using System.Collections.Generic;
using GeometryTD.CustomEvent;
using GeometryTD.Definition;
using GameFramework.Event;
using UnityEngine;
using UnityGameFramework.Runtime;

namespace GeometryTD.UI
{
    public partial class RepoFormController : UIFormControllerCommonBase<RepoFormContext, RepoForm>
    {
        private const int MaxParticipantCount = 4;
        private RepoFormUseCase _useCase;
        private readonly Dictionary<long, RepoItemContext> _itemContextMap = new Dictionary<long, RepoItemContext>();
        private readonly Dictionary<long, ItemDescSeed> _itemDescSeedMap = new Dictionary<long, ItemDescSeed>();
        private readonly HashSet<long> _participantTowerIds = new HashSet<long>();

        private sealed class ItemDescSeed
        {
            public string Title;
            public string TypeText;
            public string Description;
            public TagType[] Tags;
        }

        protected override UIFormType UIFormTypeId => UIFormType.RepoForm;

        protected override void RefreshUI(RepoForm form, RepoFormContext context)
        {
            form.RefreshUI(context);
            ApplyParticipantSelection();
        }

        protected override void SubscribeCustomEvents()
        {
            GameEntry.Event.Subscribe(RepoItemClickedEventArgs.EventId, OnRepoItemClicked);
            GameEntry.Event.Subscribe(RepoItemDragEndedEventArgs.EventId, OnRepoItemDragEnded);
            GameEntry.Event.Subscribe(CombineSlotClickedEventArgs.EventId, OnCombineSlotClicked);
            GameEntry.Event.Subscribe(RepoCombineRequestedEventArgs.EventId, OnRepoCombineRequested);
            GameEntry.Event.Subscribe(RepoParticipantAssignRequestedEventArgs.EventId, OnRepoParticipantAssignRequested);
            GameEntry.Event.Subscribe(RepoFormReturnEventArgs.EventId, OnRepoFormReturn);
        }

        protected override void UnsubscribeCustomEvents()
        {
            GameEntry.Event.Unsubscribe(RepoItemClickedEventArgs.EventId, OnRepoItemClicked);
            GameEntry.Event.Unsubscribe(RepoItemDragEndedEventArgs.EventId, OnRepoItemDragEnded);
            GameEntry.Event.Unsubscribe(CombineSlotClickedEventArgs.EventId, OnCombineSlotClicked);
            GameEntry.Event.Unsubscribe(RepoCombineRequestedEventArgs.EventId, OnRepoCombineRequested);
            GameEntry.Event.Unsubscribe(RepoParticipantAssignRequestedEventArgs.EventId, OnRepoParticipantAssignRequested);
            GameEntry.Event.Unsubscribe(RepoFormReturnEventArgs.EventId, OnRepoFormReturn);
        }

        public override int? OpenUI(object userData = null)
        {
            if (userData is RepoFormContext repoFormContext)
            {
                return OpenUIInternal(repoFormContext);
            }

            if (userData is RepoFormRawData rawDataFromUserData)
            {
                return OpenUI(rawDataFromUserData);
            }

            if (userData != null)
            {
                Log.Warning("RepoFormController.OpenUI() userData type is invalid.");
                return null;
            }

            if (_useCase == null)
            {
                Log.Error("RepoFormController.OpenUI() useCase is null.");
                return null;
            }

            RepoFormRawData rawData = _useCase.CreateInitialModel();
            return OpenUI(rawData);
        }

        public int? OpenUI(RepoFormRawData rawData)
        {
            RepoFormContext context = BuildContext(rawData);
            return OpenUIInternal(context);
        }

        public override void BindUseCase(IUIUseCase useCase)
        {
            if (!(useCase is RepoFormUseCase repoFormUseCase))
            {
                Log.Error("RepoFormController.BindUseCase() useCase is invalid.");
                return;
            }

            _useCase = repoFormUseCase;
        }

        #region Event Handlers

        private void OnRepoItemClicked(object sender, GameEventArgs e)
        {
            if (!IsEventFromCurrentForm(sender))
            {
                return;
            }

            if (!(e is RepoItemClickedEventArgs args))
            {
                return;
            }

