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

public static class NodeEditorPreferences {

    /// <summary> Have we loaded the prefs yet </summary>
    private static bool prefsLoaded = false;

    private static Dictionary<string, Color> typeColors;
	private static Dictionary<string, Color> generatedTypeColors;

    [PreferenceItem ("Node Editor")]
    private static void PreferencesGUI () {
        if (!prefsLoaded) LoadPrefs();
		EditorGUILayout.LabelField("Type colors", EditorStyles.boldLabel);

		string[] typeKeys = new string[typeColors.Count];
		typeColors.Keys.CopyTo(typeKeys, 0);


        foreach (var key in typeKeys) {
            EditorGUILayout.BeginHorizontal ();
            Color col = typeColors[key];
            col = EditorGUILayout.ColorField (key, col);
			typeColors[key] = col;
			if (!GUILayout.Toggle(true, "")) {
				typeColors.Remove(key);
				SavePrefs();
			}
            EditorGUILayout.EndHorizontal ();
        }
		if(GUI.changed) {
			SavePrefs();
		}


		string[] generatedTypeKeys = new string[generatedTypeColors.Count];
		generatedTypeColors.Keys.CopyTo(generatedTypeKeys,0);
		foreach (var key in generatedTypeKeys) {
            EditorGUILayout.BeginHorizontal ();
            Color col = generatedTypeColors[key];
			EditorGUI.BeginDisabledGroup(true);
            col = EditorGUILayout.ColorField (key, col);
			EditorGUI.EndDisabledGroup();
			if (GUILayout.Toggle(false, "")) {
				typeColors.Add(key,generatedTypeColors[key]);
				generatedTypeColors.Remove(key);
				SavePrefs();
			}
            EditorGUILayout.EndHorizontal ();
        }
    }

	private static void LoadPrefs() {
		generatedTypeColors = new Dictionary<string, Color>();
		typeColors = GetTypeColors();
        prefsLoaded = true;
	}

	private static void SavePrefs() {
		if (!prefsLoaded) return;
		string s = "";
		foreach (var item in typeColors) {
            s+= item.Key+","+ColorUtility.ToHtmlStringRGB(item.Value)+ ",";
        }
		EditorPrefs.SetString("unec_typecolors",s);
	}

    public static void SetDefaultTypeColors () {
        EditorPrefs.SetString ("unec_typecolors", "int,2568CA,string,CE743A,bool,00FF00");
    }

	public static Dictionary<string, Color> GetTypeColors () {
		if (prefsLoaded) return typeColors;
        if (!EditorPrefs.HasKey ("unec_typecolors")) SetDefaultTypeColors ();
		string[] data = EditorPrefs.GetString("unec_typecolors").Split(new char[] {','}, StringSplitOptions.RemoveEmptyEntries);
		Dictionary<string, Color> dict = new Dictionary<string, Color> ();
        for (int i = 0; i < data.Length; i += 2) {
            Color col;
            if (ColorUtility.TryParseHtmlString("#"+data[i+1], out col)) {
                dict.Add(data[i], col);
            }
        }
		return dict;
	}

	/// <summary> Return color based on type </summary>
	public static Color GetTypeColor(System.Type type) {
		if (!prefsLoaded) LoadPrefs();
        if (type == null) return Color.gray;
        if (typeColors.ContainsKey(type.Name)) return typeColors[type.Name];
        if (generatedTypeColors.ContainsKey(type.Name)) return generatedTypeColors[type.Name];
        UnityEngine.Random.InitState (type.Name.GetHashCode ());
		generatedTypeColors.Add(type.Name, new Color (UnityEngine.Random.value, UnityEngine.Random.value, UnityEngine.Random.value));
        return generatedTypeColors[type.Name];
	}
}