using System;
using Dalamud.Plugin.Services;
using LLib.Shop;
using Microsoft.Extensions.Logging;
using Questionable.Model.Questing;

namespace Questionable.Controller.GameUi;

internal sealed class GCShopHandler : IDisposable
{
	private enum GCShopState
	{
		Inactive,
		Purchasing,
		Completed
	}

	private readonly QuestController _questController;

	private readonly GrandCompanyShop _gcShop;

	private readonly IObjectTable _objectTable;

	private readonly IFramework _framework;

	private readonly ILogger<GCShopHandler> _logger;

	private GCShopState _state;

	private GCPurchaseInfo? _currentPurchase;

	private DateTime _lastActionTime = DateTime.MinValue;

	private bool _purchaseCompletedThisStep;

	public bool IsActive => _state != GCShopState.Inactive;

	public GCShopHandler(QuestController questController, GrandCompanyShop gcShop, IObjectTable objectTable, IFramework framework, ILogger<GCShopHandler> logger)
	{
		_questController = questController;
		_gcShop = gcShop;
		_objectTable = objectTable;
		_framework = framework;
		_logger = logger;
		_gcShop.PurchaseCompleted += OnPurchaseCompleted;
		_framework.Update += OnFrameworkUpdate;
	}

	public void Dispose()
	{
		_framework.Update -= OnFrameworkUpdate;
		_gcShop.PurchaseCompleted -= OnPurchaseCompleted;
	}

	private void OnFrameworkUpdate(IFramework framework)
	{
		if (_objectTable.LocalPlayer == null)
		{
			return;
		}
		if (!_questController.IsRunning)
		{
			if (_state != GCShopState.Inactive)
			{
				Reset();
			}
			return;
		}
		CheckForGCPurchase();
		if (_state == GCShopState.Purchasing)
		{
			HandlePurchasing();
		}
		else if (_state == GCShopState.Completed)
		{
			_logger.LogInformation("GC shop purchase completed!");
			_state = GCShopState.Inactive;
			_lastActionTime = DateTime.MinValue;
		}
	}

	private void CheckForGCPurchase()
	{
		QuestController.QuestProgress currentQuest = _questController.CurrentQuest;
		if (currentQuest == null)
		{
			if (_currentPurchase != null)
			{
				Reset();
			}
			return;
		}
		GCPurchaseInfo gCPurchaseInfo = (currentQuest.Quest.FindSequence(currentQuest.Sequence)?.FindStep(currentQuest.Step))?.GCPurchase;
		if (gCPurchaseInfo == null)
		{
			if (_currentPurchase != null)
			{
				_currentPurchase = null;
				_purchaseCompletedThisStep = false;
			}
			if (_gcShop.IsOpen)
			{
				_logger.LogDebug("GC shop is open but current step has no GCPurchase. Quest={QuestId}, Seq={Sequence}, Step={Step}", currentQuest.Quest.Id, currentQuest.Sequence, currentQuest.Step);
			}
		}
		else
		{
			if (_currentPurchase != gCPurchaseInfo)
			{
				_currentPurchase = gCPurchaseInfo;
				_purchaseCompletedThisStep = false;
			}
			if (_gcShop.IsOpen && _state == GCShopState.Inactive && !_purchaseCompletedThisStep)
			{
				_logger.LogInformation("GC shop is open. Starting purchase of item {ItemId}.", gCPurchaseInfo.ItemId);
				_state = GCShopState.Purchasing;
			}
		}
	}

	private void HandlePurchasing()
	{
		if (_gcShop.IsOpen && _currentPurchase != null && !((DateTime.Now - _lastActionTime).TotalMilliseconds < 500.0))
		{
			if (!_gcShop.IsPurchaseInProgress)
			{
				_gcShop.StartPurchase(_currentPurchase.ItemId, _currentPurchase.RankTab, _currentPurchase.CategoryTab);
				_lastActionTime = DateTime.Now;
			}
			_gcShop.ProcessPurchase();
		}
	}

	private void OnPurchaseCompleted(object? sender, PurchaseCompletedEventArgs e)
	{
		if (_state == GCShopState.Purchasing && _currentPurchase != null && _questController.IsRunning && e.Success && e.ItemId == _currentPurchase.ItemId)
		{
			_logger.LogInformation("GC purchase of item {ItemId} completed successfully", e.ItemId);
			_gcShop.CloseShop();
			_purchaseCompletedThisStep = true;
			_state = GCShopState.Completed;
		}
	}

	private void Reset()
	{
		_state = GCShopState.Inactive;
		_currentPurchase = null;
		_lastActionTime = DateTime.MinValue;
		_purchaseCompletedThisStep = false;
	}
}