/**
 * @module ol/geom/flat/deflate
 */


/**
 * @param {Array<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {import("../../coordinate.js").Coordinate} coordinate Coordinate.
 * @param {number} stride Stride.
 * @return {number} offset Offset.
 */
export function deflateCoordinate(flatCoordinates, offset, coordinate, stride) {
  for (let i = 0, ii = coordinate.length; i < ii; ++i) {
    flatCoordinates[offset++] = coordinate[i];
  }
  return offset;
}


/**
 * @param {Array<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array<import("../../coordinate.js").Coordinate>} coordinates Coordinates.
 * @param {number} stride Stride.
 * @return {number} offset Offset.
 */
export function deflateCoordinates(flatCoordinates, offset, coordinates, stride) {
  for (let i = 0, ii = coordinates.length; i < ii; ++i) {
    const coordinate = coordinates[i];
    for (let j = 0; j < stride; ++j) {
      flatCoordinates[offset++] = coordinate[j];
    }
  }
  return offset;
}


/**
 * @param {Array<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array<Array<import("../../coordinate.js").Coordinate>>} coordinatess Coordinatess.
 * @param {number} stride Stride.
 * @param {Array<number>=} opt_ends Ends.
 * @return {Array<number>} Ends.
 */
export function deflateCoordinatesArray(flatCoordinates, offset, coordinatess, stride, opt_ends) {
  const ends = opt_ends ? opt_ends : [];
  let i = 0;
  for (let j = 0, jj = coordinatess.length; j < jj; ++j) {
    const end = deflateCoordinates(
      flatCoordinates, offset, coordinatess[j], stride);
    ends[i++] = end;
    offset = end;
  }
  ends.length = i;
  return ends;
}


/**
 * @param {Array<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array<Array<Array<import("../../coordinate.js").Coordinate>>>} coordinatesss Coordinatesss.
 * @param {number} stride Stride.
 * @param {Array<Array<number>>=} opt_endss Endss.
 * @return {Array<Array<number>>} Endss.
 */
export function deflateMultiCoordinatesArray(flatCoordinates, offset, coordinatesss, stride, opt_endss) {
  const endss = opt_endss ? opt_endss : [];
  let i = 0;
  for (let j = 0, jj = coordinatesss.length; j < jj; ++j) {
    const ends = deflateCoordinatesArray(
      flatCoordinates, offset, coordinatesss[j], stride, endss[i]);
    endss[i++] = ends;
    offset = ends[ends.length - 1];
  }
  endss.length = i;
  return endss;
}