package docker
 
 import (
 	"bufio"
 	"fmt"
 	"io"

 	_ "io/ioutil"

 	"strings"
 	"testing"
 	"time"
 )
 
 func closeWrap(args ...io.Closer) error {
 	e := false
 	ret := fmt.Errorf("Error closing elements")
 	for _, c := range args {
 		if err := c.Close(); err != nil {
 			e = true
 			ret = fmt.Errorf("%s\n%s", ret, err)
 		}
 	}
 	if e {
 		return ret
 	}
 	return nil
 }
 

 func setTimeout(t *testing.T, msg string, d time.Duration, f func()) {

 	c := make(chan bool)
 
 	// Make sure we are not too long
 	go func() {
 		time.Sleep(d)
 		c <- true
 	}()

 	go func() {
 		f()
 		c <- false
 	}()
 	if <-c {
 		t.Fatal(msg)

 	}
 }
 
 func assertPipe(input, output string, r io.Reader, w io.Writer, count int) error {
 	for i := 0; i < count; i++ {
 		if _, err := w.Write([]byte(input)); err != nil {
 			return err
 		}
 		o, err := bufio.NewReader(r).ReadString('\n')
 		if err != nil {
 			return err
 		}
 		if strings.Trim(o, " \r\n") != output {
 			return fmt.Errorf("Unexpected output. Expected [%s], received [%s]", output, o)
 		}
 	}
 	return nil
 }
 

 /*TODO

 func cmdWait(srv *Server, container *Container) error {
 	stdout, stdoutPipe := io.Pipe()
 
 	go func() {
 		srv.CmdWait(nil, stdoutPipe, container.Id)
 	}()
 
 	if _, err := bufio.NewReader(stdout).ReadString('\n'); err != nil {
 		return err
 	}
 	// Cleanup pipes
 	return closeWrap(stdout, stdoutPipe)
 }
 

 func cmdImages(srv *Server, args ...string) (string, error) {
 	stdout, stdoutPipe := io.Pipe()
 
 	go func() {
 		if err := srv.CmdImages(nil, stdoutPipe, args...); err != nil {
 			return
 		}
 
 		// force the pipe closed, so that the code below gets an EOF
 		stdoutPipe.Close()
 	}()
 
 	output, err := ioutil.ReadAll(stdout)
 	if err != nil {
 		return "", err
 	}
 
 	// Cleanup pipes
 	return string(output), closeWrap(stdout, stdoutPipe)
 }
 
 // TestImages checks that 'docker images' displays information correctly
 func TestImages(t *testing.T) {
 
 	runtime, err := newTestRuntime()
 	if err != nil {
 		t.Fatal(err)
 	}
 	defer nuke(runtime)
 
 	srv := &Server{runtime: runtime}
 
 	output, err := cmdImages(srv)
 
 	if !strings.Contains(output, "REPOSITORY") {
 		t.Fatal("'images' should have a header")
 	}
 	if !strings.Contains(output, "docker-ut") {
 		t.Fatal("'images' should show the docker-ut image")
 	}
 	if !strings.Contains(output, "e9aa60c60128") {
 		t.Fatal("'images' should show the docker-ut image id")
 	}
 
 	output, err = cmdImages(srv, "-q")
 
 	if strings.Contains(output, "REPOSITORY") {
 		t.Fatal("'images -q' should not have a header")
 	}
 	if strings.Contains(output, "docker-ut") {
 		t.Fatal("'images' should not show the docker-ut image name")
 	}
 	if !strings.Contains(output, "e9aa60c60128") {
 		t.Fatal("'images' should show the docker-ut image id")
 	}
 
 	output, err = cmdImages(srv, "-viz")
 
 	if !strings.HasPrefix(output, "digraph docker {") {
 		t.Fatal("'images -v' should start with the dot header")
 	}
 	if !strings.HasSuffix(output, "}\n") {
 		t.Fatal("'images -v' should end with a '}'")
 	}
 	if !strings.Contains(output, "base -> \"e9aa60c60128\" [style=invis]") {
 		t.Fatal("'images -v' should have the docker-ut image id node")
 	}
 
