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

using BFR.Helpers;
using BFR.Operations.Attributes;

namespace BFR.Operations
{
    public class ReplaceOperationMode : OperationMode<ReplaceMode>
    {
        public bool IsPattern => Index == ReplaceMode.Pattern;
        public bool IsCharacters => Index == ReplaceMode.Characters;
        public bool IsFromNToN => Index == ReplaceMode.FromNToN;
        public bool IsFirstN => Index == ReplaceMode.FirstN;
        public bool IsLastN => Index == ReplaceMode.LastN;

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

        protected ReplaceOperationMode(ReplaceMode index, string name, string description) : 
            base(index, name, description) { }

        protected static ReplaceOperationMode[] All() => ((IEnumerable<ReplaceMode>)Enum.GetValues(typeof(ReplaceMode))).Select(x =>
            new ReplaceOperationMode(
                x,
                x.GetAttribute<DisplayNameAttribute>().DisplayName,
                x.GetAttribute<DescriptionAttribute>().Description
            )).ToArray();
    }

    public enum ReplaceMode
    {
        [DisplayName(nameof(Pattern)), Description("Replaces the specified pattern.")]
        Pattern,
        [DisplayName(nameof(Characters)), Description("Replaces each of the specified characters.")]
        Characters,
        [DisplayName("From N to N"), Description("Replaces everything in the specified range (zero-based indeces).")]
        FromNToN,
        [DisplayName("First N"), Description("Replaces the first N characters.")]
        FirstN,
        [DisplayName("Last N"), Description("Replaces the last N characters.")]
        LastN,
    }
}