#!/bin/bash

# ROA2WEB Ultrathin Monolith - Unified Starter Script
# Starts all services for the unified application:
# - SSH Tunnel (if needed for environment)
# - Unified Backend (8000) - includes Reports, Data Entry, and Telegram
# - Unified Frontend (3000)
#
# Usage:
#   ./start.sh prod        Start production environment
#   ./start.sh test        Start test environment
#   ./start.sh prod stop   Stop production services
#   ./start.sh test stop   Stop test services

set -e  # Exit on any error

# Get the directory where this script is located
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

# Load NVM if available (required for npm)
export NVM_DIR="$HOME/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"

# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
CYAN='\033[0;36m'
NC='\033[0m' # No Color

# ============================================================================
# Configuration based on environment
# ============================================================================
ENV_NAME=""
ENV_FILE=""
LOG_DIR=""
BACKEND_LOG=""
FRONTEND_LOG=""
NEEDS_SSH_TUNNEL=false
BACKEND_RESTART_PID=""

configure_environment() {
    case "$1" in
        prod|production)
            ENV_NAME="PROD"
            ENV_FILE=".env.prod"
            LOG_DIR="$SCRIPT_DIR/logs"
            BACKEND_LOG="$LOG_DIR/backend-stderr.log"
            FRONTEND_LOG="$LOG_DIR/frontend.log"
            NEEDS_SSH_TUNNEL=true
            ;;
        test)
            ENV_NAME="TEST"
            ENV_FILE=".env.test"
            LOG_DIR="/tmp"
            BACKEND_LOG="/tmp/unified_backend_test.log"
            FRONTEND_LOG="/tmp/unified_frontend_test.log"
            NEEDS_SSH_TUNNEL=false  # Direct connection to 10.0.20.121
            ;;
        *)
            echo -e "${RED}Error: Unknown environment '$1'${NC}"
            echo ""
            show_usage
            exit 1
            ;;
    esac
}

show_usage() {
    echo -e "${BLUE}ROA2WEB Unified Starter${NC}"
    echo ""
    echo "Usage: $0 <environment> [action]"
    echo ""
    echo "Environments:"
    echo "  prod, production    Production environment (SSH tunnel to Oracle)"
    echo "  test                Test environment (direct connection to 10.0.20.121)"
    echo ""
    echo "Actions:"
    echo "  start               Start all services (default)"
    echo "  stop                Stop all services"
    echo ""
    echo "Examples:"
    echo "  $0 prod             Start production"
    echo "  $0 test             Start test"
    echo "  $0 prod stop        Stop production"
    echo "  $0 test stop        Stop test"
    echo ""
}

# ============================================================================
# Helper functions
# ============================================================================
print_message() {
    echo -e "${CYAN}[UNIFIED-${ENV_NAME}]${NC} $1"
}

print_success() {
    echo -e "${GREEN}[SUCCESS]${NC} $1"
}

print_warning() {
    echo -e "${YELLOW}[WARNING]${NC} $1"
}

print_error() {
    echo -e "${RED}[ERROR]${NC} $1"
}

check_port() {
    local port=$1
    if lsof -Pi :$port -sTCP:LISTEN -t >/dev/null 2>&1; then
        return 0
    else
        return 1
    fi
}

# ============================================================================
# Stop all services
# ============================================================================
cleanup() {
    print_message "Stopping all services..."

    # Stop run-with-restart.sh wrapper FIRST by saved PID (prevents auto-restart race)
    if [ -n "$BACKEND_RESTART_PID" ] && kill -0 "$BACKEND_RESTART_PID" 2>/dev/null; then
        print_message "Stopping backend restart wrapper (PID $BACKEND_RESTART_PID)..."
        kill "$BACKEND_RESTART_PID" 2>/dev/null || true
        sleep 2
    fi

    # Kill ALL uvicorn instances unconditionally (regardless of port status)
    # This handles cases where uvicorn is still starting up or has crashed
    print_message "Stopping Unified Backend..."
    pkill -f "uvicorn main:app" 2>/dev/null || true
    pkill -f "run-with-restart.sh" 2>/dev/null || true
    sleep 2
    pkill -9 -f "uvicorn main:app" 2>/dev/null || true
    pkill -9 -f "run-with-restart.sh" 2>/dev/null || true
    lsof -ti:8000 | xargs kill -KILL 2>/dev/null || true

