import React, { useState, useCallback, useRef, useEffect } from 'react';
import {
  ReactFlow,
  applyNodeChanges,
  applyEdgeChanges,
  addEdge,
  reconnectEdge,
  Background,
  Controls,
  Node,
  Edge,
  ReactFlowProvider,
  useReactFlow,
  EdgeTypes,
  SelectionMode,
  useStoreApi,
  Panel
} from '@xyflow/react';
import '@xyflow/react/dist/style.css';
import { nodeTypeMap, nodeTypes, registerNodeType } from './node';
import SideBar from './sideBar/sideBar';
import { convertFlowData } from '@/utils/convertFlowData';
import { exampleFlowData } from '@/pages/flowEditor/test/exampleFlowData';
import LocalNode from '@/pages/flowEditor/node/localNode/LocalNode';
import CustomEdge from './components/customEdge';
import NodeContextMenu from './components/nodeContextMenu';
import EdgeContextMenu from './components/edgeContextMenu';
import NodeEditModal from './components/nodeEditModal';

const edgeTypes: EdgeTypes = {
  custom: CustomEdge
};

const FlowEditorWithProvider: React.FC = () => {
  return (
    <div style={{ width: '100%', height: '91vh', display: 'flex' }}>
      <ReactFlowProvider>
        <SideBar />
        <FlowEditor />
      </ReactFlowProvider>
    </div>
  );
};

const FlowEditor: React.FC = () => {
  const [nodes, setNodes] = useState<Node[]>([]);
  const [edges, setEdges] = useState<Edge[]>([]);
  const reactFlowInstance = useReactFlow();
  const reactFlowWrapper = useRef<HTMLDivElement>(null);
  const [menu, setMenu] = useState<{
    id: string;
    type: 'node' | 'edge';
    top: number;
    left: number;
  } | null>(null);
  const store = useStoreApi();

  // 添加编辑弹窗相关状态
  const [editingNode, setEditingNode] = useState<Node | null>(null);
  const [isEditModalOpen, setIsEditModalOpen] = useState(false);

  const onNodesChange = useCallback(
    (changes: any) => {
      const newNodes = applyNodeChanges(changes, nodes);
      setNodes(newNodes);
      // 如果需要在节点变化时执行某些操作，可以在这里添加
    },
    [nodes]
  );

  const onEdgesChange = useCallback(
    (changes: any) => {
      const newEdges = applyEdgeChanges(changes, edges);
      setEdges(newEdges);
      // 如果需要在边变化时执行某些操作，可以在这里添加
    },
    [edges]
  );

  const onConnect = useCallback(
    (params: any) => setEdges((edgesSnapshot) => addEdge({ ...params, type: 'custom' }, edgesSnapshot)),
    []
  );

  // 边重新连接处理
  const onReconnect = useCallback(
    (oldEdge: Edge, newConnection: any) =>
      setEdges((els) => reconnectEdge(oldEdge, newConnection, els)),
    []
  );

  const onDragOver = useCallback((event: React.DragEvent) => {
    event.preventDefault();
    event.dataTransfer.dropEffect = 'move';
  }, []);

  // 侧边栏节点实例
  const onDrop = useCallback(
    (event: React.DragEvent) => {
      event.preventDefault();

      if (!reactFlowInstance) return;

      const callBack = event.dataTransfer.getData('application/reactflow');
      const nodeData = JSON.parse(callBack);
      if (typeof nodeData.nodeType === 'undefined' || !nodeData.nodeType) {
        return;
      }

      const position = reactFlowInstance.screenToFlowPosition({
        x: event.clientX,
        y: event.clientY
      });

      const newNode = {
        id: `${nodeData.nodeType}-${Date.now()}`,
        type: nodeData.nodeType,
        position,
        data: { ...nodeData.data, title: nodeData.nodeName, type: nodeData.nodeType }
      };

      // 将未定义的节点动态追加进nodeTypes
      const nodeMap = Array.from(Object.values(nodeTypeMap).map(key => key));
      if (!nodeMap.includes(nodeData.nodeType)) registerNodeType(nodeData.nodeType, LocalNode, nodeData.nodeName);

      setNodes((nds) => nds.concat(newNode));
    },
    [reactFlowInstance]
  );

  useEffect(() => {
    const { nodes: convertedNodes, edges: convertedEdges } = convertFlowData(exampleFlowData);
    // 为所有边添加类型
    const initialEdges: Edge[] = convertedEdges.map(edge => ({
      ...edge,
      type: 'custom'
    }));
    setNodes(convertedNodes);
    setEdges(initialEdges);
  }, []);

  // 节点右键菜单处理
  const onNodeContextMenu = useCallback(
    (event: React.MouseEvent, node: Node) => {
      event.preventDefault();

      const pane = reactFlowWrapper.current?.getBoundingClientRect();
      if (!pane) return;

      setMenu({
        id: node.id,
        type: 'node',
        top: event.clientY - pane.top,
        left: event.clientX - pane.left
      });
    },
    [setMenu]
  );

  // 节点双击处理
  const onNodeDoubleClick = useCallback(
    (event: React.MouseEvent, node: Node) => {
      console.log('双击');
      setEditingNode(node);
      setIsEditModalOpen(true);
    },
    []
  );

