import { Component, inject, signal, OnInit, computed, effect } 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 { NzTableModule } from 'ng-zorro-antd/table';
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 { KeyCacheService, ResolvedKey } from '../../../core/services/key-cache.service';
import { UserCacheService, ResolvedUser } from '../../../core/services/user-cache.service';
import { Message, Delivery } from '../../../core/models';
import { RelativeTimePipe } from '../../../shared/pipes/relative-time.pipe';
import { MetadataGridComponent, MetadataValueComponent } from '../../../shared/components/metadata-grid';

@Component({
  selector: 'app-message-detail',
  standalone: true,
  imports: [
    CommonModule,
    DatePipe,
    NzCardModule,
    NzButtonModule,
    NzIconModule,
    NzTagModule,
    NzSpinModule,
    NzPopconfirmModule,
    NzTableModule,
    RouterLink,
    RelativeTimePipe,
    MetadataGridComponent,
    MetadataValueComponent,
  ],
  templateUrl: './message-detail.component.html',
  styleUrl: './message-detail.component.scss'
})
export class MessageDetailComponent 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 keyCacheService = inject(KeyCacheService);
  private userCacheService = inject(UserCacheService);

  message = signal<Message | null>(null);
  resolvedKey = signal<ResolvedKey | null>(null);
  resolvedChannelOwner = signal<ResolvedUser | null>(null);
  deliveries = signal<Delivery[]>([]);
  loading = signal(true);
  deleting = signal(false);
  loadingDeliveries = signal(false);
  expertMode = this.settingsService.expertMode;

  isChannelOwner = computed(() => {
    const msg = this.message();
    const userId = this.authService.getUserId();
    return msg !== null && userId !== null && msg.channel_owner_user_id === userId;
  });

  showDeliveries = computed(() => this.expertMode() && this.isChannelOwner());

  constructor() {
    // Watch for expert mode changes and load deliveries when it becomes visible
    effect(() => {
      if (this.showDeliveries() && this.message() && this.deliveries().length === 0 && !this.loadingDeliveries()) {
        this.loadDeliveries(this.message()!.message_id);
      }
    });
  }

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

  loadMessage(messageId: string): void {
    this.loading.set(true);
    this.apiService.getMessage(messageId).subscribe({
      next: (message) => {
        this.message.set(message);
        this.loading.set(false);
        this.resolveKey(message.used_key_id);
        this.resolveChannelOwner(message.channel_owner_user_id);
        this.loadDeliveries(messageId);
      },
      error: () => {
        this.loading.set(false);
      }
    });
  }

  private loadDeliveries(messageId: string): void {
    if (!this.showDeliveries()) {
      return;
    }
    this.loadingDeliveries.set(true);
    this.apiService.getDeliveries(messageId).subscribe({
      next: (response) => {
        this.deliveries.set(response.deliveries);
        this.loadingDeliveries.set(false);
      },
      error: () => {
        this.loadingDeliveries.set(false);
      }
    });
  }

  private resolveKey(keyId: string): void {
    this.keyCacheService.resolveKey(keyId).subscribe({
      next: (resolved) => this.resolvedKey.set(resolved)
    });
  }

  private resolveChannelOwner(userId: string): void {
    this.userCacheService.resolveUser(userId).subscribe({
      next: (resolved) => this.resolvedChannelOwner.set(resolved)
    });
  }

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

  deleteMessage(): void {
    const message = this.message();
    if (!message) return;

    this.deleting.set(true);
    this.apiService.deleteMessage(message.message_id).subscribe({
      next: () => {
        this.notification.success('Message deleted');
        this.router.navigate(['/messages']);
      },
      error: () => {
        this.deleting.set(false);
      }
    });
  }

  getPriorityLabel(priority: number): string {
    switch (priority) {
      case 0: return 'Low';
      case 1: return 'Normal';
      case 2: return 'High';
      default: return 'Unknown';
    }
  }

  getPriorityColor(priority: number): string {
    switch (priority) {
      case 0: return 'default';
      case 1: return 'blue';
      case 2: return 'red';
      default: return 'default';
    }
  }

  getStatusColor(status: string): string {
    switch (status) {
      case 'SUCCESS': return 'green';
      case 'FAILED': return 'red';
      case 'RETRY': return 'orange';
      default: return 'default';
    }
  }
}