package com.ard.sample.utils;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 视频时长解析工具类（FFmpeg 命令行版）
 * 无需下载文件，直接解析远程 HTTPS 地址的 MP4 视频时长
 */
@Component
public class VideoDurationUtilFFmpeg {

    private static final Pattern DURATION_PATTERN = Pattern.compile("Duration: (\\d{2}):(\\d{2}):(\\d{2}\\.\\d{2})");

    /**
     * 获取远程 HTTPS 地址的 MP4 视频时长
     * @param videoHttpsUrl 视频 HTTPS 地址
     * @return 视频时长（秒，保留2位小数），解析失败返回 null
     */
    public double getRemoteMp4Duration(String videoHttpsUrl) {
        // 入参校验
        if (videoHttpsUrl == null || !videoHttpsUrl.trim().toLowerCase().startsWith("https")
                || !videoHttpsUrl.trim().toLowerCase().endsWith(".mp4")) {
            throw new IllegalArgumentException("无效的MP4视频HTTPS地址：" + videoHttpsUrl);
        }

        try {
            // 构建 FFmpeg 命令，直接解析远程 URL
            String[] command = {
                    "ffmpeg",
                    "-i", videoHttpsUrl,
                    "-hide_banner"
            };

            Process process = new ProcessBuilder(command)
                    .redirectErrorStream(true)
                    .start();

            BufferedReader reader = new BufferedReader(
                    new InputStreamReader(process.getInputStream())
            );

            String line;
            while ((line = reader.readLine()) != null) {
                Matcher matcher = DURATION_PATTERN.matcher(line);
                if (matcher.find()) {
                    int hours = Integer.parseInt(matcher.group(1));
                    int minutes = Integer.parseInt(matcher.group(2));
                    double seconds = Double.parseDouble(matcher.group(3));

                    double totalSeconds = hours * 3600 + minutes * 60 + seconds;

                    return totalSeconds;
//                    return new BigDecimal(totalSeconds)
//                            .setScale(2, RoundingMode.HALF_UP);
                }
            }

            // 等待进程结束
            process.waitFor();
            if (process.exitValue() != 0) {
                throw new RuntimeException("FFmpeg 执行失败，退出码：" + process.exitValue());
            }

        } catch (Exception e) {
            System.err.println("解析视频时长失败，URL：" + videoHttpsUrl + "，异常：" + e.getMessage());
        }
        return -1;
    }

//    // 测试方法（可删除）
//    public static void main(String[] args) {
//        VideoDurationUtilFFmpeg util = new VideoDurationUtilFFmpeg();
//
//        TimestampUtils _timestampUtils = new TimestampUtils();
//        // 替换为你的测试视频 URL
//        double duration = util.getRemoteMp4Duration("https://192.168.1.3:9001/dockfile/wayline/d16eb96c-a0cc-458f-852c-09dddd59827f/DJI_202602121540_002_d16eb96c-a0cc-458f-852c-09dddd59827f/DJI_20260212154239_0004_V.mp4");
//        long endTime=_timestampUtils.plusSecondsByMillis(System.currentTimeMillis(),duration);
//        if (duration != -1) {
//            System.out.println("视频时长：" + duration + " 秒");
//            System.out.println("视频结束时间：" + endTime);
//        } else {
//            System.out.println("解析失败");
//        }
//    }
}