import { useRapier } from "@react-three/rapier";
import { useEffect, useMemo } from "react";
import { combatNavigationGraph } from "../game/combatSpatial";
import { createMobPursuit } from "../game/mobPursuit";
import { registerDungeonRuntimeReset } from "../game/dungeonRuntimeReset";
import { hasDungeonLineOfSight } from "./dungeonLineOfSight";
import { createPartyDirectSegmentValidator, createPartyRecoveryPointValidator, createPartyRouteSegmentValidator } from "./partyTraversal";

/** Uses terrain only; actors remain non-blocking and the graph is loaded only once. */
export function useMobNavigation() {
  const { rapier, world } = useRapier();
  const navigator = useMemo(() => {
    let graph = combatNavigationGraph();
    let landing = createPartyRecoveryPointValidator(rapier, world, graph);
    return createMobPursuit({
      graph: combatNavigationGraph,
      hasLineOfSight: (from, to) => hasDungeonLineOfSight(rapier, world, from, to),
      directAllowed: createPartyDirectSegmentValidator(rapier, world),
      routeAllowed: createPartyRouteSegmentValidator(rapier, world),
      validateLanding: (point, anchor) => {
        const currentGraph = combatNavigationGraph();
        if (graph !== currentGraph) {
          graph = currentGraph;
          landing = createPartyRecoveryPointValidator(rapier, world, graph);
        }
        return landing(point, anchor);
      },
    });
  }, [rapier, world]);
  useEffect(() => registerDungeonRuntimeReset(navigator.clear), [navigator]);
  return navigator;
}