/*
Copyright The Helm 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 action

import (
	"archive/tar"
	"compress/gzip"
	"errors"
	"io"
	"os"
	"path"
	"testing"
	"time"

	"github.com/Masterminds/semver/v3"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"helm.sh/helm/v4/internal/test/ensure"
)

func TestPassphraseFileFetcher(t *testing.T) {
	secret := "secret"
	directory := ensure.TempFile(t, "passphrase-file", []byte(secret))
	testPkg := NewPackage()

	fetcher, err := testPkg.passphraseFileFetcher(path.Join(directory, "passphrase-file"), nil)
	require.NoError(t, err, "Unable to create passphraseFileFetcher")

	passphrase, err := fetcher("key")
	require.NoError(t, err, "Unable to fetch passphrase")

	assert.Equal(t, secret, string(passphrase), "Expected %s got %s", secret, string(passphrase))
}

func TestPassphraseFileFetcher_WithLineBreak(t *testing.T) {
	secret := "secret"
	directory := ensure.TempFile(t, "passphrase-file", []byte(secret+"\n\n."))
	testPkg := NewPackage()

	fetcher, err := testPkg.passphraseFileFetcher(path.Join(directory, "passphrase-file"), nil)
	require.NoError(t, err, "Unable to create passphraseFileFetcher")

	passphrase, err := fetcher("key")
	require.NoError(t, err, "Unable to fetch passphrase")

	assert.Equal(t, secret, string(passphrase), "Expected %s got %s", secret, string(passphrase))
}

func TestPassphraseFileFetcher_WithInvalidStdin(t *testing.T) {
	directory := t.TempDir()
	testPkg := NewPackage()

	stdin, err := os.CreateTemp(directory, "non-existing")
	require.NoError(t, err, "Unable to create test file")

	_, err = testPkg.passphraseFileFetcher("-", stdin)
	assert.Error(t, err, "Expected passphraseFileFetcher returning an error")
}

func TestPassphraseFileFetcher_WithStdinAndMultipleFetches(t *testing.T) {
	testPkg := NewPackage()
	stdin, w, err := os.Pipe()
	require.NoError(t, err, "Unable to create pipe")

	passphrase := "secret-from-stdin"

	go func() {
		_, err := w.WriteString(passphrase + "\n")
		assert.NoError(t, err)
	}()

	for range 4 {
		fetcher, err := testPkg.passphraseFileFetcher("-", stdin)
		require.NoError(t, err, "Expected passphraseFileFetcher to not return an error")

		pass, err := fetcher("key")
		require.NoError(t, err, "Expected passphraseFileFetcher invocation to succeed")

		assert.Equal(t, string(passphrase), string(pass), "Expected multiple passphrase fetch to return %q, got %q", passphrase, pass)
	}
}

func TestValidateVersion(t *testing.T) {
	type args struct {
		ver string
	}
	tests := []struct {
		name    string
		args    args
		wantErr error
	}{
		{
			"normal semver version",
			args{
				ver: "1.1.3-23658",
			},
			nil,
		},
		{
			"Pre version number starting with 0",
			args{
				ver: "1.1.3-023658",
			},
			semver.ErrSegmentStartsZero,
		},
		{
			"Invalid version number",
			args{
				ver: "1.1.3.sd.023658",
			},
			semver.ErrInvalidSemVer,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if err := validateVersion(tt.args.ver); err != nil {
				assert.ErrorIs(t, err, tt.wantErr)
			}
		})
	}
}

func TestRun_ErrorPath(t *testing.T) {
	client := NewPackage()
	_, err := client.Run("err-path", nil)
	require.Error(t, err)
}

func TestRun(t *testing.T) {
	chartPath := "testdata/charts/chart-with-schema"
	client := NewPackage()
	filename, err := client.Run(chartPath, nil)
	require.NoError(t, err)
	require.Equal(t, "empty-0.1.0.tgz", filename)
	require.NoError(t, os.Remove(filename))
}

// TestRunWithSourceDateEpochStampsLockGenerated verifies that packaging a chart
// that has a Chart.lock stamps both the tar entry modtime and the marshaled
// generated: field in Chart.lock to the given epoch.
//
// This guards against the normalization regression where a caller supplying a
// local-timezone or sub-second time.Time would produce a non-reproducible
// generated: value even when the same SOURCE_DATE_EPOCH is used on different
// machines.
func TestRunWithSourceDateEpochStampsLockGenerated(t *testing.T) {
	// Use a non-local, non-UTC timezone and sub-second precision to confirm
	// normalization: without UTC().Truncate(time.Second) the generated: field
	// would contain a timezone offset or fractional seconds.
	loc := time.FixedZone("UTC+3", 3*60*60)
	rawEpoch := time.Unix(1700000000, 123456789).In(loc)
	epoch := rawEpoch.UTC().Truncate(time.Second)

	client := NewPackage()
	client.SourceDateEpoch = &rawEpoch

	filename, err := client.Run("testdata/charts/chart-with-lock", nil)
	require.NoError(t, err)
	t.Cleanup(func() { os.Remove(filename) })

	f, err := os.Open(filename)
	require.NoError(t, err)
	defer f.Close()

	gr, err := gzip.NewReader(f)
	require.NoError(t, err)
	defer gr.Close()

	const wantPath = "chart-with-lock/Chart.lock"
	found := false
	tr := tar.NewReader(gr)
	for {
		hdr, err := tr.Next()
		if errors.Is(err, io.EOF) {
			break
		}
		require.NoError(t, err)
		if hdr.Name != wantPath {
			continue
		}
		found = true
		require.True(t, epoch.Equal(hdr.ModTime),
			"Chart.lock tar modtime: got %v, want %v", hdr.ModTime, epoch)

		raw, err := io.ReadAll(tr)
		require.NoError(t, err)
		wantGenerated := epoch.Format(time.RFC3339)
		require.Contains(t, string(raw), wantGenerated,
			"Chart.lock generated: field should contain normalized UTC timestamp")
		break
	}
	require.True(t, found, "expected archive to contain %q entry", wantPath)
}