// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using Microsoft.Build.Framework;
 
namespace Microsoft.Build.Tasks
{
    /// <summary>
    /// Extension methods for <see cref="TaskEnvironment"/> and <see cref="AbsolutePath"/> used by built-in tasks.
    /// </summary>
    internal static class TaskEnvironmentExtensions
    {
        /// <summary>
        /// Absolutizes each non-empty path in the array using <see cref="TaskEnvironment.GetAbsolutePath"/>.
        /// Returns <see langword="null"/> if <paramref name="paths"/> is <see langword="null"/>.
        /// Empty or null entries are passed through unchanged.
        /// </summary>
        internal static AbsolutePath[]? GetAbsolutePathsOrNull(this TaskEnvironment taskEnvironment, string[]? paths)
        {
            if (paths is null)
            {
                return null;
            }
 
            var result = new AbsolutePath[paths.Length];
            for (int i = 0; i < paths.Length; i++)
            {
                result[i] = string.IsNullOrEmpty(paths[i])
                    ? new AbsolutePath(paths[i], ignoreRootedCheck: true)
                    : taskEnvironment.GetAbsolutePath(paths[i]);
            }
 
            return result;
        }
 
        /// <summary>
        /// Converts an array of <see cref="AbsolutePath"/> to a string array.
        /// Returns <see langword="null"/> if <paramref name="paths"/> is <see langword="null"/>.
        /// </summary>
        internal static string[]? ToStringArray(this AbsolutePath[]? paths)
        {
            if (paths is null)
            {
                return null;
            }
 
            var result = new string[paths.Length];
            for (int i = 0; i < paths.Length; i++)
            {
                result[i] = paths[i].Value;
            }
 
            return result;
        }
    }
}