#!/bin/bash
# NATS-Pulsar Bridge Startup Script - SignalCore CommsOps

# Configuration
BRIDGE_DIR="/data/adaptai/platform/signalcore/commsops"
LOG_FILE="$BRIDGE_DIR/bridge.log"
CONFIG_FILE="$BRIDGE_DIR/bridge_config.json"
PYTHON_SCRIPT="$BRIDGE_DIR/nats_pulsar_bridge.py"
VENV_PATH="/opt/commsops-venv"

# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m' # No Color

# Log function
log() {
    echo -e "$(date '+%Y-%m-%d %H:%M:%S') - $1" | tee -a "$LOG_FILE"
}

# Error function
error() {
    echo -e "${RED}$(date '+%Y-%m-%d %H:%M:%S') - ERROR: $1${NC}" | tee -a "$LOG_FILE"
    exit 1
}

# Check if running as root
if [ "$EUID" -eq 0 ]; then
    error "Please do not run as root"
fi

# Check dependencies
check_dependencies() {
    log "Checking dependencies..."
    
    # Check Python
    if ! command -v python3 &> /dev/null; then
        error "Python 3 not found"
    fi
    
    # Check virtual environment
    if [ ! -d "$VENV_PATH" ]; then
        log "Virtual environment not found, creating..."
        python3 -m venv "$VENV_PATH" || error "Failed to create virtual environment"
    fi
    
    # Activate virtual environment
    source "$VENV_PATH/bin/activate" || error "Failed to activate virtual environment"
    
    # Check Python packages
    REQUIRED_PACKAGES=("nats-py" "pulsar-client")
    for package in "${REQUIRED_PACKAGES[@]}"; do
        if ! python3 -c "import ${package%%==*}" &> /dev/null; then
            log "Installing missing package: $package"
            pip install "$package" || error "Failed to install $package"
        fi
    done
    
    log "All dependencies satisfied"
}

# Check if bridge is already running
is_running() {
    if pgrep -f "nats_pulsar_bridge.py" > /dev/null; then
        return 0
    else
        return 1
    fi
}

# Start bridge
start_bridge() {
    if is_running; then
        log "Bridge is already running"
        return 0
    fi
    
    log "Starting NATS-Pulsar bridge..."
    
    # Activate virtual environment
    source "$VENV_PATH/bin/activate"
    
    # Start bridge in background
    nohup python3 "$PYTHON_SCRIPT" >> "$LOG_FILE" 2>&1 & 
    
    # Wait for startup
    sleep 2
    
    if is_running; then
        BRIDGE_PID=$(pgrep -f "nats_pulsar_bridge.py")
        log "${GREEN}Bridge started successfully (PID: $BRIDGE_PID)${NC}"
        echo "$BRIDGE_PID" > "$BRIDGE_DIR/bridge.pid"
        return 0
    else
        error "Failed to start bridge"
    fi
}

# Stop bridge
stop_bridge() {
    if ! is_running; then
        log "Bridge is not running"
        return 0
    fi
    
    log "Stopping NATS-Pulsar bridge..."
    
    # Get PID
    if [ -f "$BRIDGE_DIR/bridge.pid" ]; then
        BRIDGE_PID=$(cat "$BRIDGE_DIR/bridge.pid")
        kill "$BRIDGE_PID" 2>/dev/null
        
        # Wait for process to stop
        for i in {1..10}; do
            if ! kill -0 "$BRIDGE_PID" 2>/dev/null; then
                break
            fi
            sleep 1
        done
        
        # Force kill if still running
        if kill -0 "$BRIDGE_PID" 2>/dev/null; then
            kill -9 "$BRIDGE_PID" 2>/dev/null
            log "Bridge force stopped"
        else
            log "Bridge stopped gracefully"
        fi
        
        rm -f "$BRIDGE_DIR/bridge.pid"
    else
        # Fallback: kill by process name
        pkill -f "nats_pulsar_bridge.py" 2>/dev/null
        sleep 2
        pkill -9 -f "nats_pulsar_bridge.py" 2>/dev/null
        log "Bridge stopped (fallback method)"
    fi
    
    log "${GREEN}Bridge stopped successfully${NC}"
}

# Restart bridge
restart_bridge() {
    stop_bridge
    sleep 2
    start_bridge
}

# Status check
status_bridge() {
    if is_running; then
        BRIDGE_PID=$(pgrep -f "nats_pulsar_bridge.py")
        log "${GREEN}Bridge is running (PID: $BRIDGE_PID)${NC}"
        
        # Show recent logs
        log "Recent log entries:"
        tail -10 "$LOG_FILE" | while read line; do
            echo "  $line"
        done
        
        return 0
    else
        log "${YELLOW}Bridge is not running${NC}"
        return 1
    fi
}

# Monitor bridge
monitor_bridge() {
    log "Starting bridge monitor..."
    
    while true; do
        if ! is_running; then
            log "${RED}Bridge is down, attempting restart...${NC}"
            start_bridge
        fi
        
        # Check every 30 seconds
        sleep 30
    done
}

# Main script logic
case "$1" in
    start)
        check_dependencies
        start_bridge
        ;;
    stop)
        stop_bridge
        ;;
    restart)
        check_dependencies
        restart_bridge
        ;;
    status)
        status_bridge
        ;;
    monitor)
        check_dependencies
        monitor_bridge
        ;;
    *)
        echo "Usage: $0 {start|stop|restart|status|monitor}"
        echo ""
        echo "Options:"
        echo "  start    - Start the NATS-Pulsar bridge"
        echo "  stop     - Stop the bridge"
        echo "  restart  - Restart the bridge"
        echo "  status   - Check bridge status"
        echo "  monitor  - Continuous monitoring and auto-restart"
        exit 1
        ;;
esac