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/*
 * Copyright 2015 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.auto;

import java.util.List;

import javax.lang.model.element.Modifier;

import com.google.common.collect.ImmutableList;
import com.squareup.javapoet.ClassName;
import com.squareup.javapoet.CodeBlock;
import com.squareup.javapoet.FieldSpec;
import com.squareup.javapoet.MethodSpec;
import com.squareup.javapoet.ParameterSpec;
import com.squareup.javapoet.TypeSpec;

/**
 * @author [email protected] (Marcio Endo)
 */
abstract class IsPredicateStatic extends AbstractHasIsPredicate {

  IsPredicateStatic(IsPredicate predicate) {
    super(predicate);
  }

  public static IsPredicateStatic wrap(IsPredicate predicate) {
    List parameterSpecList = predicate.parameterSpecList;
    return parameterSpecList.isEmpty()
        ? new ParameterLess(predicate)
        : new WithParameter(predicate);
  }

  public abstract List fieldList();

  public abstract List methodList();

  void addFieldListTo(TypeSpec.Builder type) {
    List fieldList = fieldList();
    for (FieldSpec field : fieldList) {
      type.addField(field);
    }
  }

  void addMethodListTo(TypeSpec.Builder type) {
    List methodList = methodList();
    for (MethodSpec method : methodList) {
      type.addMethod(method);
    }
  }

  private static class ParameterLess extends IsPredicateStatic {

    public ParameterLess(IsPredicate predicate) {
      super(predicate);
    }

    @Override
    public List fieldList() {
      FieldSpec yes = field(className(), "INSTANCE");
      FieldSpec not = field(classNameNot(), "NOT");
      return ImmutableList.of(yes, not);
    }

    @Override
    public List methodList() {
      MethodSpec yes = method("get", "INSTANCE");
      MethodSpec not = method("not", "NOT");
      return ImmutableList.of(yes, not);
    }

    private FieldSpec field(ClassName className, String name) {
      return FieldSpec.builder(predicateTypeName(), name)
          .addModifiers(Modifier.PRIVATE, Modifier.STATIC, Modifier.FINAL)
          .initializer("new $T()", className)
          .build();
    }

    private MethodSpec method(String name, String fieldName) {
      return MethodSpec.methodBuilder(name)
          .addModifiers(Modifier.PUBLIC, Modifier.STATIC)
          .returns(predicateTypeName())
          .addStatement("return $L", fieldName)
          .build();
    }

  }

  private static class WithParameter extends IsPredicateStatic {

    public WithParameter(IsPredicate predicate) {
      super(predicate);
    }

    @Override
    public List fieldList() {
      return ImmutableList.of();
    }

    @Override
    public List methodList() {
      MethodSpec yes = method("get", className());
      MethodSpec not = method("not", classNameNot());
      return ImmutableList.of(yes, not);
    }

    private MethodSpec method(String name, ClassName className) {
      MethodSpec.Builder b = MethodSpec.methodBuilder(name)
          .addModifiers(Modifier.PUBLIC, Modifier.STATIC)
          .returns(predicateTypeName());

      for (ParameterSpec parameterSpec : parameterSpecList()) {
        b.addParameter(parameterSpec);
      }

      CodeBlock returnStatement = methodInfo().statementWriter()
          .add("return new $T(")
          .add("$L").forEachParameter(", ")
          .add(")")
          .set(className)
          .setParameterName()
          .write();

      return b.addCode(returnStatement)
          .build();
    }

  }

}