using GameFramework.Resource;
using GeometryTD.CustomUtility;
using GeometryTD.DataTable;
using GeometryTD.Definition;
using GeometryTD.Entity;
using GeometryTD.Entity.EntityData;
using GeometryTD.UI;
using UnityEngine;
using UnityGameFramework.Runtime;

namespace GeometryTD.CustomComponent
{
    internal sealed class CombatLoadSession
    {
        internal enum EventHandleStatus : byte
        {
            Ignored = 0,
            Succeeded = 1,
            Failed = 2
        }

        private EntityComponent _entity;
        private CombatInfoFormUseCase _combatInfoFormUseCase;
        private int _loadingMapEntityId;
        private int _loadedMapEntityId;
        private int? _loadingCombatInfoFormSerialId;
        private bool _isCombatInfoFormReady;
        private MapEntity _currentMap;

        public MapEntity CurrentMap => _currentMap;
        public bool IsReady => _currentMap != null && _isCombatInfoFormReady;

        public void OnInit(EntityComponent entityComponent)
        {
            _entity = entityComponent;
            Reset();
        }

        public void Reset()
        {
            _loadingMapEntityId = 0;
            _loadedMapEntityId = 0;
            _loadingCombatInfoFormSerialId = null;
            _isCombatInfoFormReady = false;
            _currentMap = null;
        }

        public bool StartLoading(DRLevel level, MapEntityLoadContext mapLoadContext, ICombatSchedulerHost schedulerHost, out string errorMessage)
        {
            errorMessage = null;
            if (_entity == null)
            {
                errorMessage = "CombatLoadSession start failed. Entity component is null.";
                return false;
            }

            if (!TryShowMap(level, mapLoadContext, out errorMessage))
            {
                return false;
            }

            if (!TryOpenCombatInfoForm(schedulerHost, out errorMessage))
            {
                return false;
            }
            
            return true;
        }

        public void RefreshCombatInfoForm(DRLevel currentLevel)
        {
            if (currentLevel == null)
            {
                return;
            }

            GameEntry.UIRouter.OpenUI(UIFormType.CombatInfoForm);
        }

        public void Cleanup()
        {
            if (_entity == null)
            {
                return;
            }

            if (_loadingMapEntityId != 0 && _entity.IsLoadingEntity(_loadingMapEntityId))
            {
                _entity.HideEntity(_loadingMapEntityId);
            }

            if (_currentMap != null)
            {
                _entity.HideEntity(_currentMap);
            }
            else if (_loadedMapEntityId != 0)
            {
                UnityGameFramework.Runtime.Entity loadedMapEntity = _entity.GetEntity(_loadedMapEntityId);
                if (loadedMapEntity != null)
                {
                    _entity.HideEntity(loadedMapEntity);
                }
            }

            CloseCombatInfoForm();
        }

        public EventHandleStatus HandleShowEntitySuccess(ShowEntitySuccessEventArgs args, out string errorMessage)
        {
            errorMessage = null;
            if (args == null)
            {
                return EventHandleStatus.Ignored;
            }

            if (args.EntityLogicType != typeof(MapEntity) || args.Entity == null ||
                args.Entity.Id != _loadingMapEntityId)
            {
                return EventHandleStatus.Ignored;
            }

            _loadedMapEntityId = _loadingMapEntityId;
            _loadingMapEntityId = 0;
            _currentMap = args.Entity.Logic as MapEntity;
            if (_currentMap == null)
            {
                errorMessage = $"Loaded map entity logic is invalid. EntityId={args.Entity.Id}.";
                return EventHandleStatus.Failed;
            }

            return EventHandleStatus.Succeeded;
        }

        public EventHandleStatus HandleShowEntityFailure(ShowEntityFailureEventArgs args, out string errorMessage)
        {
            errorMessage = null;
            if (args == null)
            {
                return EventHandleStatus.Ignored;
            }

            if (args.EntityLogicType != typeof(MapEntity) || args.EntityId != _loadingMapEntityId)
            {
                return EventHandleStatus.Ignored;
            }

            _loadingMapEntityId = 0;
            _currentMap = null;
            errorMessage = $"Map load failed. Asset='{args.EntityAssetName}', Error='{args.ErrorMessage}'.";
            return EventHandleStatus.Failed;
        }

        public void HandleHideEntityComplete(HideEntityCompleteEventArgs args)
        {
            if (args == null)
            {
                return;
            }

            if (args.EntityId == _loadedMapEntityId)
            {
                _loadedMapEntityId = 0;
                _currentMap = null;
            }

            if (args.EntityId == _loadingMapEntityId)
            {
                _loadingMapEntityId = 0;
            }
        }

        public EventHandleStatus HandleOpenUIFormSuccess(OpenUIFormSuccessEventArgs args, out string errorMessage)
        {
            errorMessage = null;
            if (args == null || !_loadingCombatInfoFormSerialId.HasValue || args.UIForm == null)
            {
                return EventHandleStatus.Ignored;
            }

            if (args.UIForm.SerialId != _loadingCombatInfoFormSerialId.Value)
            {
                return EventHandleStatus.Ignored;
            }

