using FFMpegCore;
using FFMpegCore.Enums;
using System;
using System.IO;
using System.Threading.Tasks;
using VideoConcat.Common.Tools;
using static System.Windows.Forms.DataFormats;

namespace VideoConcat.Services.Video
{
    public class VideoProcess
    {
        /// <summary>
        /// 同步删除视频指定帧和对应音频片段
        /// </summary>
        /// <param name="inputPath">输入文件路径</param>
        /// <param name="outputPath">输出文件路径</param>
        /// <param name="frameNumber">要删除的帧编号（从1开始）</param>
        /// <returns>操作是否成功</returns>
        public static async Task<bool> RemoveFrameRandomeAsync(string inputPath, string outputPath)
        {
            if (!File.Exists(inputPath))
                return false;

            try
            {
                // 1. 获取视频信息
                var mediaInfo = await FFProbe.AnalyseAsync(inputPath);
                var videoStream = mediaInfo.PrimaryVideoStream;
                if (videoStream == null)
                {
                    Console.WriteLine("没有找到视频流");
                    return false;
                }

                bool isHevc = videoStream.CodecName == "hevc";

                // 2. 创建临时目录
                string tempDir = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString());
                Directory.CreateDirectory(tempDir);

                if (isHevc)
                {
                    try
                    {

                        // 临时文件路径
                        string videoConvert = Path.Combine(tempDir, "convert.mp4");

                        await FFMpegArguments.FromFileInput(inputPath)
                            .OutputToFile(videoConvert, true, opt => // 设置输出格式
                                opt.WithVideoCodec("libx264")
                            ).ProcessAsynchronously();
                         mediaInfo = await FFProbe.AnalyseAsync(videoConvert);

                        inputPath = videoConvert;
                    }
                    catch (Exception)
                    {
                        File.Delete(outputPath);
                    }
                }

                // 视频总时长（秒）
                var totalDuration = mediaInfo.Duration.TotalSeconds;
                // 计算帧时间参数
                double frameRate = videoStream.FrameRate;
                double frameDuration = 1.0 / frameRate; // 一帧时长（秒）

                int totalFram = (int)(totalDuration * frameRate);
                // 2. 随机生成要删除的帧的时间点（避开最后一帧，防止越界）
                var random = new Random();
                var randomFrame = random.Next(20, totalFram - 10);

                double frameTime = (randomFrame - 1) * frameDuration; // 目标帧开始时间
                double nextFrameTime = frameTime + frameDuration; // 下一帧开始时间


                // 临时文件路径
                string videoPart1 = Path.Combine(tempDir, "video_part1.mp4");
                string videoPart2 = Path.Combine(tempDir, "video_part2.mp4");
                bool hasSubVideo1 = SubVideo(inputPath, videoPart1, 0, frameTime);
                bool hasSubVideo2 = SubVideo(inputPath, videoPart2, nextFrameTime, totalDuration);
                if (hasSubVideo1 && hasSubVideo2)
                {
                    return JoinVideo(outputPath, [videoPart1, videoPart2]);
                }
                return false;
            }
            catch (Exception ex)
            {
                LogUtils.Error("抽帧失败", ex);
                Console.WriteLine($"操作失败: {ex.Message}");
                return false;
            }
        }

        public static bool SubVideo(string inputPath, string outputPath, Double startSec, Double endSec)
        {
            return FFMpeg.SubVideo(inputPath, outputPath, TimeSpan.FromSeconds(startSec), TimeSpan.FromSeconds(endSec));
        }

        public static bool JoinVideo(string outPutPath, string[] videoParts)
        {
            return FFMpeg.Join(outPutPath, videoParts);
        }

    }
}