using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using Dalamud.Game.Text.SeStringHandling;
using Dalamud.Plugin.Services;
using FFXIVClientStructs.FFXIV.Client.Game;
using LLib;
using Lumina.Excel.Sheets;
using Microsoft.Extensions.Logging;
using Questionable.Functions;
using Questionable.Model;
using Questionable.Model.Questing;

namespace Questionable.Controller.Steps.Interactions;

internal static class EquipItem
{
	internal sealed class Factory : SimpleTaskFactory
	{
		public override ITask? CreateTask(Questionable.Model.Quest quest, QuestSequence sequence, QuestStep step)
		{
			if (step.InteractionType != EInteractionType.EquipItem)
			{
				return null;
			}
			ArgumentNullException.ThrowIfNull(step.ItemId, "step.ItemId");
			return new Task(step.ItemId.Value);
		}
	}

	internal sealed record Task(uint ItemId) : ITask
	{
		public override string ToString()
		{
			return $"Equip({ItemId})";
		}
	}

	internal sealed class DoEquip(IDataManager dataManager, ILogger<DoEquip> logger) : TaskExecutor<Task>(), IToastAware, ITaskExecutor
	{
		private const int MaxAttempts = 3;

		private static readonly IReadOnlyList<InventoryType> SourceInventoryTypes = new global::_003C_003Ez__ReadOnlyArray<InventoryType>(new InventoryType[16]
		{
			InventoryType.ArmoryMainHand,
			InventoryType.ArmoryOffHand,
			InventoryType.ArmoryHead,
			InventoryType.ArmoryBody,
			InventoryType.ArmoryHands,
			InventoryType.ArmoryLegs,
			InventoryType.ArmoryFeets,
			InventoryType.ArmoryEar,
			InventoryType.ArmoryNeck,
			InventoryType.ArmoryWrist,
			InventoryType.ArmoryRings,
			InventoryType.ArmorySoulCrystal,
			InventoryType.Inventory1,
			InventoryType.Inventory2,
			InventoryType.Inventory3,
			InventoryType.Inventory4
		});

		private int _attempts;

		private Item? _item;

		private List<ushort> _targetSlots;

		private DateTime _continueAt = DateTime.MaxValue;

		protected override bool Start()
		{
			_item = dataManager.GetExcelSheet<Item>().GetRowOrDefault(base.Task.ItemId) ?? throw new ArgumentOutOfRangeException("ItemId");
			_targetSlots = GetEquipSlot(_item) ?? throw new InvalidOperationException("Not a piece of equipment");
			Equip();
			_continueAt = DateTime.Now.AddSeconds(1.0);
			return true;
		}

		public unsafe override ETaskResult Update()
		{
			if (DateTime.Now < _continueAt)
			{
				return ETaskResult.StillRunning;
			}
			InventoryManager* ptr = InventoryManager.Instance();
			if (ptr == null)
			{
				return ETaskResult.StillRunning;
			}
			foreach (ushort targetSlot in _targetSlots)
			{
				InventoryItem* inventorySlot = ptr->GetInventorySlot(InventoryType.EquippedItems, targetSlot);
				if (inventorySlot != null && inventorySlot->ItemId == base.Task.ItemId)
				{
					return ETaskResult.TaskComplete;
				}
			}
			Equip();
			_continueAt = DateTime.Now.AddSeconds(1.0);
			return ETaskResult.StillRunning;
		}

