using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using JetBrains.Annotations;

namespace UnityEngine.Rendering
{
    /// <summary>
    /// A set of extension methods for collections
    /// </summary>
    public static class RemoveRangeExtensions
    {
        /// <summary>
        /// Tries to remove a range of elements from the list in the given range.
        /// </summary>
        /// <param name="list">The list to remove the range</param>
        /// <param name="index">The zero-based starting index of the range of elements to remove</param>
        /// <param name="count">The number of elements to remove.</param>
        /// <param name="error">The exception raised by the implementation</param>
        /// <typeparam name="TValue">The value type stored on the list</typeparam>
        /// <returns>True if succeed, false otherwise</returns>
        [CollectionAccess(CollectionAccessType.ModifyExistingContent)]
        [MustUseReturnValue]
        public static bool TryRemoveElementsInRange<TValue>([DisallowNull] this IList<TValue> list, int index, int count, [NotNullWhen(false)] out Exception error)
        {
            try
            {
                if (list is List<TValue> genericList)
                {
                    genericList.RemoveRange(index, count);
                }
                else
                {
                    if (index < 0) throw new ArgumentOutOfRangeException(nameof(index));
                    if (count < 0) throw new ArgumentOutOfRangeException(nameof(count));
                    if (list.Count - index < count) throw new ArgumentException("index and count do not denote a valid range of elements in the list");

                    for (var i = count; i > 0; --i)
                        list.RemoveAt(index);
                }
            }
            catch (Exception e)
            {
                error = e;
                return false;
            }

            error = null;
            return true;
        }
    }
}