285 lines
9.2 KiB
TypeScript
285 lines
9.2 KiB
TypeScript
'use client';
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import { useCallback, useEffect } from 'react';
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import ReactFlow, {
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Node,
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Edge,
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Controls,
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Background,
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useNodesState,
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useEdgesState,
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addEdge,
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Connection,
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ReactFlowProvider,
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Panel,
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MarkerType,
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useReactFlow,
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} from 'reactflow';
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import 'reactflow/dist/style.css';
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import { Button } from '@/components/ui/button';
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import { Plus, Download, Save, Layout } from 'lucide-react';
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// Define custom node styles (simplified for now)
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const nodeStyle = {
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padding: '10px 20px',
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borderRadius: '8px',
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border: '1px solid #ddd',
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fontSize: '14px',
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fontWeight: 500,
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background: 'white',
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color: '#333',
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width: 180, // Increased width for role display
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textAlign: 'center' as const,
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whiteSpace: 'pre-wrap' as const, // Allow multiline
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};
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const conditionNodeStyle = {
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...nodeStyle,
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background: '#fef3c7', // Amber-100
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borderColor: '#d97706', // Amber-600
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borderStyle: 'dashed',
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borderRadius: '24px', // More rounded
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};
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const initialNodes: Node[] = [
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{
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id: '1',
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type: 'input',
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data: { label: 'Start' },
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position: { x: 250, y: 5 },
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style: { ...nodeStyle, background: '#10b981', color: 'white', border: 'none' },
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},
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];
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interface VisualWorkflowBuilderProps {
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initialNodes?: Node[];
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initialEdges?: Edge[];
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dslString?: string; // New prop
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onSave?: (nodes: Node[], edges: Edge[]) => void;
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onDslChange?: (dsl: string) => void;
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}
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function parseDSL(dsl: string): { nodes: Node[], edges: Edge[] } {
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const nodes: Node[] = [];
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const edges: Edge[] = [];
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let yOffset = 50;
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try {
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const parsedDsl = JSON.parse(dsl);
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const states = parsedDsl.states || [];
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states.forEach((state: { id?: string, name: string, type?: string, role?: string, initial?: boolean, terminal?: boolean, on?: Record<string, { to: string }> }) => {
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const isCondition = state.type === 'CONDITION';
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const isStart = state.initial === true || state.type === 'START';
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const isEnd = state.terminal === true || state.type === 'END';
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let nodeType = 'default';
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let style = { ...nodeStyle };
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if (isStart) {
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nodeType = 'input';
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style = { ...nodeStyle, background: '#10b981', color: 'white', border: 'none' };
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} else if (isEnd) {
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nodeType = 'output';
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style = { ...nodeStyle, background: '#ef4444', color: 'white', border: 'none' };
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} else if (isCondition) {
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style = conditionNodeStyle;
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}
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nodes.push({
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id: state.name || state.id || `node-${Date.now()}`,
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type: nodeType,
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data: {
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label: isStart || isEnd ? state.name : `${state.name}\n(${state.role || 'No Role'})`,
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name: state.name,
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role: state.role,
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type: state.type || (isStart ? 'START' : isEnd ? 'END' : 'TASK')
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},
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position: { x: 250, y: yOffset },
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style: style
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});
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if (state.on) {
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const transitions = state.on;
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Object.keys(transitions).forEach((eventName) => {
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const trans = transitions[eventName];
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if (trans && trans.to) {
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edges.push({
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id: `e-${state.name || state.id || 'node'}-${trans.to}`,
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source: state.name || state.id || 'node',
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target: trans.to,
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label: eventName,
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markerEnd: { type: MarkerType.ArrowClosed }
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});
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}
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});
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}
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yOffset += 120;
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});
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} catch (e) {
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console.error("Failed to parse DSL as JSON", e);
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}
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return { nodes, edges };
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}
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function VisualWorkflowBuilderContent({ initialNodes: propNodes, initialEdges: propEdges, dslString, onSave, onDslChange }: VisualWorkflowBuilderProps) {
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const [nodes, setNodes, onNodesChange] = useNodesState(propNodes || initialNodes);
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const [edges, setEdges, onEdgesChange] = useEdgesState(propEdges || []);
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const { fitView } = useReactFlow();
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// Sync DSL to nodes when dslString changes
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useEffect(() => {
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if (dslString) {
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const { nodes: newNodes, edges: newEdges } = parseDSL(dslString);
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if (newNodes.length > 0) {
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setNodes(newNodes);
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setEdges(newEdges);
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// Fit view after update
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setTimeout(() => fitView(), 100);
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}
