csharp-version-check.yml

name: C# 7.3 Compatibility Check

on:
  pull_request:
    paths:
      - "**.cs"
  push:
    branches:
      - main
    paths:
      - "**.cs"

jobs:
  csharp-version-check:
    name: Verify C# 7.3 Compatibility
    runs-on: [self-hosted, linux, x64, giveaway-bot]
    timeout-minutes: 5
    permissions:
      contents: read

    steps:
      - name: Checkout repository
        uses: actions/checkout@v6

      - name: Scan for C# 8.0+ Features
        shell: bash
        run: |
          echo "🔍 Scanning for C# 8.0+ features incompatible with Streamer.bot runtime..."

          violations=0

          # 1. Null-coalescing assignment (??=)
          if grep -rnF '??=' --include='*.cs' .; then
            echo "❌ Found null-coalescing assignment (??=) - C# 8.0+"
            violations=$((violations + 1))
          fi

          # 2. Switch expressions (T => Val) - Loose check
          # Matches "switch {" or "switch{" followed eventually by "=>"
          if grep -rEn 'switch\s*\{.*=>' --include='*.cs' .; then
            echo "❌ Found possible switch expression - C# 8.0+"
            violations=$((violations + 1))
          fi

          # 3. Index/Range operators ([^1], [1..2])
          # Exclude regex attributes which might look like ranges
          if grep -rn '\[\^' --include='*.cs' . | grep -v 'Regex'; then
            echo "❌ Found index from end operator ([^) - C# 8.0+"
            violations=$((violations + 1))
          fi

          if grep -rEn '\[[0-9a-zA-Z_]*\.\.[0-9a-zA-Z_]*\]' --include='*.cs' .; then
            echo "❌ Found range operator ([..]) - C# 8.0+"
            violations=$((violations + 1))
          fi

          # 4. Using declarations (using var x =)
          # Regex: using [space] Type [space] Name [space] =
          if grep -rEn 'using[[:space:]]+[a-zA-Z0-9_<>]+[[:space:]]+[a-zA-Z0-9_]+[[:space:]]*=' --include='*.cs' . | grep -v '('; then
             # Filter out 'using (var x = ...)' which is valid
             echo "❌ Found using declaration (non-block) - C# 8.0+"
            violations=$((violations + 1))
          fi

          if [ $violations -gt 0 ]; then
            echo "::error::Found $violations potential C# 8.0+ violations."
            exit 1
          fi

          echo "✅ No C# 8.0+ features detected."