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package com.clickntap.platform;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.io.FileUtils;
import org.json.JSONObject;

public class UploadInputStream extends InputStream {

  private JSONObject info;
  private long fileSize;
  private long fileIndex;
  private int chunkIndex;
  private int chunkN;
  private byte[] bytes;

  public UploadInputStream(JSONObject info) throws Exception {
    this.info = info;
    this.fileSize = info.getLong("fileSize");
    this.fileIndex = 0;
    this.chunkIndex = 0;
    this.chunkN = 0;
    File file = UploadFile.tmpFile(info, this.chunkN++);
    this.bytes = FileUtils.readFileToByteArray(file);
    file.delete();
  }

  public int read() throws IOException {
    if (this.fileIndex < fileSize) {
      int chunkIndex = this.chunkIndex;
      if (chunkIndex >= this.bytes.length) {
        try {
          File file = UploadFile.tmpFile(info, this.chunkN++);
          int seconds = 10;
          while (!file.exists()) {
            if (seconds == 0) {
              throw new Exception("chunk " + this.chunkN + " not found - " + info.toString());
            }
            Thread.sleep(1000);
            seconds--;
          }
          this.bytes = FileUtils.readFileToByteArray(file);
          file.delete();
          chunkIndex = this.chunkIndex = 0;
        } catch (Exception e) {
          throw new IOException(e);
        }
      }
      int value = (this.bytes[chunkIndex] & 0xff);
      this.fileIndex++;
      this.chunkIndex++;
      return value;
    }
    return -1;
  }

}