package reverse_test

import (
	"io/ioutil"
	"os"
	"syscall"
	"testing"

	"github.com/rfjakob/gocryptfs/internal/ctlsock"
	"github.com/rfjakob/gocryptfs/tests/test_helpers"
)

func TestLongnameStat(t *testing.T) {
	fd, err := os.Create(dirA + "/" + x240)
	if err != nil {
		t.Fatal(err)
	}
	path := dirC + "/" + x240
	if !test_helpers.VerifyExistence(path) {
		t.Fail()
	}
	test_helpers.VerifySize(t, path, 0)
	_, err = fd.Write(make([]byte, 10))
	if err != nil {
		t.Fatal(err)
	}
	fd.Close()
	/*
		time.Sleep(1000 * time.Millisecond)
		test_helpers.VerifySize(t, path, 10)
	*/
}

func TestSymlinks(t *testing.T) {
	target := "/"
	os.Symlink(target, dirA+"/symlink")
	cSymlink := dirC + "/symlink"
	_, err := os.Lstat(cSymlink)
	if err != nil {
		t.Errorf("Lstat: %v", err)
	}
	_, err = os.Stat(cSymlink)
	if err != nil {
		t.Errorf("Stat: %v", err)
	}
	actualTarget, err := os.Readlink(cSymlink)
	if err != nil {
		t.Fatal(err)
	}
	if target != actualTarget {
		t.Errorf("wrong symlink target: want=%q have=%q", target, actualTarget)
	}
}

// Symbolic link dentry sizes should be set to the length of the string
// that contains the target path.
func TestSymlinkDentrySize(t *testing.T) {
	if plaintextnames {
		t.Skip("this only tests encrypted names")
	}
	symlink := "a_symlink"

	mnt, err := ioutil.TempDir(test_helpers.TmpDir, "reverse_mnt_")
	if err != nil {
		t.Fatal(err)
	}

	sock := mnt + ".sock"
	test_helpers.MountOrFatal(t, "ctlsock_reverse_test_fs", mnt, "-reverse", "-extpass", "echo test", "-ctlsock="+sock)
	defer test_helpers.UnmountPanic(mnt)

	req := ctlsock.RequestStruct{EncryptPath: symlink}
	symlinkResponse := test_helpers.QueryCtlSock(t, sock, req)
	if symlinkResponse.ErrNo != 0 {
		t.Errorf("Encrypt: %q ErrNo=%d ErrText=%s", symlink, symlinkResponse.ErrNo, symlinkResponse.ErrText)
	}

	fi, err := os.Lstat(mnt + "/" + symlinkResponse.Result)
	if err != nil {
		t.Errorf("Lstat: %v", err)
	}

	target, err := os.Readlink(mnt + "/" + symlinkResponse.Result)
	if err != nil {
		t.Errorf("Readlink: %v", err)
	}

	if fi.Size() != int64(len(target)) {
		t.Errorf("Lstat reports that symbolic link %q's dentry size is %d, but this does not "+
			"match the length of the string returned by readlink, which is %d.",
			symlink, fi.Size(), len(target))
	}
}

// .gocryptfs.reverse.conf in the plaintext dir should be visible as
// gocryptfs.conf
func TestConfigMapping(t *testing.T) {
	c := dirB + "/gocryptfs.conf"
	if !test_helpers.VerifyExistence(c) {
		t.Errorf("%s missing", c)
	}
	data, err := ioutil.ReadFile(c)
	if err != nil {
		t.Fatal(err)
	}
	if len(data) == 0 {
		t.Errorf("empty file")
	}
}

// Check that the access() syscall works on virtual files
func TestAccessVirtual(t *testing.T) {
	if plaintextnames {
		t.Skip("test makes no sense for plaintextnames")
	}
	var R_OK uint32 = 4
	var W_OK uint32 = 2
	var X_OK uint32 = 1
	fn := dirB + "/gocryptfs.diriv"
	err := syscall.Access(fn, R_OK)
	if err != nil {
		t.Errorf("%q should be readable, but got error: %v", fn, err)
	}
	err = syscall.Access(fn, W_OK)
	if err == nil {
		t.Errorf("should NOT be writeable")
	}
	err = syscall.Access(fn, X_OK)
	if err == nil {
		t.Errorf("should NOT be executable")
	}
}

// Opening a nonexistant file name should return ENOENT
// and not EBADMSG or EIO or anything else.
func TestEnoent(t *testing.T) {
	fn := dirB + "/TestEnoent"
	_, err := syscall.Open(fn, syscall.O_RDONLY, 0)
	if err != syscall.ENOENT {
		t.Errorf("want ENOENT, got: %v", err)
	}
}