package com.siwei.apply.utils;

import com.siwei.apply.domain.NodeAttachment;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.StringUtils;

import java.net.URI;
import java.security.MessageDigest;
import java.util.*;

/**
 * 服务类工具
 */
public class ServiceUtil {

    private static final long EXPIRY_TIME = 10 * 60 * 1000;  // 10 minutes in milliseconds
    private static final String SECRET_KEY = "siwei";  // Secret key for signature
    private static final String TIME_KEY = "?time=";  // time
    private static final String DOMAIN = "http://10.224.1.227:15000/prod-api/apply";  // doman

    /**
     * 获取指定目录下的子children list
     *
     * @param dirName        目录名称
     * @param nodeAttachment 附件信息
     * @return
     */
    public static List<Map<String, String>> getDirChildrenList(String dirName, NodeAttachment nodeAttachment) {
        List<Map<String, String>> list = new ArrayList<>();
        if (Objects.nonNull(nodeAttachment) && Objects.nonNull(nodeAttachment.getAttachment())) {
            Map<String, Object> attachment = nodeAttachment.getAttachment();
            //第一曾经children 所有目录list
            List<Map> childrenList = (List<Map>) attachment.get("children");
            if (CollectionUtils.isNotEmpty(childrenList)) {
                for (Map childMap : childrenList) {
                    String childName = (String) childMap.get("name");
                    //if (childName.equalsIgnoreCase(dirName)) {
                    if (StringUtils.containsIgnoreCase(childName, dirName)) {
                        list = (List<Map<String, String>>) childMap.get("children");
                        break;
                    }
                }
            }
        }
        return list;
    }


    public static Map<String, Object> getDirChildrenMap(String dirName, NodeAttachment nodeAttachment) {
        Map<String, Object> retMap = null;
        if (Objects.nonNull(nodeAttachment) && Objects.nonNull(nodeAttachment.getAttachment())) {
            Map<String, Object> attachment = nodeAttachment.getAttachment();
            //第一层级children 所有目录list
            List<Map> childrenList = (List<Map>) attachment.get("children");
            if (CollectionUtils.isNotEmpty(childrenList)) {
                for (Map childMap : childrenList) {
                    String childName = (String) childMap.get("name");
                    if (StringUtils.containsIgnoreCase(childName, dirName)) {
                        retMap = childMap;
                        break;
                    }
                }
            }
        }
        return retMap;
    }


    /**
     *
     * @param nodeAttachment
     * @throws Exception
     */
    public static void convertFilePath(NodeAttachment nodeAttachment) throws Exception {
        String attachmentId = nodeAttachment.getId();
        String timestamp = String.valueOf(System.currentTimeMillis());
        if (Objects.nonNull(nodeAttachment.getAttachment())) {
            Map<String, Object> attachment = nodeAttachment.getAttachment();
            //第一层级children 所有目录list
            List<Map> childrenList = (List<Map>) attachment.get("children");
            if (CollectionUtils.isNotEmpty(childrenList)) {
                for (Map childMap : childrenList) {
                    String childName = (String) childMap.get("name");
                    childMap.put("path", "--");//这里隐藏目录路径
                    List<Map<String, String>> list = (List<Map<String, String>>) childMap.get("children");
                    for (Map<String, String> map : list) {
                        String fileName = map.get("name");
                        if(StringUtils.isNotBlank(fileName)){
                            String SignedUrl = attachmentId + "/" + childName + "/" + fileName;
                            String signedRes = fileUrlSigned(SignedUrl, timestamp);
                            String path =  DOMAIN+ "/public/offer/download/"+signedRes+"/"+timestamp+"/"+attachmentId+"/"+childName+"/"+fileName;
                            map.put("path", path);
                        }
                    }
                }
            }
        }
    }




    // Validate the URL by checking its timestamp and signature
    public static boolean isUrlValid222(String url, long originalTimestamp) {
        try {
            // Extract the timestamp and signature from the URL
            URI uri = URI.create(url);
            String query = uri.getQuery();
            String[] params = query.split("&");
            long timestamp = 0;
            String signature = null;

            // Parse timestamp and signature
            for (String param : params) {
                if (param.startsWith("timestamp=")) {
                    timestamp = Long.parseLong(param.split("=")[1]);
                } else if (param.startsWith("signature=")) {
                    signature = param.split("=")[1];
                }
            }

            // Check if the link is expired (10 minutes expiry)
            if (System.currentTimeMillis() - timestamp > EXPIRY_TIME) {
                return false;
            }
            // Verify the signature
            String originalUrl = url.split("&signature=")[0];
            String expectedSignature = generateSignature(originalUrl);
            return expectedSignature.equals(signature);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }


    // Validate the URL by checking its timestamp and signature
    public static boolean isUrlValid(String originalUrl, String signature, Long originalTimestamp) {
        try {
            originalUrl += TIME_KEY + originalTimestamp;
            // Check if the link is expired (10 minutes expiry)
            if (System.currentTimeMillis() - originalTimestamp > EXPIRY_TIME) {
                return false;
            }
            String expectedSignature = generateSignature(originalUrl);
            return expectedSignature.equals(signature);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }


    // Convert byte array to Hex
    private static String bytesToHex(byte[] bytes) {
        StringBuilder sb = new StringBuilder();
        for (byte b : bytes) {
            sb.append(String.format("%02x", b));
        }
        return sb.toString();
    }

    // Generate a hash-based signature for the URL
    private static String generateSignature(String data) throws Exception {
        MessageDigest digest = MessageDigest.getInstance("SHA-256");
        byte[] hash = digest.digest((data + SECRET_KEY).getBytes("UTF-8"));
        return bytesToHex(hash);
    }


    // Generate the signed URL
    public static String fileUrlSigned(String baseUrl, String timestamp) throws Exception {
        String urlWithTimestamp = baseUrl + TIME_KEY + timestamp;
        return generateSignature(urlWithTimestamp);
    }


}