import { Image as RNImage } from "react-native";
import { isNil } from "ramda";

type Size = {
  width: number;
  height: number;
};

export const UNKNOWN_ASPECT_RATIO = undefined;

export const UNKNOWN_DIMENSION = undefined;

export const getImageSize = (
  uri: string,
  width: number,
  height: Nullable<number>
): Promise<Size> => {
  if (!isNil(width) && !isNil(height)) {
    const size: Size = { width, height };

    return Promise.resolve(size);
  }

  return new Promise((resolve, reject) => {
    RNImage.getSize(
      uri,
      (width: number, height: number) => {
        const size: Size = { width, height };
        resolve(size);
      },
      reject
    );
  });
};

export const getAspectRatio = ({ width, height }) => {
  if (!isNil(width) && !isNil(height)) {
    return width / height;
  }

  return UNKNOWN_ASPECT_RATIO;
};

export const getDimension = ({ width, height }) => {
  if (!isNil(width) && !isNil(height)) {
    return {
      aspectRatio: getAspectRatio({ width, height }),
      width,
      height,
    };
  }

  return UNKNOWN_DIMENSION;
};