import { Component, ChangeDetectionStrategy, Renderer2, inject, DOCUMENT, computed } from '@angular/core';
import { Router, RouterLink, RouterLinkActive } from '@angular/router';
import { CartService } from '../../services/cart.service';
import { LanguageService } from '../../services/language.service';
import { LogoComponent } from '../logo/logo.component';
import { LanguageSelectorComponent } from '../language-selector/language-selector.component';
import { RegionSelectorComponent } from '../region-selector/region-selector.component';
import { LangRoutePipe } from '../../pipes/lang-route.pipe';
import { TranslatePipe } from '../../i18n/translate.pipe';
import { UiRuntimeFacade } from '../../facades/runtime/ui-runtime.facade';
import { UserExperienceFacade } from '../../facades/platform/user-experience.facade';
import { ConfigService } from '../../core/config/config.service';
import { FeatureConfigService } from '../../core/config/feature-config.service';
import { DEFAULT_HEADER_CONFIG, DEFAULT_USER_EXPERIENCE_CONFIG } from '../../shared/models/config';
import { StaticPageResolverService } from '../../core/config/static-page-resolver.service';
import { IconComponent } from '../../shared/ui/icon/icon.component';
import { AuthService } from '../../services/auth.service';
import { TelegramLoginComponent } from '../telegram-login/telegram-login.component';

@Component({
  selector: 'app-header',
  imports: [RouterLink, RouterLinkActive, LogoComponent, LanguageSelectorComponent, RegionSelectorComponent, LangRoutePipe, TranslatePipe, IconComponent, TelegramLoginComponent],
  templateUrl: './header.component.html',
  styleUrls: ['./header.component.scss'],
  changeDetection: ChangeDetectionStrategy.OnPush
})
export class HeaderComponent {
  cartItemCount;
  cartTotal;
  menuOpen = false;

  private renderer = inject(Renderer2);
  private document = inject(DOCUMENT);
  private langService = inject(LanguageService);
  private uiRuntime = inject(UiRuntimeFacade);
  private uxFacade = inject(UserExperienceFacade);
  private configService = inject(ConfigService);
  private featureConfig = inject(FeatureConfigService);
  private staticPageResolver = inject(StaticPageResolverService);
  private authService = inject(AuthService);

  readonly isAuthenticated = this.authService.isAuthenticated;
  readonly wishlistCount = this.uxFacade.wishlistCount;
  readonly compareCount = this.uxFacade.compareCount;
  readonly userExperienceConfig = computed(() => this.resolveUserExperienceConfig());
  readonly headerConfig = computed(() => this.resolveHeaderConfig());
  readonly features = this.featureConfig.features;
  readonly headerPages = computed(() => this.resolveHeaderPages());

  constructor(private cartService: CartService, private router: Router) {
    this.cartItemCount = this.cartService.itemCount;
    this.cartTotal = this.cartService.totalPrice;
  }

  get brandName(): string {
    return this.uiRuntime.marketplaceDisplayName();
  }

  get logo(): string {
    return this.uiRuntime.logoUrl();
  }

  get homeUrl(): string {
    return `/${this.langService.currentLanguage()}`;
  }

  toggleMenu(): void {
    this.menuOpen = !this.menuOpen;
    if (this.menuOpen) {
      this.renderer.addClass(this.document.body, 'platform-menu-open');
    } else {
      this.renderer.removeClass(this.document.body, 'platform-menu-open');
    }
  }

  closeMenu(): void {
    this.menuOpen = false;
    this.renderer.removeClass(this.document.body, 'platform-menu-open');
  }

  navigateHome(event?: Event): void {
    event?.preventDefault();
    this.closeMenu();

    const homeUrl = this.homeUrl;
    const currentUrl = this.router.url.split('?')[0].split('#')[0];

    if (currentUrl === homeUrl || currentUrl === `${homeUrl}/`) {
      this.document.defaultView?.scrollTo({ top: 0, behavior: 'smooth' });
      return;
    }

    this.router.navigateByUrl(homeUrl).then(() => {
      this.document.defaultView?.scrollTo({ top: 0, behavior: 'auto' });
    });
  }

  navigateToSearch(): void {
    const lang = this.langService.currentLanguage();
    this.router.navigate([`/${lang}/search`]);
  }

  navigateToCatalog(): void {
    this.closeMenu();
    const lang = this.langService.currentLanguage();
    this.router.navigate([`/${lang}`]).then(() => {
      setTimeout(() => {
        this.document.getElementById('catalog')?.scrollIntoView({ behavior: 'smooth' });
      }, 100);
    });
  }

  navigateToWishlist(): void {
    this.closeMenu();
    const lang = this.langService.currentLanguage();
    this.router.navigate([`/${lang}/wishlist`]);
  }

  navigateToCompare(): void {
    this.closeMenu();
    const lang = this.langService.currentLanguage();
    this.router.navigate([`/${lang}/compare`]);
  }

  login(): void {
    this.authService.requestLogin();
  }

  logout(): void {
    this.authService.logout();
  }

  navigateToStatic(route: string): void {
    this.closeMenu();
    const lang = this.langService.currentLanguage();
    this.router.navigate([`/${lang}${route.startsWith('/') ? route : `/${route}`}`]);
  }

  formatCartTotal(total: number): string {
    const locale = this.langService.currentLanguage() === 'en'
      ? 'en-US'
      : this.langService.currentLanguage() === 'hy'
        ? 'hy-AM'
        : 'ru-RU';
    const fractionDigits = Number.isInteger(total) ? 0 : 2;
    const amount = new Intl.NumberFormat(locale, {
      minimumFractionDigits: fractionDigits,
      maximumFractionDigits: 2,
    }).format(total);
    const currencySymbol = this.langService.getCurrentCurrency()?.symbol ?? this.langService.currentCurrency();

    return `${amount} ${currencySymbol}`;
  }

  private resolveUserExperienceConfig() {
    this.configService.bootstrapRevision();
    const raw = (this.configService.getBootstrapSnapshot() as any)?.userExperience ?? {};

    return {
      ...DEFAULT_USER_EXPERIENCE_CONFIG,
      ...raw,
      wishlist: {
        ...DEFAULT_USER_EXPERIENCE_CONFIG.wishlist,
        ...(raw.wishlist ?? {})
      },
      compare: {
        ...DEFAULT_USER_EXPERIENCE_CONFIG.compare,
        ...(raw.compare ?? {})
      }
    };
  }

  private resolveHeaderConfig() {
    this.configService.bootstrapRevision();
    const raw = (this.configService.getBootstrapSnapshot() as any)?.header ?? {};

    return {
      ...DEFAULT_HEADER_CONFIG,
      ...raw,
    };
  }

  private resolveHeaderPages() {
    this.configService.bootstrapRevision();
    const bootstrap = this.configService.getBootstrapSnapshot();
    if (!bootstrap?.staticPages) {
      return [] as Array<{ id: string; title: string; route: string; icon?: string; order: number }>;
    }

    const lang = this.langService.currentLanguage();
    const pages = Object.values(bootstrap.staticPages as Record<string, any>)
      .filter(page => page.showInHeader === true)
      .map(page => {
        const resolved = this.staticPageResolver.resolveByKeyFromBootstrap(bootstrap, page.id, lang);
        return resolved ? {
          id: resolved.id,
          title: resolved.title,
          route: resolved.route,
          icon: resolved.icon,
          order: page.order ?? 0,
        } : null;
      })
      .filter((page): page is { id: string; title: string; route: string; icon: string | undefined; order: number } => page !== null);

    return pages.sort((left, right) => left.order - right.order);
  }
}