import { useCombatStore } from "./combatStore";
import { releaseDungeonGltfCache } from "./dungeonAssetCache";
import { clearDungeonRuntimeCaches } from "./dungeonRuntimeReset";
import { clearMobRuntimeRegistry } from "./mobRuntimeRegistry";
import { clearPartyRuntimeRegistry } from "./partyRuntimeRegistry";
import { resetPartyRuntimeClock } from "./partyRuntime";
import { usePartyStore } from "./partyStore";
import { useGameStore, type BossTestSession, type GameMode } from "./store";
import { bossTestingSourceDungeonId, dungeonCanEnter, dungeonDefinitionById, type DungeonId } from "./dungeonRegistry";
import type { WorldSpawn } from "./dungeonTypes";
import type { GmReviewTarget } from "./gmContentReview";
import { shelvedDungeonSpawn } from "@shelvedDungeonSession";
import {
  activateDungeonEncounterDefinitions,
  exportDungeonEncounterSnapshots,
  importDungeonEncounterSnapshots,
  resetDungeonEncounters,
} from "./dungeonEncounterRuntime";
import type { DungeonEncounterSnapshot } from "./dungeonEncounterTypes";
import { dungeonContentIsUsable } from "../content/contentManager";
import { useDungeonRunStore } from "./dungeonRunStore";
import type { DungeonRunProgress } from "./dungeonRunTypes";
import { validBossDifficulty } from "./dungeonDifficulty";
import { resetDungeonRouteRuntime } from "./dungeonRouteRuntime";
import { useDungeonSimulationStore } from "./dungeonSimulationStore";
import { dungeonRouteDefinition } from "./dungeonRoutes";

export interface DungeonSessionOptions {
  readonly bossDifficulty?: number;
  readonly gameMode?: GameMode;
  readonly spawn?: WorldSpawn;
  readonly gmTestMode?: boolean;
  readonly dungeonSimulation?: boolean;
  readonly bossTest?: BossTestSession | null;
  readonly gmReviewTarget?: GmReviewTarget | null;
  /** Used by in-game encounter transitions so character progression and inventory survive. */
  readonly preserveCharacter?: boolean;
  /** Hydrates save-safe state after definitions have been activated and reset. */
  readonly encounterSnapshots?: readonly DungeonEncounterSnapshot[];
  readonly runProgress?: DungeonRunProgress;
  readonly legacyResume?: boolean;
}

/**
 * The single dungeon-switch boundary. It deliberately clears renderer-facing
 * registries before publishing the new active id, preventing stale positions,
 * targets, routes, or prepared animation templates from crossing instances.
 */
export function activateDungeonSession(
  dungeonId: string,
  difficultyId?: string,
  options: DungeonSessionOptions = {},
): boolean {
  const definition = dungeonDefinitionById(dungeonId);
  const testingSource = bossTestingSourceDungeonId(dungeonId);
  const testing = Boolean(testingSource && options.gmTestMode && options.bossTest?.sourceDungeonId === testingSource);
  const dungeonSimulation = Boolean(options.dungeonSimulation && options.gmTestMode && dungeonRouteDefinition(dungeonId));
  if (!definition || (!testing && !dungeonSimulation && !dungeonCanEnter(dungeonId))
    || !dungeonContentIsUsable(testing ? testingSource! : dungeonId)) {
    return false;
  }
  if ((difficultyId !== undefined && !definition.difficultyVariants.some((variant) => variant.id === difficultyId))
    || (options.bossDifficulty !== undefined && !validBossDifficulty(options.bossDifficulty))) return false;

  const previousDefinition = dungeonDefinitionById(useGameStore.getState().activeDungeonId);
  const bossDifficulty = options.bossDifficulty ?? options.runProgress?.bossDifficulty ?? 1;
  if (previousDefinition) releaseDungeonGltfCache(previousDefinition);
  if (!options.preserveCharacter) {
    useDungeonRunStore.getState().begin(dungeonId, difficultyId ?? definition.defaultDifficultyId,
      options.runProgress, options.legacyResume, bossDifficulty);
  }
  activateDungeonEncounterDefinitions(
    dungeonId,
    definition.encounters ?? [],
    difficultyId ?? definition.defaultDifficultyId,
  );
  resetDungeonEncounters("dungeon", dungeonId);
  clearMobRuntimeRegistry();
  clearPartyRuntimeRegistry();
  resetDungeonRouteRuntime();
  useDungeonSimulationStore.getState().leave();
  clearDungeonRuntimeCaches();
  resetPartyRuntimeClock();
  if (options.preserveCharacter) {
    useCombatStore.getState().resetEncounter();
    const combat = useCombatStore.getState();
    useCombatStore.setState({
      mobs: {},
      selectedTargetId: null,
      activeCast: null,
      effects: [],
      comboPoints: 0,
      feedback: null,
    });
    usePartyStore.getState().resetCombat(combat.level, combat.maxHealth);
  } else {
    useCombatStore.setState({
      mobs: {},
      selectedTargetId: null,
      activeCast: null,
      effects: [],
      comboPoints: 0,
      feedback: null,
    });
    usePartyStore.setState({
      seed: null,
      spectatorParty: false,
      members: [],
      command: "defend",
      selectedMemberId: null,
      selfSelected: false,
      routeBlocked: false,
      activeMobId: null,
      objectiveBossId: null,
      memberTargetIds: {},
    });
  }
  useGameStore.getState().activateDungeon(dungeonId as DungeonId, difficultyId, {
    gameMode: options.gameMode,
    spawn: shelvedDungeonSpawn(dungeonId, options.spawn),
    gmTestMode: options.gmTestMode,
    bossTest: options.bossTest,
    gmReviewTarget: options.gmReviewTarget,
    bossDifficulty,
  });
  if (options.encounterSnapshots?.length) {
    importDungeonEncounterSnapshots(dungeonId, options.encounterSnapshots, { authoritative: true });
  }
  useCombatStore.getState().setPlayerPosition(useGameStore.getState().playerPosition);
  return true;
}

/**
 * Rebuilds the current encounter after an asset/render failure without
 * discarding the selected character, party composition, or run progression.
 */
export function restartActiveDungeonSession(): boolean {
  const game = useGameStore.getState();
  const encounterSnapshots = exportDungeonEncounterSnapshots(game.activeDungeonId);
  return activateDungeonSession(game.activeDungeonId, game.activeDifficultyId, {
    gameMode: game.gameMode,
    spawn: game.activeSpawn,
    gmTestMode: game.gmTestMode,
    bossTest: game.bossTest,
    gmReviewTarget: game.activeGmReviewTarget,
    preserveCharacter: true,
    bossDifficulty: game.activeBossDifficulty,
    encounterSnapshots,
  });
}