using System;
using Dalamud.Game.ClientState.Conditions;
using Dalamud.Plugin.Services;
using FFXIVClientStructs.FFXIV.Client.Game;
using LLib;
using LLib.Shop;
using Microsoft.Extensions.Logging;
using Questionable.Controller.Steps;
using Questionable.Functions;

namespace Questionable.Controller.CustomDelivery;

internal sealed class VendorPurchaseExecutor(GameFunctions gameFunctions, IGameGui gameGui, ICondition condition, ILogger<VendorPurchaseExecutor> logger) : TaskExecutor<VendorPurchaseTask>()
{
	private enum EState
	{
		InteractWithNpc,
		WaitForShopOrDialog,
		BuyItem,
		WaitForBuy,
		CloseShop,
		WaitForClose
	}

	private const long StateTimeoutMs = 15000L;

	private const long BuyConfirmationTimeoutMs = 2000L;

	private const int MaxBuyAttempts = 3;

	private EState _state;

	private Throttle _throttle;

	private int _purchaseIndex;

	private long _stateStartMs;

	private bool _failed;

	private int _countBeforeBuy;

	private int _buyAttempts;

	private bool _confirmationClicked;

	protected override bool Start()
	{
		_state = EState.InteractWithNpc;
		_throttle.Clear();
		_purchaseIndex = 0;
		_stateStartMs = Environment.TickCount64;
		_failed = false;
		_countBeforeBuy = 0;
		_buyAttempts = 0;
		_confirmationClicked = false;
		return true;
	}

