/*
Copyright (c) 2017-2021 VMware, Inc. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package process

import (
	"bufio"
	"bytes"
	"context"
	"errors"
	"fmt"
	"io"
	"net/http"
	"net/http/httptest"
	"net/url"
	"strconv"
	"testing"
	"time"

	"github.com/vmware/govmomi/toolbox/vix"
)

func TestProcessFunction(t *testing.T) {
	m := NewManager()
	var pids []int64

	for i := 0; i <= 2; i++ {
		r := &vix.StartProgramRequest{
			ProgramPath: "test",
			Arguments:   strconv.Itoa(i),
		}

		pid, _ := m.Start(r, NewFunc(func(_ context.Context, arg string) error {
			rc, _ := strconv.Atoi(arg)
			if rc == 0 {
				return nil

			}
			return &Error{Err: errors.New("fail"), ExitCode: int32(rc)}
		}))

		if pid == 0 {
			t.Fatalf("no pid")
		}

		pids = append(pids, pid)
	}

	m.wg.Wait()

	_ = m.ListProcesses(pids)

	for i, pid := range pids {
		p := m.entries[pid]
		if p.ExitCode != int32(i) {
			t.Errorf("%d: %d != %d", pid, p.ExitCode, i)
		}
	}
}

func TestProcessCommand(t *testing.T) {
	m := NewManager()
	var pids []int64

	for i := 0; i <= 2; i++ {
		r := &vix.StartProgramRequest{
			ProgramPath: "/bin/bash",
			Arguments:   fmt.Sprintf(`-c "exit %d"`, i),
		}

		pid, _ := m.Start(r, New())
		pids = append(pids, pid)
	}

	m.wg.Wait()

	_ = m.ListProcesses(nil)

	for i, pid := range pids {
		p := m.entries[pid]
		if p.ExitCode != int32(i) {
			t.Errorf("%d: %d != %d", pid, p.ExitCode, i)
		}
	}

	r := &vix.StartProgramRequest{
		ProgramPath: shell,
	}

	shell = "/enoent/enoent"
	_, err := m.Start(r, New())
	if err == nil {
		t.Error("expected error")
	}
	shell = r.ProgramPath

	r.ProgramPath = "/enoent/enoent"
	_, err = m.Start(r, New())
	if err == nil {
		t.Error("expected error")
	}
}

func TestProcessKill(t *testing.T) {
	m := NewManager()
	var pids []int64

	procs := []struct {
		r *vix.StartProgramRequest
		p *Process
	}{
		{
			&vix.StartProgramRequest{
				ProgramPath: "test",
				Arguments:   "none",
			},
			NewFunc(func(ctx context.Context, _ string) error {
				select {
				case <-ctx.Done():
					return &Error{Err: ctx.Err(), ExitCode: 42}
				case <-time.After(time.Minute):
				}

				return nil
			}),
		},
		{
			&vix.StartProgramRequest{
				ProgramPath: "/bin/bash",
				Arguments:   fmt.Sprintf(`-c "while true; do sleep 1; done"`),
			},
			New(),
		},
	}

	for _, test := range procs {
		pid, err := m.Start(test.r, test.p)
		if err != nil {
			t.Fatal(err)
		}

		pids = append(pids, pid)
	}

	for {
		b := m.ListProcesses(pids)
		if bytes.Count(b, []byte("<proc>")) == len(pids) {
			break
		}

		<-time.After(time.Millisecond * 100)
	}

	for _, pid := range pids {
		if !m.Kill(pid) {
			t.Errorf("kill %d", pid)
		}
	}

	m.wg.Wait()

	for _, pid := range pids {
		p := m.entries[pid]

		if p.ExitCode == 0 {
			t.Errorf("%s: exit=%d", p.Name, p.ExitCode)
		}
	}

	if m.Kill(-1) {
		t.Error("kill -1")
	}
}

func TestProcessRemove(t *testing.T) {
	m := NewManager()

	m.expire = time.Millisecond

	r := &vix.StartProgramRequest{
		ProgramPath: "test",
	}

	pid, _ := m.Start(r, NewFunc(func(_ context.Context, arg string) error {
		return nil
	}))

	m.wg.Wait()

	<-time.After(m.expire * 20)
	// pid should be removed by now
	b := m.ListProcesses([]int64{pid})
	if len(b) != 0 {
		t.Error("expected 0 processes")
	}
}

func TestEscapeXML(t *testing.T) {
	tests := []struct {
		in  string
		out string
	}{
		{`echo "foo bar" > /dev/null`, "echo %22foo bar%22 %3E /dev/null"},
	}

	for i, test := range tests {
		e := EscapeXML.Replace(test.in)
		if e != test.out {
			t.Errorf("%d: %s != %s", i, e, test.out)
		}
	}
}

func TestProcessError(t *testing.T) {
	fault := errors.New("fail")
	var err error = &Error{Err: fault}

	if err.Error() != fault.Error() {
		t.Fatal()
	}
}

func TestProcessIO(t *testing.T) {
	m := NewManager()

	r := &vix.StartProgramRequest{
		ProgramPath: "/bin/date",
	}

	p := New().WithIO()

	_, err := m.Start(r, p)
	if err != nil {
		t.Fatal(err)
	}

	m.wg.Wait()

	var buf bytes.Buffer

	_, _ = io.Copy(&buf, p.IO.Out)

	if buf.Len() == 0 {
		t.Error("no data")
	}
}

type testRoundTripper struct {
	*Process
}

func (c *testRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
	req.Header.Set("Connection", "close") // we need the server to close the connection after 1 request

	err := req.Write(c.IO.In.Writer)
	if err != nil {
		return nil, err
	}

	_ = c.IO.In.Close()

	<-c.ctx.Done()

	return http.ReadResponse(bufio.NewReader(c.IO.Out), req)
}

func TestProcessRoundTripper(t *testing.T) {
	echo := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		_ = r.Write(w)
	}))

	u, _ := url.Parse(echo.URL)

	m := NewManager()

	r := &vix.StartProgramRequest{
		ProgramPath: "http.RoundTrip",
		Arguments:   u.Host,
	}

	p := NewRoundTrip()

	_, err := m.Start(r, p)
	if err != nil {
		t.Fatal(err)
	}

	res, err := (&http.Client{Transport: &testRoundTripper{p}}).Get(echo.URL)
	if err != nil {
		t.Logf("Err: %s", p.IO.Err.String())
		t.Fatal(err)
	}

	if res.ContentLength == 0 {
		t.Errorf("len=%d", res.ContentLength)
	}
}