name: Build and Deploy CPRNIMS

on:
  push:
    branches: [ main ]

jobs:
  build-and-deploy:
    runs-on: windows

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Clean previous publish output
        shell: pwsh
        run: |
          Remove-Item -Recurse -Force "C:\ci-output\webapi" -ErrorAction SilentlyContinue
          Remove-Item -Recurse -Force "C:\ci-output\webapps" -ErrorAction SilentlyContinue

      - name: Publish WebApi
        shell: pwsh
        run: dotnet publish .\CPRNIMS.WebApi\CPRNIMS.WebApi.csproj -c Release -o C:\ci-output\webapi

      - name: Publish WebApps
        shell: pwsh
        run: dotnet publish .\CPRNIMS.WebApps\CPRNIMS.WebApps.csproj -c Release -o C:\ci-output\webapps

      # ---- Backup current live deployment before touching anything ----
      - name: Backup current live files
        shell: pwsh
        run: |
          $stamp = Get-Date -Format "yyyyMMdd-HHmmss"
          New-Item -ItemType Directory -Force -Path "C:\backups\$stamp" | Out-Null

          # Mirror current live folders into the backup location (only if they exist / aren't empty)
          if (Test-Path "C:\inetpub\cprnims-api") {
            robocopy "C:\inetpub\cprnims-api" "C:\backups\$stamp\webapi" /MIR /R:2 /W:3 | Out-Null
          }
          if (Test-Path "C:\inetpub\cprnims-web") {
            robocopy "C:\inetpub\cprnims-web" "C:\backups\$stamp\webapps" /MIR /R:2 /W:3 | Out-Null
          }

          # Record this backup's timestamp so later steps know where it lives
          $stamp | Out-File -FilePath "C:\backups\latest.txt" -Encoding ascii -NoNewline

          # Keep only the last 5 backups to avoid filling the disk
          $all = Get-ChildItem "C:\backups" -Directory | Sort-Object Name -Descending
          if ($all.Count -gt 5) {
            $all | Select-Object -Skip 5 | Remove-Item -Recurse -Force
          }

          Write-Host "Backed up current deployment to C:\backups\$stamp"
          exit 0

      - name: Stop app pools
        shell: pwsh
        run: |
          Import-Module WebAdministration
          Stop-WebAppPool -Name "CPRNIMS-Api" -ErrorAction SilentlyContinue
          Stop-WebAppPool -Name "CPRNIMS-Web" -ErrorAction SilentlyContinue
          Start-Sleep -Seconds 3

      - name: Deploy WebApi files
        id: deploy_api
        shell: pwsh
        run: |
          robocopy "C:\ci-output\webapi" "C:\inetpub\cprnims-api" /MIR /R:3 /W:5
          $rc = $LASTEXITCODE
          Write-Host "ROBOCOPY EXIT CODE: $rc"
          if ($rc -ge 8) {
            throw "robocopy failed for WebApi with exit code $rc"
          }
          exit 0

      - name: Deploy WebApps files
        id: deploy_web
        shell: pwsh
        run: |
          robocopy "C:\ci-output\webapps" "C:\inetpub\cprnims-web" /MIR /R:3 /W:5
          $rc = $LASTEXITCODE
          Write-Host "ROBOCOPY EXIT CODE: $rc"
          if ($rc -ge 8) {
            throw "robocopy failed for WebApps with exit code $rc"
          }
          exit 0

      - name: Start app pools
        shell: pwsh
        run: |
          Import-Module WebAdministration
          Start-WebAppPool -Name "CPRNIMS-Api"
          Start-WebAppPool -Name "CPRNIMS-Web"

      - name: Verify app pools are running
        shell: pwsh
        run: |
          Start-Sleep -Seconds 3
          Import-Module WebAdministration
          $api = Get-WebAppPoolState -Name "CPRNIMS-Api"
          $web = Get-WebAppPoolState -Name "CPRNIMS-Web"
          Write-Host "CPRNIMS-Api: $($api.Value)"
          Write-Host "CPRNIMS-Web: $($web.Value)"
          if ($api.Value -ne "Started" -or $web.Value -ne "Started") {
            throw "One or more app pools failed to start"
          }

      # ---- Rollback path: only runs if any prior step in this job failed ----
      - name: ROLLBACK - restore previous backup
        if: failure()
        shell: pwsh
        run: |
          $stamp = Get-Content "C:\backups\latest.txt" -Raw
          $backupPath = "C:\backups\$stamp"
          Write-Host "Deployment failed - rolling back to backup: $backupPath"

          Import-Module WebAdministration
          Stop-WebAppPool -Name "CPRNIMS-Api" -ErrorAction SilentlyContinue
          Stop-WebAppPool -Name "CPRNIMS-Web" -ErrorAction SilentlyContinue
          Start-Sleep -Seconds 3

          if (Test-Path "$backupPath\webapi") {
            robocopy "$backupPath\webapi" "C:\inetpub\cprnims-api" /MIR /R:3 /W:5 | Out-Null
          }
          if (Test-Path "$backupPath\webapps") {
            robocopy "$backupPath\webapps" "C:\inetpub\cprnims-web" /MIR /R:3 /W:5 | Out-Null
          }

          Start-WebAppPool -Name "CPRNIMS-Api"
          Start-WebAppPool -Name "CPRNIMS-Web"

          Write-Host "Rollback complete. Restored from $backupPath"
          exit 0

      - name: ROLLBACK - verify pools after restore
        if: failure()
        shell: pwsh
        run: |
          Start-Sleep -Seconds 3
          Import-Module WebAdministration
          $api = Get-WebAppPoolState -Name "CPRNIMS-Api"
          $web = Get-WebAppPoolState -Name "CPRNIMS-Web"
          Write-Host "After rollback - CPRNIMS-Api: $($api.Value)"
          Write-Host "After rollback - CPRNIMS-Web: $($web.Value)"
          if ($api.Value -ne "Started" -or $web.Value -ne "Started") {
            Write-Host "WARNING: app pools still not running after rollback. Manual intervention needed."
          }