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

namespace Questionable.Controller.CustomDelivery;

internal sealed class SatisfactionSupplyTurnInExecutor(GameFunctions gameFunctions, IGameGui gameGui, ICondition condition, ILogger<SatisfactionSupplyTurnInExecutor> logger) : TaskExecutor<SatisfactionSupplyTurnInTask>()
{
	private enum EPhase
	{
		InteractWithNpc,
		WaitForAddon,
		SelectSlot,
		ConfirmTrade,
		WaitForCutsceneStart,
		WaitForCutsceneEnd,
		CheckCompletion,
		Closing
	}

	private const long PhaseTimeoutMs = 15000L;

	private const long CutsceneTimeoutMs = 60000L;

	private Throttle _throttle;

	private EPhase _phase;

	private int _remaining;

	private int _lastUsedDeliveries;

	private long _phaseStartMs;

	protected override bool Start()
	{
		_phase = EPhase.InteractWithNpc;
		_remaining = base.Task.DeliveryCount;
		_lastUsedDeliveries = SatisfactionSupplyActions.GetNpcState(base.Task.NpcIndex).UsedDeliveries;
		_throttle.Clear();
		_phaseStartMs = Environment.TickCount64;
		logger.LogDebug("Starting satisfaction supply turn-in: npc={NpcIndex}, slot={Slot}, count={Count}", base.Task.NpcIndex, base.Task.Slot, base.Task.DeliveryCount);
		return true;
	}

	public override ETaskResult Update()
	{
		long num = Environment.TickCount64 - _phaseStartMs;
		if ((_phase != EPhase.WaitForCutsceneEnd) ? (num > 15000) : (num > 60000))
		{
			logger.LogWarning("Turn-in timed out in phase {Phase} after {Elapsed}ms, retrying", _phase, num);
			TryDismissResultAddon();
			SatisfactionSupplyActions.TryCloseSatisfactionSupply(gameGui);
			return ETaskResult.RetryStep;
		}
		switch (_phase)
		{
		case EPhase.InteractWithNpc:
			if (_throttle.TryReset(0.5) && base.Task.NpcDataId != 0 && gameFunctions.InteractWith(base.Task.NpcDataId))
			{
				logger.LogDebug("Interacted with delivery NPC {DataId}", base.Task.NpcDataId);
				SetPhase(EPhase.WaitForAddon);
			}
			break;
		case EPhase.WaitForAddon:
			if (_throttle.TryReset(0.5) && !TryDismissResultAddon())
			{
				if (SatisfactionSupplyActions.IsSatisfactionSupplyFullyReady(gameGui))
				{
					logger.LogDebug("SatisfactionSupply addon fully ready");
					SetPhase(EPhase.SelectSlot);
				}
				else if (VendorPurchaseActions.IsDialogReady(gameGui))
				{
					VendorPurchaseActions.TrySelectDialogOption(gameGui, 0);
					logger.LogDebug("Dismissed NPC dialog to reach SatisfactionSupply");
				}
				else if (SatisfactionSupplyActions.TryProgressTalk(gameGui))
				{
					logger.LogDebug("Progressed NPC dialog to reach SatisfactionSupply");
				}
			}
			break;
		case EPhase.SelectSlot:
			if (_throttle.TryReset(0.5))
			{
				if (!PlanStillMatchesRequest())
				{
					return ETaskResult.RetryStep;
				}
				if (SatisfactionSupplyActions.IsNpcTradeReady())
				{
					logger.LogDebug("NpcTrade agent ready");
					SetPhase(EPhase.ConfirmTrade);
				}
				else if (TryDismissResultAddon())
				{
					SetPhase(EPhase.InteractWithNpc);
				}
				else if (SatisfactionSupplyActions.IsSatisfactionSupplyFullyReady(gameGui))
				{
					SatisfactionSupplyActions.TrySelectDeliverySlot(gameGui, (int)base.Task.Slot);
					logger.LogDebug("Fired delivery slot {Slot} selection", base.Task.Slot);
				}
			}
			break;
		case EPhase.ConfirmTrade:
			if (_throttle.TryReset(0.5))
			{
				if (!HasRemainingItems())
				{
					logger.LogWarning("Planned item {ItemId} is no longer available for turn-in", base.Task.ItemId);
					return ETaskResult.RetryStep;
				}
				if (SatisfactionSupplyActions.TryConfirmTrade())
				{
					logger.LogDebug("Confirmed trade for slot {Slot}", base.Task.Slot);
					SetPhase(EPhase.WaitForCutsceneStart);
				}
			}
			break;
		case EPhase.WaitForCutsceneStart:
			if (HasDeliveryRegistered())
			{
				logger.LogDebug("Delivery registered before cutscene state was observed");
				SetPhase(EPhase.CheckCompletion);
			}
			else if (condition[ConditionFlag.OccupiedInCutSceneEvent])
			{
				logger.LogDebug("Cutscene started");
				SetPhase(EPhase.WaitForCutsceneEnd);
			}
			break;
		case EPhase.WaitForCutsceneEnd:
			if (!condition[ConditionFlag.OccupiedInCutSceneEvent])
			{
				logger.LogDebug("Cutscene ended");
				SetPhase(EPhase.CheckCompletion);
			}
			break;
		case EPhase.CheckCompletion:
		{
			int usedDeliveries = SatisfactionSupplyActions.GetNpcState(base.Task.NpcIndex).UsedDeliveries;
			if (usedDeliveries > _lastUsedDeliveries)
			{
				_remaining = Math.Max(0, _remaining - (usedDeliveries - _lastUsedDeliveries));
				_lastUsedDeliveries = usedDeliveries;
				int remainingAllowances = SatisfactionSupplyActions.GetRemainingAllowances();
				logger.LogDebug("Delivery complete, remaining={Remaining}, allowances={Allowances}", _remaining, remainingAllowances);
				if (_remaining > 0 && remainingAllowances > 0)
				{
					SetPhase(EPhase.WaitForAddon);
				}
				else
				{
					SetPhase(EPhase.Closing);
				}
			}
			break;
		}
		case EPhase.Closing:
			if (_throttle.TryReset(0.5) && !TryDismissResultAddon())
			{
				if (SatisfactionSupplyActions.TryCloseSatisfactionSupply(gameGui))
				{
					logger.LogDebug("Closed SatisfactionSupply addon");
					return ETaskResult.TaskComplete;
				}
				if (!SatisfactionSupplyActions.IsSatisfactionSupplyReady(gameGui))
				{
					logger.LogDebug("SatisfactionSupply addon already closed");
					return ETaskResult.TaskComplete;
				}
			}
			break;
		}
		return ETaskResult.StillRunning;
	}