		private unsafe void Equip()
		{
			_attempts++;
			if (_attempts > 3)
			{
				throw new TaskException("Unable to equip gear.");
			}
			InventoryManager* inventoryManager = InventoryManager.Instance();
			if (inventoryManager == null)
			{
				return;
			}
			InventoryContainer* inventoryContainer = inventoryManager->GetInventoryContainer(InventoryType.EquippedItems);
			if (inventoryContainer == null)
			{
				return;
			}
			foreach (ushort targetSlot in _targetSlots)
			{
				InventoryItem* inventorySlot = inventoryContainer->GetInventorySlot(targetSlot);
				if (inventorySlot != null && inventorySlot->ItemId == base.Task.ItemId)
				{
					logger.LogInformation("Already equipped {Item}, skipping step", _item?.Name.ToString());
					return;
				}
			}
			foreach (InventoryType sourceInventoryType in SourceInventoryTypes)
			{
				InventoryContainer* inventoryContainer2 = inventoryManager->GetInventoryContainer(sourceInventoryType);
				if (inventoryContainer2 == null || (inventoryManager->GetItemCountInContainer(base.Task.ItemId, sourceInventoryType, isHq: true, 0) == 0 && inventoryManager->GetItemCountInContainer(base.Task.ItemId, sourceInventoryType, isHq: false, 0) == 0))
				{
					continue;
				}
				for (ushort num = 0; num < inventoryContainer2->Size; num++)
				{
					InventoryItem* inventorySlot2 = inventoryContainer2->GetInventorySlot(num);
					if (inventorySlot2 != null && inventorySlot2->ItemId == base.Task.ItemId)
					{
						ushort num2 = _targetSlots.Where(delegate(ushort x)
						{
							InventoryItem* inventorySlot3 = inventoryManager->GetInventorySlot(InventoryType.EquippedItems, x);
							return inventorySlot3 == null || inventorySlot3->ItemId == 0;
						}).Concat(_targetSlots).First();
						logger.LogInformation("Equipping item from {SourceInventory}, {SourceSlot} to {TargetInventory}, {TargetSlot}", sourceInventoryType, num, InventoryType.EquippedItems, num2);
						int num3 = inventoryManager->MoveItemSlot(sourceInventoryType, num, InventoryType.EquippedItems, num2, a6: true);
						logger.LogInformation("MoveItemSlot result: {Result}", num3);
						return;
					}
				}
			}
			throw new TaskException($"Could not equip item {base.Task.ItemId}.");
		}

		private static List<ushort>? GetEquipSlot(Item? item)
		{
			if (!item.HasValue)
			{
				return new List<ushort>();
			}
			Span<ushort> span;
			switch (item.Value.EquipSlotCategory.RowId)
			{
			case 1u:
			case 2u:
			case 3u:
			case 4u:
			case 5u:
			case 6u:
			case 7u:
			case 8u:
			case 9u:
			case 10u:
			case 11u:
			{
				int index = 1;
				List<ushort> list4 = new List<ushort>(index);
				CollectionsMarshal.SetCount(list4, index);
				span = CollectionsMarshal.AsSpan(list4);
				int num = 0;
				span[num] = (ushort)(item.Value.EquipSlotCategory.RowId - 1);
				return list4;
			}
			case 12u:
			{
				int num = 2;
				List<ushort> list3 = new List<ushort>(num);
				CollectionsMarshal.SetCount(list3, num);
				span = CollectionsMarshal.AsSpan(list3);
				int index = 0;
				span[index] = 11;
				index++;
				span[index] = 12;
				return list3;
			}
			case 13u:
			{
				int index = 1;
				List<ushort> list2 = new List<ushort>(index);
				CollectionsMarshal.SetCount(list2, index);
				span = CollectionsMarshal.AsSpan(list2);
				int num = 0;
				span[num] = 0;
				return list2;
			}
			case 17u:
			{
				int num = 1;
				List<ushort> list = new List<ushort>(num);
				CollectionsMarshal.SetCount(list, num);
				span = CollectionsMarshal.AsSpan(list);
				int index = 0;
				span[index] = 13;
				return list;
			}
			default:
				return null;
			}
		}

		public bool OnErrorToast(SeString message)
		{
			string b = dataManager.GetString(709u, (LogMessage x) => x.Text);
			if (GameFunctions.GameStringEquals(message.TextValue, b))
			{
				_attempts = 3;
			}
			return false;
		}

		public override bool ShouldInterruptOnDamage()
		{
			return true;
		}
	}
}