package ssh

import (
	"fmt"
	"log/slog"
	"os"
	"path/filepath"
	"time"

	"golang.org/x/crypto/ssh"
	"golang.org/x/crypto/ssh/knownhosts"
)

type Connection struct {
	Client *ssh.Client
}

func NewConnection(user, host string, port int, auth ssh.AuthMethod) (*Connection, error) {
	home, err := os.UserHomeDir()
	if err != nil {
		return nil, fmt.Errorf("failed to get home dir: %w", err)
	}
	knownHostsPath := filepath.Join(home, ".ssh", "known_hosts")

	hkCallback, err := knownhosts.New(knownHostsPath)
	if err != nil {
		slog.Warn("Could not load known_hosts, ensure you connected manually once.", "path", knownHostsPath)
		return nil, fmt.Errorf("known_hosts error: %w", err)
	}

	cfg := &ssh.ClientConfig{
		User:            user,
		Auth:            []ssh.AuthMethod{auth},
		HostKeyCallback: hkCallback,
		Timeout:         10 * time.Second,
	}

	addr := fmt.Sprintf("%s:%d", host, port)
	slog.Debug("Dialing SSH", "target", addr)

	client, err := ssh.Dial("tcp", addr, cfg)
	if err != nil {
		return nil, fmt.Errorf("ssh dial failed: %w", err)
	}
	slog.Debug("SSH connection established", "target", addr)

	return &Connection{Client: client}, nil
}

func (c *Connection) Close() error {
	if c.Client != nil {
		return c.Client.Close()
	}
	return nil
}