#!/usr/bin/env node
/**
 * Session Pressure Monitor Script
 *
 * Uses ContextPressureMonitor to analyze current session state and provide
 * recommendations for session management.
 *
 * This script demonstrates the Tractatus framework dogfooding itself - using
 * its own governance services to manage AI-assisted development sessions.
 *
 * Usage:
 *   node scripts/check-session-pressure.js [options]
 *
 * Options:
 *   --tokens <current>/<budget>   Current token usage (e.g., 89195/200000)
 *   --messages <count>            Number of messages in conversation
 *   --tasks <count>               Number of active tasks
 *   --errors <count>              Recent errors in last 10 minutes
 *   --json                        Output JSON format
 *   --verbose                     Show detailed analysis
 */

const monitor = require('../src/services/ContextPressureMonitor.service');
const fs = require('fs');
const path = require('path');

const SESSION_STATE_PATH = path.join(__dirname, '../.claude/session-state.json');

// Load session state to get compact history
function loadSessionState() {
  if (!fs.existsSync(SESSION_STATE_PATH)) {
    return null;
  }
  return JSON.parse(fs.readFileSync(SESSION_STATE_PATH, 'utf8'));
}

// Analyze compact event patterns
function analyzeCompactHistory(sessionState) {
  if (!sessionState || !sessionState.auto_compact_events || sessionState.auto_compact_events.length === 0) {
    return null;
  }

  const events = sessionState.auto_compact_events;

  // Calculate averages
  const avgTokens = events.reduce((sum, e) => sum + e.metrics.tokens_at_compact, 0) / events.length;
  const avgMessages = events.reduce((sum, e) => sum + e.metrics.messages, 0) / events.length;
  const avgActions = events.reduce((sum, e) => sum + e.metrics.action_count, 0) / events.length;
  const avgDuration = events.reduce((sum, e) => sum + e.metrics.session_duration_minutes, 0) / events.length;

  // Pressure levels at compact
  const pressureLevels = events.map(e => e.metrics.pressure_level);
  const pressureScores = events.filter(e => e.metrics.pressure_score !== null)
                                .map(e => e.metrics.pressure_score);
  const avgPressureScore = pressureScores.length > 0
    ? pressureScores.reduce((sum, s) => sum + s, 0) / pressureScores.length
    : null;

  // Token percentage distribution
  const tokenPercentages = events.map(e => parseFloat(e.metrics.token_percentage));
  const avgTokenPercentage = tokenPercentages.reduce((sum, p) => sum + p, 0) / tokenPercentages.length;

  return {
    total_compacts: events.length,
    averages: {
      tokens: Math.round(avgTokens),
      messages: Math.round(avgMessages),
      actions: Math.round(avgActions),
      duration_minutes: Math.round(avgDuration),
      token_percentage: avgTokenPercentage.toFixed(1),
      pressure_score: avgPressureScore !== null ? (avgPressureScore * 100).toFixed(1) : null
    },
    pressure_levels: pressureLevels,
    latest_compact: events[events.length - 1]
  };
}

// Predict compact risk based on historical data
function predictCompactRisk(currentMetrics, compactHistory) {
  if (!compactHistory) {
    return { level: 'UNKNOWN', confidence: 0, factors: [] };
  }

  const factors = [];
  let riskScore = 0;

  // Token proximity to average compact point
  if (currentMetrics.tokens && compactHistory.averages.tokens) {
    const tokenProximity = currentMetrics.tokens / compactHistory.averages.tokens;
    if (tokenProximity > 0.9) {
      riskScore += 30;
      factors.push(`Tokens near historical compact point (${(tokenProximity * 100).toFixed(0)}%)`);
    } else if (tokenProximity > 0.8) {
      riskScore += 15;
      factors.push(`Tokens approaching compact threshold (${(tokenProximity * 100).toFixed(0)}%)`);
    }
  }

