import { BaseScene } from "./scene/BaseScene";
import type { IBaseScene } from "./scene/types";
import { SceneType } from "./enums/SceneType";
import { assetManager } from "./core/AssetManager";
import { logger } from "./core/Logger";
import { Container } from "pixi.js";
import { appRuntime } from "./kernel/AppRuntime";
import type { RuntimePlugin } from "./kernel/RuntimePlugin";

const game = appRuntime.game;
const sceneManager = appRuntime.sceneManager;
const eventBus = appRuntime.events;

const runtimeSceneEventsPlugin: RuntimePlugin = {
  name: "runtime-scene-events",
  setup: ({ game: runtimeGame, sceneManager: runtimeSceneManager, events }) => {
    runtimeGame.setAfterFrameRenderHook(() => {
      // Keep legacy event name, but only emit from frame loop.
      events.emit("game:rendered");
      events.emit("game:frame-rendered");
    });
    runtimeSceneManager.onStageChange((current, previous) => {
      events.emit("scene:changed", {
        current: current.name,
        previous: previous?.name,
      });
    });
  },
};

type Constructor<T> = new (...args: unknown[]) => T;

export async function initApp(): Promise<void> {
  appRuntime.use(runtimeSceneEventsPlugin);
  await assetManager.init();
  await game.init();

  const sceneModules = import.meta.glob("./stages/**/page_*.ts", { eager: true });

  for (const path in sceneModules) {
    try {
      const mod = sceneModules[path];
      const match = path.match(/page_(.*?)\.ts$/);
      if (!match) continue;
      const fileSceneName = match[1];

      const raw = (mod as { default: unknown }).default;
      if (typeof raw !== "function") {
        logger.warn(`initApp: invalid scene file ${path}, expected default class export, skipping`);
        continue;
      }

      const SceneCtor = raw as Constructor<IBaseScene & Record<string, unknown>>;
      const scene = new SceneCtor();

      if (!scene || typeof scene !== "object" || !("stage" in scene)) {
        logger.warn(`initApp: invalid scene file ${path}, skipping`);
        continue;
      }

      const legacy = scene as IBaseScene &
        Record<string, unknown> & { name?: string; type?: SceneType };
      const mutable = legacy as { name?: string; type?: SceneType; stage: Container | null };
      if (!mutable.name) {
        mutable.name = fileSceneName;
      }
      if (mutable.type === undefined) {
        mutable.type = SceneType.Normal;
      }
      if (!mutable.stage) {
        mutable.stage = new Container();
      }

      sceneManager.registerScene(legacy as IBaseScene);
    } catch (error) {
      logger.error(`initApp: failed to load scene file ${path}`, error);
    }
  }

  game.ticker.add((ticker) => {
    const dt = ticker.deltaTime;
    const current = sceneManager.currentScene;

    for (const scene of sceneManager.getAllScenes()) {
      if (scene.type === SceneType.Resident && scene.stage.visible) {
        scene.update?.(dt, scene.name, ticker);
      }
    }

    if (current) {
      current.update?.(dt, current.name, ticker);
    }

    game.render("frame");

    for (const scene of sceneManager.getAllScenes()) {
      if (scene.type === SceneType.Resident && scene.stage.visible && scene.lateUpdate) {
        scene.lateUpdate(dt, scene.name, ticker);
      }
    }

    if (current?.lateUpdate) {
      current.lateUpdate(dt, current.name, ticker);
    }
  });

  const residentScenes: BaseScene[] = [];
  for (const scene of sceneManager.getAllScenes()) {
    if (scene.type === SceneType.Resident) {
      residentScenes.push(scene as BaseScene);
    }
  }

  for (const scene of residentScenes) {
    try {
      if (!scene._assetsLoaded) {
        await scene.loadBundle?.();
        scene._assetsLoaded = true;
      }
      if (!scene._layoutDone) {
        await scene.layout?.();
        scene._layoutDone = true;
      }
      await scene.onLoad?.();
    } catch (error) {
      logger.error(`initApp: failed to initialize resident scene ${scene.name}`, error);
    }
  }

  const entryScene = "init";
  if (sceneManager.hasScene(entryScene)) {
    await sceneManager.initScene(entryScene);
  } else {
    logger.error(`initApp: entry scene "${entryScene}" not found`);
  }

  sceneManager.onStageChange((current) => {
    logger.debug("Scene changed to", current.name);
  });

  logger.info("App initialized");
  appRuntime.markReady();
}

export { game, sceneManager, eventBus, assetManager, logger };