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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 java.util.stream.Collectors;

import br.com.objectos.code.MethodInfo;
import br.com.objectos.code.ParameterInfo;
import br.com.objectos.code.SimpleTypeInfo;
import br.com.objectos.code.TypeInfo;

import com.google.common.base.Function;
import com.squareup.javapoet.ClassName;
import com.squareup.javapoet.JavaFile;
import com.squareup.javapoet.ParameterSpec;
import com.squareup.javapoet.ParameterizedTypeName;
import com.squareup.javapoet.TypeName;
import com.squareup.javapoet.TypeSpec;

/**
 * @author [email protected] (Patricia Nascimento)
 */
class ToFunction {

  final TypeInfo typeInfo;
  final MethodInfo methodInfo;
  final List parameterSpecList;
  final ClassName className;
  final TypeName functionTypeName;

  private ToFunction(TypeInfo typeInfo,
                     MethodInfo methodInfo,
                     List parameterSpecList,
                     ClassName className,
                     TypeName functionTypeName) {
    this.typeInfo = typeInfo;
    this.methodInfo = methodInfo;
    this.parameterSpecList = parameterSpecList;
    this.className = className;
    this.functionTypeName = functionTypeName;
  }

  public static ToFunction wrap(TypeInfo typeInfo, MethodInfo methodInfo) {
    List parameterSpecList = methodInfo.parameterInfoStream()
        .map(ParameterInfo::parameterSpec)
        .collect(Collectors.toList());

    String suffix = methodInfo.className();
    ClassName className = typeInfo.classNameSuffix(suffix);

    ClassName function = ClassName.get(Function.class);
    TypeName from = typeInfo.typeNameRaw();
    SimpleTypeInfo returnTypeInfo = methodInfo.returnTypeInfo().autobox();
    TypeName to = returnTypeInfo.typeName();
    TypeName functionTypeName = ParameterizedTypeName.get(function, from, to);

    return new ToFunction(typeInfo, methodInfo, parameterSpecList, className, functionTypeName);
  }

  public JavaFile get() {
    ToFunctionType type = type();
    TypeSpec typeSpec = type.get();
    return typeInfo.toJavaFile(typeSpec);
  }

  ToFunctionConstructor constructor() {
    return new ToFunctionConstructor(this);
  }

  ToFunctionField field() {
    return new ToFunctionField(this);
  }

  ToFunctionMethod method() {
    return new ToFunctionMethod(this);
  }

  ToFunctionStatic static_() {
    return ToFunctionStatic.wrap(this);
  }

  ToFunctionType type() {
    return new ToFunctionType(this);
  }

}