	public unsafe override ETaskResult Update()
	{
		long num = Environment.TickCount64 - _stateStartMs;
		if (_state != EState.WaitForBuy && num > 15000)
		{
			logger.LogWarning("Vendor purchase timed out in state {State} after {Elapsed}ms, retrying", _state, num);
			return ETaskResult.RetryStep;
		}
		switch (_state)
		{
		case EState.InteractWithNpc:
			if (!_throttle.TryReset(1.0))
			{
				return ETaskResult.StillRunning;
			}
			if (gameFunctions.InteractWith(base.Task.VendorNpcId))
			{
				logger.LogDebug("Interacted with vendor NPC {NpcId}", base.Task.VendorNpcId);
				SetState(EState.WaitForShopOrDialog);
			}
			return ETaskResult.StillRunning;
		case EState.WaitForShopOrDialog:
			if (VendorPurchaseActions.IsShopReady(gameGui))
			{
				logger.LogDebug("Shop is ready, moving to BuyItem");
				SetState(EState.BuyItem);
			}
			else if (VendorPurchaseActions.IsDialogReady(gameGui))
			{
				if (!_throttle.TryReset(0.5))
				{
					return ETaskResult.StillRunning;
				}
				if (VendorPurchaseActions.TrySelectDialogOption(gameGui, base.Task.DialogOptionIndex))
				{
					logger.LogDebug("Selected dialog option {Index} to open shop", base.Task.DialogOptionIndex);
				}
			}
			return ETaskResult.StillRunning;
		case EState.BuyItem:
		{
			if (!_throttle.TryReset(0.5))
			{
				return ETaskResult.StillRunning;
			}
			VendorPurchaseTask.PurchaseItem purchaseItem2 = base.Task.Purchases[_purchaseIndex];
			int num2 = VendorPurchaseActions.FindItemDisplayIndex(gameGui, purchaseItem2.ItemId);
			if (num2 < 0)
			{
				logger.LogError("Item {ItemId} not found in shop display list", purchaseItem2.ItemId);
				_failed = true;
				SetState(EState.CloseShop);
				return ETaskResult.StillRunning;
			}
			_countBeforeBuy = InventoryManager.Instance()->GetInventoryItemCount(purchaseItem2.ItemId, isHq: false, checkEquipped: true, checkArmory: true, 0);
			if (VendorPurchaseActions.TryBuyItem(gameGui, num2, purchaseItem2.Quantity))
			{
				_buyAttempts++;
				_confirmationClicked = false;
				logger.LogDebug("Submitted purchase for item {ItemId} (display index {DisplayIndex}) x{Quantity}, attempt {Attempt}/{MaxAttempts} ({Current}/{Total})", purchaseItem2.ItemId, num2, purchaseItem2.Quantity, _buyAttempts, 3, _purchaseIndex + 1, base.Task.Purchases.Count);
				SetState(EState.WaitForBuy);
			}
			return ETaskResult.StillRunning;
		}
		case EState.WaitForBuy:
		{
			VendorPurchaseTask.PurchaseItem purchaseItem = base.Task.Purchases[_purchaseIndex];
			if (!_confirmationClicked && VendorPurchaseActions.TryConfirmPurchase(gameGui))
			{
				_confirmationClicked = true;
				logger.LogDebug("Confirmed purchase of item {ItemId}", purchaseItem.ItemId);
				SetState(EState.WaitForBuy);
				return ETaskResult.StillRunning;
			}
			int inventoryItemCount = InventoryManager.Instance()->GetInventoryItemCount(purchaseItem.ItemId, isHq: false, checkEquipped: true, checkArmory: true, 0);
			if (inventoryItemCount <= _countBeforeBuy)
			{
				if (num < 2000)
				{
					return ETaskResult.StillRunning;
				}
				if (_buyAttempts < 3)
				{
					logger.LogWarning("Purchase of item {ItemId} was not reflected in inventory; retrying ({Attempt}/{MaxAttempts})", purchaseItem.ItemId, _buyAttempts + 1, 3);
					SetState(EState.BuyItem);
					return ETaskResult.StillRunning;
				}
				logger.LogError("Purchase of item {ItemId} failed after {Attempts} attempts", purchaseItem.ItemId, _buyAttempts);
				_failed = true;
				SetState(EState.CloseShop);
				return ETaskResult.StillRunning;
			}
			if (!_throttle.TryReset(0.5))
			{
				return ETaskResult.StillRunning;
			}
			logger.LogDebug("Verified purchase of item {ItemId}: inventory {Before} -> {After}", purchaseItem.ItemId, _countBeforeBuy, inventoryItemCount);
			_purchaseIndex++;
			if (_purchaseIndex < base.Task.Purchases.Count)
			{
				_buyAttempts = 0;
				logger.LogDebug("Buying next item ({Index}/{Total})", _purchaseIndex + 1, base.Task.Purchases.Count);
				SetState(EState.BuyItem);
			}
			else
			{
				logger.LogDebug("All purchases complete, closing shop");
				SetState(EState.CloseShop);
			}
			return ETaskResult.StillRunning;
		}
		case EState.CloseShop:
			if (!_throttle.TryReset(0.5))
			{
				return ETaskResult.StillRunning;
			}
			if (VendorPurchaseActions.TryCloseShop(gameGui))
			{
				logger.LogDebug("Closing shop");
				SetState(EState.WaitForClose);
			}
			return ETaskResult.StillRunning;
		case EState.WaitForClose:
			if (VendorPurchaseActions.IsShopReady(gameGui))
			{
				return ETaskResult.StillRunning;
			}
			if (VendorPurchaseActions.IsDialogReady(gameGui))
			{
				if (!_throttle.TryReset(0.5))
				{
					return ETaskResult.StillRunning;
				}
				VendorPurchaseActions.TrySelectDialogOption(gameGui, -1);
				logger.LogDebug("Dismissing post-shop dialog");
				return ETaskResult.StillRunning;
			}
			if (!condition[ConditionFlag.OccupiedInEvent])
			{
				if (_failed)
				{
					logger.LogWarning("Shop closed after failed purchase, retrying");
					return ETaskResult.RetryStep;
				}
				logger.LogDebug("Shop closed, vendor purchase complete");
				return ETaskResult.TaskComplete;
			}
			return ETaskResult.StillRunning;
		default:
			return ETaskResult.StillRunning;
		}
	}

	private void SetState(EState state)
	{
		_state = state;
		_stateStartMs = Environment.TickCount64;
	}

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