#region Copyright RenGuiYou. All rights reserved.
//=====================================================
// NeatlyFrameWork
// Author:      RenGuiyou
// Feedback: 	mailto:750539605@qq.com
//=====================================================
#endregion

using System.Collections.Generic;
using UnityEngine;

namespace Neatly.UI
{
    internal static class NFontUpdateTracker
    {
        static Dictionary<Font, List<NText>> m_Tracked = new Dictionary<Font, List<NText>>();

        public static void TrackText(NText t)
        {
            if (t.font == null)
                return;

            List<NText> exists;
            m_Tracked.TryGetValue(t.font, out exists);
            if (exists == null)
            {
                if (m_Tracked.Count == 0)
                    Font.textureRebuilt += RebuildForFont;

                exists = new List<NText>();
                m_Tracked.Add(t.font, exists);
            }

            if (!exists.Contains(t))
                exists.Add(t);
        }

        private static void RebuildForFont(Font f)
        {
            List<NText> texts;
            m_Tracked.TryGetValue(f, out texts);

            if (texts == null)
                return;
            for (int i = 0; i < texts.Count; i++)
            {
                texts[i].FontTextureChanged();
            }
        }

        public static void UntrackText(NText t)
        {
            if (t.font == null)
                return;

            List<NText> texts;
            m_Tracked.TryGetValue(t.font, out texts);

            if (texts == null)
                return;

            texts.Remove(t);

            if (texts.Count == 0)
            {
                m_Tracked.Remove(t.font);

                if (m_Tracked.Count == 0)
                    Font.textureRebuilt -= RebuildForFont;
            }
        }
    }
}