using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using BepInEx.Configuration;
using UnityEngine;
using Object = UnityEngine.Object;

namespace MeidoPhotoStudio.Plugin
{
    using static ModelUtility;

    public class PropManager : IManager
    {
        public const string header = "PROP";
        private static readonly ConfigEntry<bool> modItemsOnly;
        private static bool cubeActive = true;
        private static Dictionary<string, string> modFileToFullPath;

        private static Dictionary<string, string> ModFileToFullPath
        {
            get
            {
                if (modFileToFullPath != null) return modFileToFullPath;

                string[] modFiles = Menu.GetModFiles();
                modFileToFullPath = new Dictionary<string, string>(modFiles.Length, StringComparer.OrdinalIgnoreCase);

                foreach (var mod in modFiles)
                {
                    var key = Path.GetFileName(mod);
                    if (!modFileToFullPath.ContainsKey(key)) modFileToFullPath[key] = mod;
                }

                return modFileToFullPath;
            }
        }

        public static bool CubeActive
        {
            get => cubeActive;
            set
            {
                if (value != cubeActive)
                {
                    cubeActive = value;
                    CubeActiveChange?.Invoke(null, EventArgs.Empty);
                }
            }
        }

        private static bool cubeSmall;

        public static bool CubeSmall
        {
            get => cubeSmall;
            set
            {
                if (value != cubeSmall)
                {
                    cubeSmall = value;
                    CubeSmallChange?.Invoke(null, EventArgs.Empty);
                }
            }
        }

        private static event EventHandler CubeActiveChange;
        private static event EventHandler CubeSmallChange;
        public static bool ModItemsOnly => modItemsOnly.Value;
        private readonly List<DragPointProp> propList = new List<DragPointProp>();

        public string[] PropNameList => propList.Count == 0
            ? new[] { Translation.Get("systemMessage", "noProps") }
            : propList.Select(prop => prop.Name).ToArray();

        public int PropCount => propList.Count;
        private int currentPropIndex;
        private MeidoManager meidoManager;

        public int CurrentPropIndex
        {
            get => currentPropIndex;
            set
            {
                if (PropCount == 0)
                {
                    currentPropIndex = 0;
                    return;
                }

                if ((uint) value >= (uint) PropCount) throw new ArgumentOutOfRangeException(nameof(value));

                if (currentPropIndex == value) return;

                currentPropIndex = value;
                PropSelectionChange?.Invoke(this, EventArgs.Empty);
            }
        }

        public DragPointProp CurrentProp => PropCount == 0 ? null : propList[CurrentPropIndex];
        public event EventHandler PropSelectionChange;
        public event EventHandler FromPropSelect;
        public event EventHandler PropListChange;

        static PropManager() => modItemsOnly = Configuration.Config.Bind(
            "Prop", "ModItemsOnly",
            false,
            "Disable waiting for and loading base game clothing"
        );

        public PropManager(MeidoManager meidoManager)
        {
            this.meidoManager = meidoManager;
            meidoManager.BeginCallMeidos += OnBeginCallMeidos;
            meidoManager.EndCallMeidos += OnEndCallMeidos;
            Activate();
        }

        public bool AddFromPropInfo(PropInfo propInfo)
        {
            switch (propInfo.Type)
            {
                case PropInfo.PropType.Mod:
                    ModItem modItem;
                    if (!string.IsNullOrEmpty(propInfo.SubFilename))
                    {
                        modItem = ModItem.OfficialMod(ModFileToFullPath[propInfo.Filename]);
                        modItem.BaseMenuFile = propInfo.SubFilename;
                    }
                    else modItem = ModItem.Mod(propInfo.Filename);

                    return AddModProp(modItem);
                case PropInfo.PropType.MyRoom:
                    return AddMyRoomProp(new MyRoomItem { ID = propInfo.MyRoomID, PrefabName = propInfo.Filename });
                case PropInfo.PropType.Bg:
                    return AddBgProp(propInfo.Filename);
                case PropInfo.PropType.Odogu:
                    return AddGameProp(propInfo.Filename);
                default: throw new ArgumentOutOfRangeException();
            }
        }

        public bool AddModProp(ModItem modItem)
        {
            var model = LoadMenuModel(modItem);
            if (!model) return false;

            var name = modItem.MenuFile;
            if (modItem.IsOfficialMod) name = Path.GetFileName(name) + ".menu"; // add '.menu' for partsedit support
            model.name = name;

            var dragPoint = AttachDragPoint(model);
            dragPoint.Info = PropInfo.FromModItem(modItem);

            AddProp(dragPoint);

            return true;
        }

        public bool AddMyRoomProp(MyRoomItem myRoomItem)
        {
            var model = LoadMyRoomModel(myRoomItem);
            if (!model) return false;

            model.name = Translation.Get("myRoomPropNames", myRoomItem.PrefabName);

            var dragPoint = AttachDragPoint(model);
            dragPoint.Info = PropInfo.FromMyRoom(myRoomItem);

