using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using MediaBrowser.Model.Serialization;

namespace MediaBrowser.Controller.Entities
{
    /// <summary>
    /// Class Year
    /// </summary>
    public class Year : BaseItem, IItemByName
    {
        public override List<string> GetUserDataKeys()
        {
            var list = base.GetUserDataKeys();

            list.Insert(0, "Year-" + Name);
            return list;
        }

        /// <summary>
        /// Returns the folder containing the item.
        /// If the item is a folder, it returns the folder itself
        /// </summary>
        /// <value>The containing folder path.</value>
        [IgnoreDataMember]
        public override string ContainingFolderPath
        {
            get
            {
                return Path;
            }
        }

        [IgnoreDataMember]
        public override bool SupportsAncestors
        {
            get
            {
                return false;
            }
        }

        public override bool CanDelete()
        {
            return false;
        }

        /// <summary>
        /// Gets a value indicating whether this instance is owned item.
        /// </summary>
        /// <value><c>true</c> if this instance is owned item; otherwise, <c>false</c>.</value>
        [IgnoreDataMember]
        public override bool IsOwnedItem
        {
            get
            {
                return false;
            }
        }

        public override bool IsSaveLocalMetadataEnabled()
        {
            return true;
        }

        public IEnumerable<BaseItem> GetTaggedItems(IEnumerable<BaseItem> inputItems)
        {
            int year;

            var usCulture = new CultureInfo("en-US");

            if (!int.TryParse(Name, NumberStyles.Integer, usCulture, out year))
            {
                return inputItems;
            }

            return inputItems.Where(i => i.ProductionYear.HasValue && i.ProductionYear.Value == year);
        }

        public IEnumerable<BaseItem> GetTaggedItems(InternalItemsQuery query)
        {
            int year;

            var usCulture = new CultureInfo("en-US");

            if (!int.TryParse(Name, NumberStyles.Integer, usCulture, out year))
            {
                return new List<BaseItem>();
            }

            query.Years = new[] { year };

            return LibraryManager.GetItemList(query);
        }

        public int? GetYearValue()
        {
            int i;

            if (int.TryParse(Name, NumberStyles.Integer, CultureInfo.InvariantCulture, out i))
            {
                return i;
            }

            return null;
        }

        public Func<BaseItem, bool> GetItemFilter()
        {
            var val = GetYearValue();
            return i => i.ProductionYear.HasValue && val.HasValue && i.ProductionYear.Value == val.Value;
        }

        [IgnoreDataMember]
        public override bool SupportsPeople
        {
            get
            {
                return false;
            }
        }

        public static string GetPath(string name, bool normalizeName = true)
        {
            // Trim the period at the end because windows will have a hard time with that
            var validName = normalizeName ?
                FileSystem.GetValidFilename(name).Trim().TrimEnd('.') :
                name;

            return System.IO.Path.Combine(ConfigurationManager.ApplicationPaths.YearPath, validName);
        }

        private string GetRebasedPath()
        {
            return GetPath(System.IO.Path.GetFileName(Path), false);
        }

        public override bool RequiresRefresh()
        {
            var newPath = GetRebasedPath();
            if (!string.Equals(Path, newPath, StringComparison.Ordinal))
            {
                Logger.Debug("{0} path has changed from {1} to {2}", GetType().Name, Path, newPath);
                return true;
            }
            return base.RequiresRefresh();
        }

        /// <summary>
        /// This is called before any metadata refresh and returns true or false indicating if changes were made
        /// </summary>
        public override bool BeforeMetadataRefresh()
        {
            var hasChanges = base.BeforeMetadataRefresh();

            var newPath = GetRebasedPath();
            if (!string.Equals(Path, newPath, StringComparison.Ordinal))
            {
                Path = newPath;
                hasChanges = true;
            }

            return hasChanges;
        }
    }
}
