using UnityEngine;
using UnityEngine.Assertions;

namespace RebootKit.Engine.Foundation {
    public interface IDependencyInstaller {
        void Install(DIContext context);
    }

    public abstract class SceneDependencyInstaller : MonoBehaviour, IDependencyInstaller {
        public abstract void Install(DIContext context);
    }

    [DefaultExecutionOrder(-1000)]
    public class SceneContext : MonoBehaviour {
        static readonly Logger s_logger = new Logger(nameof(SceneContext));

        [SerializeField] SceneDependencyInstaller[] m_Installers;
        
        DIContext m_DIContext;

        void Awake() {
            m_DIContext = new DIContext();

            s_logger.Info("Installing scene dependency installers");
            foreach (SceneDependencyInstaller installer in m_Installers) {
                installer.Install(m_DIContext);
            }
            
            foreach (GameObject root in gameObject.scene.GetRootGameObjects()) {
                m_DIContext.InjectGameObject(root);
            }
        }
    }

    public static class DIContextGameObjectEx {
        public static void InjectGameObject(this DIContext context, GameObject gameObject, bool injectChildren = true) {
            Assert.IsNotNull(gameObject);

            Component[] components = injectChildren ? gameObject.GetComponentsInChildren<Component>() : gameObject.GetComponents<Component>();
            foreach (Component component in components) {
                context.Inject(component);
            }
        }
    }
}