from contextlib import asynccontextmanager
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware

from app.core.config import settings
from app.core.database import init_db
from app.api.router import api_router


@asynccontextmanager
async def lifespan(app: FastAPI):
    """Application lifespan handler."""
    # Startup
    # Note: In production, use Alembic migrations instead of init_db
    # await init_db()
    yield
    # Shutdown
    pass


app = FastAPI(
    title=settings.APP_NAME,
    description="A troubleshooting decision tree application for MSP engineers",
    version="1.0.0",
    docs_url="/api/docs",
    redoc_url="/api/redoc",
    openapi_url="/api/openapi.json",
    lifespan=lifespan
)

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

# Include API router
app.include_router(api_router, prefix=settings.API_V1_PREFIX)


@app.get("/")
async def root():
    """Root endpoint."""
    return {
        "message": "Troubleshooting Decision Tree API",
        "docs": "/api/docs",
        "version": "1.0.0"
    }


@app.get("/health")
async def health_check():
    """Health check endpoint."""
    return {"status": "healthy"}