import { Component, inject, signal, effect, OnDestroy } from '@angular/core';
import { RouterLink } from '@angular/router';
import { WebSocketService } from '../../core/services/websocket.service';
import { IContainerStats } from '../../core/types/api.types';
import {
  CardComponent,
  CardHeaderComponent,
  CardTitleComponent,
  CardDescriptionComponent,
  CardContentComponent,
} from '../../ui/card/card.component';

interface IServiceStats {
  name: string;
  stats: IContainerStats;
  timestamp: number;
}

interface IAggregatedStats {
  totalCpuPercent: number;
  totalMemoryUsed: number;
  totalMemoryLimit: number;
  memoryPercent: number;
  networkRxRate: number;
  networkTxRate: number;
  serviceCount: number;
  topCpuServices: { name: string; value: number }[];
  topMemoryServices: { name: string; value: number }[];
}

@Component({
  selector: 'app-resource-usage-card',
  standalone: true,
  host: { class: 'block' },
  imports: [
    RouterLink,
    CardComponent,
    CardHeaderComponent,
    CardTitleComponent,
    CardDescriptionComponent,
    CardContentComponent,
  ],
  template: `
    <ui-card>
      <ui-card-header class="flex flex-row items-center justify-between space-y-0 pb-2">
        <div>
          <ui-card-title>Resource Usage</ui-card-title>
          <ui-card-description>Aggregated across {{ aggregated().serviceCount }} services</ui-card-description>
        </div>
        <a routerLink="/services" class="text-xs text-muted-foreground hover:text-primary transition-colors">
          View All
        </a>
      </ui-card-header>
      <ui-card-content class="space-y-4">
        @if (aggregated().serviceCount === 0) {
          <div class="text-sm text-muted-foreground">No running services</div>
        } @else {
          <!-- CPU Usage -->
          <div class="space-y-1">
            <div class="flex items-center justify-between text-sm">
              <span class="text-muted-foreground">CPU</span>
              <span class="font-medium" [class.text-warning]="aggregated().totalCpuPercent > 70" [class.text-destructive]="aggregated().totalCpuPercent > 90">
                {{ aggregated().totalCpuPercent.toFixed(1) }}%
              </span>
            </div>
            <div class="h-2 rounded-full bg-muted overflow-hidden">
              <div
                class="h-full transition-all duration-300"
                [class.bg-success]="aggregated().totalCpuPercent <= 70"
                [class.bg-warning]="aggregated().totalCpuPercent > 70 && aggregated().totalCpuPercent <= 90"
                [class.bg-destructive]="aggregated().totalCpuPercent > 90"
                [style.width.%]="Math.min(aggregated().totalCpuPercent, 100)">
              </div>
            </div>
          </div>

          <!-- Memory Usage -->
          <div class="space-y-1">
            <div class="flex items-center justify-between text-sm">
              <span class="text-muted-foreground">Memory</span>
              <span class="font-medium" [class.text-warning]="aggregated().memoryPercent > 70" [class.text-destructive]="aggregated().memoryPercent > 90">
                {{ formatBytes(aggregated().totalMemoryUsed) }} / {{ formatBytes(aggregated().totalMemoryLimit) }}
              </span>
            </div>
            <div class="h-2 rounded-full bg-muted overflow-hidden">
              <div
                class="h-full transition-all duration-300"
                [class.bg-success]="aggregated().memoryPercent <= 70"
                [class.bg-warning]="aggregated().memoryPercent > 70 && aggregated().memoryPercent <= 90"
                [class.bg-destructive]="aggregated().memoryPercent > 90"
                [style.width.%]="Math.min(aggregated().memoryPercent, 100)">
              </div>
            </div>
          </div>

          <!-- Network -->
          <div class="flex items-center justify-between text-sm pt-1 border-t">
            <span class="text-muted-foreground">Network</span>
            <div class="flex items-center gap-3">
              <span class="flex items-center gap-1">
                <svg class="h-3 w-3 text-success" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
                  <path stroke-linecap="round" stroke-linejoin="round" d="M19 14l-7 7m0 0l-7-7m7 7V3" />
                </svg>
                {{ formatBytesRate(aggregated().networkRxRate) }}
              </span>
              <span class="flex items-center gap-1">
                <svg class="h-3 w-3 text-blue-500" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
                  <path stroke-linecap="round" stroke-linejoin="round" d="M5 10l7-7m0 0l7 7m-7-7v18" />
                </svg>
                {{ formatBytesRate(aggregated().networkTxRate) }}
              </span>
            </div>
          </div>

