//
// BandTag.cs
//
// Author:
//   Jacob Johnston (jacobj@inchoatethoughts.com)
//
// Copyright (C) 2009 Jacob Johnston
// 
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser 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 Lesser 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/>.

using System.IO;

namespace ZenLibrary.RuleBase
{
    /// <summary>
    /// This rule is designed to make sure the AlbumArtist tag matches the
    /// Artist tag. Some media players index bands by the "Artist" tag
    /// while others use "AlbumArtist." The only time when these shouldn't
    /// match is when the "AlbumArtist" tag has "Various Artists" as its
    /// entry, indicating the album is a compilation.
    /// </summary>
    class BandTag : Rule
    {
        public override string Name
        {
            get { return "Album Artist Tag Matches Artist Tag"; }
        }

        public override TestType TestType
        {
            get { return TestType.FileScan; }
        }

        public override RuleTestResult RunTest(DirectoryInfo directoryInfo, FileInfo fileInfo)
        {
            TagLib.File file = TagLib.File.Create(fileInfo.FullName);
            if (file.Tag.AlbumArtists.Length > 0 && file.Tag.Performers.Length > 0 && 
                (file.Tag.AlbumArtists[0].CompareTo(file.Tag.Performers[0]) == 0 || file.Tag.AlbumArtists[0].CompareTo("Various Artists") == 0))
            {
                RuleTestResult result = new RuleTestResult();
                result.TestPassed = true;
                return result;
            }
            else
            {
                RuleTestResult result = new RuleTestResult();
                result.TestPassed = false;
                result.ResultPath = fileInfo.FullName;
                result.RuleTestFailedString = string.Format("The \"Album Artist\" tag does not match \"Artist\" tag in \"{0}\"", result.ResultPath);
                return result;
            }
        }
    }
}