#!/bin/bash
# ==============================================================================
# Wallarm PoC: Interactive "KISS" Deployer (Keystone Bank Edition)
# ==============================================================================

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

clear
echo -e "${YELLOW}====================================================${NC}"
echo -e "${YELLOW}      Wallarm Guided Instance Deployer (US Cloud)   ${NC}"
echo -e "${YELLOW}====================================================${NC}\n"

# --- 1. THE ID (The "Magic Number") ---
echo -e "Existing Instances in /opt/wallarm/:"
ls /opt/wallarm/ 2>/dev/null || echo "None"
echo ""

read -p "Enter Instance ID number (e.g., 1, 2, 3): " INSTANCE_ID

# Auto-generate naming and ports
NODE_NAME=$(printf "wallarm-%02d" $INSTANCE_ID)
TRAFFIC_PORT=$((8000 + INSTANCE_ID))
MONITOR_PORT=$((9000 + INSTANCE_ID))

# --- 2. CONFIGURATION ---
read -p "Enter Upstream IP (App Server): " UPSTREAM_IP
read -p "Enter Upstream Port [default 80]: " UPSTREAM_PORT
UPSTREAM_PORT=${UPSTREAM_PORT:-80}

# Hardcoded to US based on your tip
REGION="US"
API_HOST="us1.api.wallarm.com"

read -p "Paste Wallarm Token (US Cloud): " TOKEN

# --- 3. PRE-FLIGHT VALIDATION ---
echo -e "\n${YELLOW}🔍 Starting Pre-Flight Connectivity Checks...${NC}"

# A. Internal Check (Upstream)
echo -n "Checking App Server ($UPSTREAM_IP:$UPSTREAM_PORT)... "
if ! timeout 2 bash -c "cat < /dev/null > /dev/tcp/$UPSTREAM_IP/$UPSTREAM_PORT" 2>/dev/null; then
    echo -e "${RED}FAILED${NC}"
    echo -e "${RED}❌ ERROR: VM cannot reach internal app server.${NC}"; exit 1
else
    echo -e "${GREEN}OK${NC}"
fi

# B. External Check (Wallarm Cloud)
echo -n "Checking Wallarm US Cloud ($API_HOST)... "
if ! curl -s --connect-timeout 5 "https://$API_HOST" > /dev/null; then
    echo -e "${RED}FAILED${NC}"
    echo -e "${RED}❌ ERROR: VM cannot talk to Wallarm US Cloud.${NC}"
    echo -e "${YELLOW}Action: Check Bank Proxy or Firewall egress for port 443.${NC}"; exit 1
else
    echo -e "${GREEN}OK${NC}"
fi

# --- 4. ENGINE SETUP ---
echo -e "\n${YELLOW}🛠️  Ensuring Engine (Podman/Docker) is ready...${NC}"
if [ -f /etc/redhat-release ]; then
    ENGINE="podman"
    dnf install -y epel-release podman podman-docker podman-compose wget curl &>/dev/null
    systemctl enable --now podman.socket &>/dev/null
    firewall-cmd --permanent --add-port=$TRAFFIC_PORT/tcp --add-port=$MONITOR_PORT/tcp &>/dev/null
    firewall-cmd --reload &>/dev/null
else
    ENGINE="docker"
    apt update && apt install -y docker.io docker-compose wget curl &>/dev/null
    systemctl enable --now docker &>/dev/null
fi
COMPOSE_CMD=$([[ "$ENGINE" == "podman" ]] && echo "podman-compose" || echo "docker-compose")

# --- 5. WORKSPACE & CONFIG ---
INSTANCE_DIR="/opt/wallarm/$NODE_NAME"
mkdir -p "$INSTANCE_DIR"

cat <<EOF > "$INSTANCE_DIR/nginx.conf"
server {
    listen 80;
    wallarm_mode monitoring; # Set to monitoring for PoC safety
    location / {
        proxy_pass http://$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;
    }
}
server { 
    listen 90; 
    location /wallarm-status { 
        wallarm_status on; 
        allow all; 
    } 
}
EOF

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

# --- 6. LAUNCH ---
echo -e "${YELLOW}🚀 Launching $NODE_NAME...${NC}"
cd "$INSTANCE_DIR"
$COMPOSE_CMD -f conf.yml up -d

# --- 7. POST-DEPLOY VERIFICATION ---
echo -e "\n${YELLOW}⏳ Waiting 5s for handshake...${NC}"
sleep 5
echo -en "Checking instance status page... "
if curl -s "http://localhost:$MONITOR_PORT/wallarm-status" | grep -q "requests"; then
    echo -e "${GREEN}SUCCESS${NC}"
else
    echo -e "${RED}WARNING: Status page not responding yet.${NC}"
fi

echo -e "\n${GREEN}✅ DEPLOYMENT FINISHED${NC}"
echo -e "--------------------------------------------------"
echo -e "Instance Name:  $NODE_NAME"
echo -e "Traffic Port:   $TRAFFIC_PORT"
echo -e "Monitor Port:   $MONITOR_PORT"
echo -e "Logs Command:   $ENGINE logs -f $NODE_NAME"
echo -e "--------------------------------------------------"