 	// todo: add checks for -a
 }
 

 // TestRunHostname checks that 'docker run -h' correctly sets a custom hostname
 func TestRunHostname(t *testing.T) {

 	runtime, err := newTestRuntime()
 	if err != nil {
 		t.Fatal(err)
 	}
 	defer nuke(runtime)
 
 	srv := &Server{runtime: runtime}
 
 	stdin, _ := io.Pipe()
 	stdout, stdoutPipe := io.Pipe()
 
 	c := make(chan struct{})
 	go func() {
 		if err := srv.CmdRun(stdin, rcli.NewDockerLocalConn(stdoutPipe), "-h", "foobar", GetTestImage(runtime).Id, "hostname"); err != nil {
 			t.Fatal(err)
 		}
 		close(c)
 	}()
 	cmdOutput, err := bufio.NewReader(stdout).ReadString('\n')
 	if err != nil {
 		t.Fatal(err)
 	}
 	if cmdOutput != "foobar\n" {
 		t.Fatalf("'hostname' should display '%s', not '%s'", "foobar\n", cmdOutput)
 	}
 
 	setTimeout(t, "CmdRun timed out", 2*time.Second, func() {
 		<-c

 		cmdWait(srv, srv.runtime.List()[0])

 	})

 }
 

 func TestRunExit(t *testing.T) {
 	runtime, err := newTestRuntime()
 	if err != nil {
 		t.Fatal(err)
 	}
 	defer nuke(runtime)
 
 	srv := &Server{runtime: runtime}
 
 	stdin, stdinPipe := io.Pipe()
 	stdout, stdoutPipe := io.Pipe()
 	c1 := make(chan struct{})
 	go func() {

 		srv.CmdRun(stdin, rcli.NewDockerLocalConn(stdoutPipe), "-i", GetTestImage(runtime).Id, "/bin/cat")

 		close(c1)
 	}()
 
 	setTimeout(t, "Read/Write assertion timed out", 2*time.Second, func() {
 		if err := assertPipe("hello\n", "hello", stdout, stdinPipe, 15); err != nil {
 			t.Fatal(err)
 		}
 	})
 
 	container := runtime.List()[0]
 
 	// Closing /bin/cat stdin, expect it to exit
 	p, err := container.StdinPipe()
 	if err != nil {
 		t.Fatal(err)
 	}
 	if err := p.Close(); err != nil {
 		t.Fatal(err)
 	}
 
 	// as the process exited, CmdRun must finish and unblock. Wait for it
 	setTimeout(t, "Waiting for CmdRun timed out", 2*time.Second, func() {
 		<-c1

 		cmdWait(srv, container)

 	})
 
 	// Make sure that the client has been disconnected
 	setTimeout(t, "The client should have been disconnected once the remote process exited.", 2*time.Second, func() {

 		// Expecting pipe i/o error, just check that read does not block
 		stdin.Read([]byte{})

 	})
 
 	// Cleanup pipes
 	if err := closeWrap(stdin, stdinPipe, stdout, stdoutPipe); err != nil {
 		t.Fatal(err)
 	}
 }
 

 // Expected behaviour: the process dies when the client disconnects
 func TestRunDisconnect(t *testing.T) {

 	runtime, err := newTestRuntime()
 	if err != nil {
 		t.Fatal(err)
 	}
 	defer nuke(runtime)
 

 	srv := &Server{runtime: runtime}

 	stdin, stdinPipe := io.Pipe()
 	stdout, stdoutPipe := io.Pipe()
 	c1 := make(chan struct{})
 	go func() {

 		// We're simulating a disconnect so the return value doesn't matter. What matters is the
 		// fact that CmdRun returns.

