SV.registerLayout('AdjoinTableGraph', {

    sourcesPreprocess(sources, options) {
        let dataLength = sources.length;
        let tableHeadNodes = [];
        let nodeMap = {};
        let i;
        

        for (i = 0; i < dataLength; i++) {
            let graphNode = sources[i];

            tableHeadNodes.push({
                id: `table-head-node-${i}`,
                type: 'tableHeadNode',
                data: graphNode.id
            });

            nodeMap[graphNode.id] = {
                node: graphNode,
                order: i,
                neighbor: []
            };
        }

        Object.keys(nodeMap).map(key => {
            let nodeData = nodeMap[key],
                neighbor = nodeData.node.neighbor;

            if (neighbor === undefined) {
                return;
            }

            neighbor.forEach((item, index) => {
                let targetNodeData = nodeMap[item];

                nodeData.neighbor.push({
                    id: `${key}-table-node-${item}`,
                    type: 'tableNode',
                    data: item.toString(),
                    order: targetNodeData.order
                });

                targetNodeData.neighbor.push({
                    id: `${item}-table-node-${key}`,
                    type: 'tableNode',
                    data: key.toString(),
                    order: nodeData.order
                });
            });

            Object.keys(nodeMap).map(key => {
                let nodeData = nodeMap[key],
                    neighbor = nodeData.neighbor;

                if (neighbor === undefined) {
                    return;
                }

                neighbor.sort((n1, n2) => {
                    return n1.order - n2.order;
                });

                for(let i = 0; i < neighbor.length; i++) {
                    if(neighbor[i + 1]) {
                        neighbor[i].next = `tableNode#${neighbor[i + 1].id}`;
                    }
                }
            });

            tableHeadNodes.forEach(item => {
                let nodeData = nodeMap[item.data],
                    neighbor = nodeData.neighbor;

                if(neighbor.length) {
                    item.headNext = `tableNode#${neighbor[0].id}`;
                }
            });
        });

        sources.push(...tableHeadNodes);
        Object.keys(nodeMap).map(key => {
            let nodeData = nodeMap[key],
                neighbor = nodeData.neighbor;
            
            sources.push(...neighbor);
        });

        return sources;
    },

    defineOptions() {
        return {
            element: {
                default: {
                    type: 'circle',
                    label: '[id]',
                    size: 40,
                    style: {
                        stroke: '#333',
                        fill: '#95e1d3'
                    }
                },
                tableHeadNode: {
                    type: 'two-cell-node',
                    label: '[data]',
                    size: [70, 40],
                    style: {
                        stroke: '#333',
                        fill: '#95e1d3'
                    }
                },
                tableNode: {
                    type: 'link-list-node',
                    label: '[data]',
                    size: [60, 30],
                    style: {
                        stroke: '#333',
                        fill: '#95e1d3'
                    }
                }
            },
            link: {
                neighbor: {
                    style: {
                        stroke: '#333'
                    }
                },
                headNext: { 
                    sourceAnchor: 1,
                    targetAnchor: 6,
                    style: {
                        stroke: '#333',
                        endArrow: {
                            path: G6.Arrow.triangle(8, 6, 0), 
                            fill: '#333'
                        },
                        startArrow: {
                            path: G6.Arrow.circle(2, -1), 
                            fill: '#333'
                        }
                    }
                },
                next: {
                    sourceAnchor: 2,
                    targetAnchor: 6,
                    style: {
                        stroke: '#333',
                        endArrow: {
                            path: G6.Arrow.triangle(8, 6, 0), 
                            fill: '#333'
                        },
                        startArrow: {
                            path: G6.Arrow.circle(2, -1), 
                            fill: '#333'
                        }
                    }
                }
            },
            layout: {
                radius: 150,
                interval: 250,
                xInterval: 50,
                yInterval: 50
            },
            behavior: {
                dragNode: ['default', 'tableNode']
            }
        };
    },

    /**
     * 对子树进行递归布局
     * @param node 
     * @param parent 
     */
     layoutItem(node, prev, layoutOptions) {
        if(!node) {
            return null;
        }

        let width = node.get('size')[0];

        if(prev) {
            node.set('y', prev.get('y'));
            node.set('x', prev.get('x') + layoutOptions.xInterval + width);
        }

        if(node.next) {
            this.layoutItem(node.next, node, layoutOptions);
        }
    },  

    layout(elements, layoutOptions) {
        let nodes = elements.filter(item => item.type === 'default'),
            tableHeadNode = elements.filter(item => item.type === 'tableHeadNode'),
            nodeLength = nodes.length,
            { radius } = layoutOptions,
            intervalAngle = 2 * Math.PI / nodes.length,
            i;

        for (i = 0; i < nodeLength; i++) {
            let [x, y] = Vector.rotation(-intervalAngle * i, [0, -radius]);

            nodes[i].set({ x, y });
        }

        const tableY = -radius,
              tableX = radius + 20;

        for(i = 0; i < tableHeadNode.length; i++) {
            let node = tableHeadNode[i],
                height = node.get('size')[1];

            node.set({
                x: tableX,
                y: tableY + node.get('y') + i * height
            });

            if(node.headNext) {
                let y = node.get('y') + height - node.headNext.get('size')[1],
                    x = tableX + layoutOptions.xInterval * 2.5;

                node.headNext.set({ x, y });
                this.layoutItem(node.headNext, null, layoutOptions);
            }
        }

    }
});