/**
 * ds-metrics-panel.js
 * Universal metrics panel showing tool execution stats and activity
 */

import toolBridge from '../../services/tool-bridge.js';

class DSMetricsPanel extends HTMLElement {
  constructor() {
    super();
    this.metrics = {
      totalExecutions: 0,
      successCount: 0,
      errorCount: 0,
      recentActivity: []
    };
    this.refreshInterval = null;
  }

  connectedCallback() {
    this.render();
    this.startAutoRefresh();
  }

  disconnectedCallback() {
    this.stopAutoRefresh();
  }

  render() {
    const successRate = this.metrics.totalExecutions > 0
      ? Math.round((this.metrics.successCount / this.metrics.totalExecutions) * 100)
      : 0;

    this.innerHTML = `
      <div style="padding: 16px;">
        <div style="display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-bottom: 16px;">
          <!-- Total Executions Card -->
          <div style="
            background-color: var(--vscode-sidebar);
            border: 1px solid var(--vscode-border);
            border-radius: 4px;
            padding: 12px;
          ">
            <div style="font-size: 11px; color: var(--vscode-text-dim); margin-bottom: 4px;">
              TOTAL EXECUTIONS
            </div>
            <div style="font-size: 24px; font-weight: 600;">
              ${this.metrics.totalExecutions}
            </div>
          </div>

          <!-- Success Rate Card -->
          <div style="
            background-color: var(--vscode-sidebar);
            border: 1px solid var(--vscode-border);
            border-radius: 4px;
            padding: 12px;
          ">
            <div style="font-size: 11px; color: var(--vscode-text-dim); margin-bottom: 4px;">
              SUCCESS RATE
            </div>
            <div style="font-size: 24px; font-weight: 600; color: ${successRate >= 80 ? '#4caf50' : successRate >= 50 ? '#ff9800' : '#f44336'};">
              ${successRate}%
            </div>
          </div>

          <!-- Error Count Card -->
          <div style="
            background-color: var(--vscode-sidebar);
            border: 1px solid var(--vscode-border);
            border-radius: 4px;
            padding: 12px;
          ">
            <div style="font-size: 11px; color: var(--vscode-text-dim); margin-bottom: 4px;">
              ERRORS
            </div>
            <div style="font-size: 24px; font-weight: 600; color: ${this.metrics.errorCount > 0 ? '#f44336' : 'inherit'};">
              ${this.metrics.errorCount}
            </div>
          </div>
        </div>

        <!-- Recent Activity -->
        <div>
          <div style="font-size: 11px; color: var(--vscode-text-dim); margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.5px;">
            Recent Activity
          </div>
          <div style="
            background-color: var(--vscode-bg);
            border: 1px solid var(--vscode-border);
            border-radius: 4px;
            max-height: 200px;
            overflow-y: auto;
          ">
            ${this.metrics.recentActivity.length === 0 ? `
              <div style="padding: 16px; text-align: center; color: var(--vscode-text-dim); font-size: 12px;">
                No recent activity
              </div>
            ` : this.metrics.recentActivity.map(activity => `
              <div style="
                padding: 8px 12px;
                border-bottom: 1px solid var(--vscode-border);
                font-size: 12px;
                display: flex;
                justify-content: space-between;
                align-items: center;
              ">
                <div>
                  <span style="color: ${activity.success ? '#4caf50' : '#f44336'};">
                    ${activity.success ? '✓' : '✗'}
                  </span>
                  <span style="margin-left: 8px;">${activity.toolName}</span>
                </div>
                <span style="color: var(--vscode-text-dim); font-size: 11px;">
                  ${activity.timestamp}
                </span>
              </div>
            `).join('')}
          </div>
        </div>
      </div>
    `;
  }

  recordExecution(toolName, success = true) {
    this.metrics.totalExecutions++;
    if (success) {
      this.metrics.successCount++;
    } else {
      this.metrics.errorCount++;
    }

    // Add to recent activity
    const now = new Date();
    const timestamp = now.toLocaleTimeString();

    this.metrics.recentActivity.unshift({
      toolName,
      success,
      timestamp
    });

    // Keep only last 10 activities
    if (this.metrics.recentActivity.length > 10) {
      this.metrics.recentActivity = this.metrics.recentActivity.slice(0, 10);
    }

    this.render();
  }

  startAutoRefresh() {
    // Refresh metrics every 5 seconds
    this.refreshInterval = setInterval(() => {
      this.render();
    }, 5000);
  }

  stopAutoRefresh() {
    if (this.refreshInterval) {
      clearInterval(this.refreshInterval);
      this.refreshInterval = null;
    }
  }

  reset() {
    this.metrics = {
      totalExecutions: 0,
      successCount: 0,
      errorCount: 0,
      recentActivity: []
    };
    this.render();
  }
}

customElements.define('ds-metrics-panel', DSMetricsPanel);

export default DSMetricsPanel;