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

/**
 * Masks a source image on to this image using average pixel colour. A completely black pixel on the mask will turn a pixel in the image completely transparent.
 * @param {Jimp} src the source Jimp instance
 * @param {number} x the horizontal position to blit the image
 * @param {number} y the vertical position to blit the image
 * @param {function(Error, Jimp)} cb (optional) a callback for when complete
 * @returns {Jimp} this for chaining of methods
 */
export default () => ({
  mask(src, x = 0, y = 0, cb) {
    if (!(src instanceof this.constructor)) {
      return throwError.call(this, "The source must be a Jimp image", cb);
    }

    if (typeof x !== "number" || typeof y !== "number") {
      return throwError.call(this, "x and y must be numbers", cb);
    }

    // round input
    x = Math.round(x);
    y = Math.round(y);

    const w = this.bitmap.width;
    const h = this.bitmap.height;
    const baseImage = this;

    src.scanQuiet(
      0,
      0,
      src.bitmap.width,
      src.bitmap.height,
      function (sx, sy, idx) {
        const destX = x + sx;
        const destY = y + sy;

        if (destX >= 0 && destY >= 0 && destX < w && destY < h) {
          const dstIdx = baseImage.getPixelIndex(destX, destY);
          const { data } = this.bitmap;
          const avg = (data[idx + 0] + data[idx + 1] + data[idx + 2]) / 3;

          baseImage.bitmap.data[dstIdx + 3] *= avg / 255;
        }
      }
    );

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

    return this;
  },
});