    # Stop Unified Frontend (3000)
    if check_port 3000; then
        print_message "Stopping Unified Frontend..."
        lsof -ti:3000 | xargs kill -TERM 2>/dev/null || true
        sleep 1
        lsof -ti:3000 | xargs kill -KILL 2>/dev/null || true
    fi

    # Stop SSH tunnel (if script exists)
    if [ -f "$SCRIPT_DIR/ssh-tunnel.sh" ]; then
        print_message "Stopping SSH Tunnel..."
        "$SCRIPT_DIR/ssh-tunnel.sh" stop 2>/dev/null || true
    fi

    print_success "All services stopped."
    exit 0
}

# ============================================================================
# Start all services
# ============================================================================
start_services() {
    print_message "Starting ROA2WEB Ultrathin Monolith (${ENV_NAME} Environment)..."
    echo

    # Step 1: SSH Tunnel
    print_message "1. Checking SSH Tunnel..."
    if [ -f "$SCRIPT_DIR/ssh-tunnel.sh" ]; then
        if [ "$NEEDS_SSH_TUNNEL" = true ]; then
            if "$SCRIPT_DIR/ssh-tunnel.sh" start; then
                print_success "SSH Tunnel started"
            else
                print_warning "SSH tunnel may already be running or failed to start"
            fi
            sleep 2
        else
            # For test - run anyway (will skip servers without ssh_host)
            "$SCRIPT_DIR/ssh-tunnel.sh" start 2>/dev/null || true
            print_success "${ENV_NAME} uses direct connection - no tunnel needed"
            sleep 1
        fi
    else
        print_warning "SSH tunnel script not found - skipping"
    fi

    # Step 1.5: Check poppler-utils (required for PDF OCR)
    if ! command -v pdftoppm &> /dev/null; then
        print_warning "poppler-utils not found - required for PDF OCR processing"
        print_message "Installing poppler-utils..."
        if sudo apt-get update -qq && sudo apt-get install -y -qq poppler-utils; then
            print_success "poppler-utils installed"
        else
            print_warning "Could not install poppler-utils - PDF OCR may not work"
        fi
    else
        print_success "poppler-utils found ($(pdftoppm -v 2>&1 | head -1))"
    fi

    # Step 2: Start Unified Backend (8000)
    print_message "2. Starting Unified Backend on port 8000..."

    # Create and clear log files
    mkdir -p "$LOG_DIR"
    > "$BACKEND_LOG"
    > "$FRONTEND_LOG"

    if check_port 8000; then
        print_warning "Port 8000 already in use - Unified Backend may be running"
    else
        cd "$SCRIPT_DIR/backend/"

        # Create venv if doesn't exist
        if [ ! -d "venv" ]; then
            print_message "Creating Python virtual environment..."
            python3 -m venv venv
        fi

        # Activate venv
        source venv/bin/activate

        # Install dependencies if needed
        if ! python -c "import fastapi, uvicorn" 2>/dev/null; then
            print_message "Installing dependencies (this may take 3-5 minutes for ML packages)..."
            pip install -r requirements.txt
        fi

        # Check for environment configuration
        if [ ! -f "$ENV_FILE" ]; then
            print_error "$ENV_FILE not found!"
            print_warning "Please create $ENV_FILE from .env.example"
            exit 1
        fi

        # Copy environment to active .env
        print_message "Using ${ENV_NAME} environment ($ENV_FILE)..."
        cp "$ENV_FILE" .env

        # Load environment
        set -a
        source .env
        set +a

        # Start backend with auto-restart on crash (OOM protection)
        print_message "Starting unified backend with auto-restart..."
        nohup ./run-with-restart.sh 8000 "$BACKEND_LOG" > /dev/null 2>&1 &
        BACKEND_RESTART_PID=$!

        cd "$SCRIPT_DIR"

