using System;
using System.Collections.Generic;
using Json.Schema;

namespace Questionable.Validation;

internal static class SchemaValidationHelper
{
	internal readonly record struct ParsedError(string InstancePath, string PropertyPath, string Message);

	public static void CollectLeafErrors(EvaluationResults node, List<ParsedError> errors)
	{
		if (!node.IsValid)
		{
			Dictionary<string, string> errors2 = node.Errors;
			if (errors2 != null && errors2.Count > 0)
			{
				foreach (var (keyword, text3) in node.Errors)
				{
					if (!IsAggregateKeyword(keyword) && !string.IsNullOrWhiteSpace(text3))
					{
						string text4 = node.InstanceLocation.ToString();
						string rawPath = GetRawPath(text4);
						errors.Add(new ParsedError(text4 ?? string.Empty, FormatPath(rawPath), CleanMessage(text3)));
					}
				}
			}
		}
		List<EvaluationResults> details = node.Details;
		if (details == null || details.Count <= 0)
		{
			return;
		}
		foreach (EvaluationResults detail in node.Details)
		{
			if (!detail.IsValid)
			{
				CollectLeafErrors(detail, errors);
			}
		}
	}

	public static string FormatPath(string rawPath)
	{
		if (string.IsNullOrEmpty(rawPath))
		{
			return string.Empty;
		}
		string[] array = rawPath.Split('/');
		List<string> list = new List<string>();
		string[] array2 = array;
		foreach (string text in array2)
		{
			if (int.TryParse(text, out var result))
			{
				if (list.Count > 0)
				{
					list[list.Count - 1] += $"[{result}]";
				}
				else
				{
					list.Add($"[{result}]");
				}
			}
			else
			{
				list.Add(text);
			}
		}
		return string.Join(".", list);
	}

	public static string CleanMessage(string message)
	{
		return message.Replace("\\u0022", "\"", StringComparison.Ordinal).Replace("\\u0027", "'", StringComparison.Ordinal);
	}

	public static string? FormatQuestLocation(byte? sequence, int? step)
	{
		if (!sequence.HasValue)
		{
			return null;
		}
		if (!step.HasValue)
		{
			return $"Seq {sequence}";
		}
		return $"Seq {sequence}, Step {step}";
	}

	private static bool IsAggregateKeyword(string keyword)
	{
		switch (keyword)
		{
		case "oneOf":
		case "allOf":
		case "anyOf":
		case "else":
		case "then":
		case "if":
		case "not":
		case "prefixItems":
		case "contains":
			return true;
		default:
			return false;
		}
	}

	private static string GetRawPath(string? instancePath)
	{
		if (string.IsNullOrEmpty(instancePath))
		{
			return string.Empty;
		}
		if (instancePath.StartsWith('#'))
		{
			instancePath = instancePath.Substring(1);
		}
		if (instancePath.StartsWith('/'))
		{
			instancePath = instancePath.Substring(1);
		}
		return instancePath;
	}
}