import asyncio
import os
from contextlib import asynccontextmanager
from threading import Thread

from alembic import command
from alembic.config import Config
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import RedirectResponse

from src.config import DatabaseConfig, logger
from src.controllers import api_router

from src.models import Base


def run_upgrade(connection, alembic_config: Config):
    alembic_config.attributes["connection"] = connection
    command.upgrade(alembic_config, "head")


async def run_migrations():
    logger.info("Running migrations if any...")
    alembic_config = Config("alembic.ini")
    alembic_config.set_main_option(
        "sqlalchemy.url", os.getenv("SQLALCHEMY_DATABASE_URI")
    )
    async with DatabaseConfig.get_engine().begin() as session:
        await session.run_sync(run_upgrade, alembic_config)


@asynccontextmanager
async def lifespan(app: FastAPI):
    try:
        logger.info("Starting up the application...")
        await run_migrations()
        logger.info("Application started successfully...")
        yield
    except Exception as e:
        logger.error(f"Error during startup: {str(e)}")
        raise
    finally:
        logger.info("Shutting down the application...")
        logger.info("Application shutdown complete.")


app = FastAPI(lifespan=lifespan)


app.add_middleware(
    CORSMiddleware,
    # allow_origins=os.getenv(
    #     "CORS_ALLOW_ORIGINS", "http://localhost, http://127.0.0.1"
    # ).split(", "),
    allow_origins=["*"],
    allow_credentials=False,
    allow_methods=["*"],
    allow_headers=["*"],
)


@app.get("/")
async def check_health():
    return RedirectResponse(url="/docs")

@app.delete("/api/v1/database")
async def delete_all_data():
    async with DatabaseConfig.get_engine().begin() as session:
        await session.run_sync(Base.metadata.drop_all)
        await session.run_sync(Base.metadata.create_all)
    return {"response": "All data deleted successfully!"}

app.include_router(api_router, prefix="/api/v1")