// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// See https://code.google.com/p/go/source/browse/CONTRIBUTORS
// Licensed under the same terms as Go itself:
// https://code.google.com/p/go/source/browse/LICENSE

package http2

import (
	"errors"
	"fmt"
	"io"
	"net/http"
	"net/http/httptest"
	"os/exec"
	"strconv"
	"strings"
	"sync/atomic"
	"testing"
	"time"
)

func TestServer(t *testing.T) {
	requireCurl(t)

	ts := httptest.NewUnstartedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		io.WriteString(w, "Hello, test.")
	}))
	ConfigureServer(ts.Config, &Server{})
	ts.TLS = ts.Config.TLSConfig // the httptest.Server has its own copy of this TLS config
	ts.StartTLS()
	defer ts.Close()

	var gotConn int32
	testHookOnConn = func() { atomic.StoreInt32(&gotConn, 1) }

	t.Logf("Running test server for curl to hit at: %s", ts.URL)
	container := curl(t, "--silent", "--http2", "--insecure", "-v", ts.URL)
	defer kill(container)
	resc := make(chan interface{}, 1)
	go func() {
		res, err := dockerLogs(container)
		if err != nil {
			resc <- err
		} else {
			resc <- res
		}
	}()
	select {
	case res := <-resc:
		if err, ok := res.(error); ok {
			t.Fatal(err)
		}
		t.Logf("Got: %s", res)
	case <-time.After(3 * time.Second):
		t.Errorf("timeout waiting for curl")
	}

	if atomic.LoadInt32(&gotConn) == 0 {
		t.Error("never saw an http2 connection")
	}
}

func dockerLogs(container string) ([]byte, error) {
	out, err := exec.Command("docker", "wait", container).CombinedOutput()
	if err != nil {
		return out, err
	}
	exitStatus, err := strconv.Atoi(strings.TrimSpace(string(out)))
	if err != nil {
		return out, errors.New("unexpected exit status from docker wait")
	}
	out, err = exec.Command("docker", "logs", container).CombinedOutput()
	exec.Command("docker", "rm", container).Run()
	if err == nil && exitStatus != 0 {
		err = fmt.Errorf("exit status %d", exitStatus)
	}
	return out, err
}

func kill(container string) {
	exec.Command("docker", "kill", container).Run()
	exec.Command("docker", "rm", container).Run()
}

// Verify that curl has http2.
func requireCurl(t *testing.T) {
	out, err := dockerLogs(curl(t, "--version"))
	if err != nil {
		t.Skipf("failed to determine curl features; skipping test")
	}
	if !strings.Contains(string(out), "HTTP2") {
		t.Skip("curl doesn't support HTTP2; skipping test")
	}
}

func curl(t *testing.T, args ...string) (container string) {
	out, err := exec.Command("docker", append([]string{"run", "-d", "--net=host", "gohttp2/curl"}, args...)...).CombinedOutput()
	if err != nil {
		t.Fatalf("Failed to run curl in docker: %v, %s", err, out)
	}
	return strings.TrimSpace(string(out))
}