name: Sync README files to Wiki

on:
  push:
    branches: [ main ]
    paths:
      - '**/README.md'
      - '**/readme.md'

permissions:
  contents: write
      
jobs:
  sync-wiki:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      
      - name: Configure Git for Wiki
        run: |
          git config --global user.name "GitHub Actions"
          git config --global user.email "actions@github.com"
      
      - name: Clone Wiki Repository
        run: git clone https://${{ github.actor }}:${{ secrets.GITHUB_TOKEN }}@github.com/${{ github.repository }}.wiki.git ./wiki
      
      - name: Copy README files to Wiki
        run: |
          # Special mappings - add specific README files to specific wiki pages
          declare -A special_mappings
          special_mappings["benchmarks/rotatingDrum/readme.md"]="Performance-of-phasicFlow.md"
          
          # Create an images directory in the wiki if it doesn't exist
          mkdir -p ./wiki/images
          
          # Process mapped files
          for rel_path in "${!special_mappings[@]}"; do
            if [ -f "./$rel_path" ]; then
              wiki_page="${special_mappings[$rel_path]}"
              echo "Processing special mapping: $rel_path -> $wiki_page"
              
              # Get the base directory of the readme file
              base_dir=$(dirname "./$rel_path")
              
              # Read content of the README file
              content=$(cat "./$rel_path")
              
              # Use grep to identify and process image paths instead of regex
              echo "Processing Markdown image references..."
              for img_ref in $(grep -o '!\[.*\](.*[^)]*)' "./$rel_path" | sed -E 's/!\[.*\]\((.*)\)/\1/'); do
                # Skip URLs
                if [[ $img_ref == http* ]]; then
                  continue
                fi
                
                # Process markdown image as before
                if [[ $img_ref == /* ]]; then
                  # Absolute path within repository
                  abs_img_path="./$img_ref"
                else
                  # Relative path to the README
                  abs_img_path="$base_dir/$img_ref"
                fi
                
                # Extract just the filename
                img_filename=$(basename "$img_ref")
                wiki_img_path="images/$img_filename"
                
                # Copy the image to wiki repository if it exists
                if [ -f "$abs_img_path" ]; then
                  echo "Copying image: $abs_img_path -> ./wiki/$wiki_img_path"
                  cp -v "$abs_img_path" "./wiki/$wiki_img_path" || echo "Error copying image"
                  
                  # Escape special characters in the path for sed
                  escaped_img_path=$(echo "$img_ref" | sed 's/[\/&]/\\&/g')
                  
                  # Replace the image reference in content - simpler approach with sed
                  content=$(echo "$content" | sed "s|!\\[.*\\]($escaped_img_path)|![\\1]($wiki_img_path)|g")
                  echo "Replaced image reference: $img_ref → $wiki_img_path"
                else
                  echo "Warning: Image file not found: $abs_img_path"
                  # Add more debug info
                  echo "Current directory: $(pwd)"
                  echo "Files in $base_dir:"
                  ls -la "$base_dir"
                fi
              done
              
              # Process HTML img tags separately
              echo "Processing HTML image references..."
              
              # Create temporary files
              temp_file=$(mktemp)
              echo "$content" > "$temp_file"
              
              # Create perl script file
              perl_script=$(mktemp)
              
              # Write perl script content - using proper YAML block scalar syntax
              cat > "$perl_script" << EOL
#!/usr/bin/perl
use strict;
use warnings;

my \$content = do { local \$/; <STDIN> };

# Process HTML img tags
while (\$content =~ m|(<img\\s+[^>]*?src=")([^"]+)("[^>]*?>)|g) {
    my \$prefix = \$1;
    my \$src = \$2;
    my \$suffix = \$3;
    my \$tag = \$prefix . \$src . \$suffix;
    
    # Skip URLs
    next if \$src =~ /^http/;
    
    # Get just the filename
    my \$filename = \$src;
    \$filename =~ s/.*\\///;
    my \$new_path = "images/" . \$filename;
    
    # Replace in content
    my \$new_tag = \$prefix . \$new_path . \$suffix;
    \$content =~ s/\\Q\$tag\\E/\$new_tag/g;
}

print \$content;
EOL
              
              # Process content with perl script
              cat "$temp_file" | perl "$perl_script" > "${temp_file}.new"
              content=$(cat "${temp_file}.new")

              # Clean up temporary files
              rm "$temp_file" "${temp_file}.new" "$perl_script"

              # Now copy all the images referenced in HTML tags
              for img_src in $(grep -o '<img [^>]*src="[^"]*"' "./$rel_path" | sed -E 's/.*src="([^"]*)".*/\1/'); do
                # Skip URLs
                if [[ $img_src == http* ]]; then
                  continue
                fi

                # Determine the absolute path of the image
                if [[ $img_src == /* ]]; then
                  abs_img_path="./$img_src"
                else
                  abs_img_path="$base_dir/$img_src"
                fi

                # Extract just the filename
                img_filename=$(basename "$img_src")
                wiki_img_path="images/$img_filename"

                # Copy the image to wiki repository if it exists
                if [ -f "$abs_img_path" ]; then
                  echo "Copying image: $abs_img_path -> ./wiki/$wiki_img_path"
                  cp -v "$abs_img_path" "./wiki/$wiki_img_path" || echo "Error copying image"
                else
                  echo "Warning: HTML image file not found: $abs_img_path"
                fi
              done
              
              # Debug output
              echo "Wiki page content preview (first 100 chars): ${content:0:100}"
              
              # Replace the wiki page with the updated content rather than appending
              mkdir -p "$(dirname "./wiki/$wiki_page")" # Ensure directory exists
              echo -e "# $(basename "$wiki_page" .md)\n\n$content" > "./wiki/$wiki_page"
              echo "Updated wiki page: $wiki_page"
            fi
          done
      
      - name: Commit and Push to Wiki
        working-directory: ./wiki
        run: |
          echo "Files changed in wiki repository:"
          git status
          git add .
          git diff-index --quiet HEAD || git commit -m "Sync README files from main repository"
          git push || { echo "Push failed, retrying with more details..."; git push --verbose; }