/**
 * @copyright 2026 NHCarrigan
 * @license Naomi's Public License
 * @author Naomi Carrigan
 */

import { Component, OnInit, inject, signal, computed } from '@angular/core';
import { CommonModule } from '@angular/common';
import { RouterLink } from '@angular/router';
import { LikesService } from '../../services/likes.service';
import { AuthService } from '../../services/auth.service';
import { PaginationComponent } from '../shared/pagination.component';
import { LikeButtonComponent } from '../shared/like-button.component';
import { LikedItemDto, Like } from '@library/shared-types';

@Component({
  selector: 'app-my-likes',
  standalone: true,
  imports: [CommonModule, RouterLink, PaginationComponent, LikeButtonComponent],
  template: `
    <div class="container">
      <div class="header-section">
        <h2>My Likes</h2>
        <p class="subtitle">All the items you've liked across the library</p>
      </div>

      @if (!authService.isAuthenticated()) {
        <div class="not-authenticated">
          <p>Please log in to view your liked items.</p>
        </div>
      } @else if (loading()) {
        <div class="loading">Loading your liked items...</div>
      } @else if (likedItems().length === 0) {
        <div class="empty-state">
          <p>You haven't liked any items yet!</p>
          <p class="hint">Explore the library and click the heart button on items you enjoy.</p>
        </div>
      } @else {
        <div class="filters">
          <button
            (click)="setFilter('all')"
            [class.active]="typeFilter() === 'all'"
            class="filter-btn"
          >
            All ({{ likedItems().length }})
          </button>
          <button
            (click)="setFilter('book')"
            [class.active]="typeFilter() === 'book'"
            class="filter-btn"
          >
            Books ({{ bookCount() }})
          </button>
          <button
            (click)="setFilter('game')"
            [class.active]="typeFilter() === 'game'"
            class="filter-btn"
          >
            Games ({{ gameCount() }})
          </button>
          <button
            (click)="setFilter('show')"
            [class.active]="typeFilter() === 'show'"
            class="filter-btn"
          >
            Shows ({{ showCount() }})
          </button>
          <button
            (click)="setFilter('manga')"
            [class.active]="typeFilter() === 'manga'"
            class="filter-btn"
          >
            Manga ({{ mangaCount() }})
          </button>
          <button
            (click)="setFilter('music')"
            [class.active]="typeFilter() === 'music'"
            class="filter-btn"
          >
            Music ({{ musicCount() }})
          </button>
          <button
            (click)="setFilter('art')"
            [class.active]="typeFilter() === 'art'"
            class="filter-btn"
          >
            Art ({{ artCount() }})
          </button>
        </div>

        <app-pagination
          [currentPage]="currentPage()"
          [pageSize]="pageSize()"
          [totalItems]="totalFilteredItems()"
          (pageChange)="onPageChange($event)"
          (pageSizeChange)="onPageSizeChange($event)"
        ></app-pagination>

        <div class="liked-items-grid">
          @for (likedItem of paginatedItems(); track likedItem.like.id) {
            <div class="liked-item-card">
              <div class="item-type-badge">{{ getTypeBadgeLabel(likedItem.like.entityType) }}</div>

              @if (getItemImage(likedItem)) {
                <img
                  [src]="getItemImage(likedItem)"
                  [alt]="getItemTitle(likedItem)"
                  class="item-image"
                >
              } @else {
                <div class="item-image placeholder">{{ getTypePlaceholderEmoji(likedItem.like.entityType) }}</div>
              }

              <div class="item-info">
                <h3>{{ getItemTitle(likedItem) }}</h3>
                <p class="item-subtitle">{{ getItemSubtitle(likedItem) }}</p>
                <p class="liked-date">Liked: {{ formatDate(likedItem.like.createdAt) }}</p>

                <app-like-button
                  [entityType]="likedItem.like.entityType"
                  [entityId]="likedItem.like.entityId"
                ></app-like-button>

