using System.Collections.Generic;

using System.Globalization;

using System.IO;

using System.Text.RegularExpressions;



namespace GDFlacTool.Common

{

    public class TagFromFileHelper

    {

        private readonly string _mask = string.Empty;

        private List<TagHelper> _tagHelpers = new List<TagHelper>();

        private int _tagCount;

        private int _nonTagCount;

        private readonly bool _replaceUnderscores;

        private readonly bool _useCase;

        private readonly CaseType _caseType;



        public TagFromFileHelper(string mask, bool replaceUnderscores, bool useCase, CaseType caseType)

        {

            _mask = mask;



            _replaceUnderscores = replaceUnderscores;



            _useCase = useCase;



            _caseType = caseType;



            _tagHelpers = TagsFromFileParser(_mask);

        }



        public List<TagHelper> GetTagHelper

        {

            get { return _tagHelpers; }

        }



        public int TagCount

        {

            get { return _tagCount; }

        }



        public int NonTagCount

        {

            get { return _nonTagCount; }

        }



        public List<TagHelper> Refresh(string mask)

        {

            _tagHelpers.Clear();



            _nonTagCount = 0;



            _tagCount = 0;



            _tagHelpers = TagsFromFileParser(mask);



            return _tagHelpers;

        }



        public List<TagFileObject> GetTagFromFilename(IList<Track> tracks, List<TagHelper> tagHelpers)

        {

            var ret = new List<TagFileObject>();



            foreach (Track track in tracks)

            {

                TagFileObject obj = CreateTags(Path.GetFileNameWithoutExtension(track.FullPath), tagHelpers);



                obj.FileName = track.FileName;



                ret.Add(obj);

            }



            return ret;

        }



        private TagFileObject CreateTags(string fileName, List<TagHelper> tagHelpers)

        {

            int pos = 0;



            string name;



            if (_replaceUnderscores)

            {

                name = fileName.Replace("_", " ");

            }

            else

            {

                name = fileName;

            }



            //string name = fileName;



            var obj = new TagFileObject();



            if(!tagHelpers[0].Variable.StartsWith("%"))

            {

                if(name.StartsWith(tagHelpers[0].Variable))

                {

                    name = name.Remove(0, tagHelpers[0].Variable.Length);

                    

                    pos = 1;

                }

            }



            for (int i = pos; i < tagHelpers.Count; i++)

            {

                string separator = string.Empty;



                string tagType = tagHelpers[i].TagType;



                if (i + 1 < tagHelpers.Count)

                {

                    if(!tagHelpers[i + 1].IsTag)

                    {

                        separator = tagHelpers[i + 1].Variable;



                        i++;

                    }

                }



                string strTemp = separator.Replace("(", "\\(");



                strTemp = strTemp.Replace(")", "\\)");



                string[] value = Regex.Split(name, strTemp, RegexOptions.None);



                string tag;



                if(i == tagHelpers.Count - 1 && string.IsNullOrEmpty(separator))

                {

                    if(tagType == TagType.Remover)

                    {

                        tag = string.Empty;

                    }

                    else

                    {

                        tag = name;

                    }

                }

                else

                {

                    tag = value[0];



                    int lengt = tag.Length + separator.Length;



                    if(lengt <= name.Length)

                    {

                        name = name.Remove(0, lengt);

                    }

                    else

                    {

                        name = string.Empty;

                    }

                }



                //if(_replaceUnderscores)

                //{

                //    tag = tag.Replace("_", " ");

                //}



                if(_useCase)

                {

                    tag = CheckCase(tag, _caseType);

                }



                switch(tagType)

                {

                    case "ARTIST":

                        obj.Artist = tag;

                        break;

                    case "ALBUM":

                        obj.Album = tag;

                        break;

                    case "TITLE":

                        obj.Title = tag;

                        break;

                    case "DATE":

                        obj.Year = tag;

                        break;

                    case "TRACKNUMBER":

                        obj.Track = tag;

                        break;

                    case "DISCNUMBER":

                        obj.Disc = tag;

                        break;

                    case "GENRE":

                        obj.Genre = tag;

                        break;

                    case "COMMENT":

                        obj.Comment = tag;

                        break;

                    case "ALBUMARTIST":

