name: MVS Upload & Execute

on:
  push:
    branches: [ master ]
  pull_request:
    branches: [ master ]

jobs:
  upload-and-run:
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Find changed source files
        id: files
        run: |
          # Try to list changed .c or .bas files from last commit
          CHANGED_FILES=$(git diff --name-only HEAD~1 -- '*.c' '*.bas' 2>/dev/null | head -1)
          echo "Changed files from last commit: ${CHANGED_FILES}"
          # Fail if no C/BAS files were found 
          if [ -z "$CHANGED_FILES" ]; then
            echo "No C/BAS files found; skipping."
            exit 1
          fi
          # Fallback to all .c/.bas files if no previous commit
          if [ -z "$CHANGED_FILES" ]; then
            echo "No previous commit found; using all C/BAS files."
            CHANGED_FILES=$(git ls-files '*.c' '*.bas' | head -1)
          fi
          echo "Changed files:"
          echo "file=$CHANGED_FILES" >> $GITHUB_OUTPUT
          echo "member=$(basename "$CHANGED_FILES" .c)" >> $GITHUB_OUTPUT  # Or .bas

      - name: Upload to PDS and Submit JCL
        if: steps.files.outputs.file != ''
        run: |
          python3 mvs_job.py "${{ steps.files.outputs.file }}" "@05054.SRCLIB.C" "${{ steps.files.outputs.member }}" "COMPILE"
        env:
          MVS_HOST: "oldcomputernerd.com"

      - name: Report Status
        run: |
          echo "Upload/Compile complete! Check TK5 JES for JOB ${{ steps.files.outputs.member }} output."