package tests

import (
	scp "github.com/bramvdbogaerde/go-scp"
	"github.com/bramvdbogaerde/go-scp/auth"
	"golang.org/x/crypto/ssh"
	"io/ioutil"
	"os"
	"strings"
	"testing"
)

// This test, tests the basic functionality of the library: copying files
// it assumes that a docker container is running an SSH server at port
// 2244 using password authentication.
//
// It also assumes that the directory /results is writable within that container
// and is mapped to the tmp/ directory within this directory.
func TestCopy(t *testing.T) {
	// Use SSH key authentication from the auth package
	// we ignore the host key in this example, please change this if you use this library
	clientConfig, _ := auth.PasswordKey("bram", "test", ssh.InsecureIgnoreHostKey())

	// For other authentication methods see ssh.ClientConfig and ssh.AuthMethod

	// Create a new SCP client
	client := scp.NewClient("127.0.0.1:2244", &clientConfig)

	// Connect to the remote server
	err := client.Connect()
	if err != nil {
		t.Errorf("Couldn't establish a connection to the remote server %s", err)
		return
	}

	// Open a file
	f, _ := os.Open("./input.txt")

	// Close client connection after the file has been copied
	defer client.Close()

	// Close the file after it has been copied
	defer f.Close()

	// Finaly, copy the file over
	// Usage: CopyFile(fileReader, remotePath, permission)

	err = client.CopyFile(f, "/data/output.txt", "0655")

	if err != nil {
		t.Errorf("Error while copying file %s", err)
	}

	content, err := ioutil.ReadFile("./tmp/output.txt")
	if err != nil {
		t.Errorf("Test has failed, file could not be opened")
	}

	text := string(content)
	expected := "It Works\n"
	if strings.Compare(text, expected) != 0 {
		t.Errorf("Got different text than expected, expected \"%s\" got, \"%s\"", expected, text)
	}
}

// This test assumes that a Docker container is running that has the SCP binary available
// and exposes an SSH server on port 2244 using password authentication.
//
// The test checks whether it can retrieve a file from the remote and checks the file against the expected file
func TestDownloadFile(t *testing.T) {
	// Use SSH key authentication from the auth package
	// we ignore the host key in this example, please change this if you use this library
	clientConfig, _ := auth.PasswordKey("bram", "test", ssh.InsecureIgnoreHostKey())

	// For other authentication methods see ssh.ClientConfig and ssh.AuthMethod

	// Create a new SCP client
	client := scp.NewClient("127.0.0.1:2244", &clientConfig)

	// Connect to the remote server
	err := client.Connect()
	if err != nil {
		t.Errorf("Couldn't establish a connection to the remote server %s", err)
		return
	}

	f, err := os.OpenFile("./tmp/output.txt", os.O_RDWR|os.O_CREATE, 0755)
	if err != nil {
		t.Errorf("Couldn't open the output file")
	}

	// Close client connection after the file has been copied
	defer client.Close()

	// Close the file after it has been copied
	defer f.Close()

	err = client.CopyFromRemote(f, "/input/test_download.txt")
	if err != nil {
		t.Errorf("Copy failed from remote")
	}

	content, err := ioutil.ReadFile("./tmp/output.txt")
	text := string(content)
	expected := "It works for download!\n"
	if strings.Compare(text, expected) != 0 {
		t.Errorf("Got different text than expected, expected \"%s\" got, \"%s\"", expected, text)
	}
}