/**
 * ds-activity-log.js
 * Activity log showing recent MCP tool executions and user actions
 *
 * REFACTORED: DSS-compliant version using DSBaseTool + table-template.js
 * - Extends DSBaseTool for Shadow DOM, AbortController, and standardized lifecycle
 * - Uses table-template.js for DSS-compliant table rendering (NO inline events/styles)
 * - Event delegation pattern for all interactions
 * - Logger utility instead of console.*
 *
 * Reference: .knowledge/dss-coding-standards.json
 */

import DSBaseTool from '../base/ds-base-tool.js';
import toolBridge from '../../services/tool-bridge.js';
import { ComponentHelpers } from '../../utils/component-helpers.js';
import { logger } from '../../utils/logger.js';
import { createTableView, setupTableEvents, createStatsCard } from '../../templates/table-template.js';

class DSActivityLog extends DSBaseTool {
  constructor() {
    super();
    this.activities = [];
    this.maxActivities = 100;
    this.autoRefresh = false;
    this.refreshInterval = null;

    // Listen for tool executions
    this.originalExecuteTool = toolBridge.executeTool.bind(toolBridge);
    this.setupToolInterceptor();
  }

  connectedCallback() {
    super.connectedCallback();
    this.loadActivities();
  }

  disconnectedCallback() {
    if (this.refreshInterval) {
      clearInterval(this.refreshInterval);
    }
    super.disconnectedCallback();
  }

  setupToolInterceptor() {
    // Intercept tool executions to log them
    toolBridge.executeTool = async (toolName, params) => {
      const startTime = Date.now();
      const activity = {
        id: Date.now() + Math.random(),
        type: 'tool_execution',
        toolName,
        params,
        timestamp: new Date(),
        status: 'running'
      };

      this.addActivity(activity);

      try {
        const result = await this.originalExecuteTool(toolName, params);
        const duration = Date.now() - startTime;

        activity.status = 'success';
        activity.duration = duration;
        activity.result = result;

        this.updateActivity(activity);
        return result;
      } catch (error) {
        const duration = Date.now() - startTime;

        activity.status = 'error';
        activity.duration = duration;
        activity.error = error.message;

        this.updateActivity(activity);
        throw error;
      }
    };
  }

  addActivity(activity) {
    this.activities.unshift(activity);
    if (this.activities.length > this.maxActivities) {
      this.activities.pop();
    }
    this.saveActivities();
    this.renderActivities();
  }

  updateActivity(activity) {
    const index = this.activities.findIndex(a => a.id === activity.id);
    if (index !== -1) {
      this.activities[index] = activity;
      this.saveActivities();
      this.renderActivities();
    }
  }

  saveActivities() {
    try {
      localStorage.setItem('ds-activity-log', JSON.stringify(this.activities.slice(0, 50)));
    } catch (e) {
      logger.warn('[DSActivityLog] Failed to save activities to localStorage', e);
    }
  }

  loadActivities() {
    try {
      const stored = localStorage.getItem('ds-activity-log');
      if (stored) {
        this.activities = JSON.parse(stored).map(a => ({
          ...a,
          timestamp: new Date(a.timestamp)
        }));
        this.renderActivities();
        logger.debug('[DSActivityLog] Loaded activities from localStorage', { count: this.activities.length });
      }
    } catch (e) {
      logger.warn('[DSActivityLog] Failed to load activities from localStorage', e);
    }
  }

  clearActivities() {
    this.activities = [];
    this.saveActivities();
    this.renderActivities();
    logger.info('[DSActivityLog] Activities cleared');
  }

  /**
   * Render the component (required by DSBaseTool)
   */
  render() {
    this.shadowRoot.innerHTML = `
      <style>
        :host {
          display: block;
          height: 100%;
        }

        .activity-log-container {
          padding: 16px;
          height: 100%;
          display: flex;
          flex-direction: column;
        }

        .log-controls {
          margin-bottom: 16px;
          display: flex;
          gap: 12px;
          align-items: center;
          justify-content: flex-end;
        }

