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

namespace Questionable.Validation.Validators;

internal sealed class UniqueSinglePlayerInstanceValidator : IQuestValidator
{
	public IEnumerable<ValidationIssue> Validate(Quest quest)
	{
		List<(QuestSequence, int, byte)> list = (from x in quest.AllSteps()
			where x.Step.InteractionType == EInteractionType.SinglePlayerDuty
			select (Sequence: x.Sequence, StepId: x.StepId, SinglePlayerDutyIndex: x.Step.SinglePlayerDutyIndex)).ToList();
		if (list.DistinctBy<(QuestSequence, int, byte), byte>(((QuestSequence Sequence, int StepId, byte SinglePlayerDutyIndex) x) => x.SinglePlayerDutyIndex).Count() >= list.Count)
		{
			yield break;
		}
		foreach (var item in list)
		{
			yield return new ValidationIssue
			{
				ElementId = quest.Id,
				Sequence = item.Item1.Sequence,
				Step = item.Item2,
				Type = EIssueType.DuplicateSinglePlayerInstance,
				Severity = EIssueSeverity.Error,
				Description = $"Duplicate singleplayer duty index: {item.Item3}"
			};
		}
	}
}