// -*- Mode: Go; indent-tabs-mode: t -*-

/*
 * Copyright (C) 2016 Canonical Ltd
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package asserts_test

import (
	"os"
	"path/filepath"
	"syscall"

	. "gopkg.in/check.v1"

	"github.com/snapcore/snapd/asserts"
)

type fsBackstoreSuite struct{}

var _ = Suite(&fsBackstoreSuite{})

func (fsbss *fsBackstoreSuite) TestOpenOK(c *C) {
	// ensure umask is clean when creating the DB dir
	oldUmask := syscall.Umask(0)
	defer syscall.Umask(oldUmask)

	topDir := filepath.Join(c.MkDir(), "asserts-db")

	bs, err := asserts.OpenFSBackstore(topDir)
	c.Check(err, IsNil)
	c.Check(bs, NotNil)

	info, err := os.Stat(filepath.Join(topDir, "asserts-v0"))
	c.Assert(err, IsNil)
	c.Assert(info.IsDir(), Equals, true)
	c.Check(info.Mode().Perm(), Equals, os.FileMode(0775))
}

func (fsbss *fsBackstoreSuite) TestOpenCreateFail(c *C) {
	parent := filepath.Join(c.MkDir(), "var")
	topDir := filepath.Join(parent, "asserts-db")
	// make it not writable
	err := os.Mkdir(parent, 0555)
	c.Assert(err, IsNil)

	bs, err := asserts.OpenFSBackstore(topDir)
	c.Assert(err, ErrorMatches, "cannot create assert storage root: .*")
	c.Check(bs, IsNil)
}

func (fsbss *fsBackstoreSuite) TestOpenWorldWritableFail(c *C) {
	topDir := filepath.Join(c.MkDir(), "asserts-db")
	// make it world-writable
	oldUmask := syscall.Umask(0)
	os.MkdirAll(filepath.Join(topDir, "asserts-v0"), 0777)
	syscall.Umask(oldUmask)

	bs, err := asserts.OpenFSBackstore(topDir)
	c.Assert(err, ErrorMatches, "assert storage root unexpectedly world-writable: .*")
	c.Check(bs, IsNil)
}

func (fsbss *fsBackstoreSuite) TestPutOldRevision(c *C) {
	topDir := filepath.Join(c.MkDir(), "asserts-db")
	bs, err := asserts.OpenFSBackstore(topDir)
	c.Assert(err, IsNil)

	// Create two revisions of assertion.
	a0, err := asserts.Decode([]byte("type: test-only\n" +
		"authority-id: auth-id1\n" +
		"primary-key: foo\n" +
		"\n" +
		"openpgp c2ln"))
	c.Assert(err, IsNil)
	a1, err := asserts.Decode([]byte("type: test-only\n" +
		"authority-id: auth-id1\n" +
		"primary-key: foo\n" +
		"revision: 1\n" +
		"\n" +
		"openpgp c2ln"))
	c.Assert(err, IsNil)

	// Put newer revision, follwed by old revision.
	err = bs.Put(asserts.TestOnlyType, a1)
	c.Assert(err, IsNil)
	err = bs.Put(asserts.TestOnlyType, a0)

	c.Check(err, ErrorMatches, `revision 0 is older than current revision 1`)
	c.Check(err, DeepEquals, &asserts.RevisionError{Current: 1, Used: 0})
}
