const jsonQuery = require('json-query');    //https://github.com/auditassistant/json-query
const merge = require('merge-deep');  //https://github.com/jonschlinkert/merge-deep

export default class Converter {

    //This function is similar to getEdgeGraph
    //Purpose: convert the edge graph (v1) to Ed's specification (v2)
    //V1 with edgeName as the key, V2 with the source node as key
    convertToEdEdgesGraph = (uniqueEdgeNames: Array<any>, edgesJson) => {

        let source;
        let uniqueSources = [];

        let edges = {};
        let combinedEdges = {};
        let edgeJson = {edges: {}};
        for (let uniqueEdgeName of uniqueEdgeNames) {
            let links = edgesJson['edges'][uniqueEdgeName];
            //console.log(links);
            for (let link of links) {
                source = link['source'];
                //console.log(source);
                if (!uniqueSources.includes(source))
                    uniqueSources.push(source);
            }
        }

        //console.log("uniqueSources: " + uniqueSources);
        for (let uniqueEdgeName of uniqueEdgeNames) {
            let links = [];
            for (let uniqueSource of uniqueSources) {
                let result = jsonQuery(`${uniqueEdgeName}[**][*source=${uniqueSource}]`,
                    {data: edgesJson['edges']}
                )

                links = result.value;
                if (links.length > 0) {
                    edges[uniqueSource] = links;
                }
            }
            //console.log(edges);
            //using deep merge for merging source nodes from different databases under one key
            combinedEdges = merge(combinedEdges, edges);
            edges = {};
        }

        edgesJson.edges = combinedEdges;
        return edgesJson;
    }

}