import { Injectable, WritableSignal, signal } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { environment } from 'src/environments/environment';
import { first, firstValueFrom } from 'rxjs';

export enum Role {
    Admin = 3,
    Employer = 2,
    User = 1,
    API = 0,
    Deactivated = -1,
}

export interface User {
    username: string;
    role: Role;
    projects: string[];
}
export interface ThisUser extends User {
    chats: string[];
    email: string;
}

@Injectable({
    providedIn: 'root'
})
export class UsersService {
    private readonly url = environment.apiURL + '/users';
    public $user = signal<ThisUser | undefined>(undefined);

    public get token() {
        return localStorage.getItem('token') ?? undefined;
    }
    public set token(token: string | undefined) {
        if (token === undefined) localStorage.removeItem('token');
        else localStorage.setItem('token', token);
    }

    public async updateUser() {
        if (this.token) {
            const user = await firstValueFrom(this.http.get<ThisUser>(`${this.url}/get?token=${this.token}`));
            this.$user.set(user);
        }
        else this.$user.set(undefined);
    }

    public async logoff() {
        if (!this.token) return;
        await firstValueFrom(this.http.post(this.url + `/logout?token=${this.token}`, {}));
        this.token = undefined;
        this.$user.set(undefined);
    }
    public async login(username: string, password: string) {
        await this.logoff();
        const token = (await firstValueFrom(this.http.post<any>(this.url + `/login`, { username, password }))).token;
        this.token = token;
        await this.updateUser();
    }
    public async signup(username: string, password: string, email: string) {
        await this.logoff();
        await firstValueFrom(this.http.post(this.url + `/signup`, { username, password, email }));
        await this.updateUser();
    }

    public async requestCode(username: string) {
        await firstValueFrom(this.http.post<string>(this.url + `/requestCode`, { username }));
    }
    public async confirm(username: string, code: string) {
        await firstValueFrom(this.http.post<string>(this.url + `/confirm`, { username, code }));
    }

    public async all() {
        return await firstValueFrom(this.http.get<User[]>(this.url + `/all`));
    }

    public constructor(private http: HttpClient) {
        this.updateUser();
    }
}