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/**
 * @module ol/geom/flat/inflate
 */

/**
 * @param {Array} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {Array} [coordinates] Coordinates.
 * @return {Array} Coordinates.
 */
export function inflateCoordinates(
  flatCoordinates,
  offset,
  end,
  stride,
  coordinates,
) {
  coordinates = coordinates !== undefined ? coordinates : [];
  let i = 0;
  for (let j = offset; j < end; j += stride) {
    coordinates[i++] = flatCoordinates.slice(j, j + stride);
  }
  coordinates.length = i;
  return coordinates;
}

/**
 * @param {Array} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array} ends Ends.
 * @param {number} stride Stride.
 * @param {Array>} [coordinatess] Coordinatess.
 * @return {Array>} Coordinatess.
 */
export function inflateCoordinatesArray(
  flatCoordinates,
  offset,
  ends,
  stride,
  coordinatess,
) {
  coordinatess = coordinatess !== undefined ? coordinatess : [];
  let i = 0;
  for (let j = 0, jj = ends.length; j < jj; ++j) {
    const end = ends[j];
    coordinatess[i++] = inflateCoordinates(
      flatCoordinates,
      offset,
      end,
      stride,
      coordinatess[i],
    );
    offset = end;
  }
  coordinatess.length = i;
  return coordinatess;
}

/**
 * @param {Array} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array>} endss Endss.
 * @param {number} stride Stride.
 * @param {Array>>} [coordinatesss]
 *     Coordinatesss.
 * @return {Array>>} Coordinatesss.
 */
export function inflateMultiCoordinatesArray(
  flatCoordinates,
  offset,
  endss,
  stride,
  coordinatesss,
) {
  coordinatesss = coordinatesss !== undefined ? coordinatesss : [];
  let i = 0;
  for (let j = 0, jj = endss.length; j < jj; ++j) {
    const ends = endss[j];
    coordinatesss[i++] =
      ends.length === 1 && ends[0] === offset
        ? []
        : inflateCoordinatesArray(
            flatCoordinates,
            offset,
            ends,
            stride,
            coordinatesss[i],
          );
    offset = ends[ends.length - 1];
  }
  coordinatesss.length = i;
  return coordinatesss;
}