module.exports = function aggregationValidator (mapconfig) {
    return function validateProperty (prop, validator) {
        for (let index = 0; index < mapconfig.getLayers().length; index++) {
            const aggregation = mapconfig.getAggregation(index);

            if (aggregation === undefined || aggregation[prop] === undefined) {
                continue;
            }

            validator(aggregation[prop], prop, index);
        }
    };
};

module.exports.createIncludesValueValidator = function (mapconfig, validValues) {
    return function validateIncludesValue (prop, key, index) {
        if (!validValues.includes(prop)) {
            const error = new Error(`Invalid ${key}. Valid values: ${validValues.join(', ')}`);
            error.type = 'layer';
            error.layer = {
                id: mapconfig.getLayerId(index),
                index: index,
                type: mapconfig.layerType(index)
            };

            throw error;
        }
    };
}

module.exports.createNumberValidator = function (mapconfig) {
    return function validateNumber (prop, key, index) {
        if (!Number.isFinite(prop) || prop <= 0)  {
            const error = new Error(`Invalid ${key}, should be a number greather than 0`);
            error.type = 'layer';
            error.layer = {
                id: mapconfig.getLayerId(index),
                index: index,
                type: mapconfig.layerType(index)
            };

            throw error;
        }
    };
}