import { Injectable, computed, inject } from '@angular/core';
import { LanguageService } from '../services/language.service';
import { Translations } from './translations';
import { ru } from './ru';
import { en } from './en';
import { hy } from './hy';

const translationMap: Record<string, Translations> = { ru, en, hy };

@Injectable({
  providedIn: 'root',
})
export class TranslateService {
  private langService = inject(LanguageService);

  readonly translations = computed<Translations>(
    () => translationMap[this.langService.currentLanguage()] ?? ru,
  );

  /**
   * Translate a dot-separated key with optional interpolation params.
   * Usage: t('cart.phoneMoreDigits', { count: 3 }) → "Введите ещё 3 цифр"
   */
  t(key: string, params?: Record<string, string | number>): string {
    const parts = key.split('.');
    let result: unknown = this.translations();

    for (const part of parts) {
      if (result && typeof result === 'object') {
        result = (result as Record<string, unknown>)[part];
      } else {
        return key;
      }
    }

    if (typeof result !== 'string') {
      return key;
    }

    if (params) {
      return result.replace(/\{\{(\w+)\}\}/g, (_, k) =>
        params[k] !== undefined ? String(params[k]) : `{{${k}}}`,
      );
    }

    return result;
  }
}