/*
* Copyright (c) 2022 Vaughn Nugent
* 
* Library: VNLib
* Package: Emails.Transactional.Client
* File: ValidationFailedException.cs 
*
* ValidationFailedException.cs is part of Emails.Transactional.Client which is part of the larger 
* VNLib collection of libraries and utilities.
*
* Emails.Transactional.Client is free software: you can redistribute it and/or modify 
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation, either version 2 of the License,
* or (at your option) any later version.
*
* Emails.Transactional.Client is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License 
* along with Emails.Transactional.Client. If not, see http://www.gnu.org/licenses/.
*/

using System;
using System.Linq;
using System.Collections.Generic;
using System.Text;

#nullable enable

namespace Emails.Transactional.Client.Exceptions
{
    /// <summary>
    /// Raised when server message validation failed
    /// </summary>
    public class ValidationFailedException : InvalidTransactionRequestException
    {
        ///<inheritdoc/>
        public ValidationFailedException()
        {}
        ///<inheritdoc/>
        public ValidationFailedException(string message) : base(message)
        {}
        ///<inheritdoc/>
        public ValidationFailedException(string message, Exception innerException) : base(message, innerException)
        {}

        /// <summary>
        /// A collection of validaion error messages
        /// </summary>
        public ICollection<ValidationErrorMessage>? ValidationErrors { get; init; }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="result"></param>
        public ValidationFailedException(TransactionResult result):base("Transaction data server validation failed")
        {
            this.ValidationErrors = result?.ValidationErrors;
        }

        ///<inheritdoc/>
        public override string Message
        {
            get
            {
                if(ValidationErrors == null)
                {
                    return base.Message;

                }
                StringBuilder sb = new(base.Message);
                sb.AppendLine();
                
                foreach(var kvp in ValidationErrors)
                {
                    sb.Append("Validation error: ");
                    sb.Append(kvp.PropertyName);
                    sb.Append(' ');
                    sb.AppendLine(kvp.ErrorMessage);
                }
                return sb.ToString();
            }
        }
    }
}