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import { isNodePattern, throwError } from "@jimp/utils";

/**
 * Displaces the image based on the provided displacement map
 * @param {object} map the source Jimp instance
 * @param {number} offset the maximum displacement value
 * @param {function(Error, Jimp)} cb (optional) a callback for when complete
 * @returns {Jimp} this for chaining of methods
 */
export default () => ({
  displace(map, offset, cb) {
    if (typeof map !== "object" || map.constructor !== this.constructor) {
      return throwError.call(this, "The source must be a Jimp image", cb);
    }

    if (typeof offset !== "number") {
      return throwError.call(this, "factor must be a number", cb);
    }

    const source = this.cloneQuiet();
    this.scanQuiet(
      0,
      0,
      this.bitmap.width,
      this.bitmap.height,
      function (x, y, idx) {
        let displacement = (map.bitmap.data[idx] / 256) * offset;
        displacement = Math.round(displacement);

        const ids = this.getPixelIndex(x + displacement, y);
        this.bitmap.data[ids] = source.bitmap.data[idx];
        this.bitmap.data[ids + 1] = source.bitmap.data[idx + 1];
        this.bitmap.data[ids + 2] = source.bitmap.data[idx + 2];
      }
    );

    if (isNodePattern(cb)) {
      cb.call(this, null, this);
    }

    return this;
  },
});