                <a
                  [routerLink]="getItemLink(likedItem)"
                  class="view-link"
                >
                  View Details →
                </a>
              </div>
            </div>
          }
        </div>

        <app-pagination
          [currentPage]="currentPage()"
          [pageSize]="pageSize()"
          [totalItems]="totalFilteredItems()"
          (pageChange)="onPageChange($event)"
          (pageSizeChange)="onPageSizeChange($event)"
        ></app-pagination>
      }
    </div>
  `,
  styles: [`
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 2rem;
    }

    .header-section {
      margin-bottom: 2rem;
    }

    .header-section h2 {
      color: var(--witch-purple);
      font-size: 2.5rem;
      margin-bottom: 0.5rem;
    }

    .subtitle {
      color: var(--witch-plum);
      font-size: 1.1rem;
      margin: 0;
    }

    .not-authenticated, .loading, .empty-state {
      background: var(--witch-lavender);
      padding: 3rem;
      text-align: center;
      border-radius: 12px;
      margin: 2rem 0;
    }

    .empty-state .hint {
      color: var(--witch-plum);
      margin-top: 1rem;
    }

    .filters {
      display: flex;
      flex-wrap: wrap;
      gap: 0.5rem;
      margin-bottom: 2rem;
      padding-bottom: 1rem;
      border-bottom: 2px solid var(--witch-plum);
    }

    .filter-btn {
      padding: 0.5rem 1rem;
      border: 2px solid var(--witch-plum);
      background: transparent;
      color: var(--witch-purple);
      border-radius: 20px;
      cursor: pointer;
      transition: all 0.3s ease;
    }

    .filter-btn:hover {
      background: var(--witch-lavender);
    }

    .filter-btn.active {
      background: var(--witch-rose);
      color: white;
      border-color: var(--witch-rose);
    }

    .liked-items-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
      gap: 2rem;
      margin: 2rem 0;
    }

    .liked-item-card {
      background: white;
      border: 2px solid var(--witch-plum);
      border-radius: 12px;
      overflow: hidden;
      transition: all 0.3s ease;
      position: relative;
    }

    .liked-item-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 8px 16px var(--witch-shadow);
    }

    .item-type-badge {
      position: absolute;
      top: 10px;
      right: 10px;
      background: var(--witch-rose);
      color: white;
      padding: 0.25rem 0.75rem;
      border-radius: 20px;
      font-size: 0.85rem;
      text-transform: capitalize;
      z-index: 1;
    }

    .item-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }

    .item-image.placeholder {
      display: flex;
      align-items: center;
      justify-content: center;
      background: var(--witch-lavender);
      font-size: 4rem;
    }

    .item-info {
      padding: 1.5rem;
    }

    .item-info h3 {
      color: var(--witch-purple);
      margin-bottom: 0.5rem;
      font-size: 1.3rem;
    }

    .item-subtitle {
      color: var(--witch-plum);
      margin-bottom: 0.5rem;
    }

    .liked-date {
      color: var(--witch-silver);
      font-size: 0.9rem;
      margin-bottom: 1rem;
    }

    .view-link {
      display: inline-block;
      margin-top: 1rem;
      color: var(--witch-rose);
      text-decoration: none;
      font-weight: 600;
      transition: all 0.3s ease;
    }

    .view-link:hover {
      color: var(--witch-plum);
      transform: translateX(4px);
    }

    @media (max-width: 768px) {
      .liked-items-grid {
        grid-template-columns: 1fr;
      }
    }
  `]
})
export class MyLikesComponent implements OnInit {
  private likesService = inject(LikesService);
  authService = inject(AuthService);

  loading = signal(false);
  likedItems = signal<LikedItemDto[]>([]);
  typeFilter = signal<'all' | Like['entityType']>('all');
  currentPage = signal(1);
  pageSize = signal(12);