        .auto-refresh-label {
          display: flex;
          align-items: center;
          gap: 6px;
          font-size: 12px;
          color: var(--vscode-foreground);
          cursor: pointer;
        }

        .clear-btn {
          padding: 6px 12px;
          font-size: 11px;
          background: var(--vscode-button-background);
          color: var(--vscode-button-foreground);
          border: none;
          border-radius: 2px;
          cursor: pointer;
          transition: background 0.15s ease;
        }

        .clear-btn:hover {
          background: var(--vscode-button-hoverBackground);
        }

        .content-wrapper {
          flex: 1;
          overflow: auto;
        }

        .loading {
          display: flex;
          flex-direction: column;
          align-items: center;
          justify-content: center;
          padding: 48px;
          color: var(--vscode-descriptionForeground);
        }

        /* Badge styles */
        .badge {
          display: inline-block;
          padding: 2px 6px;
          border-radius: 3px;
          font-size: 10px;
          font-weight: 600;
        }

        .badge-info {
          background: rgba(75, 181, 211, 0.2);
          color: #4bb5d3;
        }

        .badge-running {
          background: rgba(75, 181, 211, 0.2);
          color: #4bb5d3;
        }

        .badge-success {
          background: rgba(137, 209, 133, 0.2);
          color: #89d185;
        }

        .badge-error {
          background: rgba(244, 135, 113, 0.2);
          color: #f48771;
        }

        .code {
          font-family: 'Courier New', monospace;
          word-break: break-all;
        }

        .icon-cell {
          font-size: 16px;
          text-align: center;
        }

        .tool-name {
          font-family: 'Courier New', monospace;
          color: var(--vscode-textLink-foreground);
        }

        .error-box {
          background-color: rgba(244, 135, 113, 0.1);
          padding: 8px;
          border-radius: 2px;
          color: #f48771;
          font-size: 11px;
        }

        .hint {
          margin-top: 12px;
          padding: 8px;
          background-color: var(--vscode-sideBar-background);
          border-radius: 4px;
          font-size: 10px;
          color: var(--vscode-descriptionForeground);
        }
      </style>

      <div class="activity-log-container">
        <!-- Log Controls -->
        <div class="log-controls">
          <label class="auto-refresh-label">
            <input type="checkbox" id="activity-auto-refresh" />
            Live updates
          </label>
          <button
            id="activity-clear-btn"
            data-action="clear"
            class="clear-btn"
            type="button"
            aria-label="Clear activity log">
            🗑️ Clear Log
          </button>
        </div>

        <!-- Content -->
        <div class="content-wrapper" id="activity-content">
          <div class="loading">Loading activities...</div>
        </div>
      </div>
    `;
  }

  /**
   * Setup event listeners (required by DSBaseTool)
   */
  setupEventListeners() {
    // EVENT-002: Event delegation
    this.delegateEvents('.activity-log-container', 'click', (action, e) => {
      if (action === 'clear') {
        this.clearActivities();
      }
    });

    // Auto-refresh toggle
    const autoRefreshToggle = this.$('#activity-auto-refresh');
    if (autoRefreshToggle) {
      this.bindEvent(autoRefreshToggle, 'change', (e) => {
        this.autoRefresh = e.target.checked;
        if (this.autoRefresh) {
          this.refreshInterval = setInterval(() => this.renderActivities(), 1000);
          logger.debug('[DSActivityLog] Auto-refresh enabled');
        } else {
          if (this.refreshInterval) {
            clearInterval(this.refreshInterval);
            this.refreshInterval = null;
            logger.debug('[DSActivityLog] Auto-refresh disabled');
          }
        }
      });
    }
  }

  getActivityIcon(activity) {
    if (activity.status === 'running') return '🔄';
    if (activity.status === 'success') return '✅';
    if (activity.status === 'error') return '❌';
    return '⚪';
  }

  renderActivities() {
    const content = this.$('#activity-content');
    if (!content) return;

    if (this.activities.length === 0) {
      content.innerHTML = '<div class="table-empty"><div class="table-empty-icon">📋</div><div class="table-empty-text">No recent activity</div></div>';
      return;
    }

