var Camera = require('webcamera');
var fs = require('fs');

/**
 * web camera by Node.js and Phantomjs
 * @param {Object} options
 *   - path          {String}   default picture dir path
 *   - workerNum     {Number}   child_process max num
 *   - timeout       {Number}   child_process timeout.
 *   - phantom       {String}   phantomjs path
 *   - phantomScript {String}   phantomjs script path, use input arguments as default script
 *   - qnClient      {Object}   qiniu client instance
 *   - qnOpts        {Object}   qiniu options. if do not have qnClient and qnOpts, shotQN become invalid
 */
var camera = Camera.create({
  qnOpts: {
    accessKey: 'accessKey',
    secretKey: 'secretKey',
    bucket: 'webcamera'
  }
});

// 当处理速度比调用速度低时会触发此事件
camera.on('overload', function (listLength) {
  //listLength为排队等待处理的长度
});

// 截图保存到本地
camera.shot('http://www.baidu.com', './baidu.png', function (err, data) {
  // data.should.equal('./baidu.png');
});

// 截图作为stream
camera.shotStream('http://www.baidu.com', function (err, s) {
  var datas = [];
  var filePath = './test.jpg';
  var file = fs.createWriteStream(filePath, {encoding: 'binary'});
  s.on('data', function (data) {
    file.write(data.toString('binary'), 'binary');
  });
  s.on('end', function () {
    console.log('get pictrue ok');
  });
});

//截图上传到七牛空间，第二个参数为上传七牛的options，第三个参数是截图的options
camera.shotQN('http://www.baidu.com', {key: 'test/baidu.png'}, {quality: 10}, function (err, data) {
  /*
  data.should.like:
  ({
    hash: 'FlDGti9pVGQ3sw2oao-mVu3nZWjZ',
    key: 'test/baidu.png',
    url: 'http://webcamera.u.qiniudn.com/test/baidu.png'
  })
  */
});

camera.shotQN('http://www.baidu.com',320, 'baidu.png', {
  clipRect: {
    top: 0,
    left:0,
    height: 'all',
    width: 'all'
  }
}, function (err, data) {
  /*
  data.should.like:
  {name: 'L1/1/320/baidu.png', size: 36889, url: 'xxx/L1/1/320/baidu.png'}
  */
});