package proxy

import (
	"context"
	"fmt"
	"os"
	"path/filepath"

	"github.com/yourusername/buque/internal/docker"
	"github.com/yourusername/buque/internal/models"
)

const (
	nginxProxyImage          = "nginxproxy/nginx-proxy:latest"
	nginxProxyCompanionImage = "nginxproxy/acme-companion:latest"
)

// NginxManager manages nginx-proxy deployment and configuration
type NginxManager struct {
	config         models.NginxProxyConfig
	dockerClient   *docker.Client
	composeManager *docker.ComposeManager
}

// NewNginxManager creates a new nginx-proxy manager
func NewNginxManager(config models.NginxProxyConfig) (*NginxManager, error) {
	dockerClient, err := docker.NewClient()
	if err != nil {
		return nil, err
	}

	composeManager, err := docker.NewComposeManager()
	if err != nil {
		return nil, err
	}

	return &NginxManager{
		config:         config,
		dockerClient:   dockerClient,
		composeManager: composeManager,
	}, nil
}

// Close closes the nginx manager
func (nm *NginxManager) Close() error {
	return nm.dockerClient.Close()
}

// Deploy deploys the nginx-proxy environment
func (nm *NginxManager) Deploy(ctx context.Context) error {
	// Create nginx-proxy directory if it doesn't exist
	if err := os.MkdirAll(nm.config.Path, 0755); err != nil {
		return fmt.Errorf("failed to create nginx-proxy directory: %w", err)
	}

	// Create docker-compose.yml
	composeContent := nm.generateComposeFile()
	composePath := filepath.Join(nm.config.Path, "docker-compose.yml")
	if err := os.WriteFile(composePath, []byte(composeContent), 0644); err != nil {
		return fmt.Errorf("failed to write compose file: %w", err)
	}

	// Create network if it doesn't exist
	exists, err := nm.dockerClient.NetworkExists(ctx, nm.config.NetworkName)
	if err != nil {
		return fmt.Errorf("failed to check network: %w", err)
	}

	if !exists {
		if err := nm.dockerClient.CreateNetwork(ctx, nm.config.NetworkName); err != nil {
			return fmt.Errorf("failed to create network: %w", err)
		}
		fmt.Printf("Created network: %s\n", nm.config.NetworkName)
	}

	// Deploy using docker-compose
	env := models.Environment{
		Name:        "nginx-proxy",
		Path:        nm.config.Path,
		ComposeFile: "docker-compose.yml",
		Enabled:     true,
	}

	fmt.Println("Deploying nginx-proxy...")
	if err := nm.composeManager.Up(ctx, env, true); err != nil {
		return fmt.Errorf("failed to deploy nginx-proxy: %w", err)
	}

	fmt.Println("Nginx-proxy deployed successfully!")
	return nil
}

// Remove removes the nginx-proxy environment
func (nm *NginxManager) Remove(ctx context.Context) error {
	env := models.Environment{
		Name:        "nginx-proxy",
		Path:        nm.config.Path,
		ComposeFile: "docker-compose.yml",
		Enabled:     true,
	}

	fmt.Println("Removing nginx-proxy...")
	if err := nm.composeManager.Down(ctx, env, true); err != nil {
		return fmt.Errorf("failed to remove nginx-proxy: %w", err)
	}

	fmt.Println("Nginx-proxy removed successfully!")
	return nil
}

// Status returns the status of nginx-proxy
func (nm *NginxManager) Status(ctx context.Context) (string, error) {
	env := models.Environment{
		Name:        "nginx-proxy",
		Path:        nm.config.Path,
		ComposeFile: "docker-compose.yml",
		Enabled:     true,
	}

	return nm.composeManager.PS(ctx, env)
}

// generateComposeFile generates the docker-compose.yml content for nginx-proxy
func (nm *NginxManager) generateComposeFile() string {
	content := fmt.Sprintf(`version: '3.8'

services:
  nginx-proxy:
    image: %s
    container_name: %s
    restart: unless-stopped
    ports:
      - "%d:80"`, nginxProxyImage, nm.config.ContainerName, nm.config.HTTPPort)

	if nm.config.SSLEnabled {
		content += fmt.Sprintf(`
      - "%d:443"`, nm.config.HTTPSPort)
	}

	content += `
    volumes:
      - /var/run/docker.sock:/tmp/docker.sock:ro`

	if nm.config.SSLEnabled {
		content += `
      - certs:/etc/nginx/certs:ro
      - vhost:/etc/nginx/vhost.d
      - html:/usr/share/nginx/html`
	}

	content += `
    environment:
      - DEFAULT_HOST=localhost
    networks:
      - ` + nm.config.NetworkName

	content += `
    labels:
      - "buque.managed=true"
      - "buque.service=nginx-proxy"`

	if nm.config.SSLEnabled {
		content += fmt.Sprintf(`

  acme-companion:
    image: %s
    container_name: nginx-proxy-acme
    restart: unless-stopped
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
      - certs:/etc/nginx/certs
      - vhost:/etc/nginx/vhost.d
      - html:/usr/share/nginx/html
      - acme:/etc/acme.sh
    environment:
      - DEFAULT_EMAIL=admin@localhost
      - NGINX_PROXY_CONTAINER=%s
    networks:
      - %s
    depends_on:
      - nginx-proxy
    labels:
      - "buque.managed=true"
      - "buque.service=nginx-proxy-acme"`, nginxProxyCompanionImage, nm.config.ContainerName, nm.config.NetworkName)
	}

	content += `

networks:
  ` + nm.config.NetworkName + `:
    external: true`

	if nm.config.SSLEnabled {
		content += `

volumes:
  certs:
  vhost:
  html:
  acme:`
	}

	return content
}

// GenerateServiceLabels generates labels for a service to work with nginx-proxy
func (nm *NginxManager) GenerateServiceLabels(virtualHost string, virtualPort int, letsencryptHost string, letsencryptEmail string) map[string]string {
	labels := map[string]string{
		"VIRTUAL_HOST": virtualHost,
	}

	if virtualPort > 0 {
		labels["VIRTUAL_PORT"] = fmt.Sprintf("%d", virtualPort)
	}

	if nm.config.SSLEnabled && letsencryptHost != "" {
		labels["LETSENCRYPT_HOST"] = letsencryptHost
		if letsencryptEmail != "" {
			labels["LETSENCRYPT_EMAIL"] = letsencryptEmail
		}
	}

	return labels
}

// GetExampleServiceCompose returns an example docker-compose.yml for a service behind nginx-proxy
func (nm *NginxManager) GetExampleServiceCompose(serviceName, virtualHost string) string {
	return fmt.Sprintf(`version: '3.8'

services:
  %s:
    image: your-image:latest
    container_name: %s
    restart: unless-stopped
    expose:
      - "80"
    environment:
      - VIRTUAL_HOST=%s
      - VIRTUAL_PORT=80
      - LETSENCRYPT_HOST=%s
      - LETSENCRYPT_EMAIL=admin@%s
    networks:
      - %s
    labels:
      - "buque.environment=%s"
      - "buque.managed=true"

networks:
  %s:
    external: true
`, serviceName, serviceName, virtualHost, virtualHost, virtualHost, nm.config.NetworkName, serviceName, nm.config.NetworkName)
}