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package me.chanjar.weixin.util.http;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.lang3.StringUtils;
import org.apache.http.Header;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.entity.ContentType;

import me.chanjar.weixin.bean.result.WxError;
import me.chanjar.weixin.exception.WxErrorException;
import me.chanjar.weixin.util.fs.FileUtils;

/**
 * 下载媒体文件请求执行器，请求的参数是String, 返回的结果是File
 * @author chanjarster
 *
 */
public class MediaDownloadRequestExecutor implements RequestExecutor {

  @Override
  public File execute(String uri, String queryParam) throws WxErrorException, ClientProtocolException, IOException {
    if (queryParam != null) {
      if (uri.indexOf('?') == -1) {
        uri += '?';
      }
      uri += uri.endsWith("?") ? queryParam : '&' + queryParam;
    }
    
    HttpGet httpGet = new HttpGet(uri);
    CloseableHttpResponse response = httpclient.execute(httpGet);

    Header[] contentTypeHeader = response.getHeaders("Content-Type");
    if (contentTypeHeader != null && contentTypeHeader.length > 0) {
      // 下载媒体文件出错
      if (ContentType.TEXT_PLAIN.getMimeType().equals(contentTypeHeader[0].getValue())) {
        String responseContent = Utf8ResponseHandler.INSTANCE.handleResponse(response);
        throw new WxErrorException(WxError.fromJson(responseContent));
      }
    }
    InputStream inputStream = InputStreamResponseHandler.INSTANCE.handleResponse(response);
    
    // 视频文件不支持下载
    String fileName = getFileName(response);
    if (StringUtils.isBlank(fileName)) {
      return null;
    }
    String[] name_ext = fileName.split("\\.");
    File localFile = FileUtils.createTmpFile(inputStream, name_ext[0], name_ext[1]);
    return localFile;
  }

  protected String getFileName(CloseableHttpResponse response) {
    Header[] contentDispositionHeader = response.getHeaders("Content-disposition");
    Pattern p = Pattern.compile(".*filename=\"(.*)\"");
    Matcher m = p.matcher(contentDispositionHeader[0].getValue());
    m.matches();
    String fileName = m.group(1);
    return fileName;
  }
  
}