            RepoItemClickActionType clickActionType = RepoItemClickActionType.OpenDetail;
            if (sender is RepoItem clickedItem && clickedItem.Context != null)
            {
                clickActionType = clickedItem.Context.ClickActionType;
            }
            else if (_itemContextMap.TryGetValue(args.ItemId, out RepoItemContext itemContextFromMap) &&
                     itemContextFromMap != null)
            {
                clickActionType = itemContextFromMap.ClickActionType;
            }

            if (args.ItemId <= 0)
            {
                return;
            }

            if (clickActionType == RepoItemClickActionType.RemoveParticipant)
            {
                if (_useCase == null || Form == null)
                {
                    return;
                }

                if (!_useCase.TryRemoveParticipantTower(args.ItemId))
                {
                    return;
                }

                RefreshParticipantAreaOnly();
                return;
            }

            if (!_itemDescSeedMap.TryGetValue(args.ItemId, out ItemDescSeed seed))
            {
                return;
            }

            GameEntry.UIRouter.OpenUI(UIFormType.ItemDescForm, new ItemDescFormRawData
            {
                Title = seed.Title,
                TypeText = seed.TypeText,
                Description = seed.Description ?? string.Empty,
                Price = 0,
                TargetPos = args.TargetPos,
                Tags = CloneTags(seed.Tags)
            });
        }

        private void OnRepoItemDragEnded(object sender, GameEventArgs e)
        {
            if (!IsEventFromCurrentForm(sender))
            {
                return;
            }

            if (!(e is RepoItemDragEndedEventArgs args))
            {
                return;
            }

            if (Form == null || !_itemContextMap.ContainsKey(args.ItemId))
            {
                return;
            }

            Form.SetRepoItemSelected(args.ItemId, args.Assigned);
        }

        private void OnCombineSlotClicked(object sender, GameEventArgs e)
        {
            if (!IsEventFromCurrentForm(sender))
            {
                return;
            }

            if (!(e is CombineSlotClickedEventArgs args))
            {
                return;
            }

            if (Form == null)
            {
                return;
            }

            if (Form.TryClearCombineSlot(args.SlotIndex, out long removedItemId) && removedItemId > 0)
            {
                Form.SetRepoItemSelected(removedItemId, false);
            }
        }

        private void OnRepoFormReturn(object sender, GameEventArgs e)
        {
            if (!IsEventFromCurrentForm(sender) || !(e is RepoFormReturnEventArgs))
            {
                return;
            }

            if (Form == null)
            {
                return;
            }
            
            this.CloseUI();
        }

        private void OnRepoCombineRequested(object sender, GameEventArgs e)
        {
            if (!IsEventFromCurrentForm(sender))
            {
                return;
            }

            if (!(e is RepoCombineRequestedEventArgs args))
            {
                return;
            }

            if (_useCase == null || Form == null)
            {
                return;
            }

            if (!_useCase.TryAssembleTower(args.MuzzleItemId, args.BearingItemId, args.BaseItemId))
            {
                return;
            }

            RepoFormRawData latestRawData = _useCase.CreateInitialModel();
            RepoFormContext latestContext = BuildContext(latestRawData);
            if (latestContext != null)
            {
                Form.RefreshUI(latestContext);
                ApplyParticipantSelection();
            }
        }

        private void OnRepoParticipantAssignRequested(object sender, GameEventArgs e)
        {
            if (!IsEventFromCurrentForm(sender))
            {
                return;
            }

            if (!(e is RepoParticipantAssignRequestedEventArgs args))
            {
                return;
            }
            
            if (_useCase == null || Form == null || args.TowerItemId <= 0)
            {
                return;
            }
            
            if (!_useCase.TryAddParticipantTower(args.TowerItemId))
            {
                return;
            }

            RefreshParticipantAreaOnly();
        }

        private bool IsEventFromCurrentForm(object sender)
        {
            if (Form == null)
            {
                return false;
            }

            if (ReferenceEquals(sender, Form))
            {
                return true;
            }

            if (sender is Component component)
            {
                RepoForm ownerForm = component.GetComponentInParent<RepoForm>();
                return ownerForm == Form;
            }

            return false;
        }

        #endregion
    }
}