import type { DungeonDefinition } from "../game/dungeonTypes";

export function dungeonRenderDistance(dungeon: DungeonDefinition): number {
  const boundsDistance = Math.max(950, Math.min(10_000, Math.hypot(
    dungeon.bounds.max[0] - dungeon.bounds.min[0],
    dungeon.bounds.max[2] - dungeon.bounds.min[2],
  ) * 1.35));
  const fogFar = dungeon.presentation.fog.far;
  // Linear fog has completely obscured surfaces at this camera-space depth.
  // The background must use the fog color so clipping cannot reveal a horizon.
  return Number.isFinite(fogFar) && fogFar > 1
    ? Math.min(boundsDistance, fogFar)
    : boundsDistance;
}