using System;
using System.Collections.Generic;
using UnityEditor;
using UnityEditor.Rendering;
using UnityEngine;

namespace Misaki.ShaderGUI.Packages
{
    public abstract class MaterialUIBlock<TExpandableBit> : IMaterialUIScope where TExpandableBit : Enum, IConvertible
    {
        protected readonly MaterialPropertyContainer propertyContainer = new();

        protected MaterialEditor editor;
        protected IMaterialUIScopeContainer owner;

        protected virtual bool ShowSection => true;
        protected virtual bool IsSubHeader => false;
        protected virtual bool SpaceAtEnd => true;
        protected virtual string DocumentationURL => string.Empty;

        protected abstract TExpandableBit ExpandableBit
        {
            get;
        }

        protected abstract GUIContent Header
        {
            get;
        }

        public MaterialEditor Editor => editor;

        public abstract void LoadMaterialProperties(MaterialPropertyContainer propertyContainer);

        protected abstract void DrawContent();

        public void Initialize(MaterialEditor materialEditor, IEnumerable<MaterialProperty> properties, IMaterialUIScopeContainer container)
        {
            editor = materialEditor;
            owner = container;

            LoadMaterialProperties(propertyContainer);
            UpdateMaterialProperties(properties);
        }

        public void UpdateMaterialProperties(IEnumerable<MaterialProperty> properties)
        {
            propertyContainer.ReloadProperties(properties);
        }

        public void Draw()
        {
            if (!ShowSection)
            {
                return;
            }

            using var scope = new MaterialHeaderScope(Header, Convert.ToUInt32(ExpandableBit), editor, spaceAtEnd: SpaceAtEnd, subHeader: IsSubHeader, documentationURL: DocumentationURL);
            if (scope.expanded)
            {
                DrawContent();
            }
        }
    }
}