// Copyright (c) 2007 Omer Rauchwerger (a.k.a rauchy) (omer@rauchy.net)
// All rights reserved.
//
// This file is part of Regionerate.
// 
// This program 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 3 of the License, 
// or (at your option) any later version.
//
// This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

namespace Rauchy.Regionerate.Shared.Components.Rendering
{
    /// <summary>
    /// A textual sign which can be embedded in strings and later be identified in them.
    /// The <see cref="Wrapper"/> symbol wraps a text by adding a 
    /// prefix and suffix to the embedded text.
    /// </summary>
    public sealed class Wrapper : Symbol
    {
        #region Fields (2) 

        private readonly string _prefix;
        private readonly string _suffix;

        #endregion Fields 

        #region Constructors (1) 

        /// <summary>
        /// Initializes a new instance of the <see cref="Wrapper"/> class.
        /// </summary>
        /// <param name="prefix">The prefix.</param>
        /// <param name="suffix">The suffix.</param>
        public Wrapper( string prefix, string suffix )
        {
            _prefix = prefix;
            _suffix = suffix;
        }

        #endregion Constructors 

        #region Properties (2) 

        /// <summary>
        /// Gets the prefix.
        /// </summary>
        /// <value>The prefix.</value>
        public string Prefix
        {
            get
            {
                return _prefix;
            }
        }

        /// <summary>
        /// Gets the suffix.
        /// </summary>
        /// <value>The suffix.</value>
        public string Suffix
        {
            get
            {
                return _suffix;
            }
        }

        #endregion Properties 

        #region Methods (2) 

        // Public Methods (2) 

        /// <summary>
        /// Embeds the textual chariteristics of this <see cref="Wrapper"/> inside the specified text.
        /// </summary>
        /// <returns>
        /// The provided text with the <see cref="Wrapper"/> embedded in it.
        /// </returns>
        public override string Embed( string text )
        {
            string embeddedText = string.Format( " {0} {1} {2}", Prefix, text, Suffix );
            return embeddedText;
        }

        /// <summary>
        /// Determines whether the textual chariteristics of this <see cref="Wrapper"/> are embedded in the specified text.
        /// </summary>
        public override bool IsEmbeddedIn( string text )
        {
            bool startsWithSomethingElseThanPrefix = !text.StartsWith(Prefix);
            bool containsPrefix = text.Contains(Prefix);
            bool endsWithSuffix = text.TrimEnd().EndsWith(Suffix);
            bool prefixIsBeforeSuffix = text.IndexOf(Prefix) < text.LastIndexOf(Suffix);
            bool isNotAnIndexer = !text.Contains("this") && text.IndexOf("this") < text.IndexOf(Prefix);          //PELTON: added.

            bool embeddedInText = startsWithSomethingElseThanPrefix && containsPrefix &&
                                  endsWithSuffix & prefixIsBeforeSuffix && isNotAnIndexer;                              //PELTON: added.

            return embeddedInText;
        }

        #endregion Methods 
    }
}