import { EventSlot } from '../library-ts/browser/events/EventSlot.js';

export type ConsoleMessageType = 'info' | 'error' | 'hint';

export interface ConsoleMessage
{
  text: string;
  type: ConsoleMessageType;
  timestamp: Date;
}

export class EditorConsole
{
  static _instance: EditorConsole | null = null;

  static get(): EditorConsole
  {
    if ( !this._instance ) this._instance = new EditorConsole();
    return this._instance;
  }

  static readonly MAX_MESSAGES = 500;

  messages: ConsoleMessage[] = [];
  readonly onMessage: EventSlot<ConsoleMessage> = new EventSlot();
  readonly onHover: EventSlot<string | null> = new EventSlot();

  log( text: string, type: ConsoleMessageType = 'info' ): void
  {
    const msg: ConsoleMessage = { text, type, timestamp: new Date() };
    this.messages.push( msg );
    if ( this.messages.length > EditorConsole.MAX_MESSAGES ) this.messages.shift();
    this.onMessage.dispatch( msg );
  }

  showHover( text: string ): void
  {
    this.onHover.dispatch( text );
  }

  hideHover(): void
  {
    this.onHover.dispatch( null );
  }
}