import type { Container } from "../container/Container";
import type { ProviderToken } from "../container/types";

/**
 * AlveoApplication is the main class representing an Alveo application instance.
 * It provides methods to interact with the dependency injection container and manage the application lifecycle.
 */
export class AlveoApplication {
	constructor(private readonly container: Container) {}

	/**
	 * Retrieves an instance of a provider from the application container.
	 *
	 * @param token The provider token (Class, String, or Symbol)
	 * @returns A promise resolving to the instance of the provider
	 */
	public async get<T>(token: ProviderToken<T>): Promise<T> {
		return this.container.get(token);
	}

	/**
	 * Initializes the application by calling lifecycle hooks on all providers.
	 * This is called automatically by AlveoFactory.create().
	 */
	public async init(): Promise<this> {
		await this.container.callLifecycleHook("onModuleInit");
		await this.container.callLifecycleHook("onApplicationBootstrap");
		return this;
	}

	/**
	 * Gracefully shuts down the application by calling lifecycle hooks.
	 *
	 * @param signal The signal that triggered the shutdown
	 */
	public async close(signal?: string): Promise<void> {
		await this.container.callLifecycleHook("onModuleDestroy", signal);
		await this.container.callLifecycleHook(
			"beforeApplicationShutdown",
			signal,
		);
		await this.container.callLifecycleHook("onApplicationShutdown", signal);
	}
}