import { inject, Injectable, Signal, signal } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { LoginView } from '../models/LoginView.model';
import { firstValueFrom, Observable, tap } from 'rxjs';
import { Router } from '@angular/router';
import { EndpointService } from './EndpointService';

@Injectable({
    providedIn: 'root',
})
export class AuthService {
    private readonly _accessToken = signal<string | null>(null);
    private readonly _username = signal<string | null>(null);

    public readonly accessToken: Signal<string | null> = this._accessToken;
    public readonly username: Signal<string | null> = this._username;

    private readonly http = inject(HttpClient);
    private readonly router = inject(Router);
    private readonly endpointService = inject(EndpointService);

    public async login(username: string, password: string): Promise<LoginView> {
        const loginView = await firstValueFrom(
            this.http.post<LoginView>(
                this.endpointService.getUrl('authLogin'),
                { username, password },
                {
                    withCredentials: true,
                },
            ),
        );
        this._accessToken.set(loginView.accessToken);
        this._username.set(loginView.username);
        return loginView;
    }

    public async logout(): Promise<void> {
        await firstValueFrom(this.http.post(this.endpointService.getUrl('authLogout'), null));
        this._username.set(null);
        this._accessToken.set(null);
        await this.router.navigate(['/']);
    }

    public refresh(): Observable<LoginView> {
        this._accessToken.set(null);
        this._username.set(null);
        return this.http
            .post<LoginView>(this.endpointService.getUrl('authRefresh'), null, {
                withCredentials: true,
            })
            .pipe(
                tap((loginView) => {
                    this._username.set(loginView.username);
                    this._accessToken.set(loginView.accessToken);
                }),
            );
    }
}