        # Wait for backend to start
        print_message "Waiting for Unified Backend to initialize (Oracle + Cache + DBs + Telegram)..."
        MAX_WAIT=45
        ELAPSED=0
        while [ $ELAPSED -lt $MAX_WAIT ]; do
            if check_port 8000; then
                print_success "Unified Backend started on http://localhost:8000"
                break
            fi
            sleep 1
            ELAPSED=$((ELAPSED + 1))
            if [ $((ELAPSED % 5)) -eq 0 ]; then
                print_message "Still initializing... ($ELAPSED/${MAX_WAIT}s)"
            fi
        done

        if ! check_port 8000; then
            print_error "Unified Backend failed to start - check $BACKEND_LOG"
            tail -n 30 "$BACKEND_LOG"
            cleanup
        fi
    fi

    # Step 3: Start Unified Frontend (port 3000)
    print_message "3. Starting Unified Frontend (port 3000)..."

    if check_port 3000; then
        print_warning "Port 3000 already in use - Unified Frontend may be running"
    else
        cd "$SCRIPT_DIR"

        # Check if node_modules exists
        if [ ! -d "node_modules" ] || [ ! -f "node_modules/.bin/vite" ]; then
            print_message "Installing Unified Frontend dependencies..."
            npm install
        fi

        # Start frontend with NVM environment
        print_message "Starting Vite development server..."
        nohup bash -c 'export NVM_DIR="$HOME/.nvm"; [ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"; npm run dev' > "$FRONTEND_LOG" 2>&1 &
        FRONTEND_PID=$!

        # Wait for frontend to start
        print_message "Waiting for Vite to initialize..."
        MAX_WAIT=15
        ELAPSED=0
        while [ $ELAPSED -lt $MAX_WAIT ]; do
            if check_port 3000; then
                print_success "Unified Frontend started on http://localhost:3000"
                break
            fi
            sleep 2
            ELAPSED=$((ELAPSED + 2))
        done

        if ! check_port 3000; then
            print_error "Unified Frontend failed to start - check $FRONTEND_LOG"
            cat "$FRONTEND_LOG"
            cleanup
        fi
    fi

    # Summary
    echo
    print_success "🚀 ROA2WEB Ultrathin Monolith (${ENV_NAME}) is now running!"
    echo
    echo -e "${BLUE}Services:${NC}"
    if [ "$NEEDS_SSH_TUNNEL" = true ]; then
        echo "  • SSH Tunnel:          Active (Oracle DB connection)"
    else
        echo "  • Oracle Connection:   Direct (no SSH tunnel needed)"
    fi
    echo "  • Unified Backend:     http://localhost:8000"
    echo "  •   ├── Reports API:   http://localhost:8000/api/reports/*"
    echo "  •   ├── Data Entry:    http://localhost:8000/api/data-entry/*"
    echo "  •   ├── Telegram:      http://localhost:8000/api/telegram/*"
    echo "  •   └── Bot:           Running as background task"
    echo "  • Unified Frontend:    http://localhost:3000"
    echo
    echo -e "${BLUE}API Documentation:${NC}"
    echo "  • Unified API Docs:    http://localhost:8000/docs"
    echo "  • Health Check:        http://localhost:8000/health"
    echo
    echo -e "${BLUE}Log Files:${NC}"
    echo "  • Unified Backend:     $BACKEND_LOG"
    echo "  • Unified Frontend:    $FRONTEND_LOG"
    echo
    echo -e "${YELLOW}Press Ctrl+C to stop all services${NC}"
    echo

    # Keep script running
    wait
}

# ============================================================================
# Main
# ============================================================================

# Check arguments
if [ $# -lt 1 ]; then
    show_usage
    exit 1
fi

# Configure environment
configure_environment "$1"

# Set up signal handlers
trap cleanup SIGINT SIGTERM

# Execute action
ACTION="${2:-start}"
case "$ACTION" in
    start)
        start_services
        ;;
    stop)
        cleanup
        ;;
    *)
        print_error "Unknown action: $ACTION"
        show_usage
        exit 1
        ;;
esac