package sandbox

import (
	"fmt"
	"os"
	"syscall"
)

// SSHInto opens an interactive SSH session to a sandbox node.
func SSHInto(name string, nodeNum int) error {
	cfg, err := LoadConfig()
	if err != nil {
		return err
	}

	state, err := resolveSandbox(name)
	if err != nil {
		return err
	}

	if nodeNum < 1 || nodeNum > len(state.Servers) {
		return fmt.Errorf("node number must be between 1 and %d", len(state.Servers))
	}

	srv := state.Servers[nodeNum-1]
	sshKeyPath := cfg.ExpandedPrivateKeyPath()

	fmt.Printf("Connecting to %s (%s, %s)...\n", srv.Name, srv.IP, srv.Role)

	// Find ssh binary
	sshBin, err := findSSHBinary()
	if err != nil {
		return err
	}

	// Replace current process with SSH
	args := []string{
		"ssh",
		"-o", "StrictHostKeyChecking=no",
		"-o", "UserKnownHostsFile=/dev/null",
		"-i", sshKeyPath,
		fmt.Sprintf("root@%s", srv.IP),
	}

	return syscall.Exec(sshBin, args, os.Environ())
}

// findSSHBinary locates the ssh binary in PATH.
func findSSHBinary() (string, error) {
	paths := []string{"/usr/bin/ssh", "/usr/local/bin/ssh", "/opt/homebrew/bin/ssh"}
	for _, p := range paths {
		if _, err := os.Stat(p); err == nil {
			return p, nil
		}
	}
	return "", fmt.Errorf("ssh binary not found")
}