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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.xls.pojo.plugin;

import java.util.List;
import java.util.Optional;

import br.com.objectos.code.SimpleTypeInfo;
import br.com.objectos.code.TypeInfo;
import br.com.objectos.code.TypeParameterInfo;
import br.com.objectos.pojo.plugin.Contribution.Builder;
import br.com.objectos.pojo.plugin.Property;
import br.com.objectos.xls.pojo.Row;

import com.squareup.javapoet.MethodSpec;

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

  private final String fieldName;
  private final SheetType sheetType;

  private SpreadsheetMethod(String fieldName, SheetType sheetType) {
    this.fieldName = fieldName;
    this.sheetType = sheetType;
  }

  public static Optional of(Property property) {
    SimpleTypeInfo returnTypeInfo = property.returnTypeInfo();
    if (!returnTypeInfo.isSubType(List.class)) {
      property.compilationError("Only List<> methods are currently supported.");
      return Optional.empty();
    }

    TypeInfo typeInfo = returnTypeInfo.getTypeParameterInfoStream()
        .findFirst()
        .flatMap(TypeParameterInfo::typeInfo)
        .get();

    if (!typeInfo.hasInterface(Row.class)) {
      property.compilationError("%s must implement Row.", typeInfo.simpleName());
      return Optional.empty();
    }

    SheetType sheetType = SheetType.of(typeInfo);
    SpreadsheetMethod method = new SpreadsheetMethod(property.name(), sheetType);
    return Optional.of(method);
  }

  public void addTo(Builder builder) {
    builder.addMethod(sheetType.write(fieldName));
  }

  public void newSpreadsheetStatement(MethodSpec.Builder newSpreadsheet) {
    sheetType.newSpreadsheetStatement(newSpreadsheet, fieldName);
  }

}