@Nullable
  private static PsiExpression extractConditionalDefaultValue(@NotNull PsiStatement statement, @NotNull PsiVariable optValue) {
    if (statement instanceof PsiIfStatement ifStatement) {
      PsiExpression condition = ifStatement.getCondition();
      if (condition == null) return null;
      PsiExpression thenExpr = getReturnExpression(ifStatement.getThenBranch());
      PsiExpression elseExpr = getReturnExpression(ifStatement.getElseBranch());
      if (thenExpr == null || elseExpr == null) return null;
      return extractConditionalDefaultValue(thenExpr, elseExpr, condition, optValue);
    }
    else if (statement instanceof PsiReturnStatement returnStatement) {
      PsiExpression returnValue = returnStatement.getReturnValue();
      PsiConditionalExpression ternary = tryCast(PsiUtil.skipParenthesizedExprDown(returnValue), PsiConditionalExpression.class);
      if (ternary == null) return null;
      PsiExpression thenExpression = ternary.getThenExpression();
      PsiExpression elseExpression = ternary.getElseExpression();
      if (thenExpression == null || elseExpression == null) return null;
      return extractConditionalDefaultValue(thenExpression, elseExpression, ternary.getCondition(), optValue);
    }
    return null;
  }
@Nullable
  private static PsiExpression extractConditionalDefaultValue(@NotNull PsiStatement statement, @NotNull PsiVariable optValue)