                        obj.AlbumArtist = tag;

                        break;

                    case "CATALOG NUMBER":

                        obj.Catalog = tag;

                        break;

                }

            }



            return obj;

        }



        private string CheckCase(string text, CaseType type)

        {

            TextInfo myTI = new CultureInfo("en-US", false).TextInfo;



            string value = text;



            if (type != CaseType.None)

            {

                if (type == CaseType.Lower)

                {

                    value = myTI.ToLower(value);

                }



                if (type == CaseType.Upper)

                {

                    value = myTI.ToUpper(value);

                }



                if (type == CaseType.FirstLetter)

                {

                    value = myTI.ToTitleCase(value.ToLower());

                }



                if (type == CaseType.FirstWord)

                {

                    value = value.ToLower().ToUpperFirstLetter();

                }

            }



            return value;

        }



        private List<TagHelper> TagsFromFileParser(string mask)

        {

            string nonVarChar = string.Empty;

            bool isVarChar = false;

            var list = new List<TagHelper>();



            if(mask.Length == 0)

                return null;



            foreach (char chr in mask)

            {

                if(chr == '%')

                {

                    isVarChar = true;

                }

                else

                {

                    if(isVarChar)

                    {

                        if(!string.IsNullOrEmpty(nonVarChar))

                        {

                            list.Add(GetTagType(nonVarChar));

                            nonVarChar = string.Empty;



                            _nonTagCount = NonTagCount + 1;

                        }



                        list.Add( GetTagType("%" + chr));



                        _tagCount = TagCount + 1;



                        isVarChar = false;

                    }

                    else

                    {

                        nonVarChar += chr;

                    }

                }

            }



            if(!string.IsNullOrEmpty(nonVarChar))

            {

                list.Add(GetTagType(nonVarChar));

            }



            return list;

        }



        private TagHelper GetTagType(string variable)

        {

            switch (variable)

            {

                case "%1":

                    return new TagHelper("%1", TagType.Artist, "Artist", "Artist", true, 200);

                case "%2":

                    return new TagHelper("%2", TagType.Title, "Title", "Title", true, 200);

                case "%3":

                    return new TagHelper("%3", TagType.Album, "Album", "Album", true, 200);

                case "%4":

                    return new TagHelper("%4", TagType.Year, "Year", "Year", true, 40);

                case "%5":

                    return new TagHelper("%5", TagType.Genre, "Genre", "Genre", true, 80);

                case "%6":

                    return new TagHelper("%6", TagType.Tracknumber, "Track", "Track", true, 40);

                case "%7":

                    return new TagHelper("%7", TagType.Discnumber, "Disc", "Disc", true, 40);

                case "%C":

                    return new TagHelper("%C", TagType.Comment, "Comment", "Comment", true, 200);

                case "%A":

                    return new TagHelper("%A", TagType.Albumartist, "Album Artist", "AlbumArtist", true, 200);

                case "%G":

                    return new TagHelper("%G", TagType.CatalogNumber, "Catalog", "Catalog", true, 50);

                case "%d":

                    return new TagHelper("%d", TagType.Remover, "", "", true, 0);

                default:

                    return new TagHelper(variable, string.Empty, string.Empty, string.Empty, false, 0);

            }

        }

    }



    public class TagHelper

    {

        public TagHelper(string variable, string tagType, string name, string aspectName, bool isTag, int columnWidth)

        {

            Variable = variable;

            TagType = tagType;

            Name = name;

            IsTag = isTag;

            ColumnWidth = columnWidth;

            AspectName = aspectName;

        }



        public string AspectName { get; set; }



        public bool IsTag { get; set; }



        public string Variable { get; set; }



        public string TagType { get; set; }



        public string Name { get; set; }



        public int ColumnWidth { get; set; }

    }



    public class TagFileObject

    {

        public string FileName { get; set; }



        public string Artist { get; set; }



        public string Title { get; set; }



        public string Album { get; set; }



        public string Year { get; set; }



        public string Genre { get; set; }



        public string Track { get; set; }



        public string Disc { get; set; }



        public string Comment { get; set; }



        public string AlbumArtist { get; set; }



        public string Catalog { get; set; }

    }

}