import React, {useState} from 'react';
// import cytoscape from 'cytoscape';
// import cola from 'cytoscape-cola';
import {useRouter} from 'next/router'

import CytoscapeComponent from "react-cytoscapejs";


const layout = {
    name: 'circle',
    fit: true, // whether to fit the viewport to the graph
    padding: 32, // the padding on fit
    boundingBox: undefined, // constrain layout bounds; { x1, y1, x2, y2 } or { x1, y1, w, h }
    avoidOverlap: true, // prevents node overlap, may overflow boundingBox and radius if not enough space
    nodeDimensionsIncludeLabels: false, // Excludes the label when calculating node bounding boxes for the layout algorithm
    spacingFactor: 0.9, // Applies a multiplicative factor (>0) to expand or compress the overall area that the nodes take up
    radius: 150, // the radius of the circle
    startAngle: -2 / 4 * Math.PI, // where nodes start in radians
    //sweep: undefined, // how many radians should be between the first and last node (defaults to full circle)
    clockwise: true, // whether the layout should go clockwise (true) or counterclockwise/anticlockwise (false)
    sort: undefined, // a sorting function to order the nodes; e.g. function(a, b){ return a.data('weight') - b.data('weight') }
    animate: false, // whether to transition the node positions
    animationDuration: 500, // duration of animation in ms if enabled
    animationEasing: undefined, // easing of animation if enabled
    //animateFilter: function ( node, i ){ return true; }, // a function that determines whether the node should be animated.  All nodes animated by default on animate enabled.  Non-animated nodes are positioned immediately when the layout starts
    ready: undefined, // callback on layoutready
    stop: undefined, // callback on layoutstop
    transform: function (node, position) {
        return position;
    } // transform a given node position. Useful for changing flow direction in discrete layouts
};

const styleSheet = [{
    selector: "node",
    style: {
        "background-color": "#666",
        "font-size": "10px",
        "width": "20px",
        "height": "20px",
        "label":"data(label)"
    }
}, {
    selector: "label",
    style: {"font-size": "12px"},
},
    {
        selector: 'edge',
        style: {
            'width': 2,
            "height": 200,
            'line-color': '#9a9a9a',
            'target-arrow-color': '#ccc',
            // 'target-arrow-shape': 'triangle',
            'curve-style': 'straight'
        }
    }];

function Graph({graph}) {

    const [width, setWith] = useState("400px");
    const [height, setHeight] = useState("400px");
    const [graphData, setGraphData] = useState({
        nodes: graph.nodes,
        edges: graph.edges
    });

    let myCyRef;
    const router = useRouter()
    return (
        <>
            <div>
                <h3>Links to this notes</h3>
                <div
                    style={{
                        border: "1px solid",
                        backgroundColor: "#f5f6fe"
                    }}
                >
                    <CytoscapeComponent
                        elements={CytoscapeComponent.normalizeElements(graphData)}
                        // pan={{ x: 200, y: 200 }}
                        style={{width: width, height: height}}
                        zoomingEnabled={true}
                        maxZoom={2}
                        minZoom={0.5}
                        autounselectify={false}
                        boxSelectionEnabled={true}
                        layout={layout}
                        stylesheet={styleSheet}
                        cy={cy => {
                            myCyRef = cy;

                            console.log("EVT", cy);

                            cy.on("tap", "node", evt => {
                                var node = evt.target;
                                let nodeData = node.data();
                                if (typeof nodeData.id === 'string') {
                                    const path = '/note/' + node.data().id
                                    router.push(path)
                                }
                            });
                        }}
                    />
                </div>
            </div>
        </>
    );
}

export default Graph;