#!/bin/bash

# Discord Voice Translator v2 - Deployment Script
# Microservices Architecture with GPU-accelerated transcription

set -e  # Exit on any error

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

# Configuration
COMPOSE_FILE="docker-compose.yml"
ENV_FILE=".env"
SERVICES=("recorder" "audio-processor" "whisper-service" "translator" "transcriber" "dashboard" "postgres" "redis")
GPU_SERVICES=("whisper-service")

# Function to print colored output
print_status() {
    echo -e "${BLUE}[INFO]${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"
}

# Function to check if command exists
command_exists() {
    command -v "$1" >/dev/null 2>&1
}

# Function to check system requirements
check_requirements() {
    print_status "Checking system requirements..."
    
    # Check Docker
    if ! command_exists docker; then
        print_error "Docker is not installed. Please install Docker first."
        exit 1
    fi
    
    # Check Docker Compose
    if ! command_exists docker-compose && ! docker compose version >/dev/null 2>&1; then
        print_error "Docker Compose is not installed. Please install Docker Compose first."
        exit 1
    fi
    
    # Check NVIDIA runtime for GPU services
    if docker info | grep -q "nvidia"; then
        print_success "NVIDIA Docker runtime detected"
    else
        print_warning "NVIDIA Docker runtime not detected. GPU acceleration may not work."
    fi
    
    # Check if .env file exists
    if [[ ! -f "$ENV_FILE" ]]; then
        print_warning ".env file not found. Using .env.example as template."
        if [[ -f ".env.example" ]]; then
            cp .env.example .env
            print_status "Created .env file from .env.example. Please configure it before running."
        else
            print_error ".env.example file not found. Please create environment configuration."
            exit 1
        fi
    fi
    
    print_success "System requirements check completed"
}

# Function to create necessary directories
create_directories() {
    print_status "Creating data directories..."
    
    directories=(
        "data/audio/raw"
        "data/audio/processed"
        "data/database"
        "data/redis"
        "data/logs"
        "data/models"
    )
    
    for dir in "${directories[@]}"; do
        if [[ ! -d "$dir" ]]; then
            mkdir -p "$dir"
            print_status "Created directory: $dir"
        fi
    done
    
    # Set proper permissions
    chmod -R 755 data/
    
    print_success "Data directories created"
}

# Function to pull required Docker images
pull_images() {
    print_status "Pulling Docker images..."
    
    # Pull other base images
    docker pull postgres:15-alpine
    docker pull redis:7-alpine
    docker pull nginx:alpine
    
    # Pull optional admin images
    docker pull dpage/pgadmin4:latest
    docker pull rediscommander/redis-commander:latest
    
    print_success "Docker images pulled"
}

# Function to build services
build_services() {
    print_status "Building microservices..."
    
    # Use docker-compose or docker compose based on availability
    if command_exists docker-compose; then
        COMPOSE_CMD="docker-compose"
    else
        COMPOSE_CMD="docker compose"
    fi
    
    # Build all services
    $COMPOSE_CMD build --no-cache
    
    print_success "Services built successfully"
}

# Function to start services
start_services() {
    print_status "Starting services..."
    
    # Use docker-compose or docker compose based on availability
    if command_exists docker-compose; then
        COMPOSE_CMD="docker-compose"
    else
        COMPOSE_CMD="docker compose"
    fi
    
    # Start core services first
    print_status "Starting data services (postgres, redis)..."
    $COMPOSE_CMD up -d postgres redis
    
    # Wait for database to be ready
    print_status "Waiting for database to be ready..."
    sleep 10
    
    # Start processing services
    print_status "Starting processing services..."
    $COMPOSE_CMD up -d audio-processor whisper-service translator
    
    # Wait for processing services to be ready
    print_status "Waiting for processing services to be ready..."
    sleep 5
    
    # Start recorder and transcriber
    print_status "Starting Discord bot services..."
    $COMPOSE_CMD up -d recorder transcriber
    
    # Start dashboard
    print_status "Starting dashboard..."
    $COMPOSE_CMD up -d dashboard
    
    print_success "All services started successfully"
}

# Function to show service status
show_status() {
    print_status "Service Status:"
    echo "===================="
    
    # Use docker-compose or docker compose based on availability
    if command_exists docker-compose; then
        COMPOSE_CMD="docker-compose"
    else
        COMPOSE_CMD="docker compose"
    fi
    
