using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.Reflection;
using GamecraftModdingAPI.Utility;
using HarmonyLib;
using Svelto.Tasks;
using Svelto.Tasks.Lean;
using UnityEngine;
using UnityEngine.AddressableAssets;
using UnityEngine.ResourceManagement.AsyncOperations;

namespace GamecraftModdingAPI.Interface.IMGUI
{
    /// <summary>
    /// Convenient IMGUI values.
    /// </summary>
    public static class Constants
    {
        private static byte _defaultCompletion = 0;
        private static GUISkin _default = null;
        
        /// <summary>
        /// Best-effort imitation of Gamecraft's UI style.
        /// </summary>
        public static GUISkin Default
        {
            get
            {
                if (_defaultCompletion != 0) _default = BuildDefaultGUISkin();
                return _default;
            }
        }

        private static Font _riffic = null;

        private static Texture2D _blueBackground = null;
        private static Texture2D _grayBackground = null;
        private static Texture2D _whiteBackground = null;
        private static Texture2D _textInputBackground = null;
        private static Texture2D _areaBackground = null;

        internal static void Init()
        {
            LoadGUIAssets();
        }

        private static GUISkin BuildDefaultGUISkin()
        {
            _defaultCompletion = 0;
            if (_riffic == null) return GUI.skin;
            // build GUISkin
            GUISkin gui = ScriptableObject.CreateInstance<GUISkin>();
            gui.font = _riffic;
            gui.settings.selectionColor = Color.white;
            gui.settings.tripleClickSelectsLine = true;
            // set properties off all UI elements
            foreach (PropertyInfo p in typeof(GUISkin).GetProperties())
            {
                // for a "scriptable" GUI system, it's ironic there's no better way to do this
                if (p.GetValue(gui) is GUIStyle style)
                {
                    style.richText = true;
                    style.alignment = TextAnchor.MiddleCenter;
                    style.fontSize = 30;
                    style.wordWrap = true;
                    style.border = new RectOffset(4, 4, 4, 4);
                    style.margin = new RectOffset(4, 4, 4, 4);
                    style.padding = new RectOffset(4, 4, 4, 4);
                    // normal state
                    style.normal.background = _blueBackground;
                    style.normal.textColor = Color.white;
                    // hover state
                    style.hover.background = _grayBackground;
                    style.hover.textColor = Color.white;
                    // focused
                    style.focused.background = _grayBackground;
                    style.focused.textColor = Color.white;
                    // clicking state
                    style.active.background = _whiteBackground;
                    style.active.textColor = Color.white;
                    
                    p.SetValue(gui, style); // probably unnecessary
                }
            }
            // set element-specific styles
            // label
            gui.label.normal.background = null;
            gui.label.hover.background = null;
            gui.label.focused.background = null;
            gui.label.active.background = null;
            // text input
            gui.textField.normal.background = _textInputBackground;
            gui.textField.hover.background = _textInputBackground;
            gui.textField.focused.background = _textInputBackground;
            gui.textField.active.background = _textInputBackground;
            // text area
            gui.textArea.normal.background = _textInputBackground;
            gui.textArea.hover.background = _textInputBackground;
            gui.textArea.focused.background = _textInputBackground;
            gui.textArea.active.background = _textInputBackground;
            // window
            gui.window.normal.background = _areaBackground;
            gui.window.hover.background = _areaBackground;
            gui.window.focused.background = _areaBackground;
            gui.window.active.background = _areaBackground;
            // box (also used by layout groups & areas)
            gui.box.normal.background = _areaBackground;
            gui.box.hover.background = _areaBackground;
            gui.box.focused.background = _areaBackground;
            gui.box.active.background = _areaBackground;
            return gui;
        }

        private static void LoadGUIAssets()
        {
            AsyncOperationHandle<Font> rifficHandle = Addressables.LoadAssetAsync<Font>("Assets/Art/Fonts/riffic-bold.ttf");
            rifficHandle.Completed += handle =>
            {
                _riffic = handle.Result;
                _defaultCompletion++;
            };
            _blueBackground = new Texture2D(1, 1);
            _blueBackground.SetPixel(0, 0, new Color(0.004f, 0.522f, 0.847f) /* Gamecraft Blue */);
            _blueBackground.Apply();
            _grayBackground = new Texture2D(1, 1);
            _grayBackground.SetPixel(0, 0, new Color(0.745f, 0.745f, 0.745f) /* Gray */);
            _grayBackground.Apply();
            _whiteBackground = new Texture2D(1, 1);
            _whiteBackground.SetPixel(0, 0, new Color(0.898f, 0.898f, 0.898f) /* Very light gray */);
            _whiteBackground.Apply();
            _textInputBackground = new Texture2D(1, 1);
            _textInputBackground.SetPixel(0, 0, new Color(0f, 0f, 0f, 0.25f) /* Translucent gray */);
            _textInputBackground.Apply();
            _areaBackground = new Texture2D(1, 1);
            _areaBackground.SetPixel(0, 0, new Color(0f, 0f, 0f, 0.25f) /* Translucent gray */);
            _areaBackground.Apply();
            /* // this is actually gray (used for the loading screen)
            AsyncOperationHandle<Texture2D> backgroundHandle =
                Addressables.LoadAssetAsync<Texture2D>("Assets/Art/Textures/UI/FrontEndMap/RCX_Blue_Background_5k.jpg");
            backgroundHandle.Completed += handle =>
            {
                _blueBackground = handle.Result;
                _defaultCompletion++;
            };*/
            _defaultCompletion++;
        }
    }
}