package com.ard.work.service.task;

import com.ard.common.utils.StringUtils;
import com.ard.common.utils.file.MimeTypeUtils;
import com.ard.oss.service.impl.OssServiceContext;
import com.ard.work.domain.entity.ArdMediaPic;
import com.ard.work.domain.entity.ArdMediaVideo;
import com.ard.work.mapper.ArdMediaPicMapper;
import com.ard.work.mapper.ArdMediaVideoMapper;
import com.ard.work.util.osSelect;
import lombok.extern.slf4j.Slf4j;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.nio.file.Files;
import java.nio.file.Path;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Set;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;

/**
 * 定时同步媒体任务
 *
 * @author ard
 */
@Component
@Slf4j
public class MediaTask {
    @Resource
    private ArdMediaPicMapper ardMediaPicMapper;
    @Resource
    private ArdMediaVideoMapper ardMediaVideoMapper;
    @Resource
    private OssServiceContext ossServiceContext;
    @Resource(name = "mediaVideoExecutor")
    private ThreadPoolTaskExecutor mediaVideoExecutor;
    @Resource(name = "mediaPicExecutor")
    private ThreadPoolTaskExecutor mediaPicExecutor;

    private final AtomicBoolean runningVideo = new AtomicBoolean(false);
    private final AtomicBoolean runningPic = new AtomicBoolean(false);
    @Scheduled(cron = "0/10 * * * * ?")
    public void syncVideoMediaUrl() {
        log.debug("开始同步视频媒体");
        if (!runningVideo.compareAndSet(false, true)) {
            log.debug("上一次同步还没完成，跳过本次调度");
            return;
        }
        try {
            while (true) {
                List<ArdMediaVideo> videos = ardMediaVideoMapper.selectPendingVideos(10);
                if (videos.isEmpty()) {
                    break; // 没有待处理视频，退出循环
                }
                for (ArdMediaVideo video : videos) {
                    int updated = ardMediaVideoMapper.markProcessing(video.getId());
                    if (updated != 1) continue;
                    mediaVideoExecutor.execute(() -> processOneVideo(video));
                }
                Thread.sleep(200);
            }
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
        } finally {
            runningVideo.set(false);
        }
    }
    @Scheduled(cron = "0/10 * * * * ?")
    public void syncPicMediaUrl() {
        log.warn("开始同步图片媒体");
        if (!runningPic.compareAndSet(false, true)) {
            log.warn("上一次同步还没完成，跳过本次调度");
            return;
        }
        try {
            while (true) {
                List<ArdMediaPic> pics = ardMediaPicMapper.selectPendingPics(10); // 查询待处理的图片
                if (pics.isEmpty()) {
                    break; // 没有待处理图片，退出循环
                }
                for (ArdMediaPic pic : pics) {
                    // 🔒 原子抢占：0 → 1
                    int updated = ardMediaPicMapper.markProcessing(pic.getId());
                    if (updated != 1) {
                        continue; // 已被别的任务抢占
                    }
                    mediaPicExecutor.execute(() -> processOnePic(pic));
                }
                // 短暂 sleep，避免无限循环CPU空转
                Thread.sleep(200);
            }
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
        } finally {
            runningPic.set(false);
        }
    }

    private void processOneVideo(ArdMediaVideo video) {
        int maxRetries = 3;       // 最大重试次数
        int retryDelay = 3000;    // 每次重试等待 3 秒
        int attempt = 0;

        while (attempt < maxRetries) {
            attempt++;
            try (InputStream is = openUrlInputStream(video.getSourceUrl())) {
                if (is != null) {
                    String mediaUrl = ossServiceContext.upload(
                            "record",
                            video.getTaskId() + "/" + video.getId() + ".mp4",
                            is,
                            MimeTypeUtils.VIDEO_MP4
                    );
                    video.setMediaUrl(mediaUrl);

                    // 生成视频缩略图
                    processVideoThumbnail(video);

                    video.setSyncStatus(2); // 成功
                    break; // 上传成功，退出循环
                } else {
                    log.warn("视频尚未生成，尝试重试 {}/{}", attempt, maxRetries);
                }
            } catch (Exception e) {
                log.error("视频同步异常 videoId={}, 尝试 {}/{}", video.getId(), attempt, maxRetries, e);
            }

            if (attempt < maxRetries) {
                try {
                    Thread.sleep(retryDelay);
                } catch (InterruptedException e) {
                    Thread.currentThread().interrupt();
                    break;
                }
            } else {
                video.setSyncStatus(3); // 达到最大重试仍失败
            }
        }

        video.setUpdateTime(new Date());
        try {
            ardMediaVideoMapper.updateArdMediaVideo(video);
        } catch (Exception e) {
            log.error("更新视频状态失败 videoId={}", video.getId(), e);
        }
    }

    private void processOnePic(ArdMediaPic pic) {
        int maxRetries = 3; // 最大重试次数
        int retryDelay = 2000; // 每次重试等待 2 秒
        int attempt = 0;

        while (attempt < maxRetries) {
            attempt++;
            try (InputStream inputStream = openUrlInputStream(pic.getSourceUrl())) {
                if (inputStream != null) {
                    String url = ossServiceContext.upload(
                            "pic",
                            pic.getTaskId() + "/" + pic.getId() + ".jpg",
                            inputStream,
                            MimeTypeUtils.IMAGE_JPG
                    );
                    pic.setMediaUrl(url);
                    pic.setSyncStatus(2); // 成功
                    break; // 上传成功，退出循环
                } else {
                    log.warn("图片尚未生成，尝试重试 {}/{}", attempt, maxRetries);
                }
            } catch (Exception e) {
                log.error("图片同步异常 taskId={}, photoId={}, 尝试 {}/{}", pic.getTaskId(), pic.getId(), attempt, maxRetries, e);
            }

