using System.Collections.Generic;
using System.Linq;
using Questionable.Data;
using Questionable.Model;
using Questionable.Model.Questing;

namespace Questionable.Validation.Validators;

internal sealed class SinglePlayerInstanceValidator : IQuestValidator
{
	private readonly Dictionary<ElementId, List<byte>> _questIdToDutyIndexes;

	public SinglePlayerInstanceValidator(TerritoryData territoryData)
	{
		_questIdToDutyIndexes = (from x in territoryData.GetAllQuestsWithQuestBattles()
			group x by x.QuestId).ToDictionary((IGrouping<ElementId, (ElementId QuestId, byte Index, TerritoryData.ContentFinderConditionData Data)> x) => x.Key, (IGrouping<ElementId, (ElementId QuestId, byte Index, TerritoryData.ContentFinderConditionData Data)> x) => x.Select(((ElementId QuestId, byte Index, TerritoryData.ContentFinderConditionData Data) y) => y.Index).ToList());
	}

	public IEnumerable<ValidationIssue> Validate(Quest quest)
	{
		if (!_questIdToDutyIndexes.TryGetValue(quest.Id, out List<byte> value))
		{
			yield break;
		}
		foreach (byte index in value)
		{
			if (!quest.AllSteps().Any<(QuestSequence, int, QuestStep)>(((QuestSequence Sequence, int StepId, QuestStep Step) x) => x.Step.InteractionType == EInteractionType.SinglePlayerDuty && x.Step.SinglePlayerDutyIndex == index))
			{
				yield return new ValidationIssue
				{
					ElementId = quest.Id,
					Sequence = null,
					Step = null,
					Type = EIssueType.UnusedSinglePlayerInstance,
					Severity = EIssueSeverity.Error,
					Description = $"Single player instance {index} not used"
				};
			}
		}
	}
}