import { Component, inject, signal, OnInit } from '@angular/core';
import { CommonModule, DatePipe } from '@angular/common';
import { ActivatedRoute, Router, RouterLink } from '@angular/router';
import { NzCardModule } from 'ng-zorro-antd/card';
import { NzButtonModule } from 'ng-zorro-antd/button';
import { NzIconModule } from 'ng-zorro-antd/icon';
import { NzTagModule } from 'ng-zorro-antd/tag';
import { NzSpinModule } from 'ng-zorro-antd/spin';
import { NzPopconfirmModule } from 'ng-zorro-antd/popconfirm';
import { NzToolTipModule } from 'ng-zorro-antd/tooltip';
import { ApiService } from '../../../core/services/api.service';
import { AuthService } from '../../../core/services/auth.service';
import { NotificationService } from '../../../core/services/notification.service';
import { SettingsService } from '../../../core/services/settings.service';
import { ChannelCacheService, ResolvedChannel } from '../../../core/services/channel-cache.service';
import { UserCacheService, ResolvedUser } from '../../../core/services/user-cache.service';
import { Subscription } from '../../../core/models';
import { RelativeTimePipe } from '../../../shared/pipes/relative-time.pipe';
import { MetadataGridComponent, MetadataValueComponent } from '../../../shared/components/metadata-grid';

@Component({
  selector: 'app-subscription-detail',
  standalone: true,
  imports: [
    CommonModule,
    DatePipe,
    RouterLink,
    NzCardModule,
    NzButtonModule,
    NzIconModule,
    NzTagModule,
    NzSpinModule,
    NzPopconfirmModule,
    NzToolTipModule,
    RelativeTimePipe,
    MetadataGridComponent,
    MetadataValueComponent,
  ],
  templateUrl: './subscription-detail.component.html',
  styleUrl: './subscription-detail.component.scss'
})
export class SubscriptionDetailComponent implements OnInit {
  private route = inject(ActivatedRoute);
  private router = inject(Router);
  private apiService = inject(ApiService);
  private authService = inject(AuthService);
  private notification = inject(NotificationService);
  private settingsService = inject(SettingsService);
  private channelCacheService = inject(ChannelCacheService);
  private userCacheService = inject(UserCacheService);

  subscription = signal<Subscription | null>(null);
  loading = signal(true);
  resolvedChannel = signal<ResolvedChannel | null>(null);
  resolvedSubscriber = signal<ResolvedUser | null>(null);
  resolvedOwner = signal<ResolvedUser | null>(null);
  expertMode = this.settingsService.expertMode;

  ngOnInit(): void {
    const subscriptionId = this.route.snapshot.paramMap.get('id');
    if (subscriptionId) {
      this.loadSubscription(subscriptionId);
    }
  }

  loadSubscription(subscriptionId: string): void {
    const userId = this.authService.getUserId();
    if (!userId) return;

    this.loading.set(true);
    this.apiService.getSubscription(userId, subscriptionId).subscribe({
      next: (subscription) => {
        this.subscription.set(subscription);
        this.loading.set(false);
        this.resolveChannel(subscription.channel_id);
        this.resolveSubscriber(subscription.subscriber_user_id);
        this.resolveOwner(subscription.channel_owner_user_id);
      },
      error: () => {
        this.loading.set(false);
      }
    });
  }

  private resolveChannel(channelId: string): void {
    this.channelCacheService.resolveChannel(channelId).subscribe(resolved => {
      this.resolvedChannel.set(resolved);
    });
  }

  private resolveSubscriber(userId: string): void {
    this.userCacheService.resolveUser(userId).subscribe(resolved => {
      this.resolvedSubscriber.set(resolved);
    });
  }

  private resolveOwner(userId: string): void {
    this.userCacheService.resolveUser(userId).subscribe(resolved => {
      this.resolvedOwner.set(resolved);
    });
  }

  goBack(): void {
    this.router.navigate(['/subscriptions']);
  }

  isOutgoing(): boolean {
    const sub = this.subscription();
    if (!sub) return false;
    const userId = this.authService.getUserId();
    return sub.subscriber_user_id === userId;
  }

  isOwner(): boolean {
    const sub = this.subscription();
    if (!sub) return false;
    const userId = this.authService.getUserId();
    return sub.channel_owner_user_id === userId;
  }

  isOwnSubscription(): boolean {
    const sub = this.subscription();
    if (!sub) return false;
    const userId = this.authService.getUserId();
    return sub.subscriber_user_id === userId && sub.channel_owner_user_id === userId;
  }

  getStatusInfo(): { label: string; color: string } {
    const sub = this.subscription();
    if (!sub) return { label: 'Unknown', color: 'default' };
    if (sub.confirmed) {
      return { label: 'Confirmed', color: 'green' };
    }
    return { label: 'Pending', color: 'orange' };
  }

  getTypeLabel(): { label: string; color: string } {
    const sub = this.subscription();
    if (!sub) return { label: 'Unknown', color: 'default' };
    const userId = this.authService.getUserId();
    if (sub.subscriber_user_id === sub.channel_owner_user_id) {
      return { label: 'Own', color: 'green' };
    }
    if (sub.subscriber_user_id === userId) {
      return { label: 'External', color: 'blue' };
    }
    return { label: 'Incoming', color: 'purple' };
  }

  acceptSubscription(): void {
    const sub = this.subscription();
    const userId = this.authService.getUserId();
    if (!sub || !userId) return;

    this.apiService.confirmSubscription(userId, sub.subscription_id, { confirmed: true }).subscribe({
      next: (updated) => {
        this.subscription.set(updated);
        this.notification.success('Subscription accepted');
      }
    });
  }

  activateSubscription(): void {
    const sub = this.subscription();
    const userId = this.authService.getUserId();
    if (!sub || !userId) return;

    this.apiService.confirmSubscription(userId, sub.subscription_id, { active: true }).subscribe({
      next: (updated) => {
        this.subscription.set(updated);
        this.notification.success('Subscription activated');
      }
    });
  }

  deactivateSubscription(): void {
    const sub = this.subscription();
    const userId = this.authService.getUserId();
    if (!sub || !userId) return;

    this.apiService.confirmSubscription(userId, sub.subscription_id, { confirmed: false }).subscribe({
      next: (updated) => {
        this.subscription.set(updated);
        this.notification.success('Subscription deactivated');
      }
    });
  }

  setInactive(): void {
    const sub = this.subscription();
    const userId = this.authService.getUserId();
    if (!sub || !userId) return;

    this.apiService.confirmSubscription(userId, sub.subscription_id, { active: false }).subscribe({
      next: (updated) => {
        this.subscription.set(updated);
        this.notification.success('Subscription set to inactive');
      }
    });
  }

  deleteSubscription(): void {
    const sub = this.subscription();
    const userId = this.authService.getUserId();
    if (!sub || !userId) return;

    this.apiService.deleteSubscription(userId, sub.subscription_id).subscribe({
      next: () => {
        this.notification.success('Subscription deleted');
        this.router.navigate(['/subscriptions']);
      }
    });
  }
}