using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Xml.Linq;



namespace ComicTool.Model

{

    public class ComicInfo : IComparer<Page>

    {

        public ComicInfo()

        {

            Writers = new HashSet<string>();

            Pages = new List<ComicInfoPage>();

        }



        public static ComicInfo Read(Stream xml)

        {

            if (xml == null)

            {

                return null;

            }

            var elements = XElement.Load(xml);

            ComicInfo info = new ComicInfo();

            info.Title = elements.Elements().SingleValue("Title");

            info.Writers.AddRange(elements.Elements().MultiValue("Writer"));

            var type = elements.Elements().SingleValue("Type");

            if (!type.IsNullOrEmpty())

            {

                info.ComicInfoType = type.ToEnum<ComicInfoType>().Value;

            }

            elements.Elements().Where(x => x.Name == "Pages").Single()

                .Elements().ForEach(page =>

                {

                    info.Pages.Add(ComicInfoPage.CreatePage(page));

                });

            return info;

        }



        public string Title

        {

            get;

            private set;

        }



        public ICollection<string> Writers

        {

            get;

            private set;

        }



        public ComicInfoType ComicInfoType

        {

            get;

            private set;

        }



        public IList<ComicInfoPage> Pages

        {

            get;

            private set;

        }



        public int Compare(Page x, Page y)

        {

            var xCip = Pages.Where(cip => cip.Uri == x.Name).SingleOrDefault();

            var yCip = Pages.Where(cip => cip.Uri == y.Name).SingleOrDefault();



            if ((xCip == null) && (yCip == null))

            {

                return x.CompareTo(y);

            }

            if (xCip == null)

            {

                return -1;

            }

            if (yCip == null)

            {

                return 1;

            }

            xCip.LoadPage(x);

            yCip.LoadPage(y);

            return xCip.Index.CompareTo(yCip.Index);

        }

    }



    public enum ComicInfoType

    {

        FileComic,

        WebComic,

    }



}