/*
Copyright (c) Edgeless Systems GmbH

SPDX-License-Identifier: AGPL-3.0-only
*/

package cmd

import (
	"bytes"
	"testing"

	"github.com/edgelesssys/constellation/v2/internal/cloud/cloudprovider"
	"github.com/edgelesssys/constellation/v2/internal/config"
	"github.com/edgelesssys/constellation/v2/internal/constants"
	"github.com/edgelesssys/constellation/v2/internal/file"
	"github.com/edgelesssys/constellation/v2/internal/logger"
	"github.com/edgelesssys/constellation/v2/internal/versions"
	"github.com/spf13/afero"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"golang.org/x/mod/semver"
	"gopkg.in/yaml.v3"
)

func TestConfigGenerateKubernetesVersion(t *testing.T) {
	testCases := map[string]struct {
		version string
		wantErr bool
	}{
		"success": {
			version: semver.MajorMinor(string(versions.Default)),
		},
		"no semver": {
			version: "asdf",
			wantErr: true,
		},
		"not supported": {
			version: "1111",
			wantErr: true,
		},
	}

	for name, tc := range testCases {
		t.Run(name, func(t *testing.T) {
			assert := assert.New(t)
			require := require.New(t)

			fileHandler := file.NewHandler(afero.NewMemMapFs())
			cmd := newConfigGenerateCmd()
			err := cmd.Flags().Set("kubernetes", tc.version)
			require.NoError(err)

			cg := &configGenerateCmd{log: logger.NewTest(t)}
			err = cg.configGenerate(cmd, fileHandler, cloudprovider.Unknown)

			if tc.wantErr {
				assert.Error(err)
				return
			}
			assert.NoError(err)
		})
	}
}

func TestConfigGenerateDefault(t *testing.T) {
	assert := assert.New(t)
	require := require.New(t)

	fileHandler := file.NewHandler(afero.NewMemMapFs())
	cmd := newConfigGenerateCmd()

	cg := &configGenerateCmd{log: logger.NewTest(t)}
	require.NoError(cg.configGenerate(cmd, fileHandler, cloudprovider.Unknown))

	var readConfig config.Config
	err := fileHandler.ReadYAML(constants.ConfigFilename, &readConfig)
	assert.NoError(err)
	assert.Equal(*config.Default(), readConfig)
}

func TestConfigGenerateDefaultGCPSpecific(t *testing.T) {
	assert := assert.New(t)
	require := require.New(t)

	fileHandler := file.NewHandler(afero.NewMemMapFs())
	cmd := newConfigGenerateCmd()

	wantConf := config.Default()
	wantConf.RemoveProviderExcept(cloudprovider.GCP)

	cg := &configGenerateCmd{log: logger.NewTest(t)}
	require.NoError(cg.configGenerate(cmd, fileHandler, cloudprovider.GCP))

	var readConfig config.Config
	err := fileHandler.ReadYAML(constants.ConfigFilename, &readConfig)
	assert.NoError(err)
	assert.Equal(*wantConf, readConfig)
}

func TestConfigGenerateDefaultExists(t *testing.T) {
	require := require.New(t)

	fileHandler := file.NewHandler(afero.NewMemMapFs())
	require.NoError(fileHandler.Write(constants.ConfigFilename, []byte("foobar"), file.OptNone))
	cmd := newConfigGenerateCmd()

	cg := &configGenerateCmd{log: logger.NewTest(t)}
	require.Error(cg.configGenerate(cmd, fileHandler, cloudprovider.Unknown))
}

func TestConfigGenerateFileFlagRemoved(t *testing.T) {
	require := require.New(t)

	fileHandler := file.NewHandler(afero.NewMemMapFs())
	cmd := newConfigGenerateCmd()
	cmd.ResetFlags()

	cg := &configGenerateCmd{log: logger.NewTest(t)}
	require.Error(cg.configGenerate(cmd, fileHandler, cloudprovider.Unknown))
}

func TestConfigGenerateStdOut(t *testing.T) {
	assert := assert.New(t)
	require := require.New(t)

	fileHandler := file.NewHandler(afero.NewMemMapFs())

	var outBuffer bytes.Buffer
	cmd := newConfigGenerateCmd()
	cmd.SetOut(&outBuffer)
	require.NoError(cmd.Flags().Set("file", "-"))

	cg := &configGenerateCmd{log: logger.NewTest(t)}
	require.NoError(cg.configGenerate(cmd, fileHandler, cloudprovider.Unknown))

	var readConfig config.Config
	require.NoError(yaml.NewDecoder(&outBuffer).Decode(&readConfig))

	assert.Equal(*config.Default(), readConfig)
}