#!/bin/bash
set -euo pipefail

export GIT_SSH_COMMAND="ssh -i ~/.ssh/deploy_id_rsa -o StrictHostKeyC

cd /home/ubuntu/Bgreen/sgeUpdated

echo "📦 Fetching latest changes from origin/main..."
git fetch origin main

# Detect which files changed between local HEAD and the latest remote version
CHANGED_FILES=$(git diff --name-only HEAD origin/main || true)

if [ -z "$CHANGED_FILES" ]; then
  echo "✅ No file changes detected between HEAD and origin/main."
else
  echo "🪶 Changed files:"
  echo "$CHANGED_FILES"
fi

# Update to the latest version
git reset --hard origin/main

BACKEND_CHANGED=false
FRONTEND_CHANGED=false

# Check if backend folder changed
if echo "$CHANGED_FILES" | grep -q "^sge-backend/"; then
  BACKEND_CHANGED=true
fi

# Check if frontend folder changed
if echo "$CHANGED_FILES" | grep -q "^sge-frontend/"; then
  FRONTEND_CHANGED=true
fi

# -----------------------
# Backend section
# -----------------------
if [ "$BACKEND_CHANGED" = true ]; then
  echo "⚡ Backend changes detected."
  cd sge-backend
  echo "Running Maven build..."
  /opt/apache-maven-3.9.11/bin/mvn clean install -DskipTests
  cd ..
  echo "Rebuilding backend Docker container..."
  docker compose up -d --build bgreen-backend
else
  echo "✅ No backend changes."
fi

# -----------------------
# Frontend section
# -----------------------
if [ "$FRONTEND_CHANGED" = true ]; then
  echo "⚡ Frontend changes detected."
  cd sge-frontend
  echo "Running npm build..."
  npm install
  npm run build
  cd ..
  echo "Rebuilding frontend Docker container..."
  docker compose up -d --build bgreen-frontend
else
  echo "✅ No frontend changes."
fi

echo "✅ Deployment complete."