import { HttpHeaders } from '@angular/common/http';
import { Injectable, inject } from '@angular/core';
import { MARKETPLACES_AUTH_CONFIG } from './config';

export const MARKETPLACE_DOMAIN_HEADER = 'X-Marketplace-Domain';

export function normalizeMarketplaceDomain(domain: string): string {
  return domain.trim().toLowerCase().replace(/\.$/, '');
}

@Injectable({ providedIn: 'root' })
export class AuthMarketplaceContext {
  private readonly config = inject(MARKETPLACES_AUTH_CONFIG);

  domain(): string {
    const configured = this.config.marketplaceDomain;
    const domain = typeof configured === 'function'
      ? configured()
      : configured ?? (typeof location === 'undefined' ? '' : location.hostname);
    return normalizeMarketplaceDomain(domain);
  }

  headers(extra?: Record<string, string>): HttpHeaders {
    const domain = this.domain();
    if (!domain) throw new Error('Marketplace domain cannot be resolved');
    return new HttpHeaders({ [MARKETPLACE_DOMAIN_HEADER]: domain, ...extra });
  }
}