import { inject, injectable } from '@theia/core/shared/inversify';
import {
  MonitorManagerProxy,
  MonitorManagerProxyClient,
  MonitorSettings,
  PluggableMonitorSettings,
} from '../common/protocol';
import { Board, Port } from '../common/protocol';
import { MonitorManager } from './monitor-manager';

@injectable()
export class MonitorManagerProxyImpl implements MonitorManagerProxy {
  protected client: MonitorManagerProxyClient;

  constructor(
    @inject(MonitorManager)
    protected readonly manager: MonitorManager
  ) {}

  dispose(): void {
    this.client?.disconnect();
  }

  /**
   * Start a pluggable monitor and/or change its settings.
   * If settings are defined they'll be set before starting the monitor,
   * otherwise default ones will be used by the monitor.
   * @param board board connected to port
   * @param port port to monitor
   * @param settings map of supported configuration by the monitor
   */
  async startMonitor(
    board: Board,
    port: Port,
    settings?: PluggableMonitorSettings
  ): Promise<void> {
    if (settings) {
      await this.changeMonitorSettings(board, port, settings);
    }

    const connectToClient = async () => {
      const address = this.manager.getWebsocketAddressPort(board, port);
      if (!this.client) {
        throw new Error(
          `No client was connected to this monitor manager. Board: ${
            board.fqbn ?? board.name
          }, port: ${port.address}, address: ${address}`
        );
      }
      await this.client.connect(address);
    };
    return this.manager.startMonitor(board, port, connectToClient);
  }

  /**
   * Changes the settings of a running pluggable monitor, if that monitor is not
   * started this function is a noop.
   * @param board board connected to port
   * @param port port monitored
   * @param settings map of supported configuration by the monitor
   */
  async changeMonitorSettings(
    board: Board,
    port: Port,
    settings: PluggableMonitorSettings
  ): Promise<void> {
    if (!this.manager.isStarted(board, port)) {
      // Monitor is not running, no need to change settings
      return;
    }
    return this.manager.changeMonitorSettings(board, port, settings);
  }

  /**
   * Stops a running pluggable monitor.
   * @param board board connected to port
   * @param port port monitored
   */
  async stopMonitor(board: Board, port: Port): Promise<void> {
    return this.manager.stopMonitor(board, port);
  }

  /**
   * Returns the current settings by the pluggable monitor connected to specified
   * by board/port combination.
   * @param board board connected to port
   * @param port port monitored
   * @returns a map of MonitorSetting
   */
  getCurrentSettings(board: Board, port: Port): Promise<MonitorSettings> {
    return this.manager.currentMonitorSettings(board, port);
  }

  setClient(client: MonitorManagerProxyClient | undefined): void {
    if (!client) {
      return;
    }
    this.client = client;
  }
}