import { Component, OnInit, OnDestroy, Injectable } from '@angular/core';
import { CanActivate, Router, RouterStateSnapshot, ActivatedRouteSnapshot } from '@angular/router';
import { UserService } from '../user.service';
import { FullnodeService } from '../fullnode.service';
import { Subscription } from 'rxjs';
import { v4 as uuidv4 } from 'uuid';
var QRCode = require('easyqrcodejs');
var URLSafeBase64 = require('urlsafe-base64');
var Buffer = require('buffer/').Buffer;


@Component({
	selector: 'app-login',
	templateUrl: './login.component.html',
	styleUrls: ['./login.component.css']
})

export class LoginComponent implements OnInit {
	memos: string[] = [];
	private FullnodeSub: Subscription = new Subscription();
	private UserSub: Subscription = new Subscription();
	constructor(
		public fullnodeService: FullnodeService,
		private router: Router,
		public userService: UserService
	){
	}

	ngOnInit(){
		this.fullnodeService.getMemos();
		this.fullnodeService.getAddr();
		var nodeAddr = this.fullnodeService.addrUpdate;
		var localToken = localStorage.getItem('s4z_token');
		console.log(localToken);
		if(localToken == null){
			var token = uuidv4();
			localStorage.setItem('s4z_token', token);
			console.log('Showing QR code for login');
			console.log(URLSafeBase64.encode(Buffer.from('S4ZEC::'.concat(token))));
			var codeString = `zcash:${nodeAddr}?amount=0.001&memo=${URLSafeBase64.encode(Buffer.from('S4ZEC::'.concat(token)))}`;
			console.log(codeString);
			var qrcode = new QRCode(document.getElementById("qrcode"), {
				text: codeString,
				logo: "/assets/zcash.png",
				logoWidth: 80,
				logoHeight: 80
			});
		} else {
			this.userService.getUser(localToken);
			this.userService.getZaddrUpdateListener().
				subscribe((userAddr: string) => {
				if (userAddr.length != 0) {
					console.log('Log in found!');
					//this.router.navigate(['/view']);
				} else {
					console.log('No login for existing token found');
					console.log('Showing QR code for login');
					//console.log(URLSafeBase64.encode(Buffer.from('S4ZEC::'.concat(localToken))));
					var codeString = `zcash:${nodeAddr}?amount=0.001&memo=${URLSafeBase64.encode(Buffer.from('S4ZEC::'.concat(localToken!)))}`;
					console.log(codeString);
					var qrcode = new QRCode(document.getElementById("qrcode"), {
						text: codeString,
						logo: "/assets/zcash.png",
						logoWidth: 80,
						logoHeight: 80
					});
				}
			});
		}
	}

	ngOnDestroy(){
		this.FullnodeSub.unsubscribe();
		this.UserSub.unsubscribe();
	}
}