#!/bin/bash
# ==============================================================================
# Wallarm PoC: Multi-Instance Safe Deployer (Podman/Docker)
# ==============================================================================

# --- Instance Configuration ---
NODE_NAME="wallarm-01"         
TRAFFIC_PORT="8000"            
MONITOR_PORT="9000"            

# --- UPSTREAM SETTINGS ---
UPSTREAM_IP="10.0.0.14"        # Internal Application IP
UPSTREAM_PORT="6042"          # Internal Application Port

# --- CLOUD SETTINGS ---
TOKEN="YOUR_NODE_TOKEN_HERE"   
REGION="EU"                    # US or EU

# --- Colors ---
YELLOW='\033[1;33m'
GREEN='\033[0;32m'
RED='\033[0;31m'
NC='\033[0m'

echo -e "${YELLOW}🔍 PHASE 0: Pre-Flight Connectivity Checks...${NC}"

# 1. Root Check
[[ $EUID -ne 0 ]] && { echo -e "${RED}❌ ERROR: Run as root.${NC}"; exit 1; }

# 2. Specific Upstream Port Check
echo -n "Verifying connectivity to $UPSTREAM_IP on port $UPSTREAM_PORT... "
if ! timeout 3 bash -c "cat < /dev/null > /dev/tcp/$UPSTREAM_IP/$UPSTREAM_PORT" 2>/dev/null; then
    echo -e "${RED}FAILED${NC}"
    echo -e "${RED}❌ ERROR: The VM cannot reach the application on port $UPSTREAM_PORT.${NC}"
    echo -e "${YELLOW}Action: Ask the bank's Network Team to open egress to $UPSTREAM_IP:$UPSTREAM_PORT.${NC}"
    exit 1
else
    echo -e "${GREEN}OK${NC}"
fi

# 3. Wallarm Cloud Check
API_HOST=$( [[ "$REGION" == "US" ]] && echo "us1.api.wallarm.com" || echo "api.wallarm.com" )
if ! curl -s --connect-timeout 5 "https://$API_HOST" > /dev/null; then
    echo -e "${RED}❌ ERROR: Cannot reach Wallarm Cloud ($API_HOST). Check Proxy settings.${NC}"
    exit 1
fi

# --- PHASE 1: Engine Setup ---
if [ -f /etc/redhat-release ]; then
    ENGINE="podman"
    dnf install -y epel-release
    dnf install -y podman podman-docker podman-compose wget curl
    systemctl enable --now podman.socket
    # Open OS Firewalld for incoming traffic
    firewall-cmd --permanent --add-port=$TRAFFIC_PORT/tcp
    firewall-cmd --permanent --add-port=$MONITOR_PORT/tcp
    firewall-cmd --reload
elif [ -f /etc/debian_version ]; then
    ENGINE="docker"
    apt update && apt install -y docker.io docker-compose wget curl
    systemctl enable --now docker
else
    echo -e "${RED}❌ Unsupported OS${NC}"; exit 1
fi

COMPOSE_CMD=$([[ "$ENGINE" == "podman" ]] && echo "podman-compose" || echo "docker-compose")

# --- PHASE 2: Instance Workspace ---
INSTANCE_DIR="/opt/wallarm/$NODE_NAME"
mkdir -p "$INSTANCE_DIR"

# Generate Nginx Config using the specific Upstream Port
cat <<EOF > "$INSTANCE_DIR/nginx.conf"
server {
    listen 80;
    wallarm_mode monitoring;
    
    location / {
        proxy_pass http://$UPSTREAM_IP:$UPSTREAM_PORT;
        proxy_set_header Host \$host;
        proxy_set_header X-Real-IP \$remote_addr;
        proxy_set_header X-Forwarded-For \$proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto \$scheme;
    }
}
server {
    listen 90;
    location /wallarm-status {
        wallarm_status on;
        allow all;
    }
}
EOF

# Compose File with SELinux ( :Z ) flag
cat <<EOF > "$INSTANCE_DIR/conf.yml"
version: '3.8'
services:
  $NODE_NAME:
    image: docker.io/wallarm/node:4.10-latest
    container_name: $NODE_NAME
    restart: always
    ports:
      - "$TRAFFIC_PORT:80"
      - "$MONITOR_PORT:90"
    environment:
      - WALLARM_API_TOKEN=$TOKEN
      - WALLARM_API_HOST=$API_HOST
    volumes:
      - ./nginx.conf:/etc/nginx/http.d/default.conf:ro,Z
EOF

# --- PHASE 3: Launch ---
echo -e "${YELLOW}🚀 Launching Wallarm Instance...${NC}"
cd "$INSTANCE_DIR"
$COMPOSE_CMD -f conf.yml up -d

echo -e "\n${GREEN}✅ DEPLOYMENT COMPLETE${NC}"
echo -e "External Port: $TRAFFIC_PORT -> Internal: $UPSTREAM_IP:$UPSTREAM_PORT"
echo -e "View real-time logs: $ENGINE logs -f $NODE_NAME"