#!/usr/bin/env node
// ═══════════════════════════════════════════════════════════════════════════
// SIL Historical Analysis — Analysera trender över tid
// Erik-krav: "Vilka moduler orsakar flest regressionsfel? Vilka komponenter
//             förändras oftast? Vilka delar av systemet har lägst confidence?"
// ═══════════════════════════════════════════════════════════════════════════

import { readFileSync, existsSync, writeFileSync } from 'fs';

const LOGS = {
  shadow: '/home/bernt/.openclaw/workspace/SIL/shadow-log.jsonl',
  gold: '/home/bernt/.openclaw/workspace/SIL/gold-set.jsonl',
  stability: '/home/bernt/.openclaw/workspace/SIL/stability-log.jsonl',
  versions: '/home/bernt/.openclaw/workspace/SIL/graph-version-log.jsonl',
  policy: '/home/bernt/.openclaw/workspace/SIL/policy-violations.jsonl',
  reasoning: '/home/bernt/.openclaw/workspace/SIL/reasoning-results.jsonl'
};

class HistoricalAnalysis {
  constructor() {
    this.data = this.loadAllLogs();
  }

  loadAllLogs() {
    const data = {};
    for (const [key, path] of Object.entries(LOGS)) {
      data[key] = this.loadLog(path);
    }
    return data;
  }

  loadLog(path) {
    if (!existsSync(path)) return [];
    return readFileSync(path, 'utf8')
      .split('\n')
      .filter(line => line.trim())
      .map(line => {
        try { return JSON.parse(line); } catch { return null; }
      })
      .filter(Boolean);
  }

  // ── Trendanalyser ───────────────────────────────────────────────────────

  /**
   * Vilka moduler orsakar flest regressionsfel?
   */
  analyzeRegressionFailures() {
    const goldEntries = this.data.gold;
    const failures = {};

    for (const entry of goldEntries) {
      const predictions = entry.predictions || [];
      for (const pred of predictions) {
        if (pred.verified === false) {
          failures[pred.component] = (failures[pred.component] || 0) + 1;
        }
      }
    }

    return Object.entries(failures)
      .sort((a, b) => b[1] - a[1])
      .map(([component, count]) => ({
        component,
        failures: count,
        percentage: Math.round(count / goldEntries.length * 100) + '%'
      }));
  }

  /**
   * Vilka komponenter förändras oftast?
   */
  analyzeChangeFrequency() {
    const shadowEntries = this.data.shadow;
    const changes = {};

    for (const entry of shadowEntries) {
      const components = entry.components || entry.changedComponents || [];
      if (!Array.isArray(components)) continue;
      for (const comp of components) {
        const compId = typeof comp === 'string' ? comp : comp.id;
        if (compId) {
          changes[compId] = (changes[compId] || 0) + 1;
        }
      }
    }

    return Object.entries(changes)
      .sort((a, b) => b[1] - a[1])
      .map(([component, count]) => ({
        component,
        changes: count,
        trend: this.calculateTrend(component)
      }));
  }

  /**
   * Vilka delar har lägst confidence?
   */
  analyzeLowConfidence() {
    const shadowEntries = this.data.shadow;
    const confidenceByComponent = {};

    for (const entry of shadowEntries) {
      const components = entry.components || entry.changedComponents || [];
      if (!Array.isArray(components)) continue;
      for (const comp of components) {
        const compId = typeof comp === 'string' ? comp : comp.id;
        if (!compId) continue;
        if (!confidenceByComponent[compId]) {
          confidenceByComponent[compId] = [];
        }
        confidenceByComponent[compId].push(entry.confidence || 0);
      }
    }

    return Object.entries(confidenceByComponent)
      .map(([component, confidences]) => ({
        component,
        avgConfidence: Math.round(
          confidences.reduce((a, b) => a + b, 0) / confidences.length * 100
        ) + '%',
        minConfidence: Math.round(Math.min(...confidences) * 100) + '%',
        samples: confidences.length
      }))
      .sort((a, b) => parseFloat(a.avgConfidence) - parseFloat(b.avgConfidence));
  }

