/**
 * Context Pressure Visualization
 * Tractatus Framework - Phase 3: Data Visualization
 *
 * Visual representation of Context Pressure Monitor metrics
 * Uses amber color scheme matching the ContextPressureMonitor service
 */

class PressureChart {
  constructor(containerId, gaugeContainerId = 'pressure-gauge') {
    this.container = document.getElementById(containerId);
    this.gaugeContainer = document.getElementById(gaugeContainerId);

    if (!this.container) {
      console.error(`[PressureChart] Container #${containerId} not found`);
      return;
    }

    this.currentLevel = 0; // 0-100
    this.targetLevel = 0;
    this.animating = false;

    this.colors = {
      low: '#10b981',      // Green - NORMAL
      moderate: '#f59e0b', // Amber - ELEVATED
      high: '#ef4444',     // Red - HIGH
      critical: '#991b1b'  // Dark Red - CRITICAL
    };

    this.init();
  }

  init() {
    this.render();
    this.attachEventListeners();
    console.log('[PressureChart] Initialized');
  }

  render() {
    console.log('[PressureChart] render() called, container:', this.container);

    this.container.innerHTML = `
      <div class="flex items-center justify-between mb-3">
        <h2 class="text-lg font-semibold text-gray-900">Context Pressure Monitor</h2>
        <div id="pressure-status" class="px-4 py-2 rounded-full text-sm font-bold uppercase bg-green-100 text-green-700 transition-all duration-500">
          NORMAL
        </div>
      </div>

      <div class="flex flex-col sm:flex-row gap-3 mb-4">
        <button id="pressure-simulate-btn" class="flex-1 bg-amber-800 hover:bg-amber-900 text-white px-4 py-3 rounded-lg font-bold text-sm transition-colors">
          Simulate Pressure
        </button>
        <button id="pressure-reset-btn" class="flex-1 bg-gray-900 hover:bg-black text-white px-4 py-3 rounded-lg font-bold text-sm transition-colors">
          Reset
        </button>
      </div>

      <div class="p-3 bg-blue-50 border border-blue-200 rounded-lg mb-6">
        <p class="text-sm text-gray-700 leading-relaxed mb-2">
          <strong>Interactive Demo:</strong> Click "Simulate Pressure" to watch how context pressure builds. As <strong>token usage increases</strong>, tasks become more <strong>complex</strong>, and <strong>error rates rise</strong>. The framework monitors this relationship to detect when AI performance may degrade.
        </p>
        <p class="text-xs text-gray-600">
          The timeline on the right shows how six governance components coordinate to validate each request and maintain safe operation.
        </p>
      </div>

      <svg class="w-full mb-6" viewBox="0 0 300 150" preserveAspectRatio="xMidYMid meet">
        <path id="gauge-bg" d="M 54 120 A 96 96 0 0 1 246 120"
              stroke="#e5e7eb" stroke-width="16" fill="none" stroke-linecap="round"/>
        <path id="gauge-fill" d="M 54 120 A 96 96 0 0 1 54 120"
              stroke="#f59e0b" stroke-width="16" fill="none" stroke-linecap="round"
              class="gauge-fill-path"/>
        <text x="150" y="105" text-anchor="middle" font-size="28" font-weight="bold" fill="#1f2937" id="gauge-value">0%</text>
        <text x="150" y="125" text-anchor="middle" font-size="12" fill="#6b7280">Pressure Level</text>
      </svg>

      <div class="grid grid-cols-3 gap-2">
        <div class="text-center">
          <div class="text-2xl font-bold text-gray-900" id="metric-tokens">0</div>
          <div class="text-xs text-gray-600">Tokens Used</div>
        </div>
        <div class="text-center">
          <div class="text-2xl font-bold text-gray-900" id="metric-complexity">Low</div>
          <div class="text-xs text-gray-600">Complexity</div>
        </div>
        <div class="text-center">
          <div class="text-2xl font-bold text-gray-900" id="metric-errors">0</div>
          <div class="text-xs text-gray-600">Error Rate</div>
        </div>
      </div>
    `;

    // Clear gauge container if it exists (no longer needed)
    if (this.gaugeContainer) {
      this.gaugeContainer.innerHTML = '';
    }

    // Store references
    this.elements = {
      gaugeFill: document.getElementById('gauge-fill'),
      gaugeValue: document.getElementById('gauge-value'),
      status: document.getElementById('pressure-status'),
      tokens: document.getElementById('metric-tokens'),
      complexity: document.getElementById('metric-complexity'),
      errors: document.getElementById('metric-errors'),
      simulateBtn: document.getElementById('pressure-simulate-btn'),
      resetBtn: document.getElementById('pressure-reset-btn')
    };

    // Verify innerHTML was set
    console.log('[PressureChart] innerHTML length:', this.container.innerHTML.length);
    console.log('[PressureChart] First 100 chars:', this.container.innerHTML.substring(0, 100));

