#!/usr/bin/env bash
set -euo pipefail

PUBSPEC="pubspec.yaml"
if [[ ! -f "$PUBSPEC" ]]; then
  echo "No $PUBSPEC found in $(pwd); skipping version bump"
  exit 0
fi

# Read version line
ver_line=$(grep -E '^version:\s*' "$PUBSPEC" || true)
if [[ -z "$ver_line" ]]; then
  echo "No version line found in $PUBSPEC; skipping"
  exit 0
fi

# Extract version string (e.g., 1.2.3 or 1.2.3+4)
if [[ "$ver_line" =~ ([0-9]+)\.([0-9]+)\.([0-9]+)(\+[0-9]+)? ]]; then
  major=${BASH_REMATCH[1]}
  minor=${BASH_REMATCH[2]}
  patch=${BASH_REMATCH[3]}
  build=${BASH_REMATCH[4]:-}
else
  echo "Failed to parse version from: $ver_line"
  exit 0
fi

newpatch=$((patch + 1))
if [[ -n "$build" ]]; then
  newver="${major}.${minor}.${newpatch}${build}"
else
  newver="${major}.${minor}.${newpatch}"
fi

# Replace the first 'version:' line with the new version preserving leading whitespace
tmpfile=$(mktemp)
awk -v newver="$newver" 'BEGIN{re="^[[:space:]]*version:[[:space:]]*"} { if($0 ~ re && !done){ sub(re, substr($0,1,index($0,":"))+"version: " newver); done=1 } print }' "$PUBSPEC" > "$tmpfile"
# Fallback: simpler replace if awk didn't work
if ! grep -q "version: $newver" "$tmpfile"; then
  sed -E "0,/^([[:space:]]*)version:/s//\1version: $newver/" "$PUBSPEC" > "$tmpfile"
fi

# Move replacement into place
mv "$tmpfile" "$PUBSPEC"

# Stage the change so it is included in the commit
if git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
  git add "$PUBSPEC" || true
fi

echo "pubspec version bumped to $newver"