//
// SampleRate.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 checks whether the MP3 has a sample rate
    /// greater than or equal to the user-specified minimum
    /// sample rate.
    /// </summary>
    class SampleRate : ConfigurableRule
    {
        private int minSampleRate = 44100;

        public override string Name
        {
            get { return "Minimum Sample Rate"; }
        }

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

        public override void Configure()
        {
            SampleRateConfig sampRateConfig = new SampleRateConfig();
            sampRateConfig.SampleRateCombo.SelectedItem = string.Format("{0} Hz", minSampleRate);

            if (sampRateConfig.ShowDialog() == true)
            {
                string selectedValue = sampRateConfig.SampleRateCombo.SelectedItem.ToString().Replace("Hz", "");
                minSampleRate = int.Parse(selectedValue);
            }
        }

        protected override void WriteCustomConfigAttributes(System.Xml.XmlWriter writer)
        {
            writer.WriteAttributeString("MinSampleRate", minSampleRate.ToString());
            base.WriteCustomConfigAttributes(writer);
        }

        protected override void ReadCustomConfigAttributes(System.Xml.XmlReader reader)
        {
            minSampleRate = int.Parse(reader["MinSampleRate"]);
            base.ReadCustomConfigAttributes(reader);
        }

        public override RuleTestResult RunTest(DirectoryInfo directoryInfo, FileInfo fileInfo)
        {
            TagLib.File file = TagLib.File.Create(fileInfo.FullName);
            int sampleRate = file.Properties.AudioSampleRate;
            if (sampleRate >= minSampleRate)
            {
                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("File \"{0}\" only has a sample rate of {1} Hz", result.ResultPath, sampleRate);
                return result;
            }
        }
    }
}