          <!-- Top Consumers -->
          @if (aggregated().topCpuServices.length > 0 || aggregated().topMemoryServices.length > 0) {
            <div class="pt-2 border-t">
              <div class="text-xs text-muted-foreground mb-1">Top consumers</div>
              <div class="flex flex-wrap gap-x-4 gap-y-1 text-xs">
                @for (svc of aggregated().topCpuServices.slice(0, 2); track svc.name) {
                  <span>
                    <span class="text-muted-foreground">{{ svc.name }}:</span>
                    <span class="font-medium"> {{ svc.value.toFixed(1) }}% CPU</span>
                  </span>
                }
                @for (svc of aggregated().topMemoryServices.slice(0, 2); track svc.name) {
                  <span>
                    <span class="text-muted-foreground">{{ svc.name }}:</span>
                    <span class="font-medium"> {{ formatBytes(svc.value) }}</span>
                  </span>
                }
              </div>
            </div>
          }
        }
      </ui-card-content>
    </ui-card>
  `,
})
export class ResourceUsageCardComponent implements OnDestroy {
  private ws = inject(WebSocketService);

  // Store stats per service
  private serviceStats = new Map<string, IServiceStats>();
  private cleanupInterval: any;

  // Expose Math for template
  Math = Math;

  aggregated = signal<IAggregatedStats>({
    totalCpuPercent: 0,
    totalMemoryUsed: 0,
    totalMemoryLimit: 0,
    memoryPercent: 0,
    networkRxRate: 0,
    networkTxRate: 0,
    serviceCount: 0,
    topCpuServices: [],
    topMemoryServices: [],
  });

  constructor() {
    // Listen for stats updates
    effect(() => {
      const update = this.ws.statsUpdate();
      if (update) {
        this.serviceStats.set(update.serviceName, {
          name: update.serviceName,
          stats: update.stats,
          timestamp: update.timestamp,
        });
        this.recalculateAggregated();
      }
    });

    // Clean up stale entries every 30 seconds
    this.cleanupInterval = setInterval(() => {
      const now = Date.now();
      const staleThreshold = 60000; // 60 seconds
      let changed = false;

      for (const [name, entry] of this.serviceStats.entries()) {
        if (now - entry.timestamp > staleThreshold) {
          this.serviceStats.delete(name);
          changed = true;
        }
      }

      if (changed) {
        this.recalculateAggregated();
      }
    }, 30000);
  }

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

  private recalculateAggregated(): void {
    const entries = Array.from(this.serviceStats.values());

    if (entries.length === 0) {
      this.aggregated.set({
        totalCpuPercent: 0,
        totalMemoryUsed: 0,
        totalMemoryLimit: 0,
        memoryPercent: 0,
        networkRxRate: 0,
        networkTxRate: 0,
        serviceCount: 0,
        topCpuServices: [],
        topMemoryServices: [],
      });
      return;
    }

    let totalCpu = 0;
    let totalMemUsed = 0;
    let totalMemLimit = 0;
    let totalNetRx = 0;
    let totalNetTx = 0;

    for (const entry of entries) {
      totalCpu += entry.stats.cpuPercent;
      totalMemUsed += entry.stats.memoryUsed;
      totalMemLimit += entry.stats.memoryLimit;
      totalNetRx += entry.stats.networkRx;
      totalNetTx += entry.stats.networkTx;
    }

    // Sort by CPU usage for top consumers
    const sortedByCpu = [...entries]
      .filter(e => e.stats.cpuPercent > 0)
      .sort((a, b) => b.stats.cpuPercent - a.stats.cpuPercent)
      .slice(0, 3)
      .map(e => ({ name: e.name, value: e.stats.cpuPercent }));

    // Sort by memory usage for top consumers
    const sortedByMem = [...entries]
      .filter(e => e.stats.memoryUsed > 0)
      .sort((a, b) => b.stats.memoryUsed - a.stats.memoryUsed)
      .slice(0, 3)
      .map(e => ({ name: e.name, value: e.stats.memoryUsed }));

    this.aggregated.set({
      totalCpuPercent: totalCpu,
      totalMemoryUsed: totalMemUsed,
      totalMemoryLimit: totalMemLimit,
      memoryPercent: totalMemLimit > 0 ? (totalMemUsed / totalMemLimit) * 100 : 0,
      networkRxRate: totalNetRx,
      networkTxRate: totalNetTx,
      serviceCount: entries.length,
      topCpuServices: sortedByCpu,
      topMemoryServices: sortedByMem,
    });
  }

  formatBytes(bytes: number): string {
    if (bytes === 0) return '0 B';
    const k = 1024;
    const sizes = ['B', 'KB', 'MB', 'GB', 'TB'];
    const i = Math.floor(Math.log(bytes) / Math.log(k));
    return parseFloat((bytes / Math.pow(k, i)).toFixed(1)) + ' ' + sizes[i];
  }

  formatBytesRate(bytes: number): string {
    return this.formatBytes(bytes) + '/s';
  }
}