#!/usr/bin/env node
// ═══════════════════════════════════════════════════════════════════════════
// EOS Readiness Gate — Ingen PR får mergeas om den sänker Engineering Readiness
// Erik-krav: "Readiness före: Git 82, Efter: Git 76 → Merge blockeras"
// ═══════════════════════════════════════════════════════════════════════════

import { readFileSync, existsSync } from 'fs';

const READINESS_PATH = '/home/bernt/.openclaw/workspace/EOS/readiness-report-v3.json';
const HISTORY_PATH = '/home/bernt/.openclaw/workspace/EOS/readiness-history.json';

class ReadinessGate {
  constructor() {
    this.currentReadiness = this.loadCurrentReadiness();
    this.history = this.loadHistory();
  }

  loadCurrentReadiness() {
    if (existsSync(READINESS_PATH)) {
      return JSON.parse(readFileSync(READINESS_PATH, 'utf8'));
    }
    return null;
  }

  loadHistory() {
    if (existsSync(HISTORY_PATH)) {
      return JSON.parse(readFileSync(HISTORY_PATH, 'utf8'));
    }
    return [];
  }

  /**
   * Kontrollera om en PR skulle sänka Readiness
   */
  checkPR(pr) {
    console.log(`🔍 Readiness Gate: Kontrollerar PR "${pr.title}"\n`);

    if (!this.currentReadiness) {
      console.log('❌ Ingen Readiness-rapport hittad');
      return { canMerge: false, reason: 'Ingen Readiness-rapport' };
    }

    // Simulera hur PR påverkar Readiness
    const impact = this.simulateImpact(pr);

    console.log('📊 PÅVERKAN PÅ READINESS\n');

    let blocked = false;
    const changes = [];

    for (const area of this.currentReadiness.areas) {
      const areaImpact = impact.areas.find(a => a.id === area.id);
      if (!areaImpact) continue;

      const before = area.score;
      const after = areaImpact.score;
      const delta = after - before;

      changes.push({
        area: area.name,
        before,
        after,
        delta
      });

      const icon = delta > 0 ? '📈' : delta < 0 ? '📉' : '➡️';
      console.log(`   ${icon} ${area.name}: ${before}% → ${after}% (${delta > 0 ? '+' : ''}${delta}%)`);

      // Blockera om Readiness sjunker under tröskel
      if (after < area.target && before >= area.target) {
        console.log(`      🔴 Sjunker under mål (${area.target}%)`);
        blocked = true;
      }

      // Blockera om Readiness sjunker överhuvudtaget för kritiska områden
      if (delta < 0 && ['git', 'cicd', 'backup', 'infrastructure'].includes(area.id)) {
        console.log(`      🔴 Kritiskt område försämras`);
        blocked = true;
      }
    }

    console.log();

    const result = {
      canMerge: !blocked,
      changes,
      overallBefore: this.currentReadiness.overall,
      overallAfter: impact.overall,
      overallDelta: impact.overall - this.currentReadiness.overall
    };

    if (blocked) {
      console.log('🔴 MERGE BLOCKERAD\n');
      console.log('   PR:en sänker Engineering Readiness.');
      console.log('   Åtgärda försämringarna innan merge.\n');
    } else if (result.overallDelta < 0) {
      console.log('⚠️  MERGE VARNING\n');
      console.log('   PR:en sänker Readiness men inte under tröskel.');
      console.log('   Överväg att åtgärda ändå.\n');
    } else {
      console.log('✅ MERGE GODKÄND\n');
      console.log('   PR:en förbättrar eller behåller Readiness.\n');
    }

    return result;
  }

  simulateImpact(pr) {
    // Simulera påverkan baserat på PR:ens filer
    const areas = this.currentReadiness.areas.map(area => ({
      ...area,
      score: area.score
    }));

    let overallImpact = 0;

    for (const file of pr.files || []) {
      // Exempel: Om PR lägger till tester → öka Testing
      if (file.includes('test') || file.includes('spec')) {
        const testingArea = areas.find(a => a.id === 'testing');
        if (testingArea) testingArea.score = Math.min(100, testingArea.score + 5);
      }

      // Om PR lägger till CI/CD → öka CI/CD
      if (file.includes('.github') || file.includes('.gitlab')) {
        const cicdArea = areas.find(a => a.id === 'cicd');
        if (cicdArea) cicdArea.score = Math.min(100, cicdArea.score + 10);
      }

      // Om PR ändrar utan .gitignore → sänk Git
      if (file.includes('node_modules') || file.includes('dist')) {
        const gitArea = areas.find(a => a.id === 'git');
        if (gitArea) gitArea.score = Math.max(0, gitArea.score - 10);
      }
    }

    // Beräkna ny overall
    let totalScore = 0;
    let totalWeight = 0;
    for (const area of areas) {
      totalScore += area.score * area.weight;
      totalWeight += area.weight;
    }

    return {
      overall: Math.round(totalScore / totalWeight),
      areas
    };
  }
}

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

const gate = new ReadinessGate();
const pr = {
  title: process.argv[2] || 'Lägg till tester för Mission Service',
  files: process.argv.slice(3).length > 0 ? process.argv.slice(3) : [
    'src/services/mission.test.ts',
    '.github/workflows/test.yml'
  ]
};

gate.checkPR(pr);