import { Component, OnInit, OnDestroy, signal, ChangeDetectionStrategy, inject } from '@angular/core';
import { DecimalPipe } from '@angular/common';
import { FormsModule } from '@angular/forms';
import { ActivatedRoute, RouterLink } from '@angular/router';
import { ApiService, CartService, TelegramService, SeoService } from '../../services';
import { Item } from '../../models';
import { DomSanitizer, SafeHtml } from '@angular/platform-browser';
import { Subscription } from 'rxjs';
import { environment } from '../../../environments/environment';
import { SecurityContext } from '@angular/core';
import { getDiscountedPrice } from '../../utils/item.utils';

@Component({
  selector: 'app-item-detail',
  imports: [DecimalPipe, RouterLink, FormsModule],
  templateUrl: './item-detail.component.html',
  styleUrls: ['./item-detail.component.scss'],
  changeDetection: ChangeDetectionStrategy.OnPush
})
export class ItemDetailComponent implements OnInit, OnDestroy {
  item = signal<Item | null>(null);
  selectedPhotoIndex = signal(0);
  loading = signal(true);
  error = signal<string | null>(null);
  isnovo = environment.theme === 'novo';
  
  newReview = {
    rating: 0,
    comment: '',
    anonymous: false
  };
  
  reviewSubmitStatus = signal<'idle' | 'loading' | 'success' | 'error'>('idle');
  
  private routeSubscription?: Subscription;
  private reviewResetTimeout?: ReturnType<typeof setTimeout>;
  private reviewErrorTimeout?: ReturnType<typeof setTimeout>;
  private reloadTimeout?: ReturnType<typeof setTimeout>;

  private seoService = inject(SeoService);

  constructor(
    private route: ActivatedRoute,
    private apiService: ApiService,
    private cartService: CartService,
    private telegramService: TelegramService,
    private sanitizer: DomSanitizer
  ) {}

  ngOnInit(): void {
    this.routeSubscription = this.route.params.subscribe(params => {
      const id = parseInt(params['id'], 10);
      this.loadItem(id);
    });
  }

  ngOnDestroy(): void {
    this.routeSubscription?.unsubscribe();
    if (this.reviewResetTimeout) clearTimeout(this.reviewResetTimeout);
    if (this.reviewErrorTimeout) clearTimeout(this.reviewErrorTimeout);
    if (this.reloadTimeout) clearTimeout(this.reloadTimeout);
    this.seoService.resetToDefaults();
  }

  loadItem(itemID: number): void {
    this.loading.set(true);
    
    this.apiService.getItem(itemID).subscribe({
      next: (item) => {
        this.item.set(item);
        this.seoService.setItemMeta(item);
        this.loading.set(false);
      },
      error: (err) => {
        this.error.set('Failed to load item');
        this.loading.set(false);
        console.error('Error loading item:', err);
      }
    });
  }

  selectPhoto(index: number): void {
    this.selectedPhotoIndex.set(index);
  }

  addToCart(): void {
    const currentItem = this.item();
    if (currentItem) {
      this.cartService.addItem(currentItem.itemID);
    }
  }

  getDiscountedPrice(): number {
    const currentItem = this.item();
    if (!currentItem) return 0;
    return getDiscountedPrice(currentItem);
  }

  getSafeHtml(html: string): SafeHtml {
    return this.sanitizer.sanitize(SecurityContext.HTML, html) || '';
  }

  getRatingStars(rating: number): string {
    const fullStars = Math.floor(rating);
    const hasHalfStar = rating % 1 >= 0.5;
    let stars = '★'.repeat(fullStars);
    if (hasHalfStar) stars += '☆';
    return stars;
  }

  formatDate(timestamp: string): string {
    const date = new Date(timestamp);
    const now = new Date();
    const diffMs = now.getTime() - date.getTime();
    const diffDays = Math.floor(diffMs / (1000 * 60 * 60 * 24));

    if (diffDays === 0) return 'Сегодня';
    if (diffDays === 1) return 'Вчера';
    if (diffDays < 7) return `${diffDays} дн. назад`;
    if (diffDays < 30) return `${Math.floor(diffDays / 7)} нед. назад`;
    
    return date.toLocaleDateString('ru-RU', { 
      day: 'numeric', 
      month: 'long', 
      year: 'numeric' 
    });
  }

  setRating(rating: number): void {
    this.newReview.rating = rating;
  }

  getUserDisplayName(): string | null {
    if (!this.telegramService.isTelegramApp()) {
      return 'Пользователь';
    }
    return this.telegramService.getDisplayName();
  }

  submitReview(): void {
    if (!this.newReview.rating || !this.newReview.comment.trim()) {
      return;
    }

    const currentItem = this.item();
    if (!currentItem) return;

    this.reviewSubmitStatus.set('loading');

    const reviewData = {
      itemID: currentItem.itemID,
      rating: this.newReview.rating,
      comment: this.newReview.comment.trim(),
      username: this.newReview.anonymous ? null : this.getUserDisplayName(),
      userId: this.telegramService.getUserId(),
      timestamp: new Date().toISOString()
    };

    this.apiService.submitReview(reviewData).subscribe({
      next: (response) => {
        this.reviewSubmitStatus.set('success');
        this.newReview = { rating: 0, comment: '', anonymous: false };
        
        // Сброс состояния через 3 секунды
        this.reviewResetTimeout = setTimeout(() => {
          this.reviewSubmitStatus.set('idle');
        }, 3000);
        
        // Перезагрузить данные товара после отправки отзыва
        this.reloadTimeout = setTimeout(() => {
          this.loadItem(currentItem.itemID);
        }, 500);
      },
      error: (err) => {
        console.error('Error submitting review:', err);
        this.reviewSubmitStatus.set('error');
        
        // Сброс состояния об ошибке через 5 секунд
        this.reviewErrorTimeout = setTimeout(() => {
          this.reviewSubmitStatus.set('idle');
        }, 5000);
      }
    });
  }
}