import logging

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse

from .api import auth, chat
from .config import settings
from .services.provider_manager import provider_manager

# Setup logging
logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
    handlers=[
        logging.FileHandler('/app/devden.log'),
        logging.StreamHandler()
    ]
)
logger = logging.getLogger(__name__)

app = FastAPI(
    title="DevDen API", description="AI chat backend for DevDen", version="1.0.0"
)

# CORS Configuration
app.add_middleware(
    CORSMiddleware,
    allow_origins=[settings.FRONTEND_URL, "http://localhost:3000"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Include routers
app.include_router(auth.router)
app.include_router(chat.router)


@app.exception_handler(Exception)
async def global_exception_handler(request, exc):
    """Global exception handler to log all errors"""
    logger.error(f"Unhandled exception: {exc}", {
        "url": str(request.url),
        "method": request.method,
        "headers": dict(request.headers),
        "traceback": str(exc)
    })
    return JSONResponse(
        status_code=500,
        content={"detail": "Internal server error"}
    )


@app.get("/health")
async def health_check():
    """Health check endpoint"""
    logger.info("Health check requested")
    return JSONResponse(
        content={
            "status": "healthy",
            "providers": provider_manager.get_available_providers(),
        }
    )


@app.get("/logs")
async def get_logs():
    """Get recent log entries (for debugging)"""
    try:
        with open('/app/devden.log', 'r') as f:
            lines = f.readlines()[-50:]  # Last 50 lines
        return {"logs": lines}
    except Exception as e:
        logger.error(f"Failed to read logs: {e}")
        return {"error": "Failed to read logs"}


@app.on_event("startup")
async def startup_event():
    logger.info("DevDen API starting up...")
    logger.info(f"Available providers: {provider_manager.get_available_providers()}")


@app.on_event("shutdown")
async def shutdown_event():
    logger.info("DevDen API shutting down...")