/*
 * This file is part of the kernelstudio package.
 *
 * (c) 2014-2025 zlin <admin@kernelstudio.com>
 *
 * For the full copyright and license information, please view the LICENSE file
 * that was distributed with this source code.
 */

import { Edge, Graph, Path, Selection } from '@antv/x6';
import type { ModelElement } from './element';
import type { Connecting } from '@antv/x6/lib/graph/options';
import { createLineOptions } from './line';

Graph.registerConnector(
  'sequenceFlowConnector',
  (s, e) => {
    const offset = 4;
    const deltaY = Math.abs(e.y - s.y);
    const control = Math.floor((deltaY / 3) * 2);

    const v1 = { x: s.x, y: s.y + offset + control };
    const v2 = { x: e.x, y: e.y - offset - control };

    return Path.parse(
      `
      M ${s.x} ${s.y}
      L ${s.x} ${s.y + offset}
      C ${v1.x} ${v1.y} ${v2.x} ${v2.y} ${e.x} ${e.y - offset}
      L ${e.x} ${e.y}
    `,
    ).serialize();
  },
  true,
);

export const createGraphConnectingAttributes = (): Partial<Connecting> => {
  const lineOptions = createLineOptions();
  return {
    snap: true, // 当 snap 设置为 true 时连线的过程中距离节点或者连接桩 50px 时会触发自动吸附
    allowBlank: false,  // 是否允许连接到画布空白位置的点，默认为 true
    allowLoop: false, // 是否允许创建循环连线，即边的起始节点和终止节点为同一节点，默认为 true
    highlight: true,  // 当连接到节点时，通过 sourceAnchor 来指定源节点的锚点。
    connector: 'smooth',
    connectionPoint: 'anchor',  // 指定连接点，默认值为 boundary。
    anchor: 'center',
    // validateMagnet({ magnet }) {
    //   return magnet.getAttribute('port-group') !== 'top'
    // },
    // 验证连接
    createEdge(this: Graph) {
      const edge: Edge = this.createEdge({
        shape: 'edge',
        ...lineOptions, // 应用动画配置
        attrs: lineOptions.attrs,
        animation: lineOptions.animation,
        markup: lineOptions.markup,
      });
      return edge;
    },
    validateConnection(this: Graph, { sourceCell, targetCell }) {
      console.error('validateConnection');
      if (!sourceCell || !targetCell) return false;

      // 核心逻辑：禁止节点连接自己（自环）
      if (sourceCell === targetCell) {
        return false;
      }

      // const sourceData = sourceCell.getData() as GraphElement;
      const targetData = targetCell.getData() as ModelElement;

      // 根节点不能作为子节点
      if (targetData.type === 'startEvent') {
        return false;
      }

      // 4. 新增核心逻辑：检查源节点是否已有出边（已连接其他节点）
      // const hasOutgoingEdge = this.getOutgoingEdges(sourceCell);
      // if (hasOutgoingEdge && hasOutgoingEdge.length > 1) {
      //   return false;
      // }

      // 检查是否已存在相同连接
      // const edges: Edge[] = this.getEdges();
      // const existingConnection = edges.find(edge =>
      //   edge.getSourceCell() === sourceCell &&
      //   edge.getTargetCell() === targetCell,
      // );
      //
      // return !existingConnection;
      return true;
    },
  };
};

export const createGraphCanvas = (container: HTMLDivElement, readonly: boolean = false): Graph => {
  const graph = new Graph({
    container: container,
    grid: {
      size: 20,
      visible: true,
      type: 'dot',
      // color: '#e5e7eb'
    },
    // 确保启用了异步渲染
    async: true,
    panning: {
      enabled: true,
      eventTypes: ['leftMouseDown', 'mouseWheel'],
    },
    mousewheel: {
      enabled: true,
      modifiers: 'ctrl',
      factor: 1.1,
      maxScale: 1.5,
      minScale: 0.5,
    },
    highlighting: {
      magnetAdsorbed: {
        name: 'stroke',
        args: {
          attrs: {
            fill: '#fff',
            stroke: '#31d0c6',
            strokeWidth: 4,
          },
        },
      },
    },
    connecting: createGraphConnectingAttributes(),

    scaling: {
      min: 0.5,
      max: 2,
    },

    // 背景配置
    background: {},

    // 交互配置
    interacting: (cellView) => {
      if (readonly) {
        return false; // 只读模式下禁用所有交互
      }

      // 确保边（edge）的顶点交互权限开启
      if (cellView.cell.isEdge()) {
        return {
          vertexAddable: true,    // 允许添加顶点
          vertexMovable: true,    // 允许移动顶点
          vertexDeletable: true,  // 允许删除顶点
          edgeMovable: true,      // 允许整体拖动连线
          arrowheadMovable: true,  // 允许拖动箭头调整端点
        };
      }

      // 节点的交互配置（保持不变）
      return {
        nodeMovable: true,
      };
    },
  });

  graph.use(
    new Selection({
      multiple: true,
      rubberEdge: true,
      rubberNode: true,
      modifiers: 'shift',
      rubberband: true,
    }),
  );

  return graph;

};