name: RTL/LTR Markdown Linter

on: [pull_request]

permissions:
  contents: read # Required to checkout the repository content

jobs:
  lint:
    runs-on: ubuntu-latest

    steps:
    # Checkout the repository code
    - name: Checkout code
      uses: actions/checkout@v5

    # Fetch the full history of 'main' for accurate git diff in PRs
    - name: Fetch all history for main
      run: git fetch --no-tags --prune --depth=50 origin main

    # Set up the required Python version for the linter
    - name: Set up Python
      uses: actions/setup-python@v6
      with:
        python-version: '3.11' # Use a recent Python version for compatibility

    # Install only the Python dependencies needed for the linter script
    - name: Install Python dependencies
      run: |
        pip install python-bidi PyYAML

    # (Optional) List files for debugging purposes
    - name: List files in scripts directory and current path
      run: |
        echo "Current working directory:"
        pwd
        echo "Listing contents of scripts directory (if it exists at root):"
        ls -la scripts/ || echo "scripts/ directory not found at root or ls failed"

    # Identify all changed Markdown files in the PR using tj-actions/changed-files
    - name: Get changed Markdown files
      id: changed_md_files
      uses: tj-actions/changed-files@v46
      with:
        files: |
          **/*.md

    # Check if the PR has the "RTL" label
    - name: Check for RTL label
      id: rtl_label
      run: |
        gh pr view ${{ github.event.pull_request.number }} --json labels --jq '.labels[].name' | grep -q '^RTL$' && echo "has_labels=true" >> $GITHUB_OUTPUT || echo "has_labels=false" >> $GITHUB_OUTPUT
      env:
        GH_TOKEN: ${{ github.token }}
      
    # Check if any changed file is in ar, he, fa, ur
    - name: Check for RTL language file changes
      id: rtl_lang_files
      run: |
        RTL_CHANGED=false
        for f in ${{ steps.changed_md_files.outputs.all_changed_files }}; do
          if [[ "$f" =~ (ar|he|fa|ur) ]]; then
            RTL_CHANGED=true
            break
          fi
        done
        echo "rtl_changed=$RTL_CHANGED" >> $GITHUB_OUTPUT

    # Run the RTL/LTR Markdown linter:
    # - Scans all Markdown files for issues and writes a full log
    # - Prints GitHub Actions annotations only for issues on changed lines in changed files
    # - Fails the job if any error or warning is found on changed lines
    - name: Run RTL/LTR Markdown linter
      id: run_linter
      if: steps.rtl_label.outputs.has_labels == 'true' || steps.rtl_lang_files.outputs.rtl_changed == 'true'
      continue-on-error: true
      run: |
        echo "Scanning all specified paths for full log..."
        echo "Changed Markdown files for PR annotations: ${{ steps.changed_md_files.outputs.all_changed_files }}"
        
        CHANGED_FILES_ARGS=""
        if [ "${{ steps.changed_md_files.outputs.all_changed_files_count }}" -gt 0 ]; then
          # Pass changed files to the script for PR annotation generation
          CHANGED_FILES_ARGS="--changed-files ${{ steps.changed_md_files.outputs.all_changed_files }}"
        fi
        
        # Execute the linter.
        # Annotations for changed files will be printed to stdout by the script.
        # The script will also write a full log to 'rtl-linter-output.log'.
        # If the script exits with a non-zero code (error found), this step will fail.
        python3 scripts/rtl_ltr_linter.py books casts courses more ${CHANGED_FILES_ARGS} --log-file rtl-linter-output.log
    
    # Upload the linter output log as a workflow artifact
    # Only if the linter step was executed (success or failure)
    - name: Upload linter output artifact
      if: steps.run_linter.conclusion == 'success' || steps.run_linter.conclusion == 'failure'
      uses: actions/upload-artifact@v7
      with:
        name: rtl-linter-output # Name of the artifact
        path: rtl-linter-output.log # Path to the output file
        if-no-files-found: ignore # Ignore if no files are found