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

namespace Questionable.Validation.Validators;

internal sealed class NextQuestValidator : IQuestValidator
{
	public IEnumerable<ValidationIssue> Validate(Quest quest)
	{
		foreach (var item in from x in quest.AllSteps()
			where x.Step.NextQuestId == quest.Id
			select x)
		{
			yield return new ValidationIssue
			{
				ElementId = quest.Id,
				Sequence = item.Item1.Sequence,
				Step = item.Item2,
				Type = EIssueType.InvalidNextQuestId,
				Severity = EIssueSeverity.Error,
				Description = "Next quest should not reference itself"
			};
		}
	}
}