    // Verify elements were found
    console.log('[PressureChart] Elements found:', {
      gaugeFill: !!this.elements.gaugeFill,
      gaugeValue: !!this.elements.gaugeValue,
      status: !!this.elements.status,
      simulateBtn: !!this.elements.simulateBtn,
      resetBtn: !!this.elements.resetBtn
    });
  }

  attachEventListeners() {
    if (!this.elements.simulateBtn || !this.elements.resetBtn) {
      console.error('[PressureChart] Cannot attach event listeners - buttons not found');
      return;
    }
    console.log('[PressureChart] Attaching event listeners to buttons');
    this.elements.simulateBtn.addEventListener('click', () => this.simulate());
    this.elements.resetBtn.addEventListener('click', () => this.reset());
    console.log('[PressureChart] Event listeners attached successfully');
  }

  setLevel(level) {
    this.targetLevel = Math.max(0, Math.min(100, level));
    this.animateToTarget();
  }

  animateToTarget() {
    if (this.animating) return;
    this.animating = true;

    const animate = () => {
      const diff = this.targetLevel - this.currentLevel;
      if (Math.abs(diff) < 0.5) {
        this.currentLevel = this.targetLevel;
        this.animating = false;
        this.updateGauge();
        return;
      }

      this.currentLevel += diff * 0.1;
      this.updateGauge();
      requestAnimationFrame(animate);
    };

    animate();
  }

  updateGauge() {
    const level = this.currentLevel;
    const angle = (level / 100) * 180; // 0-180 degrees
    const radians = (angle * Math.PI) / 180;

    // Calculate arc endpoint (20% smaller gauge: radius 96 instead of 120)
    const centerX = 150;
    const centerY = 120;
    const radius = 96;
    const startX = 54;
    const startY = 120;
    const endX = centerX + radius * Math.cos(Math.PI - radians);
    const endY = centerY - radius * Math.sin(Math.PI - radians);

    const largeArcFlag = angle > 180 ? 1 : 0;
    const path = `M ${startX} ${startY} A ${radius} ${radius} 0 ${largeArcFlag} 1 ${endX} ${endY}`;

    this.elements.gaugeFill.setAttribute('d', path);
    this.elements.gaugeValue.textContent = `${Math.round(level)}%`;

    // Update color based on level
    let color, status;
    if (level < 25) {
      color = this.colors.low;
      status = 'NORMAL';
    } else if (level < 50) {
      color = this.colors.moderate;
      status = 'ELEVATED';
    } else if (level < 75) {
      color = this.colors.high;
      status = 'HIGH';
    } else {
      color = this.colors.critical;
      status = 'CRITICAL';
    }

    this.elements.gaugeFill.setAttribute('stroke', color);

    // Update status badge with animation
    const previousStatus = this.elements.status.textContent;
    this.elements.status.textContent = status;

    // Badge styling based on level
    const baseClasses = 'px-4 py-2 rounded-full text-sm font-bold uppercase transition-all duration-500';
    let bgClass, textClass;

    if (level < 25) {
      bgClass = 'bg-green-100';
      textClass = 'text-green-700';
    } else if (level < 50) {
      bgClass = 'bg-amber-100';
      textClass = 'text-amber-700';
    } else if (level < 75) {
      bgClass = 'bg-red-100';
      textClass = 'text-red-700';
    } else {
      bgClass = 'bg-red-200';
      textClass = 'text-red-900';
    }

    // Add pulse animation when status changes
    const pulseClass = previousStatus !== status ? 'animate-pulse' : '';
    this.elements.status.className = `${baseClasses} ${bgClass} ${textClass} ${pulseClass}`;

    // Remove pulse after animation
    if (pulseClass) {
      setTimeout(() => {
        this.elements.status.className = `${baseClasses} ${bgClass} ${textClass}`;
      }, 1000);
    }

    // Update metrics based on pressure level
    const tokens = Math.round(level * 2000); // 0-200k tokens
    const complexityLevels = ['Low', 'Moderate', 'High', 'Extreme'];
    const complexityIndex = Math.min(3, Math.floor(level / 25));
    const errorRate = Math.round(level / 5); // 0-20%

    this.elements.tokens.textContent = tokens.toLocaleString();
    this.elements.complexity.textContent = complexityLevels[complexityIndex];
    this.elements.errors.textContent = `${errorRate}%`;
  }

  simulate() {
    console.log('[PressureChart] Simulate button clicked - starting pressure simulation');

    // Trigger timeline simulation if available
    if (window.activityTimeline) {
      console.log('[PressureChart] Triggering governance flow timeline');
      window.activityTimeline.simulateFlow();
    }

    // Simulate pressure increasing from current to 85%
    const targetLevels = [30, 50, 70, 85];
    let index = 0;

    const step = () => {
      if (index >= targetLevels.length) return;
      console.log('[PressureChart] Setting pressure level to', targetLevels[index]);
      this.setLevel(targetLevels[index]);
      index++;
      setTimeout(step, 1500);
    };

    step();
  }

  reset() {
    console.log('[PressureChart] Reset button clicked');

    // Reset timeline if available
    if (window.activityTimeline) {
      console.log('[PressureChart] Resetting governance flow timeline');
      window.activityTimeline.reset();
    }

    this.setLevel(0);
  }
}

// Auto-initialize if container exists
if (typeof window !== 'undefined') {
  function initPressureChart() {
    console.log('[PressureChart] Attempting to initialize, readyState:', document.readyState);
    const container = document.getElementById('pressure-chart');
    if (container) {
      console.log('[PressureChart] Container found, creating instance');
      window.pressureChart = new PressureChart('pressure-chart');
    } else {
      console.error('[PressureChart] Container #pressure-chart not found in DOM');
    }
  }

  // Initialize immediately if DOM is already loaded, otherwise wait for DOMContentLoaded
  console.log('[PressureChart] Script loaded, readyState:', document.readyState);
  if (document.readyState === 'loading') {
    console.log('[PressureChart] Waiting for DOMContentLoaded');
    document.addEventListener('DOMContentLoaded', initPressureChart);
  } else {
    console.log('[PressureChart] DOM already loaded, initializing immediately');
    initPressureChart();
  }
}

// Export for module systems
if (typeof module !== 'undefined' && module.exports) {
  module.exports = PressureChart;
}