  /**
   * Vilka beroenden är mest instabila?
   */
  analyzeUnstableDependencies() {
    const goldEntries = this.data.gold;
    const dependencyChanges = {};

    for (const entry of goldEntries) {
      const predicted = entry.predicted || [];
      const actual = entry.actual || [];

      // Räkna felaktiga förutsägelser per komponent
      for (const pred of predicted) {
        if (!actual.includes(pred)) {
          dependencyChanges[pred] = (dependencyChanges[pred] || 0) + 1;
        }
      }
    }

    return Object.entries(dependencyChanges)
      .sort((a, b) => b[1] - a[1])
      .map(([component, count]) => ({
        component,
        falsePredictions: count,
        instability: count / goldEntries.length
      }));
  }

  /**
   * Var ökar den tekniska skulden snabbast?
   */
  analyzeTechnicalDebt() {
    const policyEntries = this.data.policy;
    const violationsByTime = {};

    for (const entry of policyEntries) {
      const date = entry.timestamp?.split('T')[0];
      if (!date) continue;

      if (!violationsByTime[date]) {
        violationsByTime[date] = { count: 0, critical: 0 };
      }

      violationsByTime[date].count++;
      if (entry.severity === 'CRITICAL') {
        violationsByTime[date].critical++;
      }
    }

    const sorted = Object.entries(violationsByTime)
      .sort((a, b) => new Date(a[0]) - new Date(b[0]));

    // Beräkna trend
    const trends = [];
    for (let i = 1; i < sorted.length; i++) {
      const prev = sorted[i - 1][1];
      const curr = sorted[i][1];
      trends.push({
        date: sorted[i][0],
        change: curr.count - prev.count,
        acceleration: (curr.count - prev.count) - (prev.count - (sorted[i - 2]?.[1]?.count || 0))
      });
    }

    return {
      daily: sorted.map(([date, data]) => ({ date, ...data })),
      trends: trends.slice(-7), // senaste 7 dagarna
      increasing: trends.filter(t => t.change > 0).length,
      decreasing: trends.filter(t => t.change < 0).length
    };
  }

  /**
   * Beräkna trend för en komponent
   */
  calculateTrend(component) {
    const shadowEntries = this.data.shadow;
    const byWeek = {};

    for (const entry of shadowEntries) {
      const components = entry.components || [];
      if (!components.includes(component)) continue;

      const date = entry.timestamp?.split('T')[0];
      if (!date) continue;

      const week = this.getWeekKey(new Date(date));
      byWeek[week] = (byWeek[week] || 0) + 1;
    }

    const weeks = Object.entries(byWeek).sort();
    if (weeks.length < 2) return 'stable';

    const first = weeks[0][1];
    const last = weeks[weeks.length - 1][1];

    if (last > first * 1.5) return 'increasing';
    if (last < first * 0.5) return 'decreasing';
    return 'stable';
  }

  getWeekKey(date) {
    const d = new Date(date);
    d.setHours(0, 0, 0, 0);
    d.setDate(d.getDate() - d.getDay() + 1);
    return d.toISOString().split('T')[0];
  }

  // ── Sammanfattning ──────────────────────────────────────────────────────

  generateReport() {
    const report = {
      timestamp: new Date().toISOString(),
      regressions: this.analyzeRegressionFailures(),
      changeFrequency: this.analyzeChangeFrequency(),
      lowConfidence: this.analyzeLowConfidence(),
      unstableDependencies: this.analyzeUnstableDependencies(),
      technicalDebt: this.analyzeTechnicalDebt()
    };

    this.printReport(report);
    this.saveReport(report);

    return report;
  }

  printReport(report) {
    console.log('╔═══════════════════════════════════════════════════════════════╗');
    console.log('║           SIL HISTORICAL ANALYSIS                             ║');
    console.log('║           Trender och långsiktiga mönster                     ║');
    console.log('╚═══════════════════════════════════════════════════════════════╝');
    console.log();

