package xenserver

import (
	"fmt"
	gossh "code.google.com/p/go.crypto/ssh"
	"github.com/mitchellh/multistep"
	commonssh "github.com/mitchellh/packer/common/ssh"
	"github.com/mitchellh/packer/communicator/ssh"
    "strings"
    "log"
    "bytes"
    "net"
    "io"
)

func sshAddress(state multistep.StateBag) (string, error) {
    sshIP := state.Get("ssh_address").(string)
	sshHostPort := 22
	return fmt.Sprintf("%s:%d", sshIP, sshHostPort), nil
}

func sshLocalAddress(state multistep.StateBag) (string, error) {
    sshLocalPort := state.Get("local_ssh_port").(uint)
    conn_str := fmt.Sprintf("%s:%d", "127.0.0.1", sshLocalPort)
    log.Printf("sshLocalAddress: %s", conn_str)
    return conn_str, nil
}

func sshConfig(state multistep.StateBag) (*gossh.ClientConfig, error) {
	config := state.Get("config").(config)

	auth := []gossh.AuthMethod{
		gossh.Password(config.SSHPassword),
		gossh.KeyboardInteractive(
			ssh.PasswordKeyboardInteractive(config.SSHPassword)),
	}

	if config.SSHKeyPath != "" {
		signer, err := commonssh.FileSigner(config.SSHKeyPath)
		if err != nil {
			return nil, err
		}

		auth = append(auth, gossh.PublicKeys(signer))
	}

	return &gossh.ClientConfig{
		User: config.SSHUser,
		Auth: auth,
	}, nil
}




func execute_ssh_cmd (cmd, host, port, username, password string) (stdout string, err error) {
    // Setup connection config
    config := &gossh.ClientConfig {
        User: username,
        Auth: []gossh.AuthMethod {
            gossh.Password(password),
        },
    }

    client, err := gossh.Dial("tcp", host + ":" + port, config)

    if err != nil {
        return "", err
    }

    //Create session
    session, err := client.NewSession()

    if err != nil {
        return "", err
    }

    defer session.Close()

    var b bytes.Buffer
    session.Stdout = &b
    if err := session.Run(cmd); err != nil {
        return "", err
    }

    session.Close()
    return strings.Trim(b.String(), "\n"), nil
}

func forward(local_conn net.Conn, config *gossh.ClientConfig, server, remote_dest string, remote_port uint) {
    ssh_client_conn, err := gossh.Dial("tcp", server + ":22", config)
    if err != nil {
        log.Fatalf("local ssh.Dial error: %s", err)
    }

    remote_loc := fmt.Sprintf("%s:%d", remote_dest, remote_port)
    ssh_conn, err := ssh_client_conn.Dial("tcp", remote_loc) 
    if err != nil {
        log.Fatalf("ssh.Dial error: %s", err)
    }

    go func() {
        _, err = io.Copy(ssh_conn, local_conn)
        if err != nil {
            log.Fatalf("io.copy failed: %v", err)
        }
    }()

    go func() {
        _, err = io.Copy(local_conn, ssh_conn)
        if err != nil {
            log.Fatalf("io.copy failed: %v", err)
        }
    }()
}

func ssh_port_forward(local_port uint, remote_port uint, remote_dest, host, username, password string) (err error) {

    config := &gossh.ClientConfig {
        User: username,
        Auth: []gossh.AuthMethod{
            gossh.Password(password),
        },
    }

    // Listen on a local port
    local_listener, err := net.Listen("tcp",
                                      fmt.Sprintf("%s:%d",
                                                  "127.0.0.1",
                                                  local_port))
    if err != nil {
        log.Fatalf("Local listen failed: %s", err)
        return err
    }

    for {
        local_connection, err := local_listener.Accept()

        if err != nil {
            log.Fatalf("Local accept failed: %s", err)
            return err
        }


        // Forward to a remote port
        go forward(local_connection, config, host, remote_dest, remote_port)
    }



    return nil
}