package com.ozs.common.utils.file;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.net.UnknownHostException;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.LinkedList;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.alibaba.fastjson2.JSON;
import com.ozs.common.utils.EsUtil;
import com.ozs.common.utils.StringUtils;
import com.ozs.common.vo.EsMessage;
import com.ozs.common.vo.FileMessage;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.ArrayUtils;
import com.ozs.common.config.PurchaseConfig;
import com.ozs.common.utils.DateUtils;
import com.ozs.common.utils.uuid.IdUtils;
import org.apache.commons.io.FilenameUtils;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.builder.SearchSourceBuilder;

/**
 * 文件处理工具类
 *
 * @author ruoyi
 */
@Slf4j
public class FileUtils {

    public static String FILENAME_PATTERN = "[a-zA-Z0-9_\\-\\|\\.\\u4e00-\\u9fa5]+";

    /**
     * 输出指定文件的byte数组
     *
     * @param filePath 文件路径
     * @param os       输出流
     * @return
     */
    public static void writeBytes(String filePath, OutputStream os) throws IOException {
        FileInputStream fis = null;
        try {
            File file = new File(filePath);
            if (!file.exists()) {
                throw new FileNotFoundException(filePath);
            }
            fis = new FileInputStream(file);
            byte[] b = new byte[1024];
            int length;
            while ((length = fis.read(b)) > 0) {
                os.write(b, 0, length);
            }
        } catch (IOException e) {
            throw e;
        } finally {
            IOUtils.close(os);
            IOUtils.close(fis);
        }
    }

    /**
     * 写数据到文件中
     *
     * @param data 数据
     * @return 目标文件
     * @throws IOException IO异常
     */
    public static String writeImportBytes(byte[] data) throws IOException {
        return writeBytes(data, PurchaseConfig.getImportPath());
    }

    /**
     * 写数据到文件中
     *
     * @param data      数据
     * @param uploadDir 目标文件
     * @return 目标文件
     * @throws IOException IO异常
     */
    public static String writeBytes(byte[] data, String uploadDir) throws IOException {
        FileOutputStream fos = null;
        String pathName = "";
        try {
            String extension = getFileExtendName(data);
            pathName = DateUtils.datePath() + "/" + IdUtils.fastUUID() + "." + extension;
            File file = FileUploadUtils.getAbsoluteFile(uploadDir, pathName);
            fos = new FileOutputStream(file);
            fos.write(data);
        } finally {
            IOUtils.close(fos);
        }
        return FileUploadUtils.getPathFileName(uploadDir, pathName);
    }

    /**
     * 删除文件
     *
     * @param filePath 文件
     * @return
     */
    public static boolean deleteFile(String filePath) {
        boolean flag = false;
        File file = new File(filePath);
        // 路径为文件且不为空则进行删除
        if (file.isFile() && file.exists()) {
            flag = file.delete();
        }
        return flag;
    }

    /**
     * 文件名称验证
     *
     * @param filename 文件名称
     * @return true 正常 false 非法
     */
    public static boolean isValidFilename(String filename) {
        return filename.matches(FILENAME_PATTERN);
    }

    /**
     * 检查文件是否可下载
     *
     * @param resource 需要下载的文件
     * @return true 正常 false 非法
     */
    public static boolean checkAllowDownload(String resource) {
        // 禁止目录上跳级别
        if (StringUtils.contains(resource, "..")) {
            return false;
        }

        // 检查允许下载的文件规则
        if (ArrayUtils.contains(MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION, FileTypeUtils.getFileType(resource))) {
            return true;
        }

        // 不在允许下载的文件规则
        return false;
    }

    /**
     * 下载文件名重新编码
     *
     * @param request  请求对象
     * @param fileName 文件名
     * @return 编码后的文件名
     */
    public static String setFileDownloadHeader(HttpServletRequest request, String fileName) throws UnsupportedEncodingException {
        final String agent = request.getHeader("USER-AGENT");
        String filename = fileName;
        if (agent.contains("MSIE")) {
            // IE浏览器
            filename = URLEncoder.encode(filename, "utf-8");
            filename = filename.replace("+", " ");
        } else if (agent.contains("Firefox")) {
            // 火狐浏览器
            filename = new String(fileName.getBytes(), "ISO8859-1");
        } else if (agent.contains("Chrome")) {
            // google浏览器
            filename = URLEncoder.encode(filename, "utf-8");
        } else {
            // 其它浏览器
            filename = URLEncoder.encode(filename, "utf-8");
        }
        return filename;
    }

    /**
     * 下载文件名重新编码
     *
     * @param response     响应对象
     * @param realFileName 真实文件名
     */
    public static void setAttachmentResponseHeader(HttpServletResponse response, String realFileName) throws UnsupportedEncodingException {
        String percentEncodedFileName = percentEncode(realFileName);

        StringBuilder contentDispositionValue = new StringBuilder();
        contentDispositionValue.append("attachment; filename=")
                .append(percentEncodedFileName)
                .append(";")
                .append("filename*=")
                .append("utf-8''")
                .append(percentEncodedFileName);

        response.addHeader("Access-Control-Expose-Headers", "Content-Disposition,download-filename");
        response.setHeader("Content-disposition", contentDispositionValue.toString());
        response.setHeader("download-filename", percentEncodedFileName);
    }