    // Regressionsfel
    console.log('🔴 MODULER MED FLEST REGRESSIONSFEL\n');
    for (const r of report.regressions.slice(0, 10)) {
      console.log(`   ${r.component}: ${r.failures} fel (${r.percentage})`);
    }
    console.log();

    // Förändringsfrekvens
    console.log('📈 MEST FÖRÄNDRADE KOMPONENTER\n');
    for (const c of report.changeFrequency.slice(0, 10)) {
      const icon = c.trend === 'increasing' ? '📈' :
                  c.trend === 'decreasing' ? '📉' : '➡️';
      console.log(`   ${icon} ${c.component}: ${c.changes} ändringar (${c.trend})`);
    }
    console.log();

    // Låg confidence
    console.log('⚠️  LÄGST CONFIDENCE\n');
    for (const c of report.lowConfidence.slice(0, 10)) {
      console.log(`   ${c.component}: ${c.avgConfidence} (min: ${c.minConfidence}, ${c.samples} samples)`);
    }
    console.log();

    // Instabila beroenden
    console.log('🌊 INSTABILA BEROENDEN\n');
    for (const d of report.unstableDependencies.slice(0, 10)) {
      console.log(`   ${d.component}: ${d.falsePredictions} felaktiga förutsägelser`);
    }
    console.log();

    // Teknisk skuld
    if (report.technicalDebt) {
      console.log('💰 TEKNISK SKULD\n');
      console.log(`   Trend: ${report.technicalDebt.increasing > report.technicalDebt.decreasing ? 'ÖKANDE' : 'MINSKANDE'}`);
      console.log(`   Dagar med ökning: ${report.technicalDebt.increasing}`);
      console.log(`   Dagar med minskning: ${report.technicalDebt.decreasing}`);

      if (report.technicalDebt.trends.length > 0) {
        console.log('\n   Senaste 7 dagarna:');
        for (const t of report.technicalDebt.trends) {
          const icon = t.change > 0 ? '📈' : t.change < 0 ? '📉' : '➡️';
          console.log(`      ${icon} ${t.date}: ${t.change > 0 ? '+' : ''}${t.change}`);
        }
      }
      console.log();
    }

    console.log('═══════════════════════════════════════════════════════════════\n');
  }

  saveReport(report) {
    const filename = `/home/bernt/.openclaw/workspace/SIL/historical-report-${new Date().toISOString().split('T')[0]}.json`;
    writeFileSync(filename, JSON.stringify(report, null, 2));
    console.log(`💾 Rapport sparad: ${filename}\n`);
  }
}

// ── Main ──────────────────────────────────────────────────────────────────

const analysis = new HistoricalAnalysis();
const command = process.argv[2] || '--report';

if (command === '--report') {
  analysis.generateReport();
} else if (command === '--regressions') {
  console.log(JSON.stringify(analysis.analyzeRegressionFailures(), null, 2));
} else if (command === '--changes') {
  console.log(JSON.stringify(analysis.analyzeChangeFrequency(), null, 2));
} else if (command === '--confidence') {
  console.log(JSON.stringify(analysis.analyzeLowConfidence(), null, 2));
} else if (command === '--debt') {
  console.log(JSON.stringify(analysis.analyzeTechnicalDebt(), null, 2));
} else {
  console.log('Användning:');
  console.log('  node historical-analysis.mjs --report        # Full rapport');
  console.log('  node historical-analysis.mjs --regressions   # Regressionsfel');
  console.log('  node historical-analysis.mjs --changes       # Förändringsfrekvens');
  console.log('  node historical-analysis.mjs --confidence    # Låg confidence');
  console.log('  node historical-analysis.mjs --debt          # Teknisk skuld');
}