import { inject, Injectable } from '@angular/core';
import { HttpHeaders } from '@angular/common/http';
import { CookieService } from 'ngx-cookie-service';
import { Login } from '../models/auth.models';

@Injectable({
	providedIn: 'root',
})
export class HeadersService {
	private cookieSrv = inject(CookieService);
	private headersVal = new HttpHeaders();
	setTokenCookie({ token, expire_unixtime }: Login) {
		this.cookieSrv.set('token', token, new Date(expire_unixtime * 1000), '/');
	}
	getHeaders() {
		this.setHeaders();
		return this.headersVal;
	}
	clearHeaders() {
		this.cookieSrv.delete('token');
		this.headersVal = this.headersVal.delete('Authorization');
		this.headersVal = this.headersVal.delete('X-Requested-With');
	}
	// Verifica existencia de cookie uuid
	// Si no existe la cookie uuid la crea
	private uuidCheck() {
		if (!this.cookieSrv.check('uuid')) {
			const uuid = this.uuidGenerator();
			this.cookieSrv.set('uuid', uuid, 365, '/');
			return uuid;
		}
		return this.cookieSrv.get('uuid');
	}
	// Función privada para generar un uuid aleatorio
	private uuidGenerator() {
		return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (character) => {
			const randomNum = (Math.random() * 16) | 0;
			const value = character === 'x' ? randomNum : (randomNum & 0x3) | 0x8;
			return value.toString(16);
		});
	}
	// Función que establece los headers http
	private setHeaders() {
		this.headersVal = this.headersVal.set('Content-Type', 'application/json; charset=utf-8');
		this.headersVal = this.headersVal.set('X-Requested-With', this.uuidCheck());
		this.headersVal = this.headersVal.set('Authorization', `Bearer ${this.cookieSrv.get('token')}`);
	}
}

export const injectHeadersService = () => inject(HeadersService);