package main

import (
	"bufio"
	"context"
	"fmt"
	"os"
	"strings"
	"time"

	"github.com/google/uuid"
	"github.com/spf13/cobra"

	"git.tukangketik.id/swanadiva/hostkeeper/internal/models"
	"git.tukangketik.id/swanadiva/hostkeeper/pkg/config"
	"git.tukangketik.id/swanadiva/hostkeeper/pkg/storage"
)

var (
	addHostname string
	addPort     int
	addUser     string
	addPassword string
	addKeyPath  string
	addAuthType string
	addGroup    string
	addTags     []string
	addNotes    string
)

// addCmd represents the add command
var addCmd = &cobra.Command{
	Use:   "add [name]",
	Short: "Add a new SSH host",
	Long: `Add a new SSH host connection to HostKeeper.

You can add hosts using flags for quick addition or interactively.

Examples:
  # Add host with password authentication
  hostkeeper add myserver --host 192.168.1.10 --user admin --password mypass

  # Add host with key authentication
  hostkeeper add myserver --host 192.168.1.10 --user admin --key ~/.ssh/id_rsa

  # Add host with custom port and group
  hostkeeper add myserver --host 192.168.1.10 --port 2222 --user admin --password mypass --group production

  # Add host interactively
  hostkeeper add`,
	Args: cobra.MaximumNArgs(1),
	RunE: runAddHost,
}

func init() {
	// Flags for add command
	addCmd.Flags().StringVar(&addHostname, "host", "", "hostname or IP address")
	addCmd.Flags().IntVar(&addPort, "port", 0, "SSH port (default: 22)")
	addCmd.Flags().StringVar(&addUser, "user", "", "SSH username")
	addCmd.Flags().StringVar(&addPassword, "password", "", "SSH password")
	addCmd.Flags().StringVar(&addKeyPath, "key", "", "path to SSH private key")
	addCmd.Flags().StringVar(&addAuthType, "auth-type", "", "authentication type: password, key, or both")
	addCmd.Flags().StringVar(&addGroup, "group", "", "host group for categorization")
	addCmd.Flags().StringSliceVar(&addTags, "tags", nil, "tags for the host (comma-separated)")
	addCmd.Flags().StringVar(&addNotes, "notes", "", "notes about this host")

	rootCmd.AddCommand(addCmd)
}

func runAddHost(cmd *cobra.Command, args []string) error {
	cfg := appCfg
	if cfg == nil {
		var err error
		cfg, err = config.New()
		if err != nil {
			return fmt.Errorf("failed to initialize config: %w", err)
		}
	}

	// Determine host name
	var name string
	if len(args) > 0 {
		name = args[0]
	}

	// Check if we should use interactive mode
	interactive := name == "" && addHostname == ""
	if interactive {
		return addHostInteractive(cfg)
	}

	// Validate required fields
	if name == "" {
		return fmt.Errorf("host name is required (provide as argument or use interactive mode)")
	}
	if addHostname == "" {
		return fmt.Errorf("hostname is required (--host flag)")
	}
	if addUser == "" {
		return fmt.Errorf("username is required (--user flag)")
	}

	// Set default port from config
	port := addPort
	if port == 0 {
		port = cfg.GetAppConfig().DefaultPort
	}

	// Determine auth type
	authType := addAuthType
	if authType == "" {
		if addKeyPath != "" && addPassword != "" {
			authType = "both"
		} else if addKeyPath != "" {
			authType = "key"
		} else if addPassword != "" {
			authType = "password"
		} else {
			return fmt.Errorf("authentication is required: provide --password, --key, or both")
		}
	}

	// Read key if provided
	keyContent := ""
	if addKeyPath != "" {
		data, err := os.ReadFile(addKeyPath)
		if err != nil {
			return fmt.Errorf("failed to read key file: %w", err)
		}
		keyContent = string(data)
	}

	// Create host
	host := &models.Host{
		ID:        uuid.New().String(),
		Name:      name,
		Hostname:  addHostname,
		Port:      port,
		Username:  addUser,
		Auth: models.AuthConfig{
			Type:     authType,
			Password: addPassword,
		},
		Group:     addGroup,
		Tags:      addTags,
		Notes:     addNotes,
		CreatedAt: time.Now(),
		UpdatedAt: time.Now(),
	}

