#region License

// Copyright 2005-2019 Paul Kohler (https://github.com/paulkohler/minisqlquery). All rights reserved.
// This source code is made available under the terms of the GNU Lesser General Public License v3.0
// https://github.com/paulkohler/minisqlquery/blob/master/LICENSE
#endregion

using System.Collections.Generic;
using System.IO;
using NVelocity;
using NVelocity.App;
using NVelocity.Exception;

namespace MiniSqlQuery.Core.Template
{
    /// <summary>The n velocity wrapper.</summary>
    public class NVelocityWrapper : ITextFormatter
    {
        /// <summary>The format.</summary>
        /// <param name="text">The text.</param>
        /// <param name="items">The items.</param>
        /// <returns>The format.</returns>
        /// <exception cref="TemplateException"></exception>
        public string Format(string text, Dictionary<string, object> items)
        {
            try
            {
                VelocityContext velocityContext = new VelocityContext();

                if (items != null)
                {
                    foreach (var pair in items)
                    {
                        velocityContext.Put(pair.Key, pair.Value);
                    }
                }

                StringWriter sw = new StringWriter();
                VelocityEngine velocityEngine = new VelocityEngine();
                velocityEngine.Init();

                bool ok = velocityEngine.Evaluate(velocityContext, sw, "ContextTest.CaseInsensitive", text);

                if (!ok)
                {
                    throw new TemplateException("Template run error (try adding an extra newline at the end of the file)");
                }

                return sw.ToString();
            }
            catch (ParseErrorException parseErrorException)
            {
                throw new TemplateException(parseErrorException.Message, parseErrorException);
            }
        }
    }
}