package cli //nolint:testpackage // shares runEntry and the hermetic config helpers

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

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

// flagCron is used to build the argument vectors below.
const flagCron = "--cron"

// plantUnreferencedBlob writes a blob that no snapshot references to the
// destination store at storeDir, so that a prune deletes it. Returns its
// path.
func plantUnreferencedBlob(t *testing.T, storeDir string) string {
	t.Helper()

	hash := strings.Repeat("b", 64)
	path := filepath.Join(storeDir, "blobs", hash[:2], hash[2:4], hash)

	require.NoError(t, os.MkdirAll(filepath.Dir(path), 0o750))
	require.NoError(t, os.WriteFile(path, []byte("unreferenced"), 0o600))

	return path
}

// TestEntrySnapshotCreatePruneIsSilent checks that a successful
// `snapshot create --prune` under --cron or --quiet prints nothing on
// stdout or stderr, whether or not the prune finds a blob to delete.
//
//nolint:paralleltest // replaces os.Args, os.Stdout, os.Stderr and the xdg globals
func TestEntrySnapshotCreatePruneIsSilent(t *testing.T) {
	for _, testCase := range []struct {
		name      string
		args      []string
		plantBlob bool
	}{
		{
			name: "cron, no blob to delete",
			args: []string{cmdSnapshot, cmdCreate, flagCron, flagPrune},
		},
		{
			name:      "cron, blob to delete",
			args:      []string{cmdSnapshot, cmdCreate, flagCron, flagPrune},
			plantBlob: true,
		},
		{
			name: "cron with keep-newer-than",
			args: []string{
				cmdSnapshot, cmdCreate, flagCron, flagPrune,
				flagKeepNewerThan, "4w",
			},
			plantBlob: true,
		},
		{
			name:      "quiet",
			args:      []string{flagQuiet, cmdSnapshot, cmdCreate, flagPrune},
			plantBlob: true,
		},
	} {
		t.Run(testCase.name, func(t *testing.T) {
			configPath, storeDir := writeBackupConfig(t)

			var blob string
			if testCase.plantBlob {
				blob = plantUnreferencedBlob(t, storeDir)
			}

			code, stdout, stderr := runEntry(t,
				append([]string{flagConfig, configPath}, testCase.args...)...)

			assert.Equal(t, 0, code)
			assert.Empty(t, stdout)
			assert.Empty(t, stderr)

			if testCase.plantBlob {
				assert.NoFileExists(t, blob, "the prune must delete the blob")
			}
		})
	}
}

// TestEntryPruneQuietIsSilent checks that a successful `prune --force`
// under --quiet prints nothing on stdout or stderr, both when there is
// nothing to remove and when it removes a stale local snapshot record
// and an unreferenced blob.
//
//nolint:paralleltest // replaces os.Args, os.Stdout, os.Stderr and the xdg globals
func TestEntryPruneQuietIsSilent(t *testing.T) {
	for _, testCase := range []struct {
		name               string
		staleRecordAndBlob bool
	}{
		{name: "nothing to remove"},
		{name: "stale record and blob to remove", staleRecordAndBlob: true},
	} {
		t.Run(testCase.name, func(t *testing.T) {
			configPath := writeHermeticPruneConfig(t, testCase.staleRecordAndBlob)

			var blob string
			if testCase.staleRecordAndBlob {
				// writeHermeticPruneConfig puts the store beside the config.
				blob = plantUnreferencedBlob(t,
					filepath.Join(filepath.Dir(configPath), "store"))
			}

			code, stdout, stderr := runEntry(t,
				flagConfig, configPath, flagQuiet, cmdPrune, flagForce)

			assert.Equal(t, 0, code)
			assert.Empty(t, stdout)
			assert.Empty(t, stderr)

			if testCase.staleRecordAndBlob {
				assert.NoFileExists(t, blob, "the prune must delete the blob")
			}
		})
	}
}