//
// DirectoryAlbumArtwork.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;
using System.Drawing;
using System.IO;
using ZenLibrary.RuleBase;

namespace ZenLibrary.Rules
{
    /// <summary>
    /// This rule will scan the directory and try to find a match among
    /// a specified list of file names (or search strings) that indicate
    /// the presence of album artwork. If it finds one or more of these files,
    /// the files will be scanned to see if they match the specified minimum
    /// image size requirements.
    /// </summary>
    class DirectoryAlbumArtwork : ConfigurableRule
    {
        private int artMinHeight = 500;
        private int artMinWidth = 500;
        private string artFileCombinedString = "Folder.JPG;Folder.JPEG;Folder.PNG";

        public override string Name 
        {
            get { return "Directory Has Album Artwork"; }
        }

        public override void Configure()
        {
            char[] splitChars = {';'};
            DirectoryAlbumArtworkConfig configWindow = new DirectoryAlbumArtworkConfig();
            configWindow.ArtHeightText.Text = artMinHeight.ToString();
            configWindow.ArtWidthText.Text = artMinWidth.ToString();           
            string[] artFiles = artFileCombinedString.Split(splitChars);
            foreach(string file in artFiles)
                configWindow.FileList.Items.Add(file);
            if (configWindow.ShowDialog() == true)
            {
                artMinHeight = int.Parse(configWindow.ArtHeightText.Text);
                artMinWidth = int.Parse(configWindow.ArtWidthText.Text);
                artFileCombinedString = string.Empty;
                foreach (string file in configWindow.FileList.Items)
                {
                    artFileCombinedString += file + ";";
                }
            }
            Config.Instance.SaveConfig();            
        }

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

        protected override void WriteCustomConfigAttributes(System.Xml.XmlWriter writer)
        {
            writer.WriteAttributeString("ArtHeight", artMinHeight.ToString());
            writer.WriteAttributeString("ArtWidth", artMinWidth.ToString());
            writer.WriteAttributeString("ArtFiles", artFileCombinedString);
            base.WriteCustomConfigAttributes(writer);
        }

        protected override void ReadCustomConfigAttributes(System.Xml.XmlReader reader)
        {
            artMinHeight = int.Parse(reader["ArtHeight"]);
            artMinWidth = int.Parse(reader["ArtWidth"]);
            artFileCombinedString = reader["ArtFiles"];
            base.ReadCustomConfigAttributes(reader);
        }


        public override RuleTestResult RunTest(DirectoryInfo directoryInfo, FileInfo fileInfo)
        {
            bool foundImage = false;
            bool imageMeetsSizeRequirements = false;
            int artWidth = 0;
            int artHeight = 0;
            char[] splitChars = {';'};
            string[] artFiles = artFileCombinedString.Split(splitChars);
            foreach (string artFileSearchString in artFiles)
            {
                FileInfo[] files = directoryInfo.GetFiles(artFileSearchString);
                if (files.Length > 0)
                {
                    foundImage = true;
                    foreach (FileInfo file in files)
                    {
                        using (Image image = Image.FromFile(file.FullName))
                        {
                            artWidth = Math.Max(artWidth, image.Width);
                            artHeight = Math.Max(artHeight, image.Height);
                            if (image.Width >= artMinWidth && image.Height >= artMinHeight)
                            {
                                imageMeetsSizeRequirements = true;
                                break;
                            }
                        }
                     }
                    if (imageMeetsSizeRequirements)
                        break;
                }
            }

            if (foundImage && imageMeetsSizeRequirements)
            {
                RuleTestResult result = new RuleTestResult();
                result.TestPassed = true;
                return result;
            }
            else if (foundImage && !imageMeetsSizeRequirements)
            {
                RuleTestResult result = new RuleTestResult();
                result.TestPassed = false;
                result.ResultPath = directoryInfo.FullName;
                result.RuleTestFailedString = string.Format("Directory \"{0}\" contains album artwork, but is only {1} x {2} pixels in size.", result.ResultPath, artWidth, artHeight);
                return result;
            }
            else
            {
                RuleTestResult result = new RuleTestResult();
                result.TestPassed = false;
                result.ResultPath = directoryInfo.FullName;
                result.RuleTestFailedString = string.Format("Directory \"{0}\" does not contain album artwork.", result.ResultPath);
                return result;
            }
        }
    }
}