#!/bin/bash
set -euo pipefail

cd /home/ubuntu/Bgreen/sgeUpdated

# -----------------------
# Harbor settings
# -----------------------
HARBOR_REGISTRY="10.150.1.166"
HARBOR_PROJECT="bgreen"

BACKEND_IMAGE_REPO="${HARBOR_REGISTRY}/${HARBOR_PROJECT}/bgreen-backend"
FRONTEND_IMAGE_REPO="${HARBOR_REGISTRY}/${HARBOR_PROJECT}/bgreen-frontend"

# Tag images with git commit (better than latest; enables rollback)
VERSION="$(git rev-parse --short HEAD)"

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

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

BACKEND_CHANGED=false
FRONTEND_CHANGED=false

# Check if backend folder changed (excluding README.md)
if echo "$CHANGED_FILES" | grep "^sge-backend/" | grep -qv "README.md$"; then
  BACKEND_CHANGED=true
fi

# Check if frontend folder changed (excluding README.md)
if echo "$CHANGED_FILES" | grep "^sge-frontend/" | grep -qv "README.md$"; 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

  echo "🐳 Building backend Docker image..."
  docker build -t "${BACKEND_IMAGE_REPO}:${VERSION}" .

  echo "📤 Pushing backend image to Harbor..."
  docker push "${BACKEND_IMAGE_REPO}:${VERSION}"

  echo "📥 Pulling backend image from Harbor (to ensure registry is source of truth)..."
  docker pull "${BACKEND_IMAGE_REPO}:${VERSION}"

  cd ..

  echo "🚀 Recreating backend container using Harbor image..."
  VERSION="$VERSION" docker compose up -d bgreen-backend

else
  echo "✅ No backend changes."
fi

# -----------------------
# Frontend section
# -----------------------
if [ "$FRONTEND_CHANGED" = true ]; then
  echo "⚡ Frontend changes detected."
  cd sge-frontend

  # Check if package.json or package-lock.json changed
  if echo "$CHANGED_FILES" | grep -qE "^sge-frontend/(package\.json|package-lock\.json)$"; then
    echo "📦 package.json changed. Running 'npm install' and 'npm run build'..."
    npm install
    npm run build
  else
    echo "📦 only code changes. Running 'npm run build'..."
    npm run build
  fi

  echo "🐳 Building frontend Docker image..."
  docker build -t "${FRONTEND_IMAGE_REPO}:${VERSION}" .

  echo "📤 Pushing frontend image to Harbor..."
  docker push "${FRONTEND_IMAGE_REPO}:${VERSION}"

  echo "📥 Pulling frontend image from Harbor (to ensure registry is source of truth)..."
  docker pull "${FRONTEND_IMAGE_REPO}:${VERSION}"

  cd ..

  echo "🚀 Recreating frontend container using Harbor image..."
  VERSION="$VERSION" docker compose up -d bgreen-frontend

else
  echo "✅ No frontend changes."
fi

echo "✅ Deployment complete."