import {Injectable} from '@angular/core';
import {Subject, Subscription, BehaviorSubject, Observable} from 'rxjs';
import {HttpClient, HttpParams} from '@angular/common/http';
import {UserService} from './user.service';

//import {User} from './user.model';

@Injectable({providedIn: 'root'})
export class FullnodeService{
	private height = 0;
	private memoList: string[] = [];
	private addr: string  = '';
	private _heightUpdated: BehaviorSubject<number> = new BehaviorSubject(this.height);
	private _memoUpdated: BehaviorSubject<string[]> = new BehaviorSubject(this.memoList);
	private _addrUpdated: BehaviorSubject<string> = new BehaviorSubject(this.addr);
	public readonly addrUpdate: Observable<string> = this._addrUpdated.asObservable();
	public readonly heightUpdate: Observable<number> = this._heightUpdated.asObservable();
	public readonly memoUpdate: Observable<string[]> = this._memoUpdated.asObservable();
	private UserSub: Subscription = new Subscription();

	constructor(private http: HttpClient, public userService: UserService){
	}

	getHeight(){
		let obs = this.http.get<{message: string, height: number}>('http://localhost:3000/api/blockheight');
		obs.subscribe((BlockData) => {
			this.height = BlockData.height;
			this._heightUpdated.next(this.height);
		});

		return obs;
	}

	//getHeightUpdateListener() {
		//return this.heightUpdated;
	//}

	hexToString(hexString: string) {
		var str = '';
		for (var n=0; n < hexString.length; n +=2) {
			str += String.fromCharCode(parseInt(hexString.substr(n, 2), 16));
		}
		return str;
	}

	getMemos() {
		this.http.get<{message: string, txs: any}>('http://localhost:3000/api/txs').
		subscribe((TxData) => {
			var memos: string[] = [];
			//this.addr = TxData.addr;
			var re = /.*S4ZEC::(.*)\sReply-To:\s(z\w+)/;
			for (var i=0; i < TxData.txs.length; i++) {
				var memo = this.hexToString(TxData.txs[i].memo);
				//console.log(TxData.txs[i].blocktime);
				if (re.test(memo)){
					memos.push(memo);
					var match = re.exec(memo);
					if (match != null) {
						var address = match[2];
						var session = match[1];
						var blocktime = TxData.txs[i].blocktime;
						console.log(memo);
						console.log(`Searching for user for ${session}`);
						this.userService.getUser(session);
						this.UserSub = this.userService.getZaddrUpdateListener().
							subscribe((zAddr) => {
							if (zAddr.length == 0) {
								console.log('FS: getMemos new adding user');
								this.userService.addUser(address, session, blocktime);
							} else {
								console.log('FS: getMemos found user');
							}
						});
					}
				}
			}
			this.memoList = memos;
			this._memoUpdated.next(this.memoList);
		});
	}

	//getMemoUpdateListener() {
		//return this.memoUpdated;
	//}

	getAddr() {
		this.http.get<{message: string, addr: string}>('http://localhost:3000/api/getaddr').
		subscribe((AddrData) => {
			this.addr = AddrData.addr;
			this._addrUpdated.next(this.addr);
		});
	}

	//getAddrUpdateListener() {
		//return this.addrUpdated;
	//}
	
}