  // Computed signals for filtering and pagination
  filteredItems = computed(() => {
    const filter = this.typeFilter();
    const items = this.likedItems();

    if (filter === 'all') {
      return items;
    }

    return items.filter(item => item.like.entityType === filter);
  });

  totalFilteredItems = computed(() => this.filteredItems().length);

  paginatedItems = computed(() => {
    const items = this.filteredItems();
    const page = this.currentPage();
    const size = this.pageSize();
    const start = (page - 1) * size;
    const end = start + size;

    return items.slice(start, end);
  });

  // Computed counts for each type
  bookCount = computed(() => this.likedItems().filter(item => item.like.entityType === 'book').length);
  gameCount = computed(() => this.likedItems().filter(item => item.like.entityType === 'game').length);
  showCount = computed(() => this.likedItems().filter(item => item.like.entityType === 'show').length);
  mangaCount = computed(() => this.likedItems().filter(item => item.like.entityType === 'manga').length);
  musicCount = computed(() => this.likedItems().filter(item => item.like.entityType === 'music').length);
  artCount = computed(() => this.likedItems().filter(item => item.like.entityType === 'art').length);

  ngOnInit() {
    if (this.authService.isAuthenticated()) {
      this.loadLikedItems();
    }
  }

  loadLikedItems() {
    this.loading.set(true);
    this.likesService.getUserLikedItems().subscribe({
      next: (items) => {
        this.likedItems.set(items);
        this.loading.set(false);
      },
      error: () => {
        this.loading.set(false);
      }
    });
  }

  setFilter(filter: 'all' | Like['entityType']) {
    this.typeFilter.set(filter);
    this.currentPage.set(1); // Reset to first page when filtering
  }

  onPageChange(page: number) {
    this.currentPage.set(page);
  }

  onPageSizeChange(size: number) {
    this.pageSize.set(size);
    this.currentPage.set(1); // Reset to first page when changing page size
  }

  getItemTitle(likedItem: LikedItemDto): string {
    const item = likedItem.item;
    return item.title || item.name || 'Untitled';
  }

  getItemSubtitle(likedItem: LikedItemDto): string {
    const item = likedItem.item;
    const type = likedItem.like.entityType;

    switch (type) {
      case 'book':
        return `by ${item.author || 'Unknown author'}`;
      case 'game':
        return item.platform || 'Platform not specified';
      case 'show':
        return item.type === 'movie' ? 'Movie' : 'TV Show';
      case 'manga':
        return item.volumeCount ? `${item.volumeCount} volumes` : 'Ongoing';
      case 'music':
        return `${item.artist || 'Unknown artist'} - ${item.type || 'Album'}`;
      case 'art':
        return `by ${item.artist || 'Unknown artist'}`;
      default:
        return '';
    }
  }

  getItemImage(likedItem: LikedItemDto): string | null {
    const item = likedItem.item;
    return item.coverImage || item.imageUrl || null;
  }

  getItemLink(likedItem: LikedItemDto): string[] {
    const type = likedItem.like.entityType;
    const id = likedItem.like.entityId;

    switch (type) {
      case 'book':
        return ['/books'];
      case 'game':
        return ['/games'];
      case 'show':
        return ['/shows'];
      case 'manga':
        return ['/manga'];
      case 'music':
        return ['/music'];
      case 'art':
        return ['/art'];
      default:
        return ['/'];
    }
  }

  getTypeBadgeLabel(type: Like['entityType']): string {
    return type.charAt(0).toUpperCase() + type.slice(1);
  }

  getTypePlaceholderEmoji(type: Like['entityType']): string {
    switch (type) {
      case 'book':
        return '📚';
      case 'game':
        return '🎮';
      case 'show':
        return '🎬';
      case 'manga':
        return '📖';
      case 'music':
        return '🎵';
      case 'art':
        return '🎨';
      default:
        return '❤️';
    }
  }

  formatDate(date: Date | string): string {
    const d = new Date(date);
    return d.toLocaleDateString('en-GB', {
      day: 'numeric',
      month: 'short',
      year: 'numeric'
    });
  }
}