import asyncio
import platform
from fastapi import FastAPI, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse
from app.core.config import settings
from app.api.api_v1.api import api_router
from app.db.database import init_db
import logging
import sys

# Configure Windows-specific event loop policy
if platform.system() == 'Windows':
    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())

# Configure detailed logging
logging.basicConfig(
    level=logging.DEBUG,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
    stream=sys.stdout
)
logger = logging.getLogger(__name__)

app = FastAPI(
    title=settings.PROJECT_NAME,
    openapi_url=f"{settings.API_V1_STR}/openapi.json"
)

# Configure CORS
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"]
)

# Include API router
app.include_router(api_router, prefix=settings.API_V1_STR)

@app.exception_handler(HTTPException)
async def http_exception_handler(request, exc):
    return JSONResponse(
        status_code=exc.status_code,
        content={"detail": exc.detail}
    )

@app.get("/")
async def root():
    return {"message": "POS Backend API", "version": "1.0.0"}

@app.on_event("startup")
async def startup_event():
    try:
        logger.info("Starting application initialization...")
        await init_db()
        logger.info("Database initialized successfully")
    except Exception as e:
        logger.error(f"Failed to initialize database: {str(e)}", exc_info=True)
        raise

if __name__ == "__main__":
    import uvicorn
    logger.info("Starting application with Windows-compatible event loop...")
    uvicorn.run("main:app", host="0.0.0.0", port=7860, reload=True, log_level="debug")