// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Linq;
using Microsoft.AspNetCore.Mvc.Core;
using Microsoft.AspNetCore.Mvc.ModelBinding;
 
namespace Microsoft.AspNetCore.Mvc;
 
/// <summary>
/// Defines a serializable container for storing ModelState information.
/// This information is stored as key/value pairs.
/// </summary>
public sealed class SerializableError : Dictionary<string, object>
{
    /// <summary>
    /// Initializes a new instance of the <see cref="SerializableError"/> class.
    /// </summary>
    public SerializableError()
        : base(StringComparer.OrdinalIgnoreCase)
    {
    }
 
    /// <summary>
    /// Creates a new instance of <see cref="SerializableError"/>.
    /// </summary>
    /// <param name="modelState"><see cref="ModelStateDictionary"/> containing the validation errors.</param>
    public SerializableError(ModelStateDictionary modelState)
        : this()
    {
        ArgumentNullException.ThrowIfNull(modelState);
 
        if (modelState.IsValid)
        {
            return;
        }
 
        foreach (var keyModelStatePair in modelState)
        {
            var key = keyModelStatePair.Key;
            var errors = keyModelStatePair.Value.Errors;
            if (errors != null && errors.Count > 0)
            {
                var errorMessages = errors.Select(error =>
                {
                    return string.IsNullOrEmpty(error.ErrorMessage) ?
                        Resources.SerializableError_DefaultError : error.ErrorMessage;
                }).ToArray();
 
                Add(key, errorMessages);
            }
        }
    }
}