console.log("hello from emblemscanner worker");

let qrtool = require('../qrtool.wx.js');

// Create offscreen canvas for image generation (self-contained)
let offscreenCanvas = null;

function getOffscreenCanvas() {
  if (!offscreenCanvas) {
    offscreenCanvas = wx.createOffscreenCanvas({
      type: '2d',
      width: 100,
      height: 100,
    });
  }
  return offscreenCanvas;
}

/**
 * Convert raw frame data to data URL for image visualization
 */
function data_url_from_frame(width, height, image_data) {
  const canvas = getOffscreenCanvas();
  canvas.width = width;
  canvas.height = height;
  var ctx = canvas.getContext('2d');
  var imgd = ctx.createImageData(width, height);
  imgd.data.set(image_data);
  ctx.putImageData(imgd, 0, 0);
  return canvas.toDataURL("image/jpeg", 1.0);
}

var qrtool_ready = false;

qrtool.onRuntimeInitialized = () => {
  console.log("emblemscanner qrtool ready");
  qrtool_ready = true;
  worker.postMessage({
    type: "ready",
  });
}

var submit_message = null;

function handle_frame(data, width, height, camera_sensitivity) {
  if (!qrtool_ready) {
    console.log("qrtool not ready");
    worker.postMessage({
      type: "result",
      res: {
        ok: false,
        err: "qrtool not ready",
      },
      processing_time: 0,
    });
    return;
  }
  const begin = Date.now();
  var uca = new Uint8ClampedArray(data);
  var buf = qrtool._malloc(uca.length * uca.BYTES_PER_ELEMENT);
  qrtool.HEAPU8.set(uca, buf);
  var r = qrtool.ccall('qrtool_angle', 'string', ['number', 'number', 'number', 'number', 'number'], [buf, width, height, 0, camera_sensitivity]);
  qrtool._free(buf);
  console.log("emblemscanner worker r:", r);
  var res = JSON.parse(r);
  worker.postMessage({
    type: "result",
    res,
    processing_time: Date.now() - begin,
  });
  if (res.ok) {
    // Since image_data takes seconds to serialize, send it in a separate
    // message to the UI can update with the good news
    const dataUrl = data_url_from_frame(width, height, uca);
    submit_message = {
      type: "submit",
      res,
      image_data: { data: dataUrl, width, height },
    };
  }
}

worker.onMessage((msg) => {
  console.log("emblemscanner worker got message", msg.type);
  switch (msg.type) {
    case "frame":
      try {
        // Use frame data from message instead of getCameraFrameData()
        if (msg.data) {
          handle_frame(msg.data, msg.width, msg.height, msg.camera_sensitivity);
        }
      } catch (e) {
        console.log(e);
      }
    break;
    case "ready_to_submit":
      worker.postMessage(submit_message);
    break;
    default:
      console.log("Unknown message type:", msg.type);
  }
});