	private bool TryDismissResultAddon()
	{
		if (!SatisfactionSupplyActions.IsSatisfactionSupplyResultVisible(gameGui))
		{
			return false;
		}
		SatisfactionSupplyActions.TryCloseSatisfactionSupplyResult(gameGui);
		logger.LogDebug("Closed rank-up result addon");
		return true;
	}

	private void SetPhase(EPhase phase)
	{
		_phase = phase;
		_phaseStartMs = Environment.TickCount64;
	}

	private bool HasDeliveryRegistered()
	{
		return SatisfactionSupplyActions.GetNpcState(base.Task.NpcIndex).UsedDeliveries > _lastUsedDeliveries;
	}

	private unsafe bool PlanStillMatchesRequest()
	{
		AgentSatisfactionSupply* ptr = AgentSatisfactionSupply.Instance();
		if (ptr == null || !ptr->IsAgentActive() || !ptr->NpcInfo.Valid || !ptr->NpcInfo.Initialized)
		{
			return true;
		}
		uint id = ptr->Items[(int)base.Task.Slot].Id;
		if (ptr->NpcInfo.Id == (uint)(base.Task.NpcIndex + 1) && id == base.Task.ItemId && HasRemainingItems())
		{
			return true;
		}
		logger.LogWarning("Turn-in plan no longer matches live request: NPC {NpcIndex}, slot {Slot}, planned item {PlannedItemId}, live item {LiveItemId}", base.Task.NpcIndex, base.Task.Slot, base.Task.ItemId, id);
		return false;
	}

	private unsafe bool HasRemainingItems()
	{
		InventoryManager* ptr = InventoryManager.Instance();
		if (ptr != null)
		{
			return ptr->GetInventoryItemCount(base.Task.ItemId, isHq: false, checkEquipped: true, checkArmory: true, (short)base.Task.Collectability) >= _remaining;
		}
		return false;
	}

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