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

namespace Misaki.ShaderGUI
{
    public abstract class MaterialUIScope<TExpandableBit> : IMaterialUIScope where TExpandableBit : Enum, IConvertible
    {
        protected MaterialEditor editor;
        protected IEnumerable<MaterialProperty> materialProperties;
        protected IMaterialUIScopeContainer owner;
        protected ReadOnlyCollection<Material> materials;

        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;

        protected abstract void LoadMaterialProperties();

        protected abstract void DrawContent();

        public void Initialize(MaterialEditor materialEditor, IEnumerable<MaterialProperty> properties, IMaterialUIScopeContainer container)
        {
            editor = materialEditor;
            materialProperties = properties;
            owner = container;
            materials = editor.GetMaterials().ToList().AsReadOnly();

            UpdateMaterialProperties(properties);
        }

        public MaterialProperty FindProperty(string propertyName)
        {
            if (materialProperties == null)
            {
                throw new Exception("Material properties are not initialized.");
            }

            if (string.IsNullOrEmpty(propertyName))
            {
                throw new ArgumentException("Property name cannot be null or empty.", nameof(propertyName));
            }

            return materialProperties.First(p => p.name == propertyName);
        }

        public void UpdateMaterialProperties(IEnumerable<MaterialProperty> properties)
        {
            materialProperties = properties;
            LoadMaterialProperties();
        }

        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();
            }
        }
    }
}