simple replacement for angular1 $log service - include an rxjs observable debugger and some helper for android's web apps

$log.ts

/*
 * Antonio Gallo - https://www.antoniogallo.it - http://www.badpenguin.org/
 * simple replacement for angular1 $log service
 */

// makes TS compiler happy
import {jStringify} from "./helpers";
import {Observable} from "rxjs";

declare let console: any;


export class $log {

	static has_debug: boolean = true;

	static is_android: boolean = false;
	static is_android_emulator: boolean = false;

	static error( ...args: any[] ) : void {
		//( console && console.error ) && console.error( ...args );
		if ( console && console.error ) {
			if ($log.is_android && Array.prototype.slice.call(args).length>1) {
				console.error(args[0]+': '+jStringify(args[1]));
			} else {
				console.error( ...args );
			}
		}
	}

	static warn( ...args: any[] ) : void {
		//( console && console.warn ) && console.warn( ...args );
		if ( console && console.warn ) {
			if ($log.is_android && Array.prototype.slice.call(args).length>1) {
				console.warn(args[0]+': '+jStringify(args[1]));
			} else {
				console.warn( ...args );
			}
		}
	}

	static info( ...args: any[] ) : void {
		//( console && console.info ) && console.info( ...args );
		if ( console && console.info ) {
			if ($log.is_android && Array.prototype.slice.call(args).length>1) {
				console.info(args[0]+': '+jStringify(args[1]));
			} else {
				console.info( ...args );
			}
		}
	}

	// NOTE: not using .debug() because of the colours in google chrome
	static debug( ...args: any[] ) : void {
		// SKIP debugging
		if (!$log.has_debug) {
			return;
		}
		//( $log.has_debug && console && console.debug ) && console.debug( ...args );
		if ( console && console.log ) {
			if ($log.is_android && Array.prototype.slice.call(args).length>1) {
				console.log(args[0]+': '+jStringify(args[1]));
			} else {
				console.log( ...args );
			}
		}
	}

	// TODO bugged?
	static log( ...args: any[] ) : void {
		//( console && console.log ) && console.log( ...args );
		if ( !console ) return;
		if ( console.debug ) {
			if ($log.is_android && Array.prototype.slice.call(args).length>1) {
				console.debug(args[0]+': '+jStringify(args[1]));
			} else {
				console.debug( ...args );
			}
		}
		else
		if ( console.log ) {
			if ($log.is_android && Array.prototype.slice.call(args).length>1) {
				console.log(args[0]+': '+jStringify(args[1]));
			} else {
				console.log( ...args );
			}
		}
	}


	static boolean(arg1:string, arg2:boolean) : void {
		$log.debug(arg1+': '+(arg2?'true':'false'));
	}


	static object(arg1:string, arg2:any) : void {
		$log.debug(arg1+': '+ jStringify(arg2) );
	}

}

/*
 * http://blog.angular-university.io/debug-rxjs/
 */

declare module 'rxjs/Observable' {
	interface Observable<T> {
		debug: (message:string, oncomplete?:boolean, showData?:boolean) => Observable<T>;
	}
}

Observable.prototype.debug = function (message:string, oncomplete:boolean=false, showData:boolean=false ) {
	return this.do(
		function (next:any) {
			if ($log.has_debug) {
				if (showData) {
					$log.debug('OK '+message,next);
				} else {
					$log.debug('OK',message);
				}
			}
		},
		function (err:any) {
			if ($log.has_debug) {
				$log.error('ERROR: '+message,err);
			}
		},
		function () {
			if (oncomplete && $log.has_debug) {
				$log.debug('COMPLETED',message);
			}
		}
	);
};


// initialize variable when loading
$log.is_android = window.navigator.userAgent.match(/android/i) != null;
$log.is_android_emulator = $log.is_android && window.navigator.userAgent.match(/sdk/i) != null;