#!/usr/bin/env bash
# compare-drafts -- compare two manuscript versions
set -euo pipefail
old="${1:?Usage: compare-drafts <old.md> <new.md>}"
new="${2:?Usage: compare-drafts <old.md> <new.md>}"

echo "=== WORD COUNT ==="
old_wc=$(wc -w < "$old")
new_wc=$(wc -w < "$new")
diff_wc=$((new_wc - old_wc))
echo "Old: $old_wc | New: $new_wc | Net: $diff_wc"

echo ""
echo "=== WORD-LEVEL DIFF (first 80 lines) ==="
git diff --no-index --word-diff=color "$old" "$new" 2>/dev/null | head -80 || true

echo ""
if command -v pandiff &>/dev/null; then
    echo "=== GENERATING TRACK CHANGES DOCX ==="
    pandiff "$old" "$new" -o "changes-$(date +%Y%m%d).docx"
    echo "Created changes-$(date +%Y%m%d).docx"
fi