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package cn.net.wanmo.common.http.util;

import cn.net.wanmo.common.charset.CharsetUtil;
import cn.net.wanmo.common.util.IdGen;
import cn.net.wanmo.common.util.StringUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.util.Scanner;

public class ResUtil {
    private static Logger logger = LoggerFactory.getLogger(ResUtil.class);

    /**
     * 获取响应的编码格式 

     * 从请求头 header.put("Content-Type", "application/json; charset=UTF-8"); 获取 charset
     *
     * @param contentType 响应内容编码
     * @return 编码格式， 默认 UTF-8
     */
    public static String getResponseCharset(String contentType) {
        logger.debug("从请求头中解析请求数据使用的编码： {}", contentType);

        String charsetName = null;

        if (StringUtil.isBlank(contentType)) {
            charsetName = CharsetUtil.UTF8_NAME;
            return charsetName;
        }

        String[] params = contentType.split(";");
        for (String param : params) {
            param = param.trim();
            if (param.startsWith("charset")) {

                String[] pair = param.split("=", 2);
                if (pair.length == 2) {
                    if (StringUtil.isNotEmpty(pair[1])) {
                        charsetName = pair[1].trim();
                    }
                }
                break;
            }
        }

        return StringUtil.isBlank(charsetName) ? CharsetUtil.UTF8_NAME : charsetName;
    }

    /**
     * 从流中获取响应字符串
     *
     * @param stream      流数据
     * @param charsetName 字符集
     * @return 响应
     * @throws IOException
     */
    public static String getResAsString(InputStream stream, String charsetName) throws IOException {
        return getResAsString_1(stream, charsetName);
    }

    /**
     * 从流中获取响应字符串
     *
     * @param stream      流数据
     * @param charsetName 字符集
     * @return 响应
     * @throws IOException
     */
    private static String getResAsString_1(InputStream stream, String charsetName) throws IOException {
        Scanner scanner = new Scanner(stream, charsetName);

        StringBuffer buffer = new StringBuffer();
        while (scanner.hasNextLine()) {
            buffer.append(scanner.nextLine());
        }

        return buffer.toString();
    }


    /**
     * 从流中获取响应字符串
     *
     * @param stream      流数据
     * @param charsetName 字符集
     * @return 响应
     * @throws IOException
     */
    private static String getResAsString_2(InputStream stream, String charsetName) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(stream, charsetName));

        StringBuffer buffer = new StringBuffer();
        String str = null;
        while ((str = bufferedReader.readLine()) != null) {
            buffer.append(str);
        }

        return buffer.toString();
    }


    /**
     * 从流中获取响应字符串
     *
     * @param stream  流数据
     * @param charset 字符集
     * @return 响应
     * @throws IOException
     */
    private static String getResAsString_3(InputStream stream, String charset) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(stream, charset));

        StringWriter writer = new StringWriter();
        char[] chars = new char[1024];
        int count = 0;
        while ((count = reader.read(chars)) > 0) {
            writer.write(chars, 0, count);
        }

        return writer.toString();
    }

    /**
     * 从流中获取响应文件
     *
     * @param stream 流数据
     * @return 响应
     * @throws IOException
     */
    public static File getResAsFile(InputStream stream) throws IOException {
        return getResAsFile_1(stream);
    }

    /**
     * 从流中获取响应文件
     *
     * @param stream 流数据
     * @return 响应
     * @throws IOException
     */
    private static File getResAsFile_1(InputStream stream) throws IOException {
        File file = File.createTempFile(IdGen.uuid(), "tmp");

        BufferedInputStream bis = new BufferedInputStream(stream);
        OutputStream os = new FileOutputStream(file);
        int len;
        byte[] arr = new byte[1024];
        while ((len = bis.read(arr)) != -1) {
            os.write(arr, 0, len);
            os.flush();
        }

        os.close();
        bis.close();

        return file;
    }
}