import { Graph } from '../../Graph';
import { StaticLayout } from './StaticLayout';

class CircleLayout extends StaticLayout {

    _cx: number;
    _cy: number;
    _radius: number;
    
    constructor () {

        super();
        
        this._cx = 0;
        this._cy = 0;
        this._radius = 250;

    }

    apply (graph: Graph): void {

        const bbox = graph.boundingBox();
        const cx = (bbox[1] + bbox[3]) / 2;
        const cy = (bbox[0] + bbox[2]) / 2;
        const w = Math.abs(bbox[1] - bbox[3]);
        const h = Math.abs(bbox[0] - bbox[2]);
        const r = 0.8 * Math.min(w, h) / 2;

        const nodes = graph.nodes();
        const a = 2 * Math.PI / nodes.length;

        nodes.forEach((node, index) => {
            node.x = cx + r * Math.cos(index * a);
            node.y = cy + r * Math.sin(index * a);
        });


    }
    
    cx (): number;
    cx (cx: number): this;
    cx (cx?: number): number | this {
        return arguments.length
            ? (this._cx = cx!, this)
            : this._cx;
    }

    cy (): number;
    cy (cy: number): this;
    cy (cy?: number): number | this {
        return arguments.length
            ? (this._cy = cy!, this)
            : this._cy;
    }

    radius (): number;
    radius (radius: number): this;
    radius (radius?: number): number | this {
        return arguments.length
            ? (this._radius = radius!, this)
            : this._radius;
    }

}

export {
    CircleLayout
}