using FFMpegCore.Enums;
using FFMpegCore.Helpers;
using FFMpegCore;
using System.IO;

namespace VideoConcat.Common.Tools
{
    internal class VideoCombine
    {
        /// <summary>
        /// 生成所有组合
        /// </summary>
        public static void GenerateCombinations(List<List<string>> videoLists, int index, List<string> currentCombination, List<List<string>> result)
        {
            if (index == videoLists.Count)
            {
                result.Add(new List<string>(currentCombination));
                return;
            }


            foreach (string video in videoLists[index])
            {
                currentCombination.Add(video);
                GenerateCombinations(videoLists, index + 1, currentCombination, result);
                currentCombination.RemoveAt(currentCombination.Count - 1);
            }
        }

        /// <summary>
        /// 清理临时文件
        /// </summary>
        public static void Cleanup(List<string> pathList)
        {
            foreach (var path in pathList)
            {
                if (File.Exists(path))
                {
                    File.Delete(path);
                }
            }
        }

        /// <summary>
        /// 将视频文件转换为ts格式
        /// </summary>
        public static string ConvertVideos(string videoPath)
        {

            var video = FFProbe.Analyse(videoPath);
            FFMpegHelper.ConversionSizeExceptionCheck(video);

            string _tempPath = Path.GetDirectoryName(videoPath) ?? "";

            //GlobalFFOptions.Current.TemporaryFilesFolder
            var destinationPath = Path.Combine(_tempPath, $"{Path.GetFileNameWithoutExtension(videoPath)}{FileExtension.Ts}");
            //Directory.CreateDirectory(GlobalFFOptions.Current.TemporaryFilesFolder);
            FFMpeg.Convert(videoPath, destinationPath, VideoType.Ts);
            return destinationPath;
        }
    }
}