  // Message proximity to average compact point
  if (currentMetrics.messages && compactHistory.averages.messages) {
    const messageProximity = currentMetrics.messages / compactHistory.averages.messages;
    if (messageProximity > 0.9) {
      riskScore += 30;
      factors.push(`Messages near historical compact point (${(messageProximity * 100).toFixed(0)}%)`);
    } else if (messageProximity > 0.8) {
      riskScore += 15;
      factors.push(`Messages approaching compact threshold (${(messageProximity * 100).toFixed(0)}%)`);
    }
  }

  // Action count proximity
  if (currentMetrics.actions && compactHistory.averages.actions) {
    const actionProximity = currentMetrics.actions / compactHistory.averages.actions;
    if (actionProximity > 0.9) {
      riskScore += 20;
      factors.push(`Actions near historical compact point (${(actionProximity * 100).toFixed(0)}%)`);
    }
  }

  // Determine risk level
  let level;
  if (riskScore >= 60) level = 'HIGH';
  else if (riskScore >= 30) level = 'MEDIUM';
  else level = 'LOW';

  return {
    level,
    score: riskScore,
    confidence: Math.min(compactHistory.total_compacts * 20, 100), // More data = more confidence
    factors
  };
}

// Parse command line arguments
function parseArgs() {
  const args = process.argv.slice(2);
  const options = {
    tokenUsage: null,
    tokenBudget: null,
    messages: 0,
    tasks: 1,
    errors: 0,
    json: false,
    verbose: false
  };

  for (let i = 0; i < args.length; i++) {
    switch (args[i]) {
      case '--tokens':
        const [current, budget] = args[++i].split('/').map(Number);
        options.tokenUsage = current;
        options.tokenBudget = budget;
        break;
      case '--messages':
        options.messages = parseInt(args[++i]);
        break;
      case '--tasks':
        options.tasks = parseInt(args[++i]);
        break;
      case '--errors':
        options.errors = parseInt(args[++i]);
        break;
      case '--json':
        options.json = true;
        break;
      case '--verbose':
        options.verbose = true;
        break;
      case '--help':
        console.log(`
Session Pressure Monitor - Tractatus Framework

Usage:
  node scripts/check-session-pressure.js [options]

Options:
  --tokens <current>/<budget>   Token usage (e.g., 89195/200000)
  --messages <count>            Conversation length
  --tasks <count>               Active tasks
  --errors <count>              Recent errors
  --json                        JSON output
  --verbose                     Detailed analysis
  --help                        Show this help

Examples:
  # Check current session
  node scripts/check-session-pressure.js --tokens 89195/200000 --messages 28 --tasks 2

  # JSON output for automation
  node scripts/check-session-pressure.js --tokens 150000/200000 --json

  # Verbose analysis
  node scripts/check-session-pressure.js --tokens 180000/200000 --messages 50 --verbose
        `);
        process.exit(0);
    }
  }

  return options;
}

// Format pressure level with color
function formatLevel(level) {
  const colors = {
    NORMAL: '\x1b[32m',      // Green
    ELEVATED: '\x1b[33m',    // Yellow
    HIGH: '\x1b[35m',        // Magenta
    CRITICAL: '\x1b[31m',    // Red
    DANGEROUS: '\x1b[41m'    // Red background
  };
  const reset = '\x1b[0m';
  return `${colors[level] || ''}${level}${reset}`;
}

// Format recommendation with icon
function formatRecommendation(rec) {
  const icons = {
    CONTINUE_NORMAL: '✅',
    INCREASE_VERIFICATION: '⚠️',
    SUGGEST_CONTEXT_REFRESH: '🔄',
    MANDATORY_VERIFICATION: '🚨',
    IMMEDIATE_HALT: '🛑'
  };
  return `${icons[rec] || '•'} ${rec}`;
}

// Main analysis function
async function analyzeSession(options) {
  // Build context object
  const context = {
    messages_count: options.messages,
    task_depth: options.tasks,
    errors_recent: options.errors
  };

  // Add token usage if provided
  if (options.tokenUsage && options.tokenBudget) {
    context.token_usage = options.tokenUsage / options.tokenBudget;
    context.token_limit = options.tokenBudget;
  }

