/**
 * @module Ontology
 */

/**
 * @todo Temporarily returns domains and ontology labels only
 * Traverse an ontology from its JSON description
 * @param {String} jsonPath The path (URI) of the ontology JSON file
 * @returns {Object}
 */
export async function traverseOntology(jsonPath) {
    const ontology = await loadOntology(jsonPath);
    const modules = ontology.modules;

    let tree = [];

    for (const module of modules) {
        if (module.id === 'Architecture') {
            console.debug(module.classTrees);
            for (const classTree of module.classTrees) {
                traverseClasses(classTree, tree);
            }
        }
    }

    return {
        ontology: "Architecture",
        domains: tree
    };
}

/**
 * 
 * @param {Object} ontologyClass 
 * @param {Array<Object>} tree 
 * @param {Number} depth
 */
function traverseClasses(ontologyClass, tree, depth = 1) {
    const ontologyNode = {
        id: ontologyClass.id,
        label: ontologyClass.label,
        depth,
        children: [],
    };

    tree.push(ontologyNode);

    if (ontologyClass.children && Array.isArray(ontologyClass.children)) {
        for(const child of ontologyClass.children) {
            ontologyNode.children.push(
                traverseClasses(child, tree, depth + 1)
            );
        }
    }

}

/**
 * Load an ontology from its JSON description
 * @param {String} jsonPath The path (URI) of the ontology JSON file
 * @returns {Object}
 */
export async function loadOntology(jsonPath) {
    const ontology = await fetch(jsonPath)
        .then(res => res.json())
        .catch(err => console.error(err));

    return ontology;
}