 		srv.CmdRun(stdin, rcli.NewDockerLocalConn(stdoutPipe), "-i", GetTestImage(runtime).Id, "/bin/cat")

 		close(c1)
 	}()

 	setTimeout(t, "Read/Write assertion timed out", 2*time.Second, func() {

 		if err := assertPipe("hello\n", "hello", stdout, stdinPipe, 15); err != nil {
 			t.Fatal(err)
 		}

 	})

 	// Close pipes (simulate disconnect)
 	if err := closeWrap(stdin, stdinPipe, stdout, stdoutPipe); err != nil {
 		t.Fatal(err)

 	}
 
 	// as the pipes are close, we expect the process to die,
 	// therefore CmdRun to unblock. Wait for CmdRun
 	setTimeout(t, "Waiting for CmdRun timed out", 2*time.Second, func() {
 		<-c1
 	})
 
 	// Client disconnect after run -i should cause stdin to be closed, which should
 	// cause /bin/cat to exit.
 	setTimeout(t, "Waiting for /bin/cat to exit timed out", 2*time.Second, func() {
 		container := runtime.List()[0]
 		container.Wait()
 		if container.State.Running {
 			t.Fatalf("/bin/cat is still running after closing stdin")
 		}
 	})
 }
 
 // Expected behaviour: the process dies when the client disconnects
 func TestRunDisconnectTty(t *testing.T) {
 	runtime, err := newTestRuntime()
 	if err != nil {
 		t.Fatal(err)
 	}
 	defer nuke(runtime)
 
 	srv := &Server{runtime: runtime}
 
 	stdin, stdinPipe := io.Pipe()
 	stdout, stdoutPipe := io.Pipe()
 	c1 := make(chan struct{})
 	go func() {
 		// We're simulating a disconnect so the return value doesn't matter. What matters is the
 		// fact that CmdRun returns.
 		srv.CmdRun(stdin, rcli.NewDockerLocalConn(stdoutPipe), "-i", "-t", GetTestImage(runtime).Id, "/bin/cat")
 		close(c1)
 	}()
 

 	setTimeout(t, "Waiting for the container to be started timed out", 2*time.Second, func() {
 		for {
 			// Client disconnect after run -i should keep stdin out in TTY mode
 			l := runtime.List()
 			if len(l) == 1 && l[0].State.Running {
 				break
 			}
 
 			time.Sleep(10 * time.Millisecond)
 		}
 	})
 
 	// Client disconnect after run -i should keep stdin out in TTY mode
 	container := runtime.List()[0]
 

 	setTimeout(t, "Read/Write assertion timed out", 2*time.Second, func() {
 		if err := assertPipe("hello\n", "hello", stdout, stdinPipe, 15); err != nil {
 			t.Fatal(err)
 		}
 	})
 
 	// Close pipes (simulate disconnect)
 	if err := closeWrap(stdin, stdinPipe, stdout, stdoutPipe); err != nil {
 		t.Fatal(err)

 	}

 	// In tty mode, we expect the process to stay alive even after client's stdin closes.
 	// Do not wait for run to finish

 	// Give some time to monitor to do his thing
 	container.WaitTimeout(500 * time.Millisecond)
 	if !container.State.Running {
 		t.Fatalf("/bin/cat should  still be running after closing stdin (tty mode)")
 	}

 }

 // TestAttachStdin checks attaching to stdin without stdout and stderr.
 // 'docker run -i -a stdin' should sends the client's stdin to the command,
 // then detach from it and print the container id.

 func TestRunAttachStdin(t *testing.T) {
 	runtime, err := newTestRuntime()
 	if err != nil {
 		t.Fatal(err)
 	}
 	defer nuke(runtime)
 	srv := &Server{runtime: runtime}
 
 	stdin, stdinPipe := io.Pipe()
 	stdout, stdoutPipe := io.Pipe()
 
 	ch := make(chan struct{})
 	go func() {
 		srv.CmdRun(stdin, rcli.NewDockerLocalConn(stdoutPipe), "-i", "-a", "stdin", GetTestImage(runtime).Id, "sh", "-c", "echo hello; cat")
 		close(ch)
 	}()
 
