import { Injectable } from '@angular/core';
import { Config } from '../_models/generated/Config';
import { app, webviewWindow as appWindow} from '@tauri-apps/api';
import { Subject, debounceTime, from } from 'rxjs';
import { EventsService } from './events.service';
// import { appWindow, WebviewWindow } from 'webviewWindow'
import { invoke } from '@tauri-apps/api/core';

@Injectable({
  providedIn: 'root'
})
export class ConfigService {
  private cfg!: Config;
  private proxied!: Config;
  private syncSubject: Subject<void> = new Subject<void>();

  constructor(events: EventsService) {
    this.syncSubject.pipe(debounceTime(100)).subscribe(() => this.underlyingSync());
    events.listen<Config>("config").subscribe(cfg => Object.assign(this.cfg, cfg.payload));
  }

  get config() {
    return this.proxied;
  }

  init() {
    return invoke<Config>('load_config').then(cfg => {
      if (!cfg) {
        console.error("Could not load config, should generally not happen :')");
        return;
      }

      const _this = this;
      this.cfg = cfg;
      // Mostly to wrap setters so we can run the (debounced) sync function on any config changes!
      this.proxied = new Proxy(this.cfg, {
        get(target: any, property) {
          return target[property as keyof Config];
        },
        set(target: Config, property: any, value) {
          setConfig(target, property, value);
          _this.sync();
          return true;
        }
      });

    });
  }

  sync() {
    let target = "Normal"

    if (appWindow.getCurrent().label == "Normal") {
      target = "Overlay";
    }

    const targetWindow = appWindow.WebviewWindow.getByLabel(target);
    if (targetWindow) {
      from(targetWindow.isVisible()).subscribe(visible => {
        if (visible) {
          targetWindow?.emit("config", this.cfg);
        }
      });
    }
    this.syncSubject.next();
  }

  private underlyingSync() {
    invoke('update_config', { config: this.config });
  }
}

function setConfig<T extends keyof Config>(target: Config, property: T, value: Config[T]) {
  target[property] = value;
}