//
// BitRate.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 bit rate
    /// greater than or equal to the user-specified minimum
    /// bit rate. Or, if the user desires, if the MP3
    /// was encoded with a variable bit rate.
    /// </summary>
    class BitRate : ConfigurableRule
    {
        private int minBitRate = 160;
        private bool allowVBR = true;

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

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

        public override void Configure()
        {
            BitRateConfig bitRateConfig = new BitRateConfig();
            bitRateConfig.MinimumBitRateCombo.SelectedItem = string.Format("{0} kbps", minBitRate);
            bitRateConfig.AllowVBRCheck.IsChecked = allowVBR;
            if (bitRateConfig.ShowDialog() == true)
            {
                string selectedValue = bitRateConfig.MinimumBitRateCombo.SelectedItem.ToString().Replace("kbps", "");
                minBitRate = int.Parse(selectedValue);
                allowVBR = (bool)bitRateConfig.AllowVBRCheck.IsChecked;
            }
        }

        protected override void WriteCustomConfigAttributes(System.Xml.XmlWriter writer)
        {
            writer.WriteAttributeString("MinBitRate", minBitRate.ToString());
            writer.WriteAttributeString("AllowVBR", allowVBR.ToString());
            base.WriteCustomConfigAttributes(writer);
        }

        protected override void ReadCustomConfigAttributes(System.Xml.XmlReader reader)
        {
            minBitRate = int.Parse(reader["MinBitRate"]);
            allowVBR = bool.Parse(reader["AllowVBR"]);
            base.ReadCustomConfigAttributes(reader);
        }

        public override RuleTestResult RunTest(DirectoryInfo directoryInfo, FileInfo fileInfo)
        {
            TagLib.File file = TagLib.File.Create(fileInfo.FullName);
            int bitRate = file.Properties.AudioBitrate;
            bool isVBR = (allowVBR && file.Properties.Description.Contains("VBR"));
            if (isVBR || bitRate >= minBitRate)
            {
                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 bit rate of {1} kbps", result.ResultPath, bitRate);
                return result;
            }
        }
    }
}