    /**
     * 百分号编码工具方法
     *
     * @param s 需要百分号编码的字符串
     * @return 百分号编码后的字符串
     */
    public static String percentEncode(String s) throws UnsupportedEncodingException {
        String encode = URLEncoder.encode(s, StandardCharsets.UTF_8.toString());
        return encode.replaceAll("\\+", "%20");
    }

    /**
     * 获取图像后缀
     *
     * @param photoByte 图像数据
     * @return 后缀名
     */
    public static String getFileExtendName(byte[] photoByte) {
        String strFileExtendName = "jpg";
        if ((photoByte[0] == 71) && (photoByte[1] == 73) && (photoByte[2] == 70) && (photoByte[3] == 56)
                && ((photoByte[4] == 55) || (photoByte[4] == 57)) && (photoByte[5] == 97)) {
            strFileExtendName = "gif";
        } else if ((photoByte[6] == 74) && (photoByte[7] == 70) && (photoByte[8] == 73) && (photoByte[9] == 70)) {
            strFileExtendName = "jpg";
        } else if ((photoByte[0] == 66) && (photoByte[1] == 77)) {
            strFileExtendName = "bmp";
        } else if ((photoByte[1] == 80) && (photoByte[2] == 78) && (photoByte[3] == 71)) {
            strFileExtendName = "png";
        }
        return strFileExtendName;
    }

    /**
     * 获取文件名称 /profile/upload/2022/04/16/ruoyi.png -- ruoyi.png
     *
     * @param fileName 路径名称
     * @return 没有文件路径的名称
     */
    public static String getName(String fileName) {
        if (fileName == null) {
            return null;
        }
        int lastUnixPos = fileName.lastIndexOf('/');
        int lastWindowsPos = fileName.lastIndexOf('\\');
        int index = Math.max(lastUnixPos, lastWindowsPos);
        return fileName.substring(index + 1);
    }

    /**
     * 获取不带后缀文件名称 /profile/upload/2022/04/16/ruoyi.png -- ruoyi
     *
     * @param fileName 路径名称
     * @return 没有文件路径和后缀的名称
     */
    public static String getNameNotSuffix(String fileName) {
        if (fileName == null) {
            return null;
        }
        String baseName = FilenameUtils.getBaseName(fileName);
        return baseName;
    }


    /**
     * 上传文档到es
     * @param filePath
     * @param id  当前文件入库id
     */
    public static void uploadESFile(String filePath,String id) {
        File file = new File(filePath);
        if (!file.exists()) {
            System.out.println("找不到文件");
        }
        FileMessage fileM = new FileMessage();
        try {
            byte[] bytes = getContent(file);
            String base64 = Base64.getEncoder().encodeToString(bytes);
            fileM.setId(id);
            fileM.setName(file.getName());
            fileM.setContent(base64);
            IndexRequest indexRequest = new IndexRequest("fileindex");
            //上传同时，使用attachment pipline进行提取文件
            indexRequest.source(JSON.toJSONString(fileM), XContentType.JSON);
            indexRequest.setPipeline("attachment");
            IndexResponse indexResponse = EsUtil.esUtil.client.index(indexRequest, RequestOptions.DEFAULT);
            log.info("send to eSearch:" + fileM.getName());
            log.info("send to eSeach results:" + indexResponse);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    /**
     * 文件转base64
     *
     * @param file
     * @return
     * @throws IOException
     */
    public static byte[] getContent(File file) throws IOException {

        long fileSize = file.length();
        if (fileSize > Integer.MAX_VALUE) {
            System.out.println("file too big...");
            return null;
        }
        FileInputStream fi = new FileInputStream(file);
        byte[] buffer = new byte[(int) fileSize];
        int offset = 0;
        int numRead = 0;
        while (offset < buffer.length
                && (numRead = fi.read(buffer, offset, buffer.length - offset)) >= 0) {
            offset += numRead;
        }
        // 确保所有数据均被读取
        if (offset != buffer.length) {
            throw new IOException("Could not completely read file "
                    + file.getName());
        }
        fi.close();
        return buffer;
    }


    public static List<EsMessage> eSearch(String msg) throws UnknownHostException {
//
        List<EsMessage> matchRsult = new LinkedList<EsMessage>();
        SearchSourceBuilder builder = new SearchSourceBuilder();

        //因为我这边实际业务需要其他字段的查询，所以进行查询的字段就比较，如果只是查询文档中内容的话，打开注释的代码，然后注释掉这行代码
        builder.query(QueryBuilders.multiMatchQuery(msg, "attachment.content", "name", "sfName", "createBy").analyzer("ik_smart"));

        //builder.query(QueryBuilders.matchQuery("attachment.content", msg).analyzer("ik_smart"));
        SearchResponse searchResponse = EsUtil.selectDocument("fileindex", builder);
        SearchHits hits = searchResponse.getHits();

        for (SearchHit hit : hits.getHits()) {
            hit.getSourceAsMap().put("msg", "");
            matchRsult.add(JSON.parseObject(JSON.toJSONString(hit.getSourceAsMap()),EsMessage.class));
            // System.out.println(hit.getSourceAsString());
        }
        System.out.println("over in the main");

        return matchRsult;
    }


}