import { Component, inject, signal, OnInit, OnDestroy } from '@angular/core';
import { ApiService } from '../../core/services/api.service';
import { ITrafficStats } from '../../core/types/api.types';
import {
  CardComponent,
  CardHeaderComponent,
  CardTitleComponent,
  CardDescriptionComponent,
  CardContentComponent,
} from '../../ui/card/card.component';
import { SkeletonComponent } from '../../ui/skeleton/skeleton.component';

@Component({
  selector: 'app-traffic-card',
  standalone: true,
  host: { class: 'block h-full' },
  imports: [
    CardComponent,
    CardHeaderComponent,
    CardTitleComponent,
    CardDescriptionComponent,
    CardContentComponent,
    SkeletonComponent,
  ],
  template: `
    <ui-card class="h-full">
      <ui-card-header class="flex flex-col space-y-1.5">
        <ui-card-title>Traffic (Last Hour)</ui-card-title>
        <ui-card-description>Request metrics from access logs</ui-card-description>
      </ui-card-header>
      <ui-card-content class="space-y-3">
        @if (loading() && !stats()) {
          <ui-skeleton class="h-4 w-32" />
          <ui-skeleton class="h-4 w-24" />
          <ui-skeleton class="h-4 w-28" />
        } @else if (stats()) {
          <div class="space-y-2">
            <!-- Request count -->
            <div class="flex items-center justify-between">
              <span class="text-sm text-muted-foreground">Requests</span>
              <span class="text-sm font-medium">{{ formatNumber(stats()!.requestCount) }}</span>
            </div>

            <!-- Error rate -->
            <div class="flex items-center justify-between">
              <span class="text-sm text-muted-foreground">Errors</span>
              <span class="text-sm font-medium" [class.text-destructive]="stats()!.errorRate > 5">
                {{ stats()!.errorCount }} ({{ stats()!.errorRate }}%)
              </span>
            </div>

            <!-- Avg response time -->
            <div class="flex items-center justify-between">
              <span class="text-sm text-muted-foreground">Avg Response</span>
              <span class="text-sm font-medium" [class.text-warning]="stats()!.avgResponseTime > 500">
                {{ stats()!.avgResponseTime }}ms
              </span>
            </div>

            <!-- Requests per minute -->
            <div class="flex items-center justify-between">
              <span class="text-sm text-muted-foreground">Req/min</span>
              <span class="text-sm font-medium">{{ stats()!.requestsPerMinute }}</span>
            </div>

            <!-- Status code distribution -->
            <div class="pt-2 border-t">
              <div class="flex gap-1 h-2 rounded overflow-hidden bg-muted">
                @if (getStatusPercent('2xx') > 0) {
                  <div
                    class="bg-success transition-all"
                    [style.width.%]="getStatusPercent('2xx')"
                    [title]="'2xx: ' + stats()!.statusCounts['2xx']">
                  </div>
                }
                @if (getStatusPercent('3xx') > 0) {
                  <div
                    class="bg-blue-500 transition-all"
                    [style.width.%]="getStatusPercent('3xx')"
                    [title]="'3xx: ' + stats()!.statusCounts['3xx']">
                  </div>
                }
                @if (getStatusPercent('4xx') > 0) {
                  <div
                    class="bg-warning transition-all"
                    [style.width.%]="getStatusPercent('4xx')"
                    [title]="'4xx: ' + stats()!.statusCounts['4xx']">
                  </div>
                }
                @if (getStatusPercent('5xx') > 0) {
                  <div
                    class="bg-destructive transition-all"
                    [style.width.%]="getStatusPercent('5xx')"
                    [title]="'5xx: ' + stats()!.statusCounts['5xx']">
                  </div>
                }
              </div>
              <div class="flex justify-between mt-1 text-xs text-muted-foreground">
                <span>2xx</span>
                <span>3xx</span>
                <span>4xx</span>
                <span>5xx</span>
              </div>
            </div>
          </div>
        } @else {
          <div class="text-sm text-muted-foreground">No traffic data available</div>
        }
      </ui-card-content>
    </ui-card>
  `,
})
export class TrafficCardComponent implements OnInit, OnDestroy {
  private api = inject(ApiService);

  stats = signal<ITrafficStats | null>(null);
  loading = signal(false);

  private refreshInterval: any;

  ngOnInit(): void {
    this.loadStats();
    // Refresh every 30 seconds
    this.refreshInterval = setInterval(() => this.loadStats(), 30000);
  }

  ngOnDestroy(): void {
    if (this.refreshInterval) {
      clearInterval(this.refreshInterval);
    }
  }

  async loadStats(): Promise<void> {
    this.loading.set(true);
    try {
      const response = await this.api.getTrafficStats(60);
      if (response.success && response.data) {
        this.stats.set(response.data);
      }
    } catch (err) {
      console.error('Failed to load traffic stats:', err);
    } finally {
      this.loading.set(false);
    }
  }

  formatNumber(num: number): string {
    if (num >= 1000000) {
      return (num / 1000000).toFixed(1) + 'M';
    }
    if (num >= 1000) {
      return (num / 1000).toFixed(1) + 'K';
    }
    return num.toString();
  }

  getStatusPercent(status: string): number {
    const s = this.stats();
    if (!s || s.requestCount === 0) return 0;
    const count = s.statusCounts[status] || 0;
    return (count / s.requestCount) * 100;
  }
}