/*
   Copyright Docker attest authors

   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 tuf

import (
	"fmt"
	"os"
	"path/filepath"
	"testing"

	"github.com/Masterminds/semver/v3"
	"github.com/docker/attest/internal/test"
	"github.com/docker/attest/version"
	"github.com/stretchr/testify/assert"
)

const (
	invalidVersion    = "0.0.1"
	validVersion      = "v1.0.0-0"
	versionConstraint = ">=v1.0.0-0"
)

func TestDefaultVersionChecker(t *testing.T) {
	testDir := test.CreateTempDir(t, "", "tuf_temp")
	versionConstraintsPath := filepath.Join(testDir, "version-constraints")
	err := os.WriteFile(versionConstraintsPath, []byte(versionConstraint), 0o600)
	assert.NoError(t, err)
	tufClient := NewMockTufClient(testDir)

	expectedError := fmt.Sprintf("%s version %s does not satisfy constraints %s: %s is less than %s", version.ThisModulePath, invalidVersion, versionConstraint, invalidVersion, validVersion)

	testCases := []struct {
		name          string
		expectedError string
		version       string
	}{
		{name: "version is less than the minimum", expectedError: expectedError, version: "0.0.1"},
		{name: "version is equal to the minimum", version: "1.0.0"},
		{name: "version is greater than the minimum", version: "1.0.1"},
	}

	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			checker := NewDefaultVersionChecker()
			checker.VersionFetcher = &MockVersionFetcher{version: tc.version}
			err := checker.CheckVersion(tufClient)
			if tc.expectedError != "" {
				assert.Error(t, err)
				assert.Equal(t, tc.expectedError, err.Error())
				return
			}
			assert.NoError(t, err)
		})
	}
}

type MockVersionFetcher struct {
	version string
}

func (m *MockVersionFetcher) Get() (*semver.Version, error) {
	return semver.NewVersion(m.version)
}