#!/bin/bash

# Production Startup Script for Trasabilitate Application
# This script starts the application using Gunicorn WSGI server

set -e  # Exit on any error

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

print_step() {
    echo -e "\n${BLUE}📋 $1${NC}"
    echo "----------------------------------------"
}

print_success() {
    echo -e "${GREEN}✅ $1${NC}"
}

print_warning() {
    echo -e "${YELLOW}⚠️  $1${NC}"
}

print_error() {
    echo -e "${RED}❌ $1${NC}"
}

echo -e "${BLUE}🚀 Trasabilitate Application - Production Startup${NC}"
echo "=============================================="

# Check if we're in the right directory
if [[ ! -f "wsgi.py" ]]; then
    print_error "Please run this script from the py_app directory"
    print_error "Expected location: /srv/quality_recticel/py_app"
    exit 1
fi

print_step "Checking Prerequisites"

# Check if virtual environment exists
if [[ ! -d "../recticel" ]]; then
    print_error "Virtual environment 'recticel' not found"
    print_error "Please create it first or run './quick_deploy.sh'"
    exit 1
fi

print_success "Virtual environment found"

# Activate virtual environment
print_step "Activating Virtual Environment"
source ../recticel/bin/activate
print_success "Virtual environment activated"

# Check if Gunicorn is installed
if ! command -v gunicorn &> /dev/null; then
    print_error "Gunicorn not found. Installing..."
    pip install gunicorn
fi

print_success "Gunicorn is available"

# Check database connection
print_step "Testing Database Connection"
if python3 -c "
import mariadb
try:
    conn = mariadb.connect(user='trasabilitate', password='Initial01!', host='localhost', database='trasabilitate')
    conn.close()
    print('Database connection successful')
except Exception as e:
    print(f'Database connection failed: {e}')
    exit(1)
" > /dev/null 2>&1; then
    print_success "Database connection verified"
else
    print_error "Database connection failed. Please run database setup first:"
    print_error "python3 app/db_create_scripts/setup_complete_database.py"
    exit 1
fi

# Create PID file directory
print_step "Setting up Runtime Environment"
mkdir -p ../run
print_success "Runtime directory created"

# Check if already running
PID_FILE="../run/trasabilitate.pid"
if [[ -f "$PID_FILE" ]]; then
    PID=$(cat "$PID_FILE")
    if ps -p "$PID" > /dev/null 2>&1; then
        print_warning "Application is already running (PID: $PID)"
        echo "To stop the application, run:"
        echo "kill $PID"
        echo "rm $PID_FILE"
        exit 1
    else
        print_warning "Stale PID file found, removing..."
        rm -f "$PID_FILE"
    fi
fi

# Start Gunicorn
print_step "Starting Production Server"

echo "Starting Gunicorn WSGI server..."
echo "Configuration: gunicorn.conf.py"
echo "Workers: $(python3 -c 'import multiprocessing; print(multiprocessing.cpu_count() * 2 + 1)')"
echo "Binding to: 0.0.0.0:8781"
echo ""

# Start Gunicorn with configuration file
gunicorn --config gunicorn.conf.py \
         --pid "$PID_FILE" \
         --daemon \
         wsgi:application

# Wait a moment for startup
sleep 2

# Check if the process started successfully
if [[ -f "$PID_FILE" ]]; then
    PID=$(cat "$PID_FILE")
    if ps -p "$PID" > /dev/null 2>&1; then
        print_success "Application started successfully!"
        echo ""
        echo "=============================================="
        echo -e "${GREEN}🎉 PRODUCTION SERVER RUNNING${NC}"
        echo "=============================================="
        echo ""
        echo "📋 Server Information:"
        echo "   • Process ID: $PID"
        echo "   • Configuration: gunicorn.conf.py"
        echo "   • Access Log: /srv/quality_recticel/logs/access.log"
        echo "   • Error Log: /srv/quality_recticel/logs/error.log"
        echo ""
        echo "🌐 Application URLs:"
        echo "   • Local:   http://127.0.0.1:8781"
        echo "   • Network: http://$(hostname -I | awk '{print $1}'):8781"
        echo ""
        echo "👤 Default Login:"
        echo "   • Username: superadmin"
        echo "   • Password: superadmin123"
        echo ""
        echo "🔧 Management Commands:"
        echo "   • Stop server:    kill $PID && rm $PID_FILE"
        echo "   • View logs:      tail -f /srv/quality_recticel/logs/error.log"
        echo "   • Monitor access: tail -f /srv/quality_recticel/logs/access.log"
        echo "   • Server status:  ps -p $PID"
        echo ""
        print_warning "Server is running in daemon mode (background)"
    else
        print_error "Failed to start application. Check logs:"
        print_error "tail /srv/quality_recticel/logs/error.log"
        exit 1
    fi
else
    print_error "Failed to create PID file. Check permissions and logs."
    exit 1
fi