import { AppKernel } from '../../app/AppKernel';
import { AsyncStateMachine } from '../../framework/state/AsyncStateMachine';
import { CheckVersionState } from './states/CheckVersionState';
import { CompleteState } from './states/CompleteState';
import { EnterLobbyState } from './states/EnterLobbyState';
import { FailedState } from './states/FailedState';
import { HotUpdateState } from './states/HotUpdateState';
import {
  LaunchContext,
  LaunchProgress,
  LaunchState,
  LaunchStateId,
} from './states/LaunchState';
import { PreloadLobbyState } from './states/PreloadLobbyState';

export type { LaunchProgress } from './states/LaunchState';

export type LaunchProgressHandler = (value: LaunchProgress) => void;

/**
 * 启动业务状态机。
 *
 * 负责版本检测、热更新、资源预加载、场景切换和统一失败处理，
 */
export class LaunchStateMachine {
  private readonly machine = new AsyncStateMachine<LaunchStateId>();

  constructor(private readonly context: LaunchContext) {
    this.registerStates();
  }

  get current(): LaunchStateId | null {
    return this.machine.current;
  }

  async run(): Promise<void> {
    try {
      await this.machine.start(LaunchStateId.CheckVersion);
    } catch (error) {
      this.context.error = error;
      await this.machine.transition(LaunchStateId.Failed);
    }
  }

  private registerStates(): void {
    const states: LaunchState[] = [
      new CheckVersionState(),
      new HotUpdateState(),
      new PreloadLobbyState(),
      new EnterLobbyState(),
      new CompleteState(),
      new FailedState(),
    ];

    for (const state of states) {
      this.machine.register(state.id, () => state.enter(this.context));
    }
  }
}