const smm = require("cemu-smm");
const fs  = require("fs");
  
(async () => {
    
  /**
   * save manipulation
   */
  let save = await smm.loadSave("path/to/your/cemu/save/mlc01/emulatorSave/updateID");
  
  // reorder our course folders to match actual ingame appearance
  await save.reorder();
  
  // recalculate crc checksum and write to 'save.dat'
  // this always has to be done when changing bytes, e.g. in a Hex Editor
  // internally done by reorder(), so unnecessary right here
  await save.writeCrc();
  
  // import all JPEG files and create TNL files in their respective course folder
  await save.importThumbnail();
  
  // extract all TNL files to JPEG in their respective course folder
  await save.exportThumbnail();
  
  
  
  /**
   * course manipulation
   */
  let courses = await save.loadCourses();
  let course = courses.course000;
  await course.setTitle("New Awesome Title");
  await course.setMaker("New Awesome Maker");
  await course.setThumbnail("path/to/image");
  // write to fs / save course
  course.writeToSave();
  
  // serialization
  let serialized = await course.serialize();
  // or gzip + serialize
  //let serialized = await course.serializeGzipped();
  // send serialized data to server
  await require("request-promise").post({
    url: "http://url.of.server",
    formData: {
      course: serialized
    }
  });
  
  // deserialization
  let response = await require("request-promise")("http://url.of.server/?query-string-to-receive-course-file");
  let deserialized = await smm.deserialize(response);
  // we could for example add the deserialized course to our save
  await save.addCourse(deserialized);
  
  
  
  /**
   * image manipulation
   */
  let tnl = smm.loadImage("path/to/your/tnl/file");
  let jpeg = await tnl.toJpeg();
  fs.writeFileSync("path/to/newly/created/jpeg", jpeg);
  
  // convert jpeg to tnl
  jpeg = smm.loadImage("path/to/your/jpeg/file");
  
  // default conversion
  tnl = await jpeg.toTnl();
  fs.writeFileSync("path/to/newly/created/tnl", tnl);
    
  // to wide
  tnl = await jpeg.toTnl(true);
  fs.writeFileSync("path/to/newly/created/tnl", tnl);
    
  // to 4:3
  tnl = await jpeg.toTnl(false);
  fs.writeFileSync("path/to/newly/created/tnl", tnl);
  
})();