'use strict';

const { makeExtendSchemaPlugin, gql } = require('graphile-utils');
const moment = require('moment');
const { cmToFeetInches, kgToLbs } = require('../../utils/convert');

const schemaExtender = makeExtendSchemaPlugin(_build => ({
	typeDefs: gql`
        enum Units {
            METRIC
            IMPERIAL
        }

      extend type Actor {
        age: Int @requires(columns: ["dateOfBirth"])
        ageAtDeath: Int @requires(columns: ["dateOfBirth", "dateOfDeath"])
        height(units:Units): String @requires(columns: ["height"])
        weight(units:Units): String @requires(columns: ["weight"])
      }
    `,
	resolvers: {
		Actor: {
			age(parent, _args, _context, _info) {
				if (!parent.dateOfBirth) return null;

				return moment().diff(parent.dateOfBirth, 'years');
			},
			ageAtDeath(parent, _args, _context, _info) {
				if (!parent.dateOfDeath) return null;

				return moment(parent.dateOfDeath).diff(parent.dateOfBirth, 'years');
			},
			height(parent, args, _context, _info) {
				if (!parent.height) return null;

				if (args.units === 'IMPERIAL') {
					const { feet, inches } = cmToFeetInches(parent.height);
					return `${feet}' ${inches}"`;
				}

				return parent.height.toString();
			},
			weight(parent, args, _context, _info) {
				if (!parent.weight) return null;

				return args.units === 'IMPERIAL'
					? kgToLbs(parent.weight).toString()
					: parent.weight.toString();
			},
		},
	},
}));

module.exports = [schemaExtender];