import {Injectable} from '@angular/core';
import {Subject, BehaviorSubject, Observable} from 'rxjs';
import {HttpClient, HttpParams, HttpHeaders} from '@angular/common/http';
import {User} from './user.model';
import {Owner} from './owner.model';
import { Country } from './country.model';
import {Tx} from './tx.model';

var Buffer = require('buffer/').Buffer;

@Injectable({providedIn: 'root'})

export class UserService{
	beUrl = 'http://localhost:3000/';
	private dataStore: { user: User, owner: Owner, txs: Tx[], countries: Country[]} = { 
		user: {
			address: '',
			session: '',
			blocktime: 0,
			pin: '',
			validated: false
		},
		owner: {
			address: '',
			name: '',
			currency: 'usd',
			tax: false,
			taxValue: 0,
			vat: false,
			vatValue: 0,
			first: '',
			last: '',
			email: '',
			street: '',
			city: '',
			state: '',
			postal: '',
			phone: '',
			paid: false,
			website: '',
			country: '',
			zats: false,
			invoices: false,
			expiration: new Date(Date.now()).toISOString()
		},
		txs : [],
		countries: []
	};
	private uZaddr = '';
	private oZaddr = '';
	private uName = '';
	private session: string | null = '';
	private _uZaddrUpdated: BehaviorSubject<string> = new BehaviorSubject(this.uZaddr);
	private _userUpdated: BehaviorSubject<User> = new BehaviorSubject(this.dataStore.user);
	private uNameUpdated = new Subject<string>();
	private _ownerUpdated: BehaviorSubject<Owner> = new BehaviorSubject(this.dataStore.owner);
	private _txsUpdated: BehaviorSubject<Tx[]> = new BehaviorSubject(this.dataStore.txs);
	private _paidUpdated: BehaviorSubject<boolean> = new BehaviorSubject(this.dataStore.owner.paid);
	private _countriesUpdated: BehaviorSubject<Country[]> = new BehaviorSubject(this.dataStore.countries);
	public readonly uZaddrUpdate: Observable<string> = this._uZaddrUpdated.asObservable();
	public readonly ownerUpdate: Observable<Owner> = this._ownerUpdated.asObservable();
	public readonly userUpdate: Observable<User> = this._userUpdated.asObservable();
	public readonly txUpdate: Observable<Tx[]> = this._txsUpdated.asObservable();
	public readonly paidUpdate: Observable<boolean> = this._paidUpdated.asObservable();
	public readonly countriesUpdate: Observable<Country[]> = this._countriesUpdated.asObservable();
	private reqHeaders: HttpHeaders;
	private apiKey = 'Le2adeic8Thah4Aeng4daem6i';

	constructor(private http: HttpClient){
		var auth = 'Basic ' + Buffer.from('user:superSecret').toString('base64');
		this.reqHeaders = new HttpHeaders().set('Authorization', auth);
		//console.log('US:', this.reqHeaders);
		this.session = localStorage.getItem('s4z_token');
		if (this.session != null) {
			this.findUser();
		}
	}

	getCountries() {
		let obs = this.http.get<{message: string, countries: any}>(this.beUrl+'api/countries', { headers: this.reqHeaders, observe: 'response'});

		obs.subscribe((CountryResponse) => {
			if (CountryResponse.status == 200) {
				this.dataStore.countries = CountryResponse.body!.countries;
				this._countriesUpdated.next(Object.assign({}, this.dataStore).countries);
			}
		});
	}

	findUser() {
		this.session = localStorage.getItem('s4z_token');
		if (this.session != null) {
			const params = new HttpParams().append('session', this.session!);
			let obs = this.http.get<{message: string, user: any}>(this.beUrl+'api/user', { headers: this.reqHeaders, params: params, observe: 'response'});

			obs.subscribe((UserDataResponse) => {
				console.log(UserDataResponse.status);
				if (UserDataResponse.status == 200){
					this.dataStore.user = UserDataResponse.body!.user;
					console.log(`US: Found user, returning it`);
					this._uZaddrUpdated.next(Object.assign({},this.dataStore).user.address);
					this._userUpdated.next(Object.assign({}, this.dataStore).user);
					this.getOwner(Object.assign({},this.dataStore.user).address);
				} else {
					this.dataStore.user = {
						address: '',
						session: '',
						blocktime: 0,
						pin: '',
						validated: false
					};
					this._uZaddrUpdated.next(Object.assign({},this.dataStore).user.address);
					this._userUpdated.next(Object.assign({}, this.dataStore).user);
					console.log('US: Did not find user');
				}
			});

			return obs;
		} else {
			console.log('No session loaded');
			return null;
		}
	}
	
	validateUser(pinString:string){
		const params = new HttpParams().append('session', this.dataStore.user.session).append('pin', pinString);
		this.http.post(this.beUrl+'api/validateuser', {}, {headers: this.reqHeaders, params: params, observe: 'response'}).
		subscribe((responseData) => {
			if (responseData.status == 202) {
				console.log('Pin validated!');
			} else {
				console.log('Wrong pin!');
			}
		});
	}

	addOwner(owner: Owner) {
		owner.address = this.dataStore.user.address;
		let obs = this.http.post(this.beUrl+'api/owner', {payload: owner}, {headers: this.reqHeaders});

		obs.subscribe((responseData) => {
			this.getOwner(this.dataStore.user.address);
		});

		return obs;
	}

	updateOwner(owner: Owner) {
		this.http.post<{message: string, owner: Owner}>(this.beUrl+'api/updateowner', {owner: owner}, {headers: this.reqHeaders}).
		subscribe((responseData) => {
			console.log(responseData.message);
			this.dataStore.owner = responseData.owner;
			this._ownerUpdated.next(Object.assign({},this.dataStore).owner);
		});
	}


	getOwner(address: string) {
		console.log('getOwner', address);
		const ownParams = new HttpParams().append('address', address);
		let obs = this.http.get<{message:string, owner: any}>(this.beUrl+'api/owner', { headers: this.reqHeaders, params: ownParams, observe: 'response'});

		obs.subscribe((OwnerDataResponse) => {
			console.log('api/getowner', OwnerDataResponse.status);
			if (OwnerDataResponse.status == 200) {
				this.dataStore.owner = OwnerDataResponse.body!.owner;
				//console.log('getOwner object', this.dataStore.owner);
				this._ownerUpdated.next(Object.assign({},this.dataStore).owner);
				this._paidUpdated.next(Object.assign({}, this.dataStore).owner.paid);
			}
		});

		return obs;
	}

	deleteUser() {
		let obs = this.http.delete<{message: string}>(this.beUrl+'api/user/'+this.dataStore.user._id, {headers: this.reqHeaders });

		obs.subscribe(UserResponse => {
			console.log('User delete request sent.');
			this.findUser();
		});

		return obs;
	}
}