    $COMPOSE_CMD ps
    
    echo ""
    print_status "Service URLs:"
    echo "===================="
    echo "Dashboard: http://localhost:3010"
    echo "Whisper Service: http://localhost:8001"
    echo "Translator Service: http://localhost:8002"
    echo "Database: localhost:5434"
    echo "Redis: localhost:6379"
    echo ""
    
    print_status "Optional Admin Interfaces (use --profile admin):"
    echo "PGAdmin: http://localhost:8085"
    echo "Redis Commander: http://localhost:8086"
}

# Function to display help
show_help() {
    echo "Discord Voice Translator v2 - Deployment Script"
    echo "Usage: $0 [OPTION]"
    echo ""
    echo "Options:"
    echo "  start         Start all services (default)"
    echo "  stop          Stop all services"
    echo "  restart       Restart all services"
    echo "  build         Build all services"
    echo "  pull          Pull Docker images"
    echo "  status        Show service status"
    echo "  logs          Show logs for all services"
    echo "  logs [service] Show logs for specific service"
    echo "  clean         Stop and remove all containers and volumes"
    echo "  admin         Start with admin interfaces (PGAdmin, Redis Commander)"
    echo "  proxy         Start with nginx proxy"
    echo "  help          Show this help message"
    echo ""
    echo "Examples:"
    echo "  $0                    # Start all services"
    echo "  $0 start              # Start all services"
    echo "  $0 admin              # Start with admin interfaces"
    echo "  $0 logs whisper-service # Show logs for whisper service"
    echo "  $0 clean              # Clean up everything"
}

# Function to show logs
show_logs() {
    # Use docker-compose or docker compose based on availability
    if command_exists docker-compose; then
        COMPOSE_CMD="docker-compose"
    else
        COMPOSE_CMD="docker compose"
    fi
    
    if [[ -n "$1" ]]; then
        print_status "Showing logs for service: $1"
        $COMPOSE_CMD logs -f "$1"
    else
        print_status "Showing logs for all services"
        $COMPOSE_CMD logs -f
    fi
}

# Function to stop services
stop_services() {
    print_status "Stopping all services..."
    
    # Use docker-compose or docker compose based on availability
    if command_exists docker-compose; then
        COMPOSE_CMD="docker-compose"
    else
        COMPOSE_CMD="docker compose"
    fi
    
    $COMPOSE_CMD down
    
    print_success "All services stopped"
}

# Function to clean up
clean_up() {
    print_warning "This will remove all containers, networks, and volumes. Are you sure? (y/N)"
    read -r response
    
    if [[ "$response" =~ ^[Yy]$ ]]; then
        print_status "Cleaning up containers, networks, and volumes..."
        
        # Use docker-compose or docker compose based on availability
        if command_exists docker-compose; then
            COMPOSE_CMD="docker-compose"
        else
            COMPOSE_CMD="docker compose"
        fi
        
        $COMPOSE_CMD down -v --remove-orphans
        
        # Remove all related images
        docker image prune -f
        
        print_success "Cleanup completed"
    else
        print_status "Cleanup cancelled"
    fi
}

# Function to restart services
restart_services() {
    print_status "Restarting all services..."
    stop_services
    sleep 2
    start_services
}

# Main script logic
main() {
    # Parse command line arguments
    case "${1:-start}" in
        "start")
            check_requirements
            create_directories
            pull_images
            build_services
            start_services
            show_status
            ;;
        "stop")
            stop_services
            ;;
        "restart")
            restart_services
            show_status
            ;;
        "build")
            check_requirements
            build_services
            ;;
        "pull")
            pull_images
            ;;
        "status")
            show_status
            ;;
        "logs")
            show_logs "$2"
            ;;
        "clean")
            clean_up
            ;;
        "admin")
            check_requirements
            create_directories
            pull_images
            build_services
            print_status "Starting with admin interfaces..."
            
            # Use docker-compose or docker compose based on availability
            if command_exists docker-compose; then
                COMPOSE_CMD="docker-compose"
            else
                COMPOSE_CMD="docker compose"
            fi
            
            $COMPOSE_CMD --profile admin up -d
            show_status
            ;;
        "proxy")
            check_requirements
            create_directories
            pull_images
            build_services
            print_status "Starting with nginx proxy..."
            
            # Use docker-compose or docker compose based on availability
            if command_exists docker-compose; then
                COMPOSE_CMD="docker-compose"
            else
                COMPOSE_CMD="docker compose"
            fi
            
            $COMPOSE_CMD --profile proxy up -d
            show_status
            ;;
        "help"|"-h"|"--help")
            show_help
            ;;
        *)
            print_error "Unknown command: $1"
            show_help
            exit 1
            ;;
    esac
}

# Run main function
main "$@"