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: Prepare environment
        id: setup
        run: |
          echo "=== Debug: Starting setup ==="
          echo "Current dir: $(pwd)"
          echo "Files in repo: $(ls -la)"
          apt-get update && apt install -y netcat-traditional
          nc -h
          echo "=== Debug: Setup complete ==="

      - name: Find changed source files
        id: files
        run: |
          echo "=== Debug: Starting file detection ==="
          echo "Current dir: $(pwd)"
          echo "Files in repo: $(ls -la)"
          echo "=== Debug: Checking for parent commit ==="
          if git rev-parse --verify HEAD~1 >/dev/null 2>&1; then
            echo "Parent commit exists; running git diff."
            CHANGED_FILES=$(git diff --name-only HEAD~1 2>/dev/null | grep -E '\.(c|bas)$' | head -1)
            echo "Changed files from last commit: '${CHANGED_FILES}'"
          else
            echo "No parent commit; skipping diff."
            CHANGED_FILES=""
          fi
          echo "=== Debug: Git diff check complete ==="
          
          # Fallback to all .c/.bas files if no changes or no previous commit
          if [ -z "$CHANGED_FILES" ]; then
            echo "=== Debug: No changes found; running fallback find ==="
            CHANGED_FILES=$(find . -type f \( -name "*.c" -o -name "*.bas" \) | head -1)
            echo "Fallback files: '${CHANGED_FILES}'"
            echo "=== Debug: Fallback complete ==="
          fi
          
          if [ -z "$CHANGED_FILES" ]; then
            echo "No C/BAS files found; skipping workflow."
            exit 0  # Graceful skip, no failure
          fi
          
          echo "=== Debug: Processing final file ==="
          echo "Final selected file: '${CHANGED_FILES}'"
          echo "file=$CHANGED_FILES" >> $GITHUB_OUTPUT
          
          # Extract member name (handle .c or .bas)
          EXT="${CHANGED_FILES##*.}"
          BASE=$(basename "$CHANGED_FILES" ".$EXT")
          echo "member=$BASE" >> $GITHUB_OUTPUT
          echo "=== Debug: File detection complete ==="

      - name: Upload to PDS and Submit JCL
        if: steps.files.outputs.file != ''
        run: |
          echo "=== Debug: Starting upload/submit ==="
          echo "File: ${{ steps.files.outputs.file }}"
          echo $(/usr/bin/stat ${{ steps.files.outputs.file }})
          echo $(nc -h)
          echo "Member: ${{ steps.files.outputs.member }}"
          python3 mvs_job.py "${{ steps.files.outputs.file }}" "@05054.SRCLIB.C" "${{ steps.files.outputs.member }}" "COMPILE"
          echo "=== Debug: Upload/submit complete ==="
        env:
          MVS_HOST: "oldcomputernerd.com"

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