using System;
using System.Collections.Generic;
using System.Linq;
using UnityEditor;
using UnityEngine;
using XNode;

namespace XNodeEditor {
    /// <summary> Base class to derive custom Node editors from. Use this to create your own custom inspectors and editors for your nodes. </summary>
    public class NodeEditor {

        /// <summary> Fires every whenever a node was modified through the editor </summary>
        public static Action<Node> onUpdateNode;
        public Node target;
        public SerializedObject serializedObject;
        public static Dictionary<NodePort, Vector2> portPositions;

        /// <summary> Draws the node GUI.</summary>
        /// <param name="portPositions">Port handle positions need to be returned to the NodeEditorWindow </param>
        public void OnNodeGUI() {
            OnHeaderGUI();
            OnBodyGUI();
        }

        public virtual void OnHeaderGUI() {
            GUI.color = Color.white;
            string title = NodeEditorUtilities.PrettifyCamelCase(target.name);
            GUILayout.Label(title, NodeEditorResources.styles.nodeHeader, GUILayout.Height(30));
        }

        /// <summary> Draws standard field editors for all public fields </summary>
        public virtual void OnBodyGUI() {
            string[] excludes = { "m_Script", "graph", "position", "ports" };
            portPositions = new Dictionary<NodePort, Vector2>();

            SerializedProperty iterator = serializedObject.GetIterator();
            bool enterChildren = true;
            EditorGUIUtility.labelWidth = 84;
            while (iterator.NextVisible(enterChildren)) {
                enterChildren = false;
                if (excludes.Contains(iterator.name)) continue;
                NodeEditorGUILayout.PropertyField(iterator, true);
            }
        }

        public virtual int GetWidth() {
            return 200;
        }

        public virtual Color GetTint() {
            Type type = target.GetType();
            if (NodeEditorWindow.nodeTint.ContainsKey(type)) return NodeEditorWindow.nodeTint[type];
            else return Color.white;
        }
    }

    [AttributeUsage(AttributeTargets.Class)]
    public class CustomNodeEditorAttribute : Attribute {
        public Type inspectedType { get { return _inspectedType; } }
        private Type _inspectedType;
        /// <summary> Tells a NodeEditor which Node type it is an editor for </summary>
        /// <param name="inspectedType">Type that this editor can edit</param>
        /// <param name="contextMenuName">Path to the node</param>
        public CustomNodeEditorAttribute(Type inspectedType) {
            _inspectedType = inspectedType;
        }
    }
}