generateQuery.js

const printName = name => {
  return " " + name;
};

const handleNested = (fieldsPath, fieldType) => {
  const fields = recursiveQuery(fieldsPath);
  return fields ? ` ${fieldType} { ${fields} }` : "";
};

const _query = property => {
  // Special cases (nested values)
  if (property.name === "allOf") {
    if (property.type.ofType) {
      return handleNested(property.type.ofType.fields, "allOf");
    }

    return handleNested(property.type.fields, "allOf");
  }

  if (property.name === "oneOf") {
    if (property.type.ofType) {
      return handleNested(property.type.ofType.fields, "oneOf");
    }
    return handleNested(property.type.fields, "oneOf");
  }

  // Base cases
  if (!property.type) {
    return printName(property.name);
  }

  if (property.type && !property.type.fields) {
    // Base case
    return printName(property.name);
  }

  // Normal recursion
  if (property.type && property.type.fields) {
    return `${printName(property.name)} { ${recursiveQuery(
      property.type.fields
    )} }`;
  }

  if (property.type && property.type.typeOf && property.type.typeOf.fields) {
    return `${printName(property.name)} { ${recursiveQuery(
      property.type.typeOf.fields
    )} }`;
  }

  // If we reach this point, there's a problem.
  throw new Error("No cases matched.");
};

const recursiveQuery = properties => {
  if (properties === null) {
    return;
  }
  return properties.map(property => _query(property));
};

module.exports = { recursiveQuery };