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/*
 * Copyright 2014 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.way.code;

import java.util.Optional;

import com.squareup.javapoet.CodeBlock;
import com.squareup.javapoet.TypeName;

/**
 * @author [email protected] (Marcio Endo)
 */
public class Code {

  private Code() {
  }

  public static String lowerCaseFirstChar(String name) {
    return name.isEmpty() ? "" : name.substring(0, 1).toLowerCase() + name.substring(1);
  }

  public static CodeBlock nullCheck(String name) {
    return CodeBlock.builder()
        .beginControlFlow("if ($L == null)", name)
        .addStatement("throw new $T()", NullPointerException.class)
        .endControlFlow()
        .build();
  }

  public static Optional nullCheck(TypeName typeName, String name) {
    Optional res = Optional.empty();

    if (!typeName.isPrimitive()) {
      res = Optional.of(nullCheck(name));
    }

    return res;
  }

  public static String upperCaseFirstChar(String name) {
    return name.isEmpty() ? "" : name.substring(0, 1).toUpperCase() + name.substring(1);
  }

  public static String stripGenerics(String name) {
    String res = name;
    int hasGeneric = name.indexOf('<');
    if (hasGeneric > 0) {
      res = name.substring(0, hasGeneric);
    }
    return res;
  }

}