using System;
using System.Collections.Generic;
using System.Linq;
using Questionable.Controller.Steps.Common;
using Questionable.Controller.Steps.Shared;
using Questionable.Controller.Utils;
using Questionable.Functions;
using Questionable.Model;
using Questionable.Model.Questing;

namespace Questionable.Controller.Steps.Interactions;

internal static class Combat
{
	internal sealed class Factory(GameFunctions gameFunctions) : ITaskFactory
	{
		public IEnumerable<ITask> CreateAllTasks(Quest quest, QuestSequence sequence, QuestStep step)
		{
			if (step.InteractionType != EInteractionType.Combat)
			{
				yield break;
			}
			ArgumentNullException.ThrowIfNull(step.EnemySpawnType, "step.EnemySpawnType");
			if (gameFunctions.GetMountId() != 128 && gameFunctions.GetMountId() != 147)
			{
				yield return new Mount.UnmountTask();
			}
			if (step.CombatDelaySecondsAtStart.HasValue)
			{
				yield return new WaitAtStart.WaitDelay(TimeSpan.FromSeconds(step.CombatDelaySecondsAtStart.Value));
			}
			switch (step.EnemySpawnType)
			{
			case EEnemySpawnType.AfterInteraction:
				ArgumentNullException.ThrowIfNull(step.DataId, "step.DataId");
				yield return new Interact.Task(step.DataId.Value, quest, EInteractionType.None, SkipMarkerCheck: true);
				yield return new WaitAtEnd.WaitDelay(TimeSpan.FromSeconds(1L));
				yield return CreateTask(quest, sequence, step);
				break;
			case EEnemySpawnType.AfterItemUse:
				ArgumentNullException.ThrowIfNull(step.ItemId, "step.ItemId");
				if (step.GroundTarget == true)
				{
					if (step.DataId.HasValue)
					{
						yield return new UseItem.UseOnGround(quest.Id, step.DataId.Value, step.ItemId.Value, step.CompletionQuestVariablesFlags, StartingCombat: true);
					}
					else
					{
						ArgumentNullException.ThrowIfNull(step.Position, "step.Position");
						yield return new UseItem.UseOnPosition(quest.Id, step.Position.Value, step.ItemId.Value, step.CompletionQuestVariablesFlags, StartingCombat: true);
					}
				}
				else if (step.DataId.HasValue)
				{
					yield return new UseItem.UseOnObject(quest.Id, step.DataId.Value, step.ItemId.Value, step.CompletionQuestVariablesFlags, StartingCombat: true);
				}
				else
				{
					yield return new UseItem.UseOnSelf(quest.Id, step.ItemId.Value, step.CompletionQuestVariablesFlags, StartingCombat: true);
				}
				yield return new WaitAtEnd.WaitDelay(TimeSpan.FromSeconds(1L));
				yield return CreateTask(quest, sequence, step);
				break;
			case EEnemySpawnType.AfterAction:
				ArgumentNullException.ThrowIfNull(step.DataId, "step.DataId");
				ArgumentNullException.ThrowIfNull(step.Action, "step.Action");
				if (!step.Action.Value.RequiresMount())
				{
					yield return new Mount.UnmountTask();
				}
				yield return new Action.UseOnObject(step.DataId.Value, null, step.Action.Value, null);
				yield return new WaitAtEnd.WaitDelay(TimeSpan.FromSeconds(1L));
				yield return CreateTask(quest, sequence, step);
				break;
			case EEnemySpawnType.AfterEmote:
				ArgumentNullException.ThrowIfNull(step.Emote, "step.Emote");
				yield return new Mount.UnmountTask();
				if (step.DataId.HasValue)
				{
					yield return new Emote.UseOnObject(step.Emote.Value, step.DataId.Value);
				}
				else
				{
					yield return new Emote.UseOnSelf(step.Emote.Value);
				}
				yield return new WaitAtEnd.WaitDelay(TimeSpan.FromSeconds(1L));
				yield return CreateTask(quest, sequence, step);
				break;
			case EEnemySpawnType.AutoOnEnterArea:
				if (!step.CombatDelaySecondsAtStart.HasValue)
				{
					yield return new WaitAtEnd.WaitDelay(TimeSpan.FromSeconds(1L));
				}
				yield return CreateTask(quest, sequence, step);
				break;
			case EEnemySpawnType.OverworldEnemies:
			case EEnemySpawnType.FateEnemies:
				yield return CreateTask(quest, sequence, step);
				break;
			case EEnemySpawnType.FinishCombatIfAny:
				yield return CreateTask(quest, sequence, step);
				break;
			default:
				throw new ArgumentOutOfRangeException("step", $"Unknown spawn type {step.EnemySpawnType}");
			}
		}

