import * as THREE from "three";

export function calculateGridMetrics(videoWidth, videoHeight, camera, distance, params, fitMargin) {
  const aspect = videoWidth / videoHeight;
  const cols = params.gridCols;
  const rows = Math.round(cols / aspect);
  const vFovRad = THREE.MathUtils.degToRad(camera.fov);
  const visibleHeight = 2 * Math.tan(vFovRad / 2) * distance;
  const visibleWidth = visibleHeight * camera.aspect;

  let baseCellSize = (visibleWidth * fitMargin) / cols;
  if (baseCellSize * rows > visibleHeight * fitMargin) {
    baseCellSize = (visibleHeight * fitMargin) / rows;
  }

  const spacing = baseCellSize * params.gridSpacing;

  return {
    cols,
    rows,
    count: cols * rows,
    cellSize: baseCellSize,
    spacing: spacing,
    width: cols * spacing,
    height: rows * spacing,
  };
}