tests/python_docker_build_simulator.py

import os
import sys
import importlib

def check_structure():
    print("🐳 Simulating Docker Build Context...")
    
    # 1. Check Root Files
    required = ["app", "requirements.txt", "Dockerfile", ".dockerignore"]
    missing = [f for f in required if not os.path.exists(f)]
    if missing:
        print(f"❌ MISSING FILES: {missing}")
        return False
    else:
        print("✅ Root structure verified.")

    # 2. Check App Directory
    if not os.path.exists("app/main.py"):
        print("❌ app/main.py not found! Uvicorn will fail.")
        return False
    print("✅ app/main.py exists.")

    # 3. Check Dependencies (Top-Level)
    print("🔍 Checking critical imports...")
    try:
        import fastapi
        import uvicorn
        import pydantic
        import tenacity
        import requests
        print("✅ Core dependencies installed.")
    except ImportError as e:
        print(f"⚠️  WARNING: Local environment missing dependency: {e}")
        print("   (This might be fine if Docker installs them, but ensure strict versioning in requirements.txt)")

    return True

if __name__ == "__main__":
    if check_structure():
        print("\n🚀 Ready for 'docker build -t sentinel-honeypot .'")
    else:
        print("\n🛑 Build pre-check FAILED.")
        sys.exit(1)