package cli //nolint:testpackage // shares hermeticConfig and the capture helpers

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

	"github.com/adrg/xdg"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"sneak.berlin/go/vaultik/internal/database"
)

// TestEntryCompletionStdoutIsTheScript runs `vaultik completion bash`,
// whose stdout the README tells the user to source. The script has to
// start on the first line.
//
//nolint:paralleltest // replaces os.Args, os.Stdout and os.Stderr
func TestEntryCompletionStdoutIsTheScript(t *testing.T) {
	code, stdout, _ := runEntry(t, "completion", "bash")

	require.Equal(t, 0, code)

	firstLine, _, _ := strings.Cut(stdout, "\n")
	assert.True(t, strings.HasPrefix(firstLine, "# bash completion"),
		"the first line of stdout must be the script's, got %q", firstLine)
}

// TestEntryConfigGetStdoutIsTheValue runs `vaultik config get`, whose
// stdout a script reads as the value and nothing else.
//
//nolint:paralleltest // replaces os.Args, os.Stdout and os.Stderr
func TestEntryConfigGetStdoutIsTheValue(t *testing.T) {
	configPath := filepath.Join(t.TempDir(), "config.yml")
	require.NoError(t, os.WriteFile(configPath,
		[]byte("hostname: test-host\n"), configFileMode))

	code, stdout, _ := runEntry(t,
		flagConfig, configPath, "config", "get", "hostname")

	require.Equal(t, 0, code)
	assert.Equal(t, "test-host\n", stdout)
}

// TestEntryJSONFailureIsReportedOnStderr runs each --json command that
// writes no document when it fails, against a destination it cannot
// use. The error must reach stderr, and stdout must stay empty.
//
//nolint:paralleltest // replaces os.Args, os.Stdout, os.Stderr and the xdg globals
func TestEntryJSONFailureIsReportedOnStderr(t *testing.T) {
	for _, testCase := range []struct {
		name         string
		args         []string
		wantOnStderr string
	}{
		{
			name:         "remote info",
			args:         []string{cmdRemote, cmdInfo, flagJSON},
			wantOnStderr: "Failed to get remote info",
		},
		{
			name:         "prune",
			args:         []string{cmdPrune, flagJSON},
			wantOnStderr: "Prune failed",
		},
		{
			name:         "snapshot remove",
			args:         []string{cmdSnapshot, cmdRemove, someSnapshotID, flagJSON},
			wantOnStderr: "Failed to remove snapshot",
		},
	} {
		t.Run(testCase.name, func(t *testing.T) {
			configPath := writeUnusableDestinationConfig(t)

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

			assert.Equal(t, 1, code)
			assert.Empty(t, stdout,
				"a failed --json command has no document to write")
			assert.Contains(t, stderr, testCase.wantOnStderr,
				"the failure must be reported on stderr")
		})
	}
}

// TestEntrySnapshotRemoveJSONWarningIsOnStderr runs `snapshot remove
// --json` on a snapshot in the local index, against a destination
// directory that does not exist. The command removes the snapshot from
// the local index and still exits 0. Its stdout must hold the document
// alone, with the warning about the destination store, and the command
// to run again once it is reachable, on stderr.
//
//nolint:paralleltest // replaces os.Args, os.Stdout, os.Stderr and the xdg globals
func TestEntrySnapshotRemoveJSONWarningIsOnStderr(t *testing.T) {
	configPath, indexPath := writeMissingDestinationConfig(t)
	seedStaleSnapshotRecord(t, indexPath)

	code, stdout, stderr := runEntry(t, flagConfig, configPath,
		cmdSnapshot, cmdRemove, stalePruneSnapshotID, flagJSON)

	require.Equal(t, 0, code)
	requireExactlyOneJSONDocument(t, stdout)
	assert.Contains(t, stderr,
		"Could not remove snapshot metadata from remote storage")
	assert.Contains(t, stderr,
		"run 'vaultik snapshot remove "+stalePruneSnapshotID+"' again")
}

// writeMissingDestinationConfig builds a config whose destination
// directory does not exist. Returns the config path and the path of
// its local index, which is not created here.
func writeMissingDestinationConfig(t *testing.T) (string, string) {
	t.Helper()

	dir := t.TempDir()
	configPath := filepath.Join(dir, "config.yml")
	indexPath := filepath.Join(dir, "index.sqlite")

	contents := fmt.Sprintf(hermeticConfig,
		filepath.Join(dir, "source"),
		filepath.Join(dir, "missing-store"),
		indexPath)

	require.NoError(t,
		os.WriteFile(configPath, []byte(contents), configFileMode))

	// The PID lock lives under xdg.DataHome, which xdg resolves at
	// package init; point it at the temp dir so the test neither
	// touches nor collides with the real one.
	t.Setenv("XDG_DATA_HOME", filepath.Join(dir, "data"))
	xdg.Reload()
	t.Cleanup(xdg.Reload)

	return configPath, indexPath
}

// writeUnusableDestinationConfig builds a config whose destination
// directory does not exist, which fails `remote info`, and whose local
// index is bound to another destination, which fails `prune` and
// `snapshot remove` (a missing destination alone only makes `snapshot
// remove` warn). Returns the config path.
func writeUnusableDestinationConfig(t *testing.T) string {
	t.Helper()

	configPath, indexPath := writeMissingDestinationConfig(t)

	ctx := context.Background()

	db, err := database.New(ctx, indexPath)
	require.NoError(t, err)

	defer func() { require.NoError(t, db.Close()) }()

	require.NoError(t, database.NewRepositories(db).LocalMeta.Set(ctx,
		database.LocalMetaKeyStorageURL, "file://"+t.TempDir()))

	return configPath
}

// runEntry runs Entry with args after the program name and returns its
// exit code and what it wrote to stdout and stderr.
//
// Not parallel-safe: it replaces os.Args, os.Stdout and os.Stderr.
func runEntry(t *testing.T, args ...string) (int, string, string) {
	t.Helper()

	previousArgs := os.Args

	t.Cleanup(func() {
		os.Args = previousArgs
		rootFlags = RootFlags{}
	})

	os.Args = append([]string{programName}, args...)

	var code int

	stdout, stderr := captureProcessStdoutAndStderr(t,
		func() { code = Entry() })

	return code, stdout, stderr
}