Opetushallitus/eperusteet-opintopolku

/*
 * Copyright (c) 2013 The Finnish Board of Education - Opetushallitus
 *
 * This program is free software: Licensed under the EUPL, Version 1.1 or - as
 * soon as they will be approved by the European Commission - subsequent versions
 * of the EUPL (the "Licence");
 *
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at: http://ec.europa.eu/idabc/eupl
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * European Union Public Licence for more details.
 */

angular.module("app").service("TermistoService", function(PerusteTermistoCRUD, OpsTermistoCRUD, $q, $timeout) {
    //resource is either the peruste or the ops
    var resources = [],
        cached = {};
    cached["number"] = 0;
    let loading = false;
    const cacheKasitteet = items => {
        _.each(items, item => {
            cached[item.avain] = item;
        });
        cached["number"]++;
    };
    const CRUD = {
        OPS: OpsTermistoCRUD.query,
        PERUSTE: PerusteTermistoCRUD.query
    };
    const mapResources = resrcs => {
        return _.map(resrcs, (resource: any) => {
            if (resource.type === "OPS") {
                CRUD.PERUSTE({ resourceId: resource.perusteenId }).$promise.then(res => cacheKasitteet(res));
            }
            CRUD[resource.type]({ resourceId: resource.id }).$promise.then(res => cacheKasitteet(res));
        });
    };
    this.preload = function() {
        if (resources.length != cached["number"] && !loading) {
            loading = true;
            var self = this;
            $timeout(function() {
                self.getAll().then(function() {
                    loading = false;
                });
            });
        }
    };
    this.getAll = function() {
        return $q.all(mapResources(resources));
    };

    this.setResource = (value, type = "PERUSTE") => {
        value.type = type.toUpperCase();
        resources.push(value);
    };

    function findTermi(avain) {
        return cached[avain];
    }

    this.getWithAvain = function(avain, cached) {
        if (cached) {
            return findTermi(avain);
        } else {
            var deferred = $q.defer();
            this.getAll().then(function() {
                deferred.resolve(findTermi(avain));
            });
        }
        return deferred.promise;
    };
});