		private static Task CreateTask(Quest quest, QuestSequence sequence, QuestStep step)
		{
			ArgumentNullException.ThrowIfNull(step.EnemySpawnType, "step.EnemySpawnType");
			bool isLastStep = sequence.Steps.Last() == step;
			return CreateTask(quest.Id, sequence.Sequence, isLastStep, step.EnemySpawnType.Value, step.KillEnemyDataIds, step.CompletionQuestVariablesFlags, step.ComplexCombatData, step.CombatItemUse);
		}

		internal static Task CreateTask(ElementId? elementId, int sequence, bool isLastStep, EEnemySpawnType enemySpawnType, IList<uint> killEnemyDataIds, IList<QuestWorkValue?> completionQuestVariablesFlags, IList<ComplexCombatData> complexCombatData, CombatItemUse? combatItemUse)
		{
			return new Task(new CombatController.CombatData
			{
				ElementId = elementId,
				Sequence = sequence,
				CompletionQuestVariablesFlags = completionQuestVariablesFlags,
				SpawnType = enemySpawnType,
				KillEnemyDataIds = killEnemyDataIds.ToList(),
				ComplexCombatDatas = complexCombatData.ToList(),
				CombatItemUse = combatItemUse
			}, completionQuestVariablesFlags, isLastStep);
		}
	}

	internal sealed record Task(CombatController.CombatData CombatData, IList<QuestWorkValue?> CompletionQuestVariableFlags, bool IsLastStep) : ITask
	{
		public override string ToString()
		{
			if (CombatData.SpawnType == EEnemySpawnType.FinishCombatIfAny)
			{
				return "HandleCombat(wait: not in combat, optional)";
			}
			if (QuestWorkUtils.HasCompletionFlags(CompletionQuestVariableFlags))
			{
				return "HandleCombat(wait: QW flags)";
			}
			if (IsLastStep)
			{
				return "HandleCombat(wait: next sequence)";
			}
			return "HandleCombat(wait: not in combat)";
		}
	}

	internal sealed class HandleCombat(CombatController combatController, QuestFunctions questFunctions) : TaskExecutor<Task>()
	{
		private CombatController.EStatus _status;

		protected override bool Start()
		{
			return combatController.Start(base.Task.CombatData);
		}

		public override ETaskResult Update()
		{
			_status = combatController.Update();
			if (_status != CombatController.EStatus.Complete)
			{
				return ETaskResult.StillRunning;
			}
			if (QuestWorkUtils.HasCompletionFlags(base.Task.CompletionQuestVariableFlags) && base.Task.CombatData.ElementId is QuestId elementId)
			{
				QuestProgressInfo questProgressInfo = questFunctions.GetQuestProgressInfo(elementId);
				if (questProgressInfo == null)
				{
					return ETaskResult.StillRunning;
				}
				if (QuestWorkUtils.MatchesQuestWork(base.Task.CompletionQuestVariableFlags, questProgressInfo))
				{
					return ETaskResult.TaskComplete;
				}
				return ETaskResult.StillRunning;
			}
			if (base.Task.IsLastStep)
			{
				return ETaskResult.StillRunning;
			}
			combatController.Stop("Combat task complete");
			return ETaskResult.TaskComplete;
		}

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