# Phase 3 Patch Application Script
# This script applies the final Phase 3 modifications to server/index.mjs

param(
    [switch]$Backup = $true,
    [switch]$Verify = $true
)

$ErrorActionPreference = "Stop"

$indexFile = "c:\dev\git\web\ObsiViewer\server\index.mjs"
$backupFile = "$indexFile.backup.$(Get-Date -Format 'yyyyMMdd-HHmmss')"

Write-Host "🚀 Phase 3 Patch Application" -ForegroundColor Cyan
Write-Host "================================" -ForegroundColor Cyan
Write-Host ""

# Step 1: Create backup
if ($Backup) {
    Write-Host "📦 Creating backup..." -ForegroundColor Yellow
    Copy-Item $indexFile $backupFile
    Write-Host "✅ Backup created: $backupFile" -ForegroundColor Green
    Write-Host ""
}

# Step 2: Read the file
Write-Host "📖 Reading index.mjs..." -ForegroundColor Yellow
$content = Get-Content $indexFile -Raw

# Step 3: Add setup endpoint call before app.listen()
Write-Host "🔧 Adding performance endpoint setup..." -ForegroundColor Yellow

$performanceEndpointSetup = @"
// Phase 3: Setup performance monitoring endpoint
setupPerformanceEndpoint(app, performanceMonitor, metadataCache, meilisearchCircuitBreaker);
"@

# Find the line with "// Créer le répertoire de la voûte" and insert before it
$content = $content -replace `
    "// Créer le répertoire de la voûte s'il n'existe pas", `
    "$performanceEndpointSetup`n`n// Créer le répertoire de la voûte s'il n'existe pas"

Write-Host "✅ Performance endpoint setup added" -ForegroundColor Green

# Step 4: Update app.listen() to include deferred indexing
Write-Host "🔧 Updating app.listen() for deferred indexing..." -ForegroundColor Yellow

$oldListen = @"
app.listen(PORT, '0.0.0.0', () => {
  console.log(`ObsiViewer server running on http://0.0.0.0:${PORT}`);
  console.log(`Vault directory: ${vaultDir}`);
});
"@

$newListen = @"
// Phase 3: Deferred Meilisearch indexing (non-blocking)
let indexingState = { inProgress: false, completed: false };
const scheduleIndexing = async () => {
  if (indexingState.inProgress) return;
  indexingState.inProgress = true;
  
  setImmediate(async () => {
    try {
      console.time('[Meilisearch] Background indexing');
      await fullReindex(vaultDir);
      console.timeEnd('[Meilisearch] Background indexing');
      indexingState.completed = true;
      console.log('[Meilisearch] ✅ Background indexing completed');
    } catch (error) {
      console.error('[Meilisearch] ❌ Background indexing failed:', error.message);
      indexingState.completed = false;
      // Retry after 5 minutes
      setTimeout(() => {
        indexingState.inProgress = false;
        scheduleIndexing();
      }, 5 * 60 * 1000);
    }
  });
};

const server = app.listen(PORT, '0.0.0.0', () => {
  console.log(`🚀 ObsiViewer server running on http://0.0.0.0:${PORT}`);
  console.log(`📁 Vault directory: ${vaultDir}`);
  console.log(`📊 Performance monitoring: http://0.0.0.0:${PORT}/__perf`);
  
  // Schedule background indexing (non-blocking)
  scheduleIndexing();
  console.log('✅ Server ready - Meilisearch indexing in background');
});

// Graceful shutdown
process.on('SIGINT', () => {
  console.log('\n🛑 Shutting down server...');
  server.close(() => {
    console.log('✅ Server shutdown complete');
    process.exit(0);
  });
});
"@

$content = $content -replace [regex]::Escape($oldListen), $newListen

Write-Host "✅ app.listen() updated with deferred indexing" -ForegroundColor Green

# Step 5: Write the modified content
Write-Host "💾 Writing modified index.mjs..." -ForegroundColor Yellow
Set-Content $indexFile $content -Encoding UTF8
Write-Host "✅ File written successfully" -ForegroundColor Green

# Step 6: Verify changes
if ($Verify) {
    Write-Host ""
    Write-Host "🔍 Verifying changes..." -ForegroundColor Yellow
    
    $verifyContent = Get-Content $indexFile -Raw
    
    $checks = @(
        @{ Name = "Performance endpoint setup"; Pattern = "setupPerformanceEndpoint" },
        @{ Name = "Deferred indexing"; Pattern = "scheduleIndexing" },
        @{ Name = "Graceful shutdown"; Pattern = "process.on\('SIGINT'" },
        @{ Name = "Performance monitoring URL"; Pattern = "__perf" }
    )
    
    $allPassed = $true
    foreach ($check in $checks) {
        if ($verifyContent -match $check.Pattern) {
            Write-Host "  ✅ $($check.Name)" -ForegroundColor Green
        } else {
            Write-Host "  ❌ $($check.Name)" -ForegroundColor Red
            $allPassed = $false
        }
    }
    
    if ($allPassed) {
        Write-Host ""
        Write-Host "✅ All verification checks passed!" -ForegroundColor Green
    } else {
        Write-Host ""
        Write-Host "⚠️  Some verification checks failed" -ForegroundColor Yellow
    }
}

Write-Host ""
Write-Host "================================" -ForegroundColor Cyan
Write-Host "✅ Phase 3 patch applied successfully!" -ForegroundColor Green
Write-Host ""
Write-Host "Next steps:" -ForegroundColor Cyan
Write-Host "1. Test the server: npm run start"
Write-Host "2. Check performance: curl http://localhost:3000/__perf"
Write-Host "3. Monitor cache hits in the logs"
Write-Host "4. Verify Meilisearch indexing in background"
Write-Host ""