run.sh

#!/bin/bash

# --- Configuration ---
set -euo pipefail

# --- Define Project Root ---
SCRIPT_DIR=$(unset CDPATH && cd "$(dirname "$0")" && pwd)
PROJECT_ROOT="${SCRIPT_DIR}"
export PROJECT_ROOT

echo "Project root detected at: ${PROJECT_ROOT}"

# Define script usage (now includes more actions)
usage() {
  echo "Usage: $0 <action> [options]"
  echo "Actions:"
  echo "  apply             - Builds AMI with Packer and applies Terraform infrastructure."
  echo "  destroy           - Destroys Terraform infrastructure."
  echo "  up-bastion        - Creates the temporary bastion host using Terraform."
  echo "  down-bastion      - Destroys the temporary bastion host using Terraform."
  echo "  update-efs-file   - Updates a specified file on EFS via the bastion host."
  echo "                      Usage: $0 update-efs-file <local_file_path> <efs_relative_path>"
  echo "                      <local_file_path>: Path to the local file to upload (e.g., 'web/index.html')"
  echo "                      <efs_relative_path>: Relative path on EFS (e.g., 'terraform-aws-with-autoscaling-course/html/index.html')"
  echo "                      Note: This action will automatically create the bastion if it doesn't exist, and tear it down afterwards."
  exit 1
}

# Check if an argument is provided or help is requested
if [ -z "${1:-}" ] || [ "${1:-}" = "--help" ] || [ "${1:-}" = "-h" ]; then
  usage
fi

ACTION="$1"
shift # Remove the action from arguments, so remaining arguments are for the action


loadSource() {
  # --- Source Common Utilities and Action Scripts ---
  source "${PROJECT_ROOT}/scripts/utils.sh"
  source "${PROJECT_ROOT}/scripts/packer_actions.sh"
  source "${PROJECT_ROOT}/scripts/terraform_actions.sh"
  source "${PROJECT_ROOT}/scripts/efs_actions.sh"
}

# --- 1. Environment Preparation ---
preparingEnvironment() {
  echo "--- 1. Preparing the Environment ---"

  # Check for .env file and load variables
  if [ ! -f "${PROJECT_ROOT}/.env" ]; then
    echo "Error: .env file not found. Please rename .env.example to .env and configure it."
    exit 1
  fi
  echo "Loading environment variables from .env..."
  set -a # Export all variables
  source "${PROJECT_ROOT}/.env"
  set +a # Disable auto-export

  # Validate required environment variables
  REQUIRED_VARS=("TF_BACKEND_BUCKET" "TF_BACKEND_KEY" "TF_BACKEND_REGION" "TF_AWS_LOCK_DYNAMODB_TABLE"
                  "TF_VAR_USERNAME" "TF_VAR_PROJECT_NAME" "TF_VAR_ENVIRONMENT" "TF_VAR_SSH_KEY_NAME")
  for VAR_NAME in "${REQUIRED_VARS[@]}"; do
    if [ -z "${!VAR_NAME:-}" ]; then
      echo "Error: Required environment variable '$VAR_NAME' is not set in .env"
      exit 1
    fi
  done

  echo "Environment variables loaded successfully."
}

# --- 2. Select Action ---
selectAction() {
  echo "--- 2. Selecting Action: $ACTION ---"

  case "$ACTION" in
    apply)
      echo "Selected action: apply"
      execute_packer_build
      execute_terraform_apply false
      ;;

    destroy)
      echo "Selected action: destroy"
      execute_terraform_destroy false
      ;;

    up-bastion)
      echo "Selected action: up-bastion"
      execute_terraform_apply true
      ;;

    down-bastion)
      echo "Selected action: down-bastion"
      execute_terraform_apply false
      ;;

    update-efs-file)
      echo "Selected action: update-efs-file"
      execute_efs_file_update "$@" 
      ;;

    *)
      echo "Error: Invalid action '$ACTION'."
      usage
      ;;
  esac

}

# --- Main Script Execution ---
main() {
  echo "--- Starting Script Execution ---"
  loadSource
  preparingEnvironment
  selectAction "$@"
  echo "--- Script Execution Completed ---"
}
main "$@"