import type { GameMode } from "./store";
import type { DungeonBossObjective, DungeonDefinition } from "./dungeonTypes";
import type { ManastormStageAssetPackage } from "./manastormStageAssets";

/**
 * Party navigation graphs are currently built synchronously on the main thread.
 * Benchmarks put 50k triangles at roughly half a second on the development
 * machine. Larger graphs use breadcrumb following until graph construction can
 * move off the main thread.
 */
export const MAX_SYNCHRONOUS_PARTY_NAVIGATION_TRIANGLES = 50_000;
const NO_ROUTED_PARTY_OBJECTIVES = Object.freeze([]) as readonly DungeonBossObjective[];

export function shouldLoadPartyNavigation(
  gameMode: GameMode,
  dungeon: Pick<DungeonDefinition, "assets" | "validation">,
  manastormPackage: Pick<ManastormStageAssetPackage, "navigation"> | null,
): boolean {
  const navigation = gameMode === "manastorm" && manastormPackage
    ? manastormPackage.navigation
    : dungeon.assets.navigation;
  if (!navigation) return false;

  // Navigation can be reviewed independently from encounter/checkpoint content.
  // Do not make safe melee routing wait for unrelated dungeon validation work.
  if (
    gameMode === "dungeon"
    && dungeon.validation.status !== "green"
    && dungeon.validation.navigation !== "green"
  ) return false;

  const triangleCount = navigation.triangleCount;
  return typeof triangleCount === "number"
    && Number.isInteger(triangleCount)
    && triangleCount > 0
    && triangleCount <= MAX_SYNCHRONOUS_PARTY_NAVIGATION_TRIANGLES;
}

/** Follow the player's safe breadcrumb trail until a usable graph is ready. */
export function partyObjectivesForNavigation(
  navigationReady: boolean,
  objectives: readonly DungeonBossObjective[],
): readonly DungeonBossObjective[] {
  return navigationReady ? objectives : NO_ROUTED_PARTY_OBJECTIVES;
}