using System;
using System.Linq;
using System.Numerics;
using Dalamud.Plugin.Services;
using FFXIVClientStructs.FFXIV.Component.GUI;
using LLib.GameUI;
using LLib.Shop;
using LLib.Shop.Model;
using Microsoft.Extensions.Logging;
using Questionable.Model.Questing;

namespace Questionable.Controller.GameUi;

internal sealed class ShopController : IDisposable, IShopWindow
{
	private readonly QuestController _questController;

	private readonly IGameGui _gameGui;

	private readonly IFramework _framework;

	private readonly RegularShopBase _shop;

	private readonly ILogger<ShopController> _logger;

	private long _lastCurrentStockSwitchMs;

	private int _currentStockSwitchAttempts;

	private uint? _lastPurchaseItemId;

	private const int MaxCurrentStockSwitchAttempts = 3;

	public bool IsEnabled => _questController.IsRunning;

	public bool IsOpen { get; set; }

	public bool IsAutoBuyEnabled => _shop.AutoBuyEnabled;

	public bool IsAwaitingYesNo
	{
		get
		{
			return _shop.IsAwaitingYesNo;
		}
		set
		{
			_shop.IsAwaitingYesNo = value;
		}
	}

	public Vector2? Position { get; set; }

	public ShopController(QuestController questController, IGameGui gameGui, IAddonLifecycle addonLifecycle, IFramework framework, ILogger<ShopController> logger, IPluginLog pluginLog, IDataManager dataManager)
	{
		_questController = questController;
		_gameGui = gameGui;
		_framework = framework;
		_shop = new RegularShopBase(this, "Shop", pluginLog, gameGui, addonLifecycle, dataManager);
		_logger = logger;
		_framework.Update += FrameworkUpdate;
	}

	public void Dispose()
	{
		_framework.Update -= FrameworkUpdate;
		_shop.Dispose();
	}

	private void FrameworkUpdate(IFramework framework)
	{
		if (!IsOpen || _shop.ItemForSale == null)
		{
			return;
		}
		if (_shop.PurchaseState != null)
		{
			_shop.HandleNextPurchaseStep();
			return;
		}
		QuestStep questStep = FindCurrentStep();
		if (questStep == null || questStep.InteractionType != EInteractionType.PurchaseItem)
		{
			_shop.ItemForSale = null;
			RestoreExternalPluginState();
			return;
		}
		int val = Math.Max(0, questStep.ItemCount.GetValueOrDefault() - (int)_shop.ItemForSale.OwnedItems);
		int num = Math.Min(_shop.GetMaxItemsToPurchase(), val);
		if (num > 0)
		{
			_logger.LogDebug("Auto-buying {ToPurchase} {ItemName}", num, _shop.ItemForSale.ItemName);
			_shop.StartAutoPurchase(num);
			_shop.HandleNextPurchaseStep();
		}
		else
		{
			_shop.ItemForSale = null;
			RestoreExternalPluginState();
		}
	}

	private QuestStep? FindCurrentStep()
	{
		QuestController.QuestProgress currentQuest = _questController.CurrentQuest;
		return (currentQuest?.Quest.FindSequence(currentQuest.Sequence))?.FindStep(currentQuest?.Step ?? 0);
	}

	public unsafe void UpdateShopStock(AtkUnitBase* addon)
	{
		QuestStep currentStep = FindCurrentStep();
		if (currentStep == null || currentStep.InteractionType != EInteractionType.PurchaseItem)
		{
			_shop.ItemForSale = null;
			return;
		}
		if (addon->AtkValuesCount != 625)
		{
			_logger.LogError("Unexpected amount of atkvalues for Shop addon ({AtkValueCount})", addon->AtkValuesCount);
			_shop.ItemForSale = null;
			return;
		}
		AtkValue* atkValues = addon->AtkValues;
		if (currentStep.ItemId != _lastPurchaseItemId)
		{
			_lastPurchaseItemId = currentStep.ItemId;
			_currentStockSwitchAttempts = 0;
		}
		uint uInt = atkValues[2].UInt;
		if (uInt == 0)
		{
			_shop.ItemForSale = null;
			return;
		}
		_shop.ItemForSale = (from i in Enumerable.Range(0, (int)uInt)
			select new ItemForSale
			{
				Position = i,
				ItemName = atkValues[14 + i].ReadAtkString(),
				Price = atkValues[75 + i].UInt,
				CurrencyItemId = 1u,
				OwnedItems = atkValues[136 + i].UInt,
				ItemId = atkValues[441 + i].UInt
			}).FirstOrDefault((ItemForSale x) => x.ItemId == currentStep.ItemId);
		if (_shop.ItemForSale != null)
		{
			_currentStockSwitchAttempts = 0;
		}
		else if (_currentStockSwitchAttempts < 3 && Environment.TickCount64 - _lastCurrentStockSwitchMs > 2000)
		{
			_currentStockSwitchAttempts++;
			_lastCurrentStockSwitchMs = Environment.TickCount64;
			_logger.LogWarning("Shop list has {ItemCount} item(s) but not {ItemId}; switching to Current Stock tab ({Attempt}/{Max})", uInt, currentStep.ItemId, _currentStockSwitchAttempts, 3);
			SwitchToCurrentStockTab(addon);
		}
	}

	public unsafe void TriggerPurchase(AtkUnitBase* addonShop, int buyNow)
	{
		AtkValue* values = stackalloc AtkValue[4]
		{
			new AtkValue
			{
				Type = AtkValueType.Int,
				Int = 0
			},
			new AtkValue
			{
				Type = AtkValueType.Int,
				Int = _shop.ItemForSale.Position
			},
			new AtkValue
			{
				Type = AtkValueType.Int,
				Int = buyNow
			},
			new AtkValue
			{
				Type = AtkValueType.Undefined,
				Int = 0
			}
		};
		addonShop->FireCallback(4u, values);
	}

	private unsafe void SwitchToCurrentStockTab(AtkUnitBase* addonShop)
	{
		AtkValue* values = stackalloc AtkValue[3]
		{
			new AtkValue
			{
				Type = AtkValueType.Int,
				Int = 1
			},
			new AtkValue
			{
				Type = AtkValueType.Int,
				Int = -1
			},
			new AtkValue
			{
				Type = AtkValueType.Int,
				Int = -1
			}
		};
		addonShop->FireCallback(3u, values);
	}

	public void SaveExternalPluginState()
	{
	}

	public unsafe void RestoreExternalPluginState()
	{
		if (_gameGui.TryGetAddonByName<AtkUnitBase>("Shop", out var addonPtr))
		{
			addonPtr->FireCallbackInt(-1);
		}
	}
}