	// Store key content in password field if key-only auth (as reference)
	// In a full implementation, this would store the key securely
	if keyContent != "" {
		host.Auth.Password = keyContent // Will be moved to secure storage
	}

	// Initialize storage
	store, err := storage.NewJSONStorage(cfg.GetDataDir())
	if err != nil {
		return fmt.Errorf("failed to initialize storage: %w", err)
	}

	// Save host
	ctx := context.Background()
	if err := store.SaveHost(ctx, host); err != nil {
		return fmt.Errorf("failed to save host: %w", err)
	}

	fmt.Printf("✓ Host '%s' added successfully\n", name)
	fmt.Printf("  Hostname: %s:%d\n", addHostname, port)
	fmt.Printf("  User: %s\n", addUser)
	fmt.Printf("  Auth: %s\n", authType)

	return nil
}

func addHostInteractive(cfg *config.Config) error {
	input := bufio.NewReader(os.Stdin)

	fmt.Println("╔══════════════════════════════════════╗")
	fmt.Println("║     Add New SSH Host                 ║")
	fmt.Println("╚══════════════════════════════════════╝")
	fmt.Println()

	readLine := func(prompt string) string {
		fmt.Print(prompt)
		line, _ := input.ReadString('\n')
		return strings.TrimRight(line, "\n\r")
	}

	// Get host name
	name := readLine("Host Name (e.g., myserver): ")
	if name == "" {
		return fmt.Errorf("host name is required")
	}

	// Get hostname
	hostname := readLine("Hostname or IP (e.g., 192.168.1.10): ")
	if hostname == "" {
		return fmt.Errorf("hostname is required")
	}

	// Get port
	defaultPort := cfg.GetAppConfig().DefaultPort
	portInput := readLine(fmt.Sprintf("Port [%d]: ", defaultPort))
	port := defaultPort
	if portInput != "" {
		fmt.Sscanf(portInput, "%d", &port)
	}

	// Get username
	username := readLine("Username: ")
	if username == "" {
		return fmt.Errorf("username is required")
	}

	// Get auth type
	authType := readLine("Auth Type (password/key/both) [password]: ")
	if authType == "" {
		authType = "password"
	}

	// Get password
	var password string
	if authType == "password" || authType == "both" {
		password = readLine("Password: ")
	}

	// Get key path
	var keyContent string
	if authType == "key" || authType == "both" {
		keyPath := readLine("Path to private key (~/.ssh/id_rsa): ")
		if keyPath != "" {
			data, err := os.ReadFile(keyPath)
			if err != nil {
				return fmt.Errorf("failed to read key file: %w", err)
			}
			keyContent = string(data)
		}
	}

	// Get group
	group := readLine("Group (optional): ")

	// Get tags
	tagsInput := readLine("Tags (comma-separated, optional): ")
	var tags []string
	if tagsInput != "" {
		tags = strings.Split(tagsInput, ",")
		for i, t := range tags {
			tags[i] = strings.TrimSpace(t)
		}
	}

	// Get notes
	notes := readLine("Notes (optional): ")

	// Create host
	host := &models.Host{
		ID:        uuid.New().String(),
		Name:      name,
		Hostname:  hostname,
		Port:      port,
		Username:  username,
		Auth: models.AuthConfig{
			Type:     authType,
			Password: password,
		},
		Group:     group,
		Tags:      tags,
		Notes:     notes,
		CreatedAt: time.Now(),
		UpdatedAt: time.Now(),
	}

	if keyContent != "" {
		host.Auth.Password = keyContent
	}

	// Initialize storage
	store, err := storage.NewJSONStorage(cfg.GetDataDir())
	if err != nil {
		return fmt.Errorf("failed to initialize storage: %w", err)
	}

	// Save host
	ctx := context.Background()
	if err := store.SaveHost(ctx, host); err != nil {
		return fmt.Errorf("failed to save host: %w", err)
	}

	fmt.Println()
	fmt.Printf("✓ Host '%s' added successfully!\n", name)

	return nil
}