#!/bin/bash

# ==============================================================================
# NGINX CONFIG DEPLOYMENT SCRIPT
#
# This script securely copies NGINX configuration files to a remote server
# using an SSH key for authentication.
#
# INSTRUCTIONS:
# 1. Edit the `REMOTE_USER` and `REMOTE_HOST` variables below.
# 2. Place this script in the same directory as your `nginx.conf` file
#    and your `sites-available` folder.
# 3. Make the script executable with: chmod +x <script_name>.sh
# 4. Run the script with: ./<script_name>.sh
# ==============================================================================

# --- Configuration ---
# PLEASE EDIT THESE TWO VARIABLES with your server details.
REMOTE_USER="ubuntu"      # Example: ubuntu, ec2-user, root
REMOTE_HOST="3.9.182.122"  # Example: 192.168.1.100 or my-server.com

# --- File & Path Definitions ---
# Path to your private SSH key.
# The '~' symbol represents your home directory.
KEY_FILE="~/repos/azeem-macbookair.pem"

# Source files and directory.
# These are expected to be in the same directory as this script.
# Note: I've corrected the spelling of 'sites-available' for you.
SOURCE_NGINX_CONF="nginx.conf"
SOURCE_SITES_DIR="sites-available"

# Destination paths on the remote server.
DEST_NGINX_PATH="/etc/nginx/"
DEST_SITES_PATH="/etc/nginx/sites-available/"

# --- Script Logic ---

echo "🚀 Starting NGINX configuration deployment to $REMOTE_HOST..."
echo "--------------------------------------------------------"

# Expand the tilde (~) in the key file path to an absolute path.
# This is necessary because scp might not expand '~' correctly otherwise.
EVAL_KEY_FILE=$(eval echo "$KEY_FILE")

# --- Pre-flight Checks ---
# Check 1: Ensure the SSH key file exists.
if [ ! -f "$EVAL_KEY_FILE" ]; then
    echo "❌ ERROR: SSH key not found at $EVAL_KEY_FILE"
    echo "Please ensure the path in the KEY_FILE variable is correct."
    exit 1
fi

# Check 2: Ensure the main nginx.conf file exists.
if [ ! -f "$SOURCE_NGINX_CONF" ]; then
    echo "❌ ERROR: Source file '$SOURCE_NGINX_CONF' not found in this directory."
    exit 1
fi

# Check 3: Ensure the sites-available directory exists.
if [ ! -d "$SOURCE_SITES_DIR" ]; then
    echo "❌ ERROR: Source directory '$SOURCE_SITES_DIR' not found."
    echo "Note: The script expects this directory to be named 'sites-available'."
    exit 1
fi

# --- File Transfer Operations ---

# Step 1: Transfer the main nginx.conf file.
echo "- Transferring '$SOURCE_NGINX_CONF' to $DEST_NGINX_PATH..."
scp -i "$EVAL_KEY_FILE" "$SOURCE_NGINX_CONF" "${REMOTE_USER}@${REMOTE_HOST}:${DEST_NGINX_PATH}"

# Check if the last command (scp) was successful.
if [ $? -ne 0 ]; then
    echo "❌ ERROR: Failed to transfer '$SOURCE_NGINX_CONF'. Aborting."
    exit 1
fi
echo "  ✅ Success."
echo

# Step 2: Transfer the contents of the sites-available directory.
# The '-r' flag is for recursive copy (required for directories).
# The '/*' at the end of the source path copies the *contents* of the directory.
echo "- Transferring all files from '$SOURCE_SITES_DIR/' to $DEST_SITES_PATH..."
scp -i "$EVAL_KEY_FILE" -r "${SOURCE_SITES_DIR}/"* "${REMOTE_USER}@${REMOTE_HOST}:${DEST_SITES_PATH}"

if [ $? -ne 0 ]; then
    echo "❌ ERROR: Failed to transfer contents of '$SOURCE_SITES_DIR'. Aborting."
    exit 1
fi
echo "  ✅ Success."
echo

# --- Completion ---
echo "--------------------------------------------------------"
echo "🎉 Deployment complete! All files transferred successfully."