"bytes"
	"flag"
	"strings"
	"testing"
)

func TestLevelString(t *testing.T) {
	for _, test := range []struct {
		in   Level
		want string
	}{
		{0, "INFO"},
		{LevelError, "ERROR"},
		{LevelError + 2, "ERROR+2"},
		{LevelError - 2, "WARN+2"},
		{LevelWarn, "WARN"},
		{LevelWarn - 1, "INFO+3"},
		{LevelInfo, "INFO"},
		{LevelInfo + 1, "INFO+1"},
		{LevelInfo - 3, "DEBUG+1"},
		{LevelDebug, "DEBUG"},

	}

	switch {
	case l < LevelInfo:
		return str("DEBUG", l-LevelDebug)
	case l < LevelWarn:
		return str("INFO", l-LevelInfo)
	case l < LevelError:
		return str("WARN", l-LevelWarn)
	default:
		return str("ERROR", l-LevelError)
	}
}

// MarshalJSON implements [encoding/json.Marshaler]
// by quoting the output of [Level.String].
func (l Level) MarshalJSON() ([]byte, error) {

// of the internal writer that uses the custom handler for log package after
// calling slog.SetDefault.
func ExampleSetLogLoggerLevel_slog() {
	// Set the default logging level to slog.LevelError.
	currentLogLevel := slog.SetLogLoggerLevel(slog.LevelError)
	defer slog.SetLogLoggerLevel(currentLogLevel) // revert changes after the example

	defer slog.SetDefault(slog.Default()) // revert changes after the example

	l.log(ctx, LevelWarn, msg, args...)
}

// Error logs at [LevelError].
func (l *Logger) Error(msg string, args ...any) {
	l.log(context.Background(), LevelError, msg, args...)
}

// ErrorContext logs at [LevelError] with the given context.
func (l *Logger) ErrorContext(ctx context.Context, msg string, args ...any) {
	l.log(ctx, LevelError, msg, args...)
}

		wantLevel Level
	}{
		{l.DebugContext, LevelDebug},
		{l.InfoContext, LevelInfo},
		{l.WarnContext, LevelWarn},
		{l.ErrorContext, LevelError},
		{DebugContext, LevelDebug},
		{InfoContext, LevelInfo},
		{WarnContext, LevelWarn},
		{ErrorContext, LevelError},
	} {
		h.clear()
		ctx := context.WithValue(context.Background(), "L", test.wantLevel)

		test.f(ctx, "msg")

		{"KindInt64", Const, 21},
		{"KindLogValuer", Const, 21},
		{"KindString", Const, 21},
		{"KindTime", Const, 21},
		{"KindUint64", Const, 21},
		{"Level", Type, 21},
		{"LevelDebug", Const, 21},
		{"LevelError", Const, 21},
		{"LevelInfo", Const, 21},
		{"LevelKey", Const, 21},
		{"LevelVar", Type, 21},
		{"LevelWarn", Const, 21},
		{"Leveler", Type, 21},
		{"Log", Func, 21},
		{"LogAttrs", Func, 21},