  // Load session state and compact history
  const sessionState = loadSessionState();
  const compactHistory = sessionState ? analyzeCompactHistory(sessionState) : null;

  // Predict compact risk
  const compactRisk = compactHistory ? predictCompactRisk({
    tokens: options.tokenUsage,
    messages: options.messages,
    actions: sessionState?.action_count || 0
  }, compactHistory) : null;

  // Run analysis
  const analysis = await monitor.analyzePressure(context);
  analysis.compactHistory = compactHistory;
  analysis.compactRisk = compactRisk;

  // Output results
  if (options.json) {
    console.log(JSON.stringify(analysis, null, 2));
  } else {
    console.log('\n╔════════════════════════════════════════════════════════════════╗');
    console.log('║         Tractatus Session Pressure Analysis                   ║');
    console.log('╚════════════════════════════════════════════════════════════════╝\n');

    // Pressure Level
    console.log(`Pressure Level: ${formatLevel(analysis.level)}`);
    console.log(`Overall Score:  ${(analysis.overall_score * 100).toFixed(1)}%`);
    console.log(`Action:         ${analysis.action}\n`);

    // Metrics
    console.log('Metrics:');
    console.log(`  Token Usage:     ${(analysis.metrics.tokenUsage.score * 100).toFixed(1)}%`);
    console.log(`  Conversation:    ${(analysis.metrics.conversationLength.score * 100).toFixed(1)}%`);
    console.log(`  Task Complexity: ${(analysis.metrics.taskComplexity.score * 100).toFixed(1)}%`);
    console.log(`  Error Frequency: ${(analysis.metrics.errorFrequency.score * 100).toFixed(1)}%`);
    console.log(`  Instructions:    ${(analysis.metrics.instructionDensity.score * 100).toFixed(1)}%\n`);

    // Recommendations
    if (analysis.recommendations.length > 0) {
      console.log('Recommendations:');
      analysis.recommendations.forEach(rec => {
        console.log(`  ${formatRecommendation(rec)}`);
      });
      console.log();
    }

    // Warnings
    if (analysis.warnings.length > 0) {
      console.log('⚠️  Warnings:');
      analysis.warnings.forEach(warning => {
        console.log(`  • ${warning}`);
      });
      console.log();
    }

    // Trend
    if (analysis.trend) {
      const trendIcons = {
        escalating: '📈 Escalating',
        improving: '📉 Improving',
        stable: '➡️  Stable'
      };
      console.log(`Trend: ${trendIcons[analysis.trend]}\n`);
    }

    // Compact History and Risk Prediction
    if (analysis.compactHistory) {
      console.log('═════════════════════════════════════════════════════════════════');
      console.log('📊 Auto-Compact History\n');
      console.log(`Total Compacts Recorded: ${analysis.compactHistory.total_compacts}`);
      console.log('\nAverage Metrics at Compact:');
      console.log(`  Tokens:          ${analysis.compactHistory.averages.tokens} (${analysis.compactHistory.averages.token_percentage}% of budget)`);
      console.log(`  Messages:        ${analysis.compactHistory.averages.messages}`);
      console.log(`  Actions:         ${analysis.compactHistory.averages.actions}`);
      console.log(`  Session Length:  ${analysis.compactHistory.averages.duration_minutes} minutes`);
      if (analysis.compactHistory.averages.pressure_score) {
        console.log(`  Pressure Score:  ${analysis.compactHistory.averages.pressure_score}%`);
      }

      // Latest compact info
      const latest = analysis.compactHistory.latest_compact;
      const timeSince = Math.round((Date.now() - new Date(latest.timestamp).getTime()) / (1000 * 60));
      console.log(`\nLast Compact: ${timeSince} minutes ago`);
      if (latest.note) {
        console.log(`  Note: ${latest.note}`);
      }

      console.log();

