using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using UnityEngine;

namespace NewHorizons.Utility.DebugUtilities
{
    class DebugMenuPropPlacer : DebugSubmenu
    {
        private Vector2 recentPropsScrollPosition = Vector2.zero;
        private HashSet<string> favoriteProps = new HashSet<string>();
        public static readonly char separatorCharacter = '☧'; // since no chars are illegal in game object names, I picked one that's extremely unlikely to be used to be a separator
        private static readonly string favoritePropsPlayerPrefKey = "FavoriteProps";

        internal override string SubmenuName()
        {
            return "Prop Placer";
        }

        internal override void OnAwake(DebugMenu menu)
        {
            LoadFavoriteProps();
        }

        private void LoadFavoriteProps()
        {
            string favoritePropsPlayerPref = PlayerPrefs.GetString(favoritePropsPlayerPrefKey);

            if (favoritePropsPlayerPref == null || favoritePropsPlayerPref == "") return;

            var favoritePropPaths = favoritePropsPlayerPref.Split(separatorCharacter);
            foreach (string favoriteProp in favoritePropPaths)
            {
                DebugPropPlacer.RecentlyPlacedProps.Add(favoriteProp);
                this.favoriteProps.Add(favoriteProp);
            }
        }

        internal override void OnGUI(DebugMenu menu)
        {
            //
            // DebugPropPlacer
            // 
            GUILayout.Label("Currently placing: ");
            menu._dpp.SetCurrentObject(GUILayout.TextArea(menu._dpp.currentObject));

            GUILayout.Space(5);

            // List of recently placed objects
            GUILayout.Label("Recently placed objects");
            recentPropsScrollPosition = GUILayout.BeginScrollView(recentPropsScrollPosition, GUILayout.Width(menu.EditorMenuSize.x), GUILayout.Height(500));
            foreach (string propPath in DebugPropPlacer.RecentlyPlacedProps)
            {
                GUILayout.BeginHorizontal();

                var propPathElements = propPath[propPath.Length-1] == '/'
                    ? propPath.Substring(0, propPath.Length-1).Split('/')
                    : propPath.Split('/');
                string propName = propPathElements[propPathElements.Length - 1];

                string favoriteButtonIcon = favoriteProps.Contains(propPath) ? "★" : "☆";
                if (GUILayout.Button(favoriteButtonIcon, GUILayout.ExpandWidth(false)))
                {
                    if (favoriteProps.Contains(propPath))
                    {
                        favoriteProps.Remove(propPath);
                    }
                    else
                    {
                        favoriteProps.Add(propPath);
                    }

                    string[] favoritePropsArray = favoriteProps.ToArray<string>();
                    PlayerPrefs.SetString(favoritePropsPlayerPrefKey, string.Join(separatorCharacter + "", favoritePropsArray));
                }

                if (GUILayout.Button(propName))
                {
                    menu._dpp.SetCurrentObject(propPath);
                }

                GUILayout.EndHorizontal();
            }
            GUILayout.EndScrollView();

            GUILayout.Space(5);
        }
    }
}