/*!
 * Copyright (c) 2023, 2024, Oracle and/or its affiliates.
 */

/**
 * @file
 * 
 * Contains router settings and calculations.
 * 
 * Routers determine the path links take from point A to point B.
 * 
 * Router names are defined in the DiagramBuilderRouter and exposed under
 * DiagramBuilder.Router to the user.
 */

import DiagramBuilderRouter from "../DiagramBuilderRouter.mjs";
import { getAnchorCoords } from "./graph.mjs";

const { routers } = joint;

export function getRouterConfig( name, args ) {
    const R = DiagramBuilderRouter;

    switch ( name ) {
        case R.MANHATTAN: // fall-thru
        case R.ADVANCED_MANHATTAN: // fall-thru
        case R.ORTHOGONAL:
            return {
                name,
                args: {
                    padding: 20,
                    ...args
                }
            };
        default:
            return { name };
    }
}

export function defineCustomRouters() {

    routers[DiagramBuilderRouter.ADVANCED_MANHATTAN] = function( vertices, args, linkView ) {
        const { model } = linkView;
        const sourceElement = model.getSourceElement();
        const targetElement = model.getTargetElement();

        if ( sourceElement ) {
            const sourceElBbox = sourceElement.getBBox();
            const sourceAnchorCoords = getAnchorCoords( model.source().anchor, sourceElBbox );
            args.startDirections = [sourceElBbox.sideNearestToPoint( sourceAnchorCoords )];
        }
        else {
            delete args.startDirections;
        }

        if ( targetElement ) {
            const targetElBbox = targetElement.getBBox();
            const targetAnchorCoords = getAnchorCoords( model.target().anchor, targetElBbox );
            args.endDirections = [targetElBbox.sideNearestToPoint( targetAnchorCoords )];
        }
        else {
            delete args.endDirections;
        }

        return routers.manhattan( vertices, args, linkView );
    };

    routers[DiagramBuilderRouter.ADVANCED_RIGHT_ANGLE] = function( vertices, args, linkView ) {
        args.useVertices = true;
        return routers.rightAngle( vertices, args, linkView );
    };
}