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

namespace GeometryTD.UI
{
    public class CombatFinishFormController : UIFormControllerCommonBase<CombatFinishFormContext, CombatFinishForm>
    {
        private CombatFinishFormUseCase _useCase;
        private readonly Dictionary<long, ItemDescSeed> _itemDescSeedMap = new Dictionary<long, ItemDescSeed>();

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

        protected override UIFormType UIFormTypeId => UIFormType.CombatFinishForm;

        protected override void RefreshUI(CombatFinishForm form, CombatFinishFormContext context)
        {
            form.RefreshUI(context);
        }

        protected override void SubscribeCustomEvents()
        {
            GameEntry.Event.Subscribe(CombatFinishReturnEventArgs.EventId, OnCombatFinishReturnButtonClicked);
            GameEntry.Event.Subscribe(RepoItemDetailRequestedEventArgs.EventId, OnRepoItemDetailRequested);
        }

        protected override void UnsubscribeCustomEvents()
        {
            GameEntry.Event.Unsubscribe(CombatFinishReturnEventArgs.EventId, OnCombatFinishReturnButtonClicked);
            GameEntry.Event.Unsubscribe(RepoItemDetailRequestedEventArgs.EventId, OnRepoItemDetailRequested);
        }

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

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

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

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

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

        public int? OpenUI(CombatFinishFormRawData rawData)
        {
            CombatFinishFormContext context = BuildContext(rawData);
            return OpenUIInternal(context);
        }

        public override void BindUseCase(IUIUseCase useCase)
        {
            if (!(useCase is CombatFinishFormUseCase combatFinishFormUseCase))
            {
                Log.Error("CombatFinishFormController.BindUseCase() useCase is invalid.");
                return;
            }

            _useCase = combatFinishFormUseCase;
        }

        private CombatFinishFormContext BuildContext(CombatFinishFormRawData rawData)
        {
            _itemDescSeedMap.Clear();
            if (rawData == null)
            {
                return null;
            }

            return new CombatFinishFormContext
            {
                EnemyKilledText = rawData.DefeatedEnemyCount.ToString(),
                GoldGainedText = rawData.GainedGold.ToString(),
                RewardItems = BuildRewardItems(rawData.RewardInventory),
                CanReturn = rawData.CanReturn
            };
        }

        private RepoItemContext[] BuildRewardItems(BackpackInventoryData inventory)
        {
            if (inventory == null)
            {
                return System.Array.Empty<RepoItemContext>();
            }

            List<RepoItemContext> itemContexts = new List<RepoItemContext>();

            if (inventory.Towers != null)
            {
                for (int i = 0; i < inventory.Towers.Count; i++)
                {
                    var tower = inventory.Towers[i];
                    if (tower == null)
                    {
                        continue;
                    }

                    itemContexts.Add(new RepoItemContext
                    {
                        InstanceId = tower.InstanceId,
                        CanDrag = false,
                        ComponentSlotType = TowerCompSlotType.None,
                        IconAreaContext = BuildIconAreaContext(tower)
                    });

                    AddItemDescSeed(tower.InstanceId, tower.Name, "Tower",
                        tower.Stats != null ? tower.Stats.Tags : null);
                }
            }

            if (inventory.MuzzleComponents != null)
            {
                for (int i = 0; i < inventory.MuzzleComponents.Count; i++)
                {
                    var item = inventory.MuzzleComponents[i];
                    if (item == null)
                    {
                        continue;
                    }

                    itemContexts.Add(new RepoItemContext
                    {
                        InstanceId = item.InstanceId,
                        CanDrag = false,
                        ComponentSlotType = TowerCompSlotType.Muzzle,
                        IconAreaContext = BuildIconAreaContext(item)
                    });

                    AddItemDescSeed(item.InstanceId, item.Name, BuildComponentTypeText(item.SlotType), item.Tags);
                }
            }

            if (inventory.BearingComponents != null)
            {
                foreach (var item in inventory.BearingComponents)
                {
                    if (item == null)
                    {
                        continue;
                    }

                    itemContexts.Add(new RepoItemContext
                    {
                        InstanceId = item.InstanceId,
                        CanDrag = false,
                        ComponentSlotType = TowerCompSlotType.Bearing,
                        IconAreaContext = BuildIconAreaContext(item)
                    });

                    AddItemDescSeed(item.InstanceId, item.Name, BuildComponentTypeText(item.SlotType), item.Tags);
                }
            }

            if (inventory.BaseComponents != null)
            {
                for (int i = 0; i < inventory.BaseComponents.Count; i++)
                {
                    var item = inventory.BaseComponents[i];
                    if (item == null)
                    {
                        continue;
                    }

                    itemContexts.Add(new RepoItemContext
                    {
                        InstanceId = item.InstanceId,
                        CanDrag = false,
                        ComponentSlotType = TowerCompSlotType.Base,
                        IconAreaContext = BuildIconAreaContext(item)
                    });

                    AddItemDescSeed(item.InstanceId, item.Name, BuildComponentTypeText(item.SlotType), item.Tags);
                }
            }

            return itemContexts.ToArray();
        }

        private void AddItemDescSeed(long itemId, string title, string typeText, TagType[] tags)
        {
            if (itemId <= 0)
            {
                return;
            }

            _itemDescSeedMap[itemId] = new ItemDescSeed
            {
                Title = string.IsNullOrWhiteSpace(title) ? $"Item {itemId}" : title,
                TypeText = typeText ?? string.Empty,
                Tags = CloneTags(tags)
            };
        }

        private static TagType[] CloneTags(TagType[] tags)
        {
            return tags != null ? (TagType[])tags.Clone() : System.Array.Empty<TagType>();
        }

        private static string BuildComponentTypeText(TowerCompSlotType slotType)
        {
            return slotType switch
            {
                TowerCompSlotType.Muzzle => "Muzzle Component",
                TowerCompSlotType.Bearing => "Bearing Component",
                TowerCompSlotType.Base => "Base Component",
                TowerCompSlotType.Accessory => "Accessory",
                _ => "Component"
            };
        }

        private static IconAreaContext BuildIconAreaContext(DefenseTowerItemData tower)
        {
            if (tower == null)
            {
                return new IconAreaContext
                {
                    ComponentSlotType = TowerCompSlotType.None,
                    Rarity = RarityType.None,
                    Color = Color.white,
                    Icon = null
                };
            }

            return new IconAreaContext
            {
                ComponentSlotType = TowerCompSlotType.None,
                Rarity = tower.Rarity,
                Color = IconColorGenerator.GenerateForTower(tower),
                Icon = null
            };
        }

        private static IconAreaContext BuildIconAreaContext(TowerCompItemData item)
        {
            if (item == null)
            {
                return new IconAreaContext
                {
                    ComponentSlotType =  TowerCompSlotType.None,
                    Rarity = RarityType.None,
                    Color = Color.white,
                    Icon = null
                };
            }

            return new IconAreaContext
            {
                ComponentSlotType = item.SlotType,
                Rarity = item.Rarity,
                Color = IconColorGenerator.GenerateForComponent(item),
                Icon = null
            };
        }

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

            _useCase?.TryReturnToMenu();
        }

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

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

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

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

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

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

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

            return false;
        }
    }
}