using System.IO;
using System.Text;

namespace CommonLibrary
{
    public static class Extensions
    {
        /// <summary>경로를 일관된 포맷으로 변경</summary>
        /// <param name="paths">경로 리스트들</param>
        /// <returns>폴더 구분자가 / 로 일관되게 변경된 경로</returns>
        public static string PathCombine(params string[] paths)
        {
            if (paths == null || paths.Length == 0)
                return string.Empty;

            var sb = new StringBuilder();
            for (int i = 0; i < paths.Length; i++)
            {
                if (string.IsNullOrEmpty(paths[i]))
                    continue;

                var part = paths[i].Replace("\\", "/").Trim('/');
                if (sb.Length > 0)
                    sb.Append('/');

                sb.Append(part);
            }
            return sb.ToString();
        }

        public static bool IsDefault<T>(ref this T data) where T : struct
=> default(T).Equals(data);

        public static void DeepMove(this DirectoryInfo sourceDirectoryInfo, DirectoryInfo targetDirectoryInfo)
        {
            if (!sourceDirectoryInfo.Exists) return;

            if (sourceDirectoryInfo.Root.Name == targetDirectoryInfo.Root.Name)
            {
                sourceDirectoryInfo.MoveTo(targetDirectoryInfo.FullName);
            }
            else
            {
                var fileInfos = sourceDirectoryInfo.GetFiles("*", SearchOption.AllDirectories);

                foreach (var file in fileInfos)
                {
                    var targetDirectory = new DirectoryInfo(file.DirectoryName.Replace(sourceDirectoryInfo.FullName, targetDirectoryInfo.FullName));
                    targetDirectory.Create();
                    var targetFileName = System.IO.Path.Combine(targetDirectory.FullName, file.Name);

                    file.CopyTo(targetFileName, true);
                }

                sourceDirectoryInfo.Delete(true);
            }
        }
    }
}