import { Injector } from '@angular/core';
import { Injectable, InjectionToken } from '@angular/core';
import { fromEvent, Subject } from 'rxjs';
import { takeUntil } from 'rxjs/operators';


@Injectable({
    providedIn: 'root'
})
export class DebugService {
    private destroy$ = new Subject();
    isDebug = false;
    // private key = 'FARRIS_DEBUGGING';
    // this.isDebug = !!window[this.key];
    constructor() {
    }

    destroy() {
        this.destroy$.next();
        this.destroy$.complete();
    }

    debug( msg: any, type: 'log' | 'warn' | 'error' | 'warn' = 'log') {
        if (this.isDebug) {
            console[type](msg);
        }
    }

    toggleDebugMode() {
        fromEvent(document.body, 'keydown').pipe(
            takeUntil(this.destroy$)
        ).subscribe( (e: KeyboardEvent) => {
            if (e.ctrlKey && e.shiftKey && e.key === 'D') {
                e.preventDefault();
                e.stopPropagation();
                this.isDebug = !this.isDebug;
                console.log(`Farris debug mode is ${ this.isDebug ? 'startting' : 'stopped'}.`);
            }
        });
    }
}