"""
FastAPI main application entry point.

Job ID: MTAD-IMPL-2025-11-18-CL
"""

import logging
from contextlib import asynccontextmanager
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from app.config import settings
from app.database import init_db, close_db
from app.api.v1 import api_router

# Configure logging
logging.basicConfig(
    level=settings.log_level,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
)
logger = logging.getLogger(__name__)


@asynccontextmanager
async def lifespan(app: FastAPI):
    """Lifespan context manager for startup and shutdown events."""
    # Startup
    logger.info("Starting MoreThanADiagnosis API")
    await init_db()
    logger.info("Database initialized")
    yield
    # Shutdown
    logger.info("Shutting down MoreThanADiagnosis API")
    await close_db()
    logger.info("Database connections closed")


# Create FastAPI app
app = FastAPI(
    title=settings.api_title,
    description=settings.api_description,
    version=settings.api_version,
    lifespan=lifespan,
)

# Add CORS middleware
app.add_middleware(
    CORSMiddleware,
    allow_origins=settings.cors_origins,
    allow_credentials=settings.cors_credentials,
    allow_methods=settings.cors_methods,
    allow_headers=settings.cors_headers,
)

# Include API routes
app.include_router(api_router, prefix=f"/api/{settings.api_version}")


# Health check endpoint
@app.get("/health", tags=["Health"])
async def health_check():
    """Health check endpoint for uptime monitoring."""
    return {
        "status": "healthy",
        "version": settings.api_version,
        "env": settings.env,
    }


@app.get("/", tags=["Root"])
async def root():
    """Root endpoint."""
    return {
        "service": settings.api_title,
        "version": settings.api_version,
        "docs": "/docs",
        "redoc": "/redoc",
    }


if __name__ == "__main__":
    import uvicorn
    uvicorn.run(
        "app.main:app",
        host="0.0.0.0",
        port=8000,
        reload=settings.debug,
        log_level=settings.log_level.lower(),
    )