    // Calculate stats
    const stats = {
      Total: this.activities.length,
      Success: this.activities.filter(a => a.status === 'success').length,
      Failed: this.activities.filter(a => a.status === 'error').length
    };

    const running = this.activities.filter(a => a.status === 'running').length;
    if (running > 0) {
      stats.Running = running;
    }

    // Render stats card
    const statsHtml = createStatsCard(stats);

    // Use table-template.js for DSS-compliant rendering
    const { html: tableHtml, styles: tableStyles } = createTableView({
      columns: [
        { header: '', key: 'icon', width: '40px', align: 'center' },
        { header: 'Status', key: 'status', width: '80px', align: 'left' },
        { header: 'Tool', key: 'toolName', align: 'left' },
        { header: 'Duration', key: 'duration', width: '100px', align: 'left' },
        { header: 'Time', key: 'timestamp', width: '120px', align: 'left' }
      ],
      rows: this.activities,
      renderCell: (col, row) => this.renderCell(col, row),
      renderDetails: (row) => this.renderDetails(row),
      emptyMessage: 'No recent activity',
      emptyIcon: '📋'
    });

    // Adopt table styles
    this.adoptStyles(tableStyles);

    // Render table
    content.innerHTML = statsHtml + tableHtml + '<div class="hint">💡 Click any row to view full activity details</div>';

    // Setup table event handlers
    setupTableEvents(this.shadowRoot);

    logger.debug('[DSActivityLog] Rendered activities', { count: this.activities.length });
  }

  renderCell(col, row) {
    const icon = this.getActivityIcon(row);
    const toolName = row.toolName || 'Unknown';
    const duration = row.duration ? ComponentHelpers.formatDuration(row.duration) : '-';
    const timestamp = ComponentHelpers.formatRelativeTime(row.timestamp);

    switch (col.key) {
      case 'icon':
        return `<span class="icon-cell">${icon}</span>`;

      case 'status':
        return `<span class="badge badge-${row.status}">${this.escapeHtml(row.status)}</span>`;

      case 'toolName':
        return `<span class="tool-name">${this.escapeHtml(toolName)}</span>`;

      case 'duration':
        return `<span style="color: var(--vscode-descriptionForeground);">${duration}</span>`;

      case 'timestamp':
        return `<span style="color: var(--vscode-descriptionForeground);">${timestamp}</span>`;

      default:
        return this.escapeHtml(String(row[col.key] || '-'));
    }
  }

  renderDetails(row) {
    const toolName = row.toolName || 'Unknown';
    const duration = row.duration ? ComponentHelpers.formatDuration(row.duration) : '-';

    return `
      <div style="margin-bottom: 12px;">
        <span class="detail-label">Tool:</span>
        <span class="detail-value code">${this.escapeHtml(toolName)}</span>
      </div>
      <div style="margin-bottom: 12px;">
        <span class="detail-label">Status:</span>
        <span class="badge badge-${row.status}">${this.escapeHtml(row.status)}</span>
      </div>
      <div style="margin-bottom: 12px;">
        <span class="detail-label">Timestamp:</span>
        <span>${ComponentHelpers.formatTimestamp(row.timestamp)}</span>
      </div>
      ${row.duration ? `
        <div style="margin-bottom: 12px;">
          <span class="detail-label">Duration:</span>
          <span>${duration}</span>
        </div>
      ` : ''}
      ${row.params && Object.keys(row.params).length > 0 ? `
        <div style="margin-bottom: 12px;">
          <div class="detail-label" style="display: block; margin-bottom: 4px;">Parameters:</div>
          <pre class="detail-code">${this.escapeHtml(JSON.stringify(row.params, null, 2))}</pre>
        </div>
      ` : ''}
      ${row.error ? `
        <div style="margin-bottom: 12px;">
          <div class="detail-label" style="display: block; margin-bottom: 4px;">Error:</div>
          <div class="error-box">
            ${this.escapeHtml(row.error)}
          </div>
        </div>
      ` : ''}
    `;
  }
}

customElements.define('ds-activity-log', DSActivityLog);

export default DSActivityLog;