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}
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}, [dslString, setNodes, setEdges, fitView]);
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const onConnect = useCallback(
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(params: Connection) => setEdges((eds) => addEdge({ ...params, markerEnd: { type: MarkerType.ArrowClosed } }, eds)),
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[setEdges]
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);
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const addNode = (type: string, label: string) => {
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const id = `${type}-${Date.now()}`;
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const nodeType = type === 'condition' ? 'CONDITION' : type === 'end' ? 'END' : type === 'start' ? 'START' : 'TASK';
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const newNode: Node = {
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id,
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position: { x: Math.random() * 400 + 100, y: Math.random() * 300 + 100 },
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data: { label: label, name: label, role: 'User', type: nodeType },
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style: { ...nodeStyle },
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};
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if (type === 'end') {
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newNode.style = { ...nodeStyle, background: '#ef4444', color: 'white', border: 'none' };
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newNode.type = 'output';
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} else if (type === 'start') {
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newNode.style = { ...nodeStyle, background: '#10b981', color: 'white', border: 'none' };
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newNode.type = 'input';
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} else if (type === 'condition') {
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newNode.style = conditionNodeStyle;
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}
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setNodes((nds) => nds.concat(newNode));
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};
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const handleSave = () => {
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onSave?.(nodes, edges);
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};
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// Generate JSON DSL
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const generateDSL = () => {
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let hasStart = false;
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const states = nodes.map(n => {
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const outgoingEdges = edges.filter(e => e.source === n.id);
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const onConfig: Record<string, { to: string }> = {};
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outgoingEdges.forEach(e => {
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const eventName = e.label || 'PROCEED';
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onConfig[eventName as string] = { to: e.target };
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});
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const isStartNode = n.type === 'input';
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const isEndNode = n.type === 'output';
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if (isStartNode) hasStart = true;
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const stateObj: { name: string; type?: string; role?: string; initial?: boolean; terminal?: boolean; on?: Record<string, { to: string }> } = {
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name: n.data.name || n.data.label.split('\n')[0],
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};
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if (n.data.type && n.data.type !== 'START' && n.data.type !== 'END' && n.data.type !== 'TASK') {
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stateObj.type = n.data.type;
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}
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if (n.data.role && !isStartNode && !isEndNode) {
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stateObj.role = n.data.role;
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}
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if (isStartNode && !hasStart) {
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stateObj.initial = true;
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}
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if (isEndNode) {
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stateObj.terminal = true;
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}
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if (Object.keys(onConfig).length > 0) {
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stateObj.on = onConfig;
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}
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return stateObj;
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});
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const dslObj = {
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workflow: "VISUAL_WORKFLOW",
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version: 1,
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states
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};
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const dsl = JSON.stringify(dslObj, null, 2);
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console.log("Generated DSL:", dsl);
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onDslChange?.(dsl);
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alert("DSL Updated from Visual Builder!");
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};
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return (
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<div className="space-y-4 h-full flex flex-col">
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<div className="h-[600px] border rounded-lg overflow-hidden relative bg-slate-50 dark:bg-slate-950">
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<ReactFlow
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nodes={nodes}
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edges={edges}
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onNodesChange={onNodesChange}
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onEdgesChange={onEdgesChange}
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onConnect={onConnect}
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fitView
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attributionPosition="bottom-right"
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>
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<Controls />
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<Background color="#aaa" gap={16} />
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<Panel position="top-right" className="flex gap-2 p-2 bg-white/80 dark:bg-black/50 rounded-lg backdrop-blur-sm border shadow-sm">
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<Button size="sm" variant="secondary" onClick={() => addNode('step', 'New Step')}>
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<Plus className="mr-2 h-4 w-4" /> Add Step
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</Button>
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<Button size="sm" variant="secondary" onClick={() => addNode('condition', 'Condition')}>
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<Layout className="mr-2 h-4 w-4" /> Condition
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</Button>
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<Button size="sm" variant="secondary" onClick={() => addNode('end', 'End')}>
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<Plus className="mr-2 h-4 w-4" /> Add End
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</Button>
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</Panel>
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<Panel position="bottom-left" className="flex gap-2">
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<Button size="sm" onClick={handleSave}>
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<Save className="mr-2 h-4 w-4" /> Save Visual State
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</Button>
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<Button size="sm" variant="outline" onClick={generateDSL}>
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<Download className="mr-2 h-4 w-4" /> Generate DSL
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</Button>
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</Panel>
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</ReactFlow>
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</div>
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<div className="text-sm text-muted-foreground">
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<p>Tip: Drag to connect nodes. Use backspace to delete selected nodes.</p>
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</div>
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</div>
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);
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}
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export function VisualWorkflowBuilder(props: VisualWorkflowBuilderProps) {
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return (
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<ReactFlowProvider>
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<VisualWorkflowBuilderContent {...props} />
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</ReactFlowProvider>
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)
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}
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