import * as plugins from '../plugins.js';
import * as shared from './shared/index.js';
import * as appstate from '../appstate.js';

import {
  DeesElement,
  customElement,
  html,
  state,
  css,
  cssManager,
} from '@design.estate/dees-element';

@customElement('ops-view-stats')
export class OpsViewStats extends DeesElement {
  @state()
  private statsState: appstate.IStatsState = {
    serverStats: null,
    emailStats: null,
    dnsStats: null,
    securityMetrics: null,
    lastUpdated: 0,
    isLoading: false,
    error: null,
  };

  @state()
  private uiState: appstate.IUiState = {
    activeView: 'dashboard',
    sidebarCollapsed: false,
    autoRefresh: true,
    refreshInterval: 30000,
    theme: 'light',
  };

  constructor() {
    super();
    const statsSubscription = appstate.statsStatePart
      .select((stateArg) => stateArg)
      .subscribe((statsState) => {
        this.statsState = statsState;
      });
    this.rxSubscriptions.push(statsSubscription);

    const uiSubscription = appstate.uiStatePart
      .select((stateArg) => stateArg)
      .subscribe((uiState) => {
        this.uiState = uiState;
      });
    this.rxSubscriptions.push(uiSubscription);
  }

  public static styles = [
    cssManager.defaultStyles,
    shared.viewHostCss,
    css`
      .controls {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 24px;
        padding: 16px;
        background: #f8f9fa;
        border-radius: 8px;
      }

      .refreshButton {
        display: flex;
        align-items: center;
        gap: 8px;
      }

      .lastUpdated {
        font-size: 14px;
        color: #666;
      }

      .statsSection {
        margin-bottom: 48px;
      }

      .sectionTitle {
        font-size: 24px;
        font-weight: 600;
        margin-bottom: 24px;
        color: #333;
      }

      .metricsGrid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 16px;
      }

      .metricCard {
        background: white;
        border: 1px solid #e9ecef;
        border-radius: 8px;
        padding: 20px;
        transition: all 0.2s ease;
      }

      .metricCard:hover {
        box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        transform: translateY(-2px);
      }

      .metricLabel {
        font-size: 14px;
        color: #666;
        margin-bottom: 8px;
      }

      .metricValue {
        font-size: 28px;
        font-weight: 700;
        color: #2196F3;
      }

      .metricUnit {
        font-size: 16px;
        color: #999;
        margin-left: 4px;
      }

      .chartContainer {
        background: white;
        border: 1px solid #e9ecef;
        border-radius: 8px;
        padding: 24px;
        margin-top: 24px;
      }
    `,
  ];

  public render() {
    return html`
      <ops-sectionheading>Statistics</ops-sectionheading>
      
      <div class="controls">
        <div class="refreshButton">
          <dees-button 
            @click=${() => appstate.statsStatePart.dispatchAction(appstate.fetchAllStatsAction, null)}
            .disabled=${this.statsState.isLoading}
          >
            ${this.statsState.isLoading ? html`<dees-spinner size="small"></dees-spinner>` : 'Refresh'}
          </dees-button>
          <dees-button 
            @click=${() => appstate.uiStatePart.dispatchAction(appstate.toggleAutoRefreshAction, null)}
            .type=${this.uiState.autoRefresh ? 'highlighted' : 'normal'}
          >
            Auto-refresh: ${this.uiState.autoRefresh ? 'ON' : 'OFF'}
          </dees-button>
        </div>
        <div class="lastUpdated">
          ${this.statsState.lastUpdated ? html`
            Last updated: ${new Date(this.statsState.lastUpdated).toLocaleTimeString()}
          ` : ''}
        </div>
      </div>

      ${this.statsState.serverStats ? html`
        <div class="statsSection">
          <h2 class="sectionTitle">Server Metrics</h2>
          <div class="metricsGrid">
            <div class="metricCard">
              <div class="metricLabel">Uptime</div>
              <div class="metricValue">${this.formatUptime(this.statsState.serverStats.uptime)}</div>
            </div>
            <div class="metricCard">
              <div class="metricLabel">CPU Usage</div>
              <div class="metricValue">${Math.round((this.statsState.serverStats.cpuUsage.user + this.statsState.serverStats.cpuUsage.system) / 2)}<span class="metricUnit">%</span></div>
            </div>
            <div class="metricCard">
              <div class="metricLabel">Memory Used</div>
              <div class="metricValue">${this.formatBytes(this.statsState.serverStats.memoryUsage.heapUsed)}</div>
            </div>
            <div class="metricCard">
              <div class="metricLabel">Active Connections</div>
              <div class="metricValue">${this.statsState.serverStats.activeConnections}</div>
            </div>
          </div>
          
