#!/bin/bash

# This script assumes you're in the monorepo root directory.
# It will:
# - Remove nested .git folders
# - Remove subproject .gitignore files (if present)
# - Optionally create or update the workspace Cargo.toml
# - Add the projects to your root Git repo

set -e

echo "🔧 Flattening nested Rust projects into a monorepo..."

# Gather all Rust subprojects
projects=()
for dir in */Cargo.toml; do
  project=$(dirname "$dir")
  projects+=("$project")

  # Remove nested Git repo
  if [ -d "$project/.git" ]; then
    echo "❌ Removing nested Git repo in $project"
    rm -rf "$project/.git"
  fi

  # Optionally remove local .gitignore (you can comment this out if needed)
  if [ -f "$project/.gitignore" ]; then
    echo "❌ Removing $project/.gitignore"
    rm -f "$project/.gitignore"
  fi
done

# Create .gitignore in root if missing
if [ ! -f .gitignore ]; then
  echo "📄 Creating root .gitignore"
  cat > .gitignore <<EOF
**/target/
**/*.o
**/*.d
**/*.exe
**/*.log
**/*.rlib
**/*.dylib
**/*.so
**/.DS_Store
**/.vscode/
**/.idea/
EOF
fi

# Create root Cargo.toml workspace
if [ ! -f Cargo.toml ]; then
  echo "📄 Creating root Cargo.toml"
  echo "[workspace]" > Cargo.toml
  echo "members = [" >> Cargo.toml
  for project in "${projects[@]}"; do
    echo "  \"$project\"," >> Cargo.toml
  done
  echo "]" >> Cargo.toml
else
  echo "⚠️  Cargo.toml already exists at root. You may need to manually add workspace members."
fi

# Init root Git repo if not already
if [ ! -d .git ]; then
  echo "🔁 Initializing new root Git repo"
  git init
fi

# Add and commit
git add .
git commit -m "Flatten nested Rust projects into monorepo"

echo "✅ Done! Monorepo is clean and ready."