// Copyright (C) 2016 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.

package main

import (
	"bytes"
	"compress/gzip"
	"io/ioutil"
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/d4l3k/messagediff"
	"github.com/syncthing/syncthing/lib/config"
	"github.com/syncthing/syncthing/lib/protocol"
	"github.com/syncthing/syncthing/lib/sync"
	"github.com/thejerf/suture"
)

func TestCSRFToken(t *testing.T) {
	t1 := newCsrfToken()
	t2 := newCsrfToken()

	t3 := newCsrfToken()
	if !validCsrfToken(t3) {
		t.Fatal("t3 should be valid")
	}

	for i := 0; i < 250; i++ {
		if i%5 == 0 {
			// t1 and t2 should remain valid by virtue of us checking them now
			// and then.
			if !validCsrfToken(t1) {
				t.Fatal("t1 should be valid at iteration", i)
			}
			if !validCsrfToken(t2) {
				t.Fatal("t2 should be valid at iteration", i)
			}
		}

		// The newly generated token is always valid
		t4 := newCsrfToken()
		if !validCsrfToken(t4) {
			t.Fatal("t4 should be valid at iteration", i)
		}
	}

	if validCsrfToken(t3) {
		t.Fatal("t3 should have expired by now")
	}
}

func TestStopAfterBrokenConfig(t *testing.T) {
	baseDirs["config"] = "../../test/h1" // to load HTTPS keys
	expandLocations()

	cfg := config.Configuration{
		GUI: config.GUIConfiguration{
			RawAddress: "127.0.0.1:0",
			RawUseTLS:  false,
		},
	}
	w := config.Wrap("/dev/null", cfg)

	srv, err := newAPIService(protocol.LocalDeviceID, w, "", nil, nil, nil, nil, nil, nil)
	if err != nil {
		t.Fatal(err)
	}
	srv.started = make(chan struct{})

	sup := suture.NewSimple("test")
	sup.Add(srv)
	sup.ServeBackground()

	<-srv.started

	// Service is now running, listening on a random port on localhost. Now we
	// request a config change to a completely invalid listen address. The
	// commit will fail and the service will be in a broken state.

	newCfg := config.Configuration{
		GUI: config.GUIConfiguration{
			RawAddress: "totally not a valid address",
			RawUseTLS:  false,
		},
	}
	if srv.CommitConfiguration(cfg, newCfg) {
		t.Fatal("Config commit should have failed")
	}

	// Nonetheless, it should be fine to Stop() it without panic.

	sup.Stop()
}

func TestAssetsDir(t *testing.T) {
	// For any given request to $FILE, we should return the first found of
	//  - assetsdir/$THEME/$FILE
	//  - compiled in asset $THEME/$FILE
	//  - assetsdir/default/$FILE
	//  - compiled in asset default/$FILE

	// The asset map contains compressed assets, so create a couple of gzip compressed assets here.
	buf := new(bytes.Buffer)
	gw := gzip.NewWriter(buf)
	gw.Write([]byte("default"))
	gw.Close()
	def := buf.Bytes()

	buf = new(bytes.Buffer)
	gw = gzip.NewWriter(buf)
	gw.Write([]byte("foo"))
	gw.Close()
	foo := buf.Bytes()

	e := embeddedStatic{
		theme:    "foo",
		mut:      sync.NewRWMutex(),
		assetDir: "testdata",
		assets: map[string][]byte{
			"foo/a":     foo, // overridden in foo/a
			"foo/b":     foo,
			"default/a": def, // overridden in default/a (but foo/a takes precedence)
			"default/b": def, // overridden in default/b (but foo/b takes precedence)
			"default/c": def,
		},
	}

	s := httptest.NewServer(e)
	defer s.Close()

	// assetsdir/foo/a exists, overrides compiled in
	expectURLToContain(t, s.URL+"/a", "overridden-foo")

	// foo/b is compiled in, default/b is overriden, return compiled in
	expectURLToContain(t, s.URL+"/b", "foo")

	// only exists as compiled in default/c so use that
	expectURLToContain(t, s.URL+"/c", "default")

	// only exists as overriden default/d so use that
	expectURLToContain(t, s.URL+"/d", "overridden-default")
}

func expectURLToContain(t *testing.T, url, exp string) {
	res, err := http.Get(url)
	if err != nil {
		t.Error(err)
		return
	}

	if res.StatusCode != 200 {
		t.Errorf("Got %s instead of 200 OK", res.Status)
		return
	}

	data, err := ioutil.ReadAll(res.Body)
	res.Body.Close()
	if err != nil {
		t.Error(err)
		return
	}

	if string(data) != exp {
		t.Errorf("Got %q instead of %q on %q", data, exp, url)
		return
	}
}

func TestDirNames(t *testing.T) {
	names := dirNames("testdata")
	expected := []string{"default", "foo", "testfolder"}
	if diff, equal := messagediff.PrettyDiff(expected, names); !equal {
		t.Errorf("Unexpected dirNames return: %#v\n%s", names, diff)
	}
}