using System;
using System.Linq;
using System.Collections.Generic;

using BFR.Helpers;

namespace BFR.Operations
{
    public class SortOperationMode : OperationMode<SortMode>
    {
        public bool IsAlphanumerical => Index == SortMode.Normal;
        public bool IsNatural => Index == SortMode.Natural;
        public bool IsLength => Index == SortMode.Length;
        public bool IsReverse => Index == SortMode.Reverse;

        public static readonly SortOperationMode[] Modes = All();

        protected static SortOperationMode[] All() => ((IEnumerable<SortMode>)Enum.GetValues(typeof(SortMode))).Select(x =>
            new SortOperationMode(
                x,
                x.GetAttribute<OperationModeAttribute>().DisplayName,
                x.GetAttribute<OperationModeAttribute>().Description
            )).ToArray();

        public SortOperationMode(SortMode index, string name, string description) :
            base(index, name, description)
        { }
    }

    public enum SortMode
    {
        [OperationMode(nameof(Normal), "Compares file names based on current culture.")]
        Normal,
        [OperationMode(nameof(Ordinal), "Compares each successive ordinal character in a string (each character as its ASCII number value).")]
        Ordinal,
        [OperationMode(nameof(Natural), "Sorts by natural sort order (numeric values grouped).")]
        Natural,
        [OperationMode(nameof(Length), "Sorts by file name length.")]
        Length,
        [OperationMode(nameof(Reverse), "Reverses the list order.")]
        Reverse,
    }

    public enum SortDirection
    {
        Ascending,
        Descending
    }
}