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 dataStore: { height: number, memoList: string[], addr: string, price: number } = { height: 0, memoList: [], addr: '', price:0 };
	private _heightUpdated: BehaviorSubject<number> = new BehaviorSubject(this.dataStore.height);
	private _memoUpdated: BehaviorSubject<string[]> = new BehaviorSubject(this.dataStore.memoList);
	private _addrUpdated: BehaviorSubject<string> = new BehaviorSubject(this.dataStore.addr);
	private _priceUpdated: BehaviorSubject<number> = new BehaviorSubject(this.dataStore.price);
	public readonly addrUpdate: Observable<string> = this._addrUpdated.asObservable();
	public readonly heightUpdate: Observable<number> = this._heightUpdated.asObservable();
	public readonly memoUpdate: Observable<string[]> = this._memoUpdated.asObservable();
	public readonly priceUpdate: Observable<number> = this._priceUpdated.asObservable();
	private UserSub: Subscription = new Subscription();

	constructor(private http: HttpClient, public userService: UserService){
		this.getAddr();
		this.getHeight();
		this.getMemos();
		this.getPrice();
	}

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

		return obs;
	}

	getPrice(){
		let obs = this.http.get<{message: string, price: number}>('http://localhost:3000/api/price');
		obs.subscribe((PriceData) => {
			this.dataStore.price = PriceData.price;
			console.log(this.dataStore.price);
			this._priceUpdated.next(Object.assign({},this.dataStore).price);
		});

		return obs;
	}

	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}`);
						const params = new HttpParams().append('session', session);
						this.http.get<{message: string, user: any}>('http://localhost:3000/api/getuser', { headers:{}, params: params, observe: 'response'}).
						subscribe((UserDataResponse) => {
							console.log(UserDataResponse.status);
							if (UserDataResponse.status == 200){
								console.log(`FS: Found user`);
							} else {
								console.log('FS: Did not find user');
								this.userService.addUser(address, session, blocktime);
							}
						});
					}
				}
			}
			this.dataStore.memoList = memos;
			this._memoUpdated.next(Object.assign({},this.dataStore).memoList);
		});
	}


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

		obs.subscribe((AddrData) => {
			this.dataStore.addr = AddrData.addr;
			this._addrUpdated.next(Object.assign({}, this.dataStore).addr);
		});

		return obs;
	}
}