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

import { Component, OnInit, inject, signal } from '@angular/core';
import { CommonModule } from '@angular/common';
import {
  AchievementCategory,
  AchievementProgress,
  AchievementTier,
} from '@library/shared-types';
import { AchievementService } from '../../services/achievement.service';

@Component({
  selector: 'app-achievements',
  standalone: true,
  imports: [CommonModule],
  template: `
    <div class="achievements-container">
      <div class="achievements-header">
        <h1>🏆 Achievements</h1>
        <p class="subtitle">Track your progress across all achievement categories</p>

        @if (totalPoints() > 0) {
          <div class="total-points">
            <span class="points-label">Total Points:</span>
            <span class="points-value">{{ totalPoints() }}</span>
          </div>
        }
      </div>

      <div class="filter-buttons">
        <button
          [class.active]="selectedCategory() === null"
          (click)="selectCategory(null)">
          All ({{ totalEarned() }}/{{ totalAchievements() }})
        </button>
        <button
          [class.active]="selectedCategory() === AchievementCategory.Suggestion"
          (click)="selectCategory(AchievementCategory.Suggestion)">
          📝 Suggestions ({{ getCategoryCount(AchievementCategory.Suggestion) }})
        </button>
        <button
          [class.active]="selectedCategory() === AchievementCategory.Like"
          (click)="selectCategory(AchievementCategory.Like)">
          ❤️ Likes ({{ getCategoryCount(AchievementCategory.Like) }})
        </button>
        <button
          [class.active]="selectedCategory() === AchievementCategory.Comment"
          (click)="selectCategory(AchievementCategory.Comment)">
          💬 Comments ({{ getCategoryCount(AchievementCategory.Comment) }})
        </button>
        <button
          [class.active]="selectedCategory() === AchievementCategory.Engagement"
          (click)="selectCategory(AchievementCategory.Engagement)">
          🎯 Engagement ({{ getCategoryCount(AchievementCategory.Engagement) }})
        </button>
        <button
          [class.active]="selectedCategory() === AchievementCategory.Report"
          (click)="selectCategory(AchievementCategory.Report)">
          🛡️ Reports ({{ getCategoryCount(AchievementCategory.Report) }})
        </button>
      </div>

      @if (loading()) {
        <div class="loading">Loading achievements...</div>
      } @else if (error()) {
        <div class="error">{{ error() }}</div>
      } @else {
        <div class="achievements-grid">
          @for (achievement of filteredAchievements(); track achievement.definition.key) {
            <div
              class="achievement-card"
              [class.earned]="achievement.earned"
              [class.locked]="!achievement.earned"
              [attr.data-tier]="achievement.definition.tier.toLowerCase()">

              <div class="achievement-icon">
                {{ achievement.definition.icon }}
              </div>

              <div class="achievement-content">
                <h3 class="achievement-title">
                  {{ achievement.definition.title }}
                  @if (achievement.earned) {
                    <span class="earned-check">✓</span>
                  }
                </h3>

                <p class="achievement-description">
                  {{ achievement.definition.description }}
                </p>

                <div class="achievement-footer">
                  <span class="achievement-tier" [attr.data-tier]="achievement.definition.tier.toLowerCase()">
                    {{ getTierLabel(achievement.definition.tier) }}
                  </span>
                  <span class="achievement-points">{{ achievement.definition.points }} pts</span>
                </div>

                @if (!achievement.earned && achievement.progress > 0) {
                  <div class="progress-bar">
                    <div class="progress-fill" [style.width.%]="achievement.progress"></div>
                  </div>
                  <div class="progress-text">{{ achievement.progress }}% complete</div>
                }

                @if (achievement.earned && achievement.earnedAt) {
                  <div class="earned-date">
                    Earned {{ formatDate(achievement.earnedAt) }}
                  </div>
                }
              </div>
            </div>
          }
        </div>
      }
    </div>
  `,
  styles: [`
    .achievements-container {
      max-width: 1400px;
      margin: 0 auto;
      padding: 2rem;
    }

    .achievements-header {
      text-align: center;
      margin-bottom: 2rem;
    }

    .achievements-header h1 {
      font-size: 2.5rem;
      margin-bottom: 0.5rem;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .subtitle {
      color: #a0aec0;
      font-size: 1.1rem;
    }

    .total-points {
      margin-top: 1rem;
      padding: 1rem 2rem;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      border-radius: 12px;
      display: inline-block;
      color: white;
      font-size: 1.2rem;
      font-weight: bold;
    }

    .points-label {
      margin-right: 0.5rem;
    }

    .points-value {
      font-size: 1.5rem;
    }

    .filter-buttons {
      display: flex;
      gap: 0.5rem;
      flex-wrap: wrap;
      justify-content: center;
      margin-bottom: 2rem;
    }

    .filter-buttons button {
      padding: 0.75rem 1.5rem;
      background: #2d3748;
      color: #cbd5e0;
      border: 2px solid #4a5568;
      border-radius: 8px;
      cursor: pointer;
      transition: all 0.2s;
      font-size: 1rem;
    }

    .filter-buttons button:hover {
      background: #4a5568;
      border-color: #667eea;
    }

    .filter-buttons button.active {
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      border-color: #667eea;
      color: white;
    }

    .achievements-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
      gap: 1.5rem;
    }

