var request = require("request")
const http = require('http');
const fs = require('fs');

var url = "https://api.tumblr.com/v2/blog/velmacosluv/posts/photo?api_key=gzapg9n2HFlDO3spGfh7GBA8InBO3sOuNxeLe6yjpRSPV0qDti&offset="

var download = function(url, dest) {
  var file = fs.createWriteStream(dest);
  var request = http.get(url, function(response) {
    response.pipe(file);
    file.on('finish', function() {
      file.close(() => {});  // close() is async, call cb after close completes.
    }).on('error', function() {
    });
  })
};

function sleep(ms) {
  return new Promise(resolve => setTimeout(resolve, ms));
}

function DO(i) {
    request({
        url: url + i * 20,
        json: true
    }, function (error, response, body) {
        if (!error && response.statusCode === 200) {
            let pht = body.response.posts
            for (let j = 0; j < pht.length; j++) {
                for (let k = 0; k < pht[j].photos.length; k++) {
                    let ph = pht[j].photos[k].original_size.url
                    if (ph[4] == 's') {
                        ph = ph.slice(0, 4) + ph.slice(5)
                    }
                    download(ph, "res/" + i + "_" + j + "_" + k + ".jpg")
                }
            }
        }
    })
    console.log(i)
    if (i < 6)
        setTimeout(DO, 1500, i + 1)
}

DO(0)