 	// Send input to the command, close stdin
 	setTimeout(t, "Write timed out", 2*time.Second, func() {
 		if _, err := stdinPipe.Write([]byte("hi there\n")); err != nil {
 			t.Fatal(err)
 		}
 		if err := stdinPipe.Close(); err != nil {
 			t.Fatal(err)
 		}
 	})
 
 	container := runtime.List()[0]
 
 	// Check output
 	cmdOutput, err := bufio.NewReader(stdout).ReadString('\n')
 	if err != nil {
 		t.Fatal(err)
 	}
 	if cmdOutput != container.ShortId()+"\n" {
 		t.Fatalf("Wrong output: should be '%s', not '%s'\n", container.ShortId()+"\n", cmdOutput)
 	}
 
 	// wait for CmdRun to return
 	setTimeout(t, "Waiting for CmdRun timed out", 2*time.Second, func() {
 		<-ch
 	})
 
 	setTimeout(t, "Waiting for command to exit timed out", 2*time.Second, func() {
 		container.Wait()
 	})
 
 	// Check logs
 	if cmdLogs, err := container.ReadLog("stdout"); err != nil {
 		t.Fatal(err)
 	} else {
 		if output, err := ioutil.ReadAll(cmdLogs); err != nil {
 			t.Fatal(err)
 		} else {
 			expectedLog := "hello\nhi there\n"
 			if string(output) != expectedLog {
 				t.Fatalf("Unexpected logs: should be '%s', not '%s'\n", expectedLog, output)
 			}
 		}
 	}

 }

 
 // Expected behaviour, the process stays alive when the client disconnects
 func TestAttachDisconnect(t *testing.T) {
 	runtime, err := newTestRuntime()
 	if err != nil {
 		t.Fatal(err)
 	}
 	defer nuke(runtime)
 
 	srv := &Server{runtime: runtime}
 

 	container, err := NewBuilder(runtime).Create(

 		&Config{
 			Image:     GetTestImage(runtime).Id,

 			CpuShares: 1000,

 			Memory:    33554432,
 			Cmd:       []string{"/bin/cat"},
 			OpenStdin: true,
 		},
 	)
 	if err != nil {
 		t.Fatal(err)
 	}
 	defer runtime.Destroy(container)
 
 	// Start the process
 	if err := container.Start(); err != nil {
 		t.Fatal(err)
 	}
 
 	stdin, stdinPipe := io.Pipe()
 	stdout, stdoutPipe := io.Pipe()
 
 	// Attach to it
 	c1 := make(chan struct{})
 	go func() {

 		// We're simulating a disconnect so the return value doesn't matter. What matters is the
 		// fact that CmdAttach returns.

 		srv.CmdAttach(stdin, rcli.NewDockerLocalConn(stdoutPipe), container.Id)

 		close(c1)
 	}()
 
 	setTimeout(t, "First read/write assertion timed out", 2*time.Second, func() {
 		if err := assertPipe("hello\n", "hello", stdout, stdinPipe, 15); err != nil {
 			t.Fatal(err)
 		}
 	})
 	// Close pipes (client disconnects)
 	if err := closeWrap(stdin, stdinPipe, stdout, stdoutPipe); err != nil {
 		t.Fatal(err)
 	}
 
 	// Wait for attach to finish, the client disconnected, therefore, Attach finished his job
 	setTimeout(t, "Waiting for CmdAttach timed out", 2*time.Second, func() {
 		<-c1
 	})

 	// We closed stdin, expect /bin/cat to still be running
 	// Wait a little bit to make sure container.monitor() did his thing
 	err = container.WaitTimeout(500 * time.Millisecond)
 	if err == nil || !container.State.Running {
 		t.Fatalf("/bin/cat is not running after closing stdin")
 	}
 
 	// Try to avoid the timeoout in destroy. Best effort, don't check error
 	cStdin, _ := container.StdinPipe()
 	cStdin.Close()

 	container.Wait()

 }

 */