            if (attempt < maxRetries) {
                try {
                    Thread.sleep(retryDelay);
                } catch (InterruptedException e) {
                    Thread.currentThread().interrupt();
                    break;
                }
            } else {
                pic.setSyncStatus(3); // 达到最大重试仍失败
            }
        }

        pic.setUpdateTime(new Date());
        try {
            ardMediaPicMapper.updatePic(pic);
        } catch (Exception e) {
            log.error("更新图片状态失败 photoId={}", pic.getId(), e);
        }
    }

    /**
     * 处理视频缩略图
     */
    private void processVideoThumbnail(ArdMediaVideo video) {
        // 生成缩略图
        try (ByteArrayInputStream in = generateThumbnail(video.getSourceUrl())) {
            String thumbUrl = ossServiceContext.upload(
                    "record",
                    video.getTaskId() + "/" + video.getId() + ".jpg",
                    in,
                    MimeTypeUtils.IMAGE_JPEG
            );
            video.setThumbnailUrl(thumbUrl);
        } catch (Exception e) {
            log.warn("视频缩略图生成或上传失败 taskId={}, videoId={}", video.getTaskId(), video.getId(), e);
        }
        // 获取文件大小
        try {
            long videoSize = getFileSizeFromUrl(video.getSourceUrl());
            video.setFileSize(videoSize);
        } catch (Exception e) {
            log.warn("获取视频大小失败 url={}", video.getSourceUrl(), e);
        }
    }

    private long getFileSizeFromUrl(String fileUrl) throws IOException {
        URL url = new URL(fileUrl);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("HEAD");
        conn.setConnectTimeout(5000);
        conn.setReadTimeout(5000);
        conn.connect();
        long size = conn.getContentLengthLong(); // 返回字节数
        conn.disconnect();
        return size;
    }

    private ByteArrayInputStream generateThumbnail(String videoFile) {

        String ffmpeg = osSelect.isWindows()
                ? "ffmpeg"
                : "/usr/local/ffmpeg/bin/ffmpeg";

        Path tempImg = null;
        try {
            tempImg = Files.createTempFile("thumb_", ".jpg");

            List<String> cmd = new ArrayList<>();
            cmd.add(ffmpeg);
            cmd.add("-y");
            cmd.add("-loglevel");
            cmd.add("error");
            cmd.add("-i");
            cmd.add(videoFile);
            cmd.add("-ss");
            cmd.add(String.valueOf(1));
            cmd.add("-vframes");
            cmd.add("1");
            cmd.add("-vf");
            cmd.add("scale=" + 200 + ":-1");
            cmd.add(tempImg.toAbsolutePath().toString());

            log.info("ffmpeg cmd: {}", String.join(" ", cmd));

            Process process = new ProcessBuilder(cmd).start();

            drain(process.getErrorStream());

            boolean finished = process.waitFor(15, TimeUnit.SECONDS); // 超时保护
            if (!finished) {
                process.destroyForcibly();
                throw new RuntimeException("ffmpeg timeout");
            }

            if (process.exitValue() != 0) {
                throw new RuntimeException("ffmpeg exit=" + process.exitValue());
            }

            byte[] data = Files.readAllBytes(tempImg);
            return new ByteArrayInputStream(data);

        } catch (Exception e) {
            throw new RuntimeException("生成缩略图失败", e);
        } finally {
            if (tempImg != null) {
                try {
                    Files.deleteIfExists(tempImg);
                } catch (IOException ignore) {
                }
            }
        }
    }

    private static void drain(InputStream is) {
        new Thread(() -> {
            try (BufferedReader br = new BufferedReader(new InputStreamReader(is))) {
                while (br.readLine() != null) {
                }
            } catch (IOException ignore) {
            }
        }, "ffmpeg-stderr").start();
    }

    /**
     * 将 URL 转成 InputStream
     *
     * @param fileUrl 文件 URL
     * @return InputStream，如果失败返回 null
     */
    private InputStream openUrlInputStream(String fileUrl) {
        try {
            URL url = new URL(fileUrl);
            // 支持 HTTPS 信任所有证书（如果需要访问自签名证书）
            if ("https".equalsIgnoreCase(url.getProtocol())) {
                TrustManager[] trustAllCerts = new TrustManager[]{
                        new X509TrustManager() {
                            @Override
                            public void checkClientTrusted(X509Certificate[] chain, String authType) {
                            }

                            @Override
                            public void checkServerTrusted(X509Certificate[] chain, String authType) {
                            }

                            @Override
                            public X509Certificate[] getAcceptedIssuers() {
                                return null;
                            }
                        }
                };
                SSLContext sc = SSLContext.getInstance("SSL");
                sc.init(null, trustAllCerts, new java.security.SecureRandom());
                HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
                HttpsURLConnection.setDefaultHostnameVerifier((hostname, session) -> true);
            }
            URLConnection connection = url.openConnection();
            connection.setConnectTimeout(5000);
            connection.setReadTimeout(10000);
            return connection.getInputStream();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
}