    .achievement-card {
      background: #2d3748;
      border-radius: 12px;
      padding: 1.5rem;
      display: flex;
      gap: 1rem;
      border: 2px solid #4a5568;
      transition: all 0.3s;
    }

    .achievement-card.earned {
      background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
      border-color: #667eea;
    }

    .achievement-card.earned:hover {
      transform: translateY(-4px);
      box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
    }

    .achievement-card.locked {
      opacity: 0.6;
    }

    .achievement-icon {
      font-size: 3rem;
      flex-shrink: 0;
    }

    .achievement-content {
      flex: 1;
    }

    .achievement-title {
      font-size: 1.25rem;
      margin-bottom: 0.5rem;
      color: #e2e8f0;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .earned-check {
      color: #48bb78;
      font-size: 1.5rem;
    }

    .achievement-description {
      color: #a0aec0;
      margin-bottom: 1rem;
      line-height: 1.5;
    }

    .achievement-footer {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 0.5rem;
    }

    .achievement-tier {
      padding: 0.25rem 0.75rem;
      border-radius: 6px;
      font-size: 0.875rem;
      font-weight: 600;
      text-transform: uppercase;
    }

    .achievement-tier[data-tier="bronze"] {
      background: linear-gradient(135deg, #cd7f32 0%, #b87333 100%);
      color: white;
    }

    .achievement-tier[data-tier="silver"] {
      background: linear-gradient(135deg, #c0c0c0 0%, #a8a8a8 100%);
      color: #2d3748;
    }

    .achievement-tier[data-tier="gold"] {
      background: linear-gradient(135deg, #ffd700 0%, #ffed4e 100%);
      color: #2d3748;
    }

    .achievement-tier[data-tier="platinum"] {
      background: linear-gradient(135deg, #e5e4e2 0%, #bdb8af 100%);
      color: #2d3748;
    }

    .achievement-tier[data-tier="diamond"] {
      background: linear-gradient(135deg, #b9f2ff 0%, #7ec8e3 100%);
      color: #2d3748;
    }

    .achievement-points {
      color: #667eea;
      font-weight: 600;
    }

    .progress-bar {
      width: 100%;
      height: 8px;
      background: #4a5568;
      border-radius: 4px;
      overflow: hidden;
      margin: 0.5rem 0;
    }

    .progress-fill {
      height: 100%;
      background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
      transition: width 0.3s;
    }

    .progress-text {
      font-size: 0.875rem;
      color: #a0aec0;
      text-align: right;
    }

    .earned-date {
      font-size: 0.875rem;
      color: #48bb78;
      margin-top: 0.5rem;
    }

    .loading, .error {
      text-align: center;
      padding: 3rem;
      font-size: 1.2rem;
      color: #a0aec0;
    }

    .error {
      color: #fc8181;
    }
  `],
})
export class AchievementsComponent implements OnInit {
  private readonly achievementService = inject(AchievementService);

  achievements = signal<AchievementProgress[]>([]);
  selectedCategory = signal<AchievementCategory | null>(null);
  loading = signal(true);
  error = signal<string | null>(null);

  // Expose AchievementCategory enum for template
  readonly AchievementCategory = AchievementCategory;

  ngOnInit(): void {
    this.loadAchievements();
  }

  private loadAchievements(): void {
    this.achievementService.getCurrentUserProgress().subscribe({
      next: (achievements) => {
        this.achievements.set(achievements);
        this.loading.set(false);
      },
      error: (err) => {
        this.error.set('Failed to load achievements');
        this.loading.set(false);
        console.error('Error loading achievements:', err);
      },
    });
  }

  filteredAchievements(): AchievementProgress[] {
    const category = this.selectedCategory();
    if (!category) {
      return this.achievements();
    }
    return this.achievements().filter(
      (a) => a.definition.category === category,
    );
  }

  selectCategory(category: AchievementCategory | null): void {
    this.selectedCategory.set(category);
  }

  totalAchievements(): number {
    return this.achievements().length;
  }

  totalEarned(): number {
    return this.achievements().filter((a) => a.earned).length;
  }

  totalPoints(): number {
    return this.achievements()
      .filter((a) => a.earned)
      .reduce((sum, a) => sum + a.definition.points, 0);
  }

  getCategoryCount(category: AchievementCategory): string {
    const total = this.achievements().filter(
      (a) => a.definition.category === category,
    ).length;
    const earned = this.achievements().filter(
      (a) => a.definition.category === category && a.earned,
    ).length;
    return `${earned}/${total}`;
  }

  getTierLabel(tier: AchievementTier): string {
    return tier;
  }

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

    if (diffDays === 0) {
      return 'today';
    }
    if (diffDays === 1) {
      return 'yesterday';
    }
    if (diffDays < 7) {
      return `${diffDays} days ago`;
    }
    if (diffDays < 30) {
      const weeks = Math.floor(diffDays / 7);
      return `${weeks} ${weeks === 1 ? 'week' : 'weeks'} ago`;
    }
    if (diffDays < 365) {
      const months = Math.floor(diffDays / 30);
      return `${months} ${months === 1 ? 'month' : 'months'} ago`;
    }
    const years = Math.floor(diffDays / 365);
    return `${years} ${years === 1 ? 'year' : 'years'} ago`;
  }
}