), name="static")

templates = Jinja2Templates(directory="templates")


SessionDep = Annotated[Session, Depends(get_session)]

@app.get("/")
async def read_root(request: Request, session: SessionDep):
    statement = select(Event).order_by(Event.event_time)
    events = session.exec(statement).all()
    return templates.TemplateResponse(
        request=request, name="index.html", context={"events": events}
    )

@app.get("/event/{event_id}")
async def read_event(request: Request, event_id: int, session: SessionDep):
    statement = select(Event).where(Event.id == event_id)
    event = session.exec(statement).one()
    return templates.TemplateResponse(
        request=request, name="event.html", context={"event": event}
    )