const _ = require("lodash");

const resolvePointer = require('./resolvePointer.cjs');

module.exports = (ajv) =>
    ajv.addKeyword({
        keyword: "sumOf",
        validate: function validate(
            { list, map },
            total,
            _parent,
            { rootData, instancePath }
        ) {
            if (list.$data) {
                list = resolvePointer(rootData, instancePath, list.$data);
            }

            if (map) list = _.map(list, map);

            if (_.sum(list) === total) return true;

            validate.errors = [
                {
                    keyword: "sumOf",
                    message: "should add up to sum total",
                    params: {
                        list,
                    },
                },
            ];

            return false;
        },
        $data: true,
        errors: true,
    });