/**
 * Elastic search query builder service
 */
angular.module('superdesk.core.elastic').service('es', [function() {
    var SIZE_DEFAULT = 25;

    /**
     * Set from/size for given query and params
     *
     * @param {Object} query
     * @param {Object} params
     * @returns {Object}
     */
    function paginate(query, params) {
        var page = params.page || 1;

        query.size = params.size || SIZE_DEFAULT;
        query.from = (page - 1) * query.size;
        return query;
    }

    /**
     * Build query using elastic query dsl
     *
     * @param {Object} params
     * @param {Array} filters
     * @returns {Object}
     */
    function buildQuery(params, filters) {
        var query: any = {filtered: {}};

        if (filters && filters.length) {
            query.filtered.filter = {and: filters};
        }

        if (params.q) {
            query.filtered.query = {query_string: {query: params.q}};
        }

        return paginate({query: query}, params);
    }

    return buildQuery;
}]);