export function derivePatchSeed(worldSeed, terrainType, variant) {
  let hash = (worldSeed >>> 0) ^ 0x9e3779b9;
  hash = Math.imul(hash ^ (variant >>> 0), 668265263) >>> 0;
  for (const char of String(terrainType || "auto")) hash = Math.imul(hash ^ char.charCodeAt(0), 16777619) >>> 0;
  return hash >>> 0;
}

export function buildMaximumProductionLasso(world, width = 470, height = 333) {
  const x0 = Math.max(0, Math.min(world.width - width, world.originX + 238));
  const y0 = Math.max(0, Math.min(world.height - height, world.originY));
  const rect = { x0, y0, x1: x0 + width, y1: y0 + height, kind: "lasso" };
  const insetX = Math.max(4, Math.floor(width * 0.16));
  const insetY = Math.max(4, Math.floor(height * 0.16));
  rect.polygon = [
    { x: rect.x0 + insetX, y: rect.y0 },
    { x: rect.x1 - 1, y: rect.y0 + insetY },
    { x: rect.x1 - insetX, y: rect.y1 - 1 },
    { x: rect.x0, y: rect.y1 - insetY },
  ];
  return rect;
}