            AddProp(dragPoint);

            return true;
        }

        public bool AddBgProp(string assetName)
        {
            var model = LoadBgModel(assetName);
            if (!model) return false;

            model.name = Translation.Get("bgNames", assetName);

            var dragPoint = AttachDragPoint(model);
            dragPoint.Info = PropInfo.FromBg(assetName);

            AddProp(dragPoint);

            return true;
        }

        public bool AddGameProp(string assetName)
        {
            var isMenu = assetName.EndsWith(".menu");
            var model = isMenu ? LoadMenuModel(assetName) : LoadGameModel(assetName);
            if (!model) return false;

            model.name = Translation.Get("propNames", isMenu ? Utility.HandItemToOdogu(assetName) : assetName, !isMenu);

            var dragPoint = AttachDragPoint(model);
            dragPoint.Info = PropInfo.FromGameProp(assetName);

            AddProp(dragPoint);

            return true;
        }

        public void CopyProp(int propIndex)
        {
            if ((uint) propIndex >= (uint) PropCount) throw new ArgumentOutOfRangeException(nameof(propIndex));

            AddFromPropInfo(propList[propIndex].Info);
        }

        public void DeleteAllProps()
        {
            foreach (var prop in propList) DestroyProp(prop);
            propList.Clear();
            CurrentPropIndex = 0;
            EmitPropListChange();
        }

        public void RemoveProp(int index)
        {
            if ((uint) index >= (uint) PropCount) throw new ArgumentOutOfRangeException(nameof(index));

            DestroyProp(propList[index]);
            propList.RemoveAt(index);
            CurrentPropIndex = Utility.Bound(CurrentPropIndex, 0, PropCount - 1);
            EmitPropListChange();
        }

        public void AttachProp(DragPointProp prop, AttachPoint point, int index)
        {
            if ((uint) index >= (uint) meidoManager.ActiveMeidoList.Count) return;

            var meido = meidoManager.ActiveMeidoList[index];

            prop.AttachTo(meido, point);
        }

        private DragPointProp AttachDragPoint(GameObject model)
        {
            var dragPoint = DragPoint.Make<DragPointProp>(PrimitiveType.Cube, Vector3.one * 0.12f);
            dragPoint.Initialize(() => model.transform.position, () => Vector3.zero);
            dragPoint.Set(model.transform);
            dragPoint.AddGizmo(0.45f, CustomGizmo.GizmoMode.World);
            dragPoint.ConstantScale = true;
            dragPoint.DragPointScale = CubeSmall ? DragPointGeneral.smallCube : 1f;
            dragPoint.Delete += OnDeleteProp;
            dragPoint.Select += OnSelectProp;
            return dragPoint;
        }

        private void AddProp(DragPointProp dragPoint)
        {
            propList.Add(dragPoint);
            EmitPropListChange();
        }

        private void DestroyProp(DragPointProp prop)
        {
            if (!prop) return;

            prop.Delete -= OnDeleteProp;
            prop.Select -= OnSelectProp;
            Object.Destroy(prop.gameObject);
        }

        private void EmitPropListChange() => PropListChange?.Invoke(this, EventArgs.Empty);

        private void OnBeginCallMeidos(object sender, EventArgs args)
        {
            foreach (var prop in propList.Where(p => p.AttachPointInfo.AttachPoint != AttachPoint.None))
                prop.DetachTemporary();
        }

        private void OnEndCallMeidos(object sender, EventArgs args)
        {
            foreach (var prop in propList.Where(p => p.AttachPointInfo.AttachPoint != AttachPoint.None))
            {
                var info = prop.AttachPointInfo;
                var meido = meidoManager.GetMeido(info.MaidGuid);
                prop.AttachTo(meido, info.AttachPoint, meido == null);
            }
        }

        private void OnDeleteProp(object sender, EventArgs args)
            => RemoveProp(propList.IndexOf((DragPointProp) sender));

        private void OnSelectProp(object sender, EventArgs args)
        {
            CurrentPropIndex = propList.IndexOf((DragPointProp) sender);
            FromPropSelect?.Invoke(this, EventArgs.Empty);
        }

        private void OnCubeSmall(object sender, EventArgs args)
        {
            foreach (var dragPoint in propList) dragPoint.DragPointScale = CubeSmall ? DragPointGeneral.smallCube : 1f;
        }

        private void OnCubeActive(object sender, EventArgs args)
        {
            foreach (var dragPoint in propList) dragPoint.gameObject.SetActive(CubeActive);
        }

        public void Update() { }

        public void Activate()
        {
            CubeSmallChange += OnCubeSmall;
            CubeActiveChange += OnCubeActive;
        }

        public void Deactivate()
        {
            DeleteAllProps();
            CubeSmallChange -= OnCubeSmall;
            CubeActiveChange -= OnCubeActive;
        }
    }
}