            _isCombatInfoFormReady = args.UIForm.Logic is CombatInfoForm;
            if (!_isCombatInfoFormReady)
            {
                errorMessage = "CombatInfoForm open success but form logic type is invalid.";
                return EventHandleStatus.Failed;
            }

            return EventHandleStatus.Succeeded;
        }

        public EventHandleStatus HandleOpenUIFormFailure(OpenUIFormFailureEventArgs args, out string errorMessage)
        {
            errorMessage = null;
            if (args == null || !_loadingCombatInfoFormSerialId.HasValue)
            {
                return EventHandleStatus.Ignored;
            }

            if (args.SerialId != _loadingCombatInfoFormSerialId.Value)
            {
                return EventHandleStatus.Ignored;
            }

            _isCombatInfoFormReady = false;
            errorMessage = $"CombatInfoForm load failed. Asset='{args.UIFormAssetName}', Error='{args.ErrorMessage}'.";
            return EventHandleStatus.Failed;
        }

        public void HandleCloseUIFormComplete(CloseUIFormCompleteEventArgs args)
        {
            if (args == null || !_loadingCombatInfoFormSerialId.HasValue)
            {
                return;
            }

            if (args.SerialId == _loadingCombatInfoFormSerialId.Value)
            {
                _loadingCombatInfoFormSerialId = null;
                _isCombatInfoFormReady = false;
            }
        }

        private bool TryShowMap(DRLevel level, MapEntityLoadContext mapLoadContext, out string errorMessage)
        {
            errorMessage = null;
            if (level == null)
            {
                errorMessage = "CombatLoadSession map load failed. Level is null.";
                return false;
            }

            string mapAssetName = level.Id.ToString();
            string mapAssetPath = AssetUtility.GetLevelMapAsset(mapAssetName);
            if (GameEntry.Resource.HasAsset(mapAssetPath) == HasAssetResult.NotExist)
            {
                errorMessage = $"CombatLoadSession map asset not found. Level='{level.Id}', Asset='{mapAssetPath}'.";
                return false;
            }

            _loadingMapEntityId = _entity.GenerateSerialId();
            MapData resolvedMapData = mapLoadContext?.InitialMapData != null
                ? mapLoadContext.InitialMapData.CloneForEntity(_loadingMapEntityId, Vector3.zero)
                : new MapData(_loadingMapEntityId, level.Id, Vector3.zero);
            MapEntityLoadContext resolvedLoadContext = new MapEntityLoadContext(
                resolvedMapData,
                mapLoadContext?.TryConsumeCoin,
                mapLoadContext?.AddCoin);
            _entity.ShowMap(resolvedLoadContext, mapAssetName);
            return true;
        }

        private bool TryOpenCombatInfoForm(ICombatSchedulerHost schedulerHost, out string errorMessage)
        {
            errorMessage = null;
            if (_combatInfoFormUseCase == null)
            {
                _combatInfoFormUseCase = new CombatInfoFormUseCase();
                GameEntry.UIRouter.BindUIUseCase(UIFormType.CombatInfoForm, _combatInfoFormUseCase);
            }

            _combatInfoFormUseCase.Configure(
                () => BuildCombatInfoFormRawData(schedulerHost),
                () => schedulerHost != null && schedulerHost.CanEndCombat && schedulerHost.TryEndCombatByPlayer(),
                () => schedulerHost != null && schedulerHost.TryDebugFail("Manual debug fail from CombatInfoForm."));

            int? serialId = GameEntry.UIRouter.OpenUI(UIFormType.CombatInfoForm);
            if (!serialId.HasValue)
            {
                errorMessage = "CombatLoadSession failed to open CombatInfoForm.";
                return false;
            }

            _loadingCombatInfoFormSerialId = serialId.Value;
            _isCombatInfoFormReady = GameEntry.UI.HasUIForm(serialId.Value);
            return true;
        }

        private static CombatInfoFormRawData BuildCombatInfoFormRawData(ICombatSchedulerHost schedulerHost)
        {
            if (schedulerHost == null)
            {
                return null;
            }

            DRLevel level = schedulerHost.CurrentLevel;
            LevelThemeType themeType = level != null ? level.LevelThemeType : LevelThemeType.None;
            int levelId = level != null ? level.Id : 0;
            int baseHpMax = level != null ? Mathf.Max(0, level.BaseHp) : 0;
            return CombatInfoFormUseCase.BuildRawData(
                themeType,
                levelId,
                schedulerHost.DisplayPhaseIndex,
                schedulerHost.PhaseCount,
                schedulerHost.CurrentCoin,
                schedulerHost.CurrentBaseHp,
                baseHpMax,
                schedulerHost.CanEndCombat);
        }

        private void CloseCombatInfoForm()
        {
            GameEntry.UIRouter.CloseUI(UIFormType.CombatInfoForm);
            _loadingCombatInfoFormSerialId = null;
            _isCombatInfoFormReady = false;
        }
    }
}