// Copyright (c) Six Labors.
// Licensed under the Six Labors Split License.

namespace SixLabors.ImageSharp.Tests;

public static class ArrayHelper
{
    /// <summary>
    /// Concatenates multiple arrays of the same type into one.
    /// </summary>
    /// <typeparam name="T">The array type</typeparam>
    /// <param name="arrays">The arrays to concatenate. The order is kept</param>
    /// <returns>The concatenated array</returns>
    public static T[] Concat<T>(params T[][] arrays)
    {
        T[] result = new T[arrays.Sum(t => t.Length)];
        int offset = 0;
        for (int i = 0; i < arrays.Length; i++)
        {
            arrays[i].CopyTo(result, offset);
            offset += arrays[i].Length;
        }

        return result;
    }

    /// <summary>
    /// Creates an array filled with the given value.
    /// </summary>
    /// <typeparam name="T">The array type</typeparam>
    /// <param name="value">The value to fill the array with</param>
    /// <param name="length">The wanted length of the array</param>
    /// <returns>The created array filled with the given value</returns>
    public static T[] Fill<T>(T value, int length)
    {
        T[] result = new T[length];
        for (int i = 0; i < length; i++)
        {
            result[i] = value;
        }

        return result;
    }

    /// <summary>
    /// Creates a string from a character with a given length.
    /// </summary>
    /// <param name="value">The character to fill the string with</param>
    /// <param name="length">The wanted length of the string</param>
    /// <returns>The filled string</returns>
    public static string Fill(char value, int length)
    {
        return string.Empty.PadRight(length, value);
    }
}