          <div class="chartContainer">
            <dees-chart-area 
              .label=${'Server Performance (Last 24 Hours)'}
              .data=${[]}
            ></dees-chart-area>
          </div>
        </div>
      ` : ''}

      ${this.statsState.emailStats ? html`
        <div class="statsSection">
          <h2 class="sectionTitle">Email Statistics</h2>
          <dees-table
            .heading1=${'Email Metrics'}
            .heading2=${'Current statistics for email processing'}
            .data=${[
              { metric: 'Total Sent', value: this.statsState.emailStats.sent, unit: 'emails' },
              { metric: 'Total Received', value: this.statsState.emailStats.received, unit: 'emails' },
              { metric: 'Failed Deliveries', value: this.statsState.emailStats.failed, unit: 'emails' },
              { metric: 'Currently Queued', value: this.statsState.emailStats.queued, unit: 'emails' },
              { metric: 'Average Delivery Time', value: this.statsState.emailStats.averageDeliveryTime, unit: 'ms' },
              { metric: 'Delivery Rate', value: `${Math.round(this.statsState.emailStats.deliveryRate * 100)}`, unit: '%' },
            ]}
            .displayFunction=${(item) => ({
              Metric: item.metric,
              Value: `${item.value} ${item.unit}`,
            })}
          ></dees-table>
        </div>
      ` : ''}

      ${this.statsState.dnsStats ? html`
        <div class="statsSection">
          <h2 class="sectionTitle">DNS Statistics</h2>
          <div class="metricsGrid">
            <div class="metricCard">
              <div class="metricLabel">Total Queries</div>
              <div class="metricValue">${this.formatNumber(this.statsState.dnsStats.totalQueries)}</div>
            </div>
            <div class="metricCard">
              <div class="metricLabel">Cache Hit Rate</div>
              <div class="metricValue">${Math.round(this.statsState.dnsStats.cacheHitRate * 100)}<span class="metricUnit">%</span></div>
            </div>
            <div class="metricCard">
              <div class="metricLabel">Average Response Time</div>
              <div class="metricValue">${this.statsState.dnsStats.averageResponseTime}<span class="metricUnit">ms</span></div>
            </div>
            <div class="metricCard">
              <div class="metricLabel">Domains Configured</div>
              <div class="metricValue">${this.statsState.dnsStats.activeDomains}</div>
            </div>
          </div>
        </div>
      ` : ''}

      ${this.statsState.securityMetrics ? html`
        <div class="statsSection">
          <h2 class="sectionTitle">Security Metrics</h2>
          <dees-table
            .heading1=${'Security Events'}
            .heading2=${'Recent security-related activities'}
            .data=${[
              { metric: 'Blocked IPs', value: this.statsState.securityMetrics.blockedIPs.length, severity: 'high' },
              { metric: 'Failed Authentications', value: this.statsState.securityMetrics.authenticationFailures, severity: 'medium' },
              { metric: 'Spam Detected', value: this.statsState.securityMetrics.spamDetected, severity: 'low' },
              { metric: 'Spam Detected', value: this.statsState.securityMetrics.spamDetected, severity: 'medium' },
              { metric: 'Malware Detected', value: this.statsState.securityMetrics.malwareDetected, severity: 'high' },
              { metric: 'Phishing Detected', value: this.statsState.securityMetrics.phishingDetected, severity: 'high' },
            ]}
            .displayFunction=${(item) => ({
              'Security Metric': item.metric,
              'Count': item.value,
              'Severity': item.severity,
            })}
          ></dees-table>
        </div>
      ` : ''}
    `;
  }

  private formatUptime(seconds: number): string {
    const days = Math.floor(seconds / 86400);
    const hours = Math.floor((seconds % 86400) / 3600);
    const minutes = Math.floor((seconds % 3600) / 60);
    
    if (days > 0) {
      return `${days}d ${hours}h`;
    } else if (hours > 0) {
      return `${hours}h ${minutes}m`;
    } else {
      return `${minutes}m`;
    }
  }

  private formatBytes(bytes: number): string {
    const units = ['B', 'KB', 'MB', 'GB', 'TB'];
    let size = bytes;
    let unitIndex = 0;
    
    while (size >= 1024 && unitIndex < units.length - 1) {
      size /= 1024;
      unitIndex++;
    }
    
    return `${size.toFixed(1)} ${units[unitIndex]}`;
  }

  private formatNumber(num: number): string {
    if (num >= 1000000) {
      return `${(num / 1000000).toFixed(1)}M`;
    } else if (num >= 1000) {
      return `${(num / 1000).toFixed(1)}K`;
    }
    return num.toString();
  }
}