  // 边右键菜单处理
  const onEdgeContextMenu = useCallback(
    (event: React.MouseEvent, edge: Edge) => {
      event.preventDefault();

      const pane = reactFlowWrapper.current?.getBoundingClientRect();
      if (!pane) return;

      setMenu({
        id: edge.id,
        type: 'edge',
        top: event.clientY - pane.top,
        left: event.clientX - pane.left
      });
    },
    [setMenu]
  );

  // 点击画布其他区域关闭菜单
  const onPaneClick = useCallback(() => setMenu(null), [setMenu]);

  // 关闭编辑弹窗
  const closeEditModal = useCallback(() => {
    setIsEditModalOpen(false);
    setEditingNode(null);
  }, []);

  // 保存节点编辑
  const saveNodeEdit = useCallback((updatedData: any) => {
    const updatedNodes = nodes.map((node) => {
      if (node.id === editingNode?.id) {
        return {
          ...node,
          data: { ...node.data, ...updatedData }
        };
      }
      return node;
    });

    setNodes(updatedNodes);
    closeEditModal();

    // TODO 如果需要在节点编辑后立即保存到服务器，可以调用保存函数
    // saveFlowDataToServer();
  }, [nodes, editingNode, closeEditModal]);

  // 删除节点
  const deleteNode = useCallback((node: Node) => {
    setNodes((nds) => nds.filter((n) => n.id !== node.id));
    setEdges((eds) => eds.filter((e) => e.source !== node.id && e.target !== node.id));
    setMenu(null);
  }, []);

  // 删除边
  const deleteEdge = useCallback((edge: Edge) => {
    setEdges((eds) => eds.filter((e) => e.id !== edge.id));
    setMenu(null);
  }, []);

  // 编辑节点
  const editNode = useCallback((node: Node) => {
    setMenu(null);
    setEditingNode(node);
    setIsEditModalOpen(true);
  }, []);

  // 编辑边
  const editEdge = useCallback((edge: Edge) => {
    // 这里可以实现边编辑逻辑
    console.log('编辑边:', edge);
    setMenu(null);
  }, []);

  // 复制节点
  const copyNode = useCallback((node: Node) => {
    // 这里可以实现节点复制逻辑
    console.log('复制节点:', node);
    setMenu(null);
  }, []);

  // 保存所有节点和边数据到服务器
  const saveFlowDataToServer = useCallback(async () => {
    try {
      // 准备要发送到服务器的数据
      const flowData = {
        nodes: nodes,
        edges: edges
      };
      // TODO 接口对接后修改后续的更新操作
      console.log('flowData:', flowData);
      return;
      // 发送到服务器的示例代码（需要根据您的实际API进行调整）
      const response = await fetch('/api/flow/save', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json'
        },
        body: JSON.stringify(flowData)
      });

      if (response.ok) {
        console.log('Flow data saved successfully');
        // 可以添加成功提示
      }
      else {
        console.error('Failed to save flow data');
        // 可以添加失败提示
      }
    } catch (error) {
      console.error('Error saving flow data:', error);
      // 可以添加错误提示
    }
  }, [nodes, edges]);

  return (
    <div ref={reactFlowWrapper} style={{ width: '100%', height: '100%', position: 'relative' }}>
      <ReactFlow
        nodes={nodes}
        edges={edges}
        nodeTypes={nodeTypes}
        edgeTypes={edgeTypes}
        onNodesChange={onNodesChange}
        onEdgesChange={onEdgesChange}
        onConnect={onConnect}
        onReconnect={onReconnect}
        onDrop={onDrop}
        onDragOver={onDragOver}
        onNodeContextMenu={onNodeContextMenu}
        onEdgeContextMenu={onEdgeContextMenu}
        onNodeDoubleClick={onNodeDoubleClick}
        onPaneClick={onPaneClick}
        onPaneContextMenu={onPaneClick}
        fitView
        selectionKeyCode={['Meta', 'Control']}
        selectionMode={SelectionMode.Partial}
        panOnDrag={[0, 1, 2]} // 支持多点触控平移
        zoomOnScroll={true}
        zoomOnPinch={true}
        panOnScrollSpeed={0.5}
      >
        <Background />
        <Controls />
        <Panel position="top-right">
          <div>从左侧拖拽节点到画布中</div>
          <button onClick={saveFlowDataToServer}>保存到服务器</button>
        </Panel>
      </ReactFlow>

      {/*节点右键上下文*/}
      {menu && menu.type === 'node' && (
        <div
          style={{
            position: 'absolute',
            top: menu.top,
            left: menu.left,
            zIndex: 1000
          }}
        >
          <NodeContextMenu
            node={nodes.find(n => n.id === menu.id)!}
            onDelete={deleteNode}
            onEdit={editNode}
            onCopy={copyNode}
          />
        </div>
      )}

      {/*边右键上下文*/}
      {menu && menu.type === 'edge' && (
        <div
          style={{
            position: 'absolute',
            top: menu.top,
            left: menu.left,
            zIndex: 1000
          }}
        >
          <EdgeContextMenu
            edge={edges.find(e => e.id === menu.id)!}
            onDelete={deleteEdge}
            onEdit={editEdge}
          />
        </div>
      )}

      {/*节点双击/节点编辑上下文*/}
      <NodeEditModal
        node={editingNode}
        isOpen={isEditModalOpen}
        onSave={saveNodeEdit}
        onClose={closeEditModal}
      />
    </div>
  );

};

export default FlowEditorWithProvider;