const sharp = require("sharp");
const fs = require("fs");


/*
  RADIO COVER
*/
const radio_cover_sizes = [
  { width: 128, height: 128, fit: "cover" },
  { width: 64, height: 64, fit: "cover" },
  { width: 32, height: 32, fit: "cover" }
];
exports.resize_image_for_radio = function (image, callback) {
  resizer(image, radio_cover_sizes, callback);
};

/*
  ALBUM COVER
*/
const album_cover_sizes = [
  { width: 256, height: 256, fit: "cover" },
  { width: 128, height: 128, fit: "cover" },
  { width: 64, height: 64, fit: "cover" },
  { width: 32, height: 32, fit: "cover" }
];
exports.resize_image_for_album = function (image, callback) {
  if (typeof image === 'string') {
    let data = fs.readFileSync(image);
    resizer(data, album_cover_sizes, callback);
  } else {
    resizer(image, album_cover_sizes, callback);
  }
};

/*
  ARTIST COVER
*/
const artist_cover_sizes = [
  { width: 1024, height: 512, fit: "cover" },
  { width: 512, height: 256, fit: "cover" },
  { width: 256, height: 128, fit: "cover" },
  { width: 128, height: 64, fit: "cover" },
  { width: 64, height: 32, fit: "cover" }
];
exports.resize_image_for_artist = function (image, callback) {
  if (typeof image === 'string') {
    console.log("resizing: " + image);
    let data = fs.readFileSync(image);
    resizer(data, artist_cover_sizes, callback);
  } else {
    resizer(image, artist_cover_sizes, callback);
  }
};

/*
  BOX COVER
*/
const box_cover_sizes = [
  { width: 256, height: 362, fit: "cover" },
  { width: 128, height: 181, fit: "cover" },
  { width: 64, height: 90, fit: "cover" },
  { width: 32, height: 45, fit: "cover" }
];
exports.resize_image_for_box = function (image, callback) {
  if (typeof image === 'string') {
    let data = fs.readFileSync(image);
    resizer(data, box_cover_sizes, callback);
  } else {
    resizer(image, box_cover_sizes, callback);
  }
};


function resizer(image, array, callback) {
  let result = {}
  let runner = (image, index) => {
    if (index < array.length) {
      let size = array[index];
      sharp(image)
        .resize(size)
        .png()
        .toBuffer()
        .then(data => {
          result["cover" + size.width] = "data:image/png;base64, " + Buffer.from(data).toString("base64");
          runner(data, ++index);
        }).catch(err=>{
          console.log(err);
        });
    } else {
      if (callback) {
        callback(result);
      }
    }
  }
  runner(image, 0);
}