      // Compact risk prediction
      if (analysis.compactRisk && analysis.compactRisk.level !== 'UNKNOWN') {
        const riskIcons = {
          LOW: '✅',
          MEDIUM: '⚠️',
          HIGH: '🚨'
        };
        const riskColors = {
          LOW: '\x1b[32m',    // Green
          MEDIUM: '\x1b[33m', // Yellow
          HIGH: '\x1b[31m'    // Red
        };
        const reset = '\x1b[0m';

        console.log('🔮 Compact Risk Prediction\n');
        console.log(`Risk Level: ${riskIcons[analysis.compactRisk.level]} ${riskColors[analysis.compactRisk.level]}${analysis.compactRisk.level}${reset}`);
        console.log(`Risk Score: ${analysis.compactRisk.score}/100`);
        console.log(`Confidence: ${analysis.compactRisk.confidence}% (based on ${analysis.compactHistory.total_compacts} recorded events)`);

        if (analysis.compactRisk.factors.length > 0) {
          console.log('\nRisk Factors:');
          analysis.compactRisk.factors.forEach(factor => {
            console.log(`  • ${factor}`);
          });
        }

        console.log();

        // Warning if high risk
        if (analysis.compactRisk.level === 'HIGH') {
          console.log('⚠️  HIGH COMPACT RISK: Consider summarizing progress and planning next steps');
          console.log('   to minimize context loss if compaction occurs.\n');
        } else if (analysis.compactRisk.level === 'MEDIUM') {
          console.log('📝 MEDIUM COMPACT RISK: Compact may occur soon. Be prepared to\n');
          console.log('   summarize key decisions and action items.\n');
        }
      }

      console.log('═════════════════════════════════════════════════════════════════\n');
    } else {
      console.log('═════════════════════════════════════════════════════════════════');
      console.log('📊 Auto-Compact History\n');
      console.log('No compact events recorded yet.');
      console.log('\nWhen you notice an auto-compact (context compression), run:');
      console.log('  node scripts/record-auto-compact.js --tokens <current>/<budget>\n');
      console.log('This builds empirical data to predict future compacts.\n');
      console.log('═════════════════════════════════════════════════════════════════\n');
    }

    // Verbose output
    if (options.verbose) {
      console.log('Detailed Metrics:');
      Object.entries(analysis.metrics).forEach(([name, metric]) => {
        console.log(`  ${name}:`);
        console.log(`    Raw: ${metric.raw}`);
        console.log(`    Normalized: ${metric.normalized.toFixed(3)}`);
        console.log(`    Threshold: ${metric.threshold}`);
        if (metric.factors) {
          console.log(`    Factors: ${metric.factors.join(', ')}`);
        }
      });
      console.log();
    }

    // Summary
    console.log('─────────────────────────────────────────────────────────────────');
    if (analysis.level === 'NORMAL') {
      console.log('✅ Session conditions are normal. Continue working.\n');
    } else if (analysis.level === 'ELEVATED') {
      console.log('⚠️  Pressure is elevated. Increase verification and monitoring.\n');
    } else if (analysis.level === 'HIGH') {
      console.log('🔄 Pressure is high. Consider refreshing context soon.\n');
    } else if (analysis.level === 'CRITICAL') {
      console.log('🚨 Critical pressure! Mandatory verification required.\n');
    } else if (analysis.level === 'DANGEROUS') {
      console.log('🛑 DANGEROUS conditions! Halt and refresh context immediately.\n');
    }
  }

  return analysis;
}

// Run if called directly
if (require.main === module) {
  (async () => {
    const options = parseArgs();

    // Validate inputs
    if (options.tokenUsage === null) {
      console.error('Error: --tokens argument required');
      console.error('Usage: node scripts/check-session-pressure.js --tokens <current>/<budget>');
      console.error('Run with --help for more information');
      process.exit(1);
    }

    const analysis = await analyzeSession(options);

    // Exit with appropriate code
    const exitCodes = {
      NORMAL: 0,
      ELEVATED: 0,
      HIGH: 1,
      CRITICAL: 2,
      DANGEROUS: 3
    };
    process.exit(exitCodes[analysis.level] || 0);
  })().catch(err => {
    console.error('Error during pressure analysis:', err);
    process.exit(1);
  });
}

module.exports = { analyzeSession, parseArgs };