export default class MySerializer {
  static create() {
    return new this();
  }
  
  normalizeResponse(_, __, rawData) {
    if (rawData.data) {
      return rawData;
    }
    const data = normalizePerson(rawData.person);
    const included = [];
    
    if (rawData.person.father) {
      included.push(normalizePerson(rawData.person.father));
    }
    if (rawData.person.friends) {
      rawData.person.friends.forEach(f => {
        included.push(normalizePerson(f));
      });
    }
    
    return { data, included };
  }
}

function normalizePerson(person) {
  const data = {
      type: 'person',
      id: `${person.id}`,
      attributes: {
        name: person.name,
        age: person.age
      },
      relationships: {}
    };
  if (person.friends) {
    data.relationships.friends = {
      data: person.friends.map(r => { return { type: 'person', id: `${r.id}` }; })
    };
  }
  if (person.father) {
    data.relationships.father = { data: { type: 'person', id: `${person.father.id}` } }
  }
  
  return data;
}