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using System;
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using System.Collections.Generic;
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namespace Jellyfin.Extensions
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{
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/// <summary>
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/// Static extensions for the <see cref="IReadOnlyList{T}"/> interface.
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/// </summary>
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public static class ReadOnlyListExtension
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{
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/// <summary>
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/// Finds the index of the desired item.
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/// </summary>
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/// <param name="source">The source list.</param>
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/// <param name="value">The value to fine.</param>
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/// <typeparam name="T">The type of item to find.</typeparam>
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/// <returns>Index if found, else -1.</returns>
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public static int IndexOf<T>(this IReadOnlyList<T> source, T value)
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{
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if (source is IList<T> list)
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{
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return list.IndexOf(value);
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}
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for (int i = 0; i < source.Count; i++)
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{
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if (Equals(value, source[i]))
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{
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return i;
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}
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}
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return -1;
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}
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/// <summary>
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/// Finds the index of the predicate.
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/// </summary>
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/// <param name="source">The source list.</param>
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/// <param name="match">The value to find.</param>
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/// <typeparam name="T">The type of item to find.</typeparam>
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/// <returns>Index if found, else -1.</returns>
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public static int FindIndex<T>(this IReadOnlyList<T> source, Predicate<T> match)
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{
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if (source is List<T> list)
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{
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return list.FindIndex(match);
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}
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for (int i = 0; i < source.Count; i++)
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{
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if (match(source[i]))
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{
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return i;
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}
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}
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return -1;
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}
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/// <summary>
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/// Get the first or default item from a list.
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/// </summary>
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/// <param name="source">The source list.</param>
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/// <typeparam name="T">The type of item.</typeparam>
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/// <returns>The first item or default if list is empty.</returns>
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public static T? FirstOrDefault<T>(this IReadOnlyList<T>? source)
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{
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if (source is null || source.Count == 0)
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{
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return default;
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}
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return source[0];
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}
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}
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}
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