#!/bin/sh

# Get the directory of the current page
current_dir=$(dirname "$ZS_SOURCE_FILE")

# Remove leading './' if present
case "$current_dir" in
./*) current_dir="${current_dir#./}" ;;
esac

# Initialize the navigation HTML with the 'Home' link
if [ "$ZS_URL" = "index.html" ]; then
  nav_html="<li><a href=\"/index.html\" class=\"active\">Home</a></li>"
else
  nav_html="<li><a href=\"/\">Home</a></li>"
fi

# Create a temporary file to store filenames
tmpfile=$(mktemp)

# Find all Markdown files in the current directory, excluding 'README.md' and 'index.md'
find "$current_dir" -maxdepth 1 -type f -name "*.md" ! -name "README.md" ! -name "index.md" -print >"$tmpfile"

# Sort the files alphabetically
sort "$tmpfile" >"${tmpfile}.sorted"

# Read each file and process
while IFS= read -r md_file; do
  # Get the base filename without extension
  base_name=$(basename "$md_file" .md)

  # Replace hyphens and underscores with spaces for display
  display_name=$(echo "$base_name" | tr '-' ' ' | tr '_' ' ')

  # Capitalize the first letter of each word using awk
  display_name=$(echo "$display_name" | awk '{ for (i=1; i<=NF; i++) { $i = toupper(substr($i,1,1)) substr($i,2) } print }')

  # Construct the link href relative to the site root
  if [ "$current_dir" = "." ]; then
    href="/${base_name}.html"
  else
    href="/${current_dir}/${base_name}.html"
  fi

  # Append the navigation item
  if [ "$ZS_URL" = "$base_name.html" ]; then
    nav_html="${nav_html}<li><a href=\"${href}\" class=\"active\">${display_name}</a></li>"
  else
    nav_html="${nav_html}<li><a href=\"${href}\">${display_name}</a></li>"
  fi
done <"${tmpfile}.sorted"

# Remove temporary files
rm -f "$tmpfile" "${tmpfile}.sorted"

# Output the navigation HTML
echo "$nav_html"