#!/bin/bash

REPO_URL="https://github.com/your-org/your-repo.git" # Replace with your repository URL
TARGET_DIR="/srv/www/my-app" # Replace with your deployment target directory
BRANCH="main" # Replace with your target branch

# --- Configuration for Error Handling (similar to previous snippet) ---
set -e
set -u
set -o pipefail

log() {
  local type="$1"
  local message="$2"
  echo "$(date '+%Y-%m-%d %H:%M:%S') [GIT_DEPLOY] [${type}] ${message}"
}

error_exit() {
  log "ERROR" "An error occurred. Exiting."
  exit 1
}

trap 'error_exit' ERR

# --- Main Logic ---

log "INFO" "Starting Git deployment process for ${REPO_URL} on branch ${BRANCH}."

# Check if target directory exists and is a git repository
if [ -d "${TARGET_DIR}" ]; then
  if [ -d "${TARGET_DIR}/.git" ]; then
    log "INFO" "Repository already exists at ${TARGET_DIR}. Pulling latest changes..."
    cd "${TARGET_DIR}"
    git fetch origin
    git reset --hard "origin/${BRANCH}" # Ensures local matches remote, discards local changes
    # Alternative: git pull origin ${BRANCH} (if local changes are allowed or handled elsewhere)
    log "INFO" "Repository updated."
  else
    log "ERROR" "${TARGET_DIR} exists but is not a Git repository. Please ensure it's empty or remove it."
    exit 1
  fi
else
  log "INFO" "Target directory ${TARGET_DIR} does not exist. Cloning repository..."
  mkdir -p "${TARGET_DIR}"
  git clone --branch "${BRANCH}" "${REPO_URL}" "${TARGET_DIR}"
  log "INFO" "Repository cloned into ${TARGET_DIR}."
fi

# Optional: Perform post-deployment steps (e.g., install dependencies, restart services)
log "INFO" "Running post-deployment steps (e.g., npm install, service restart)..."
cd "${TARGET_DIR}"
# Example: Install Node.js dependencies
# if [ -f "package.json" ]; then
#   npm install --production
#   log "INFO" "Node.js dependencies installed."
# fi

# Example: Restart a service (e.g., Nginx, Gunicorn, PHP-FPM)
# sudo systemctl restart your_web_app_service
log "INFO" "Post-deployment steps completed."

log "INFO" "Git deployment process finished successfully for ${TARGET_DIR}."