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* Draggable node-graph canvas (direct-manipulation primitive).
*
* Generic over node payloads: the caller owns the graph state and receives
* `onMoveNode` / `onConnect` / `onSelect` callbacks; this component renders
* nodes (default card rendering or a custom `renderNode`), bezier edges with
* arrowheads, drag with snap-to-grid, and interactive edge drawing from a
* node's output port to another node's input port.
*
* Used by the Pipeline Builder; reusable for any stage/flow editor.
*/
import { useState, type ReactNode } from 'react';
import CanvasSurface, { snapTo, worldDrag, type CanvasApi } from './canvas';
import { tokens } from '../../theme';
export interface GraphNode {
id: string;
x: number;
y: number;
label: string;
sublabel?: string;
color?: string;
w?: number;
h?: number;
badge?: string;
}
export interface GraphEdge {
from: string;
to: string;
label?: string;
color?: string;
dashed?: boolean;
}
interface NodeCanvasProps {
nodes: GraphNode[];
edges: GraphEdge[];
selectedId?: string | null;
onSelect?: (id: string | null) => void;
onMoveNode?: (id: string, x: number, y: number) => void;
/** When provided, dragging from a node's output port draws a new edge. */
onConnect?: (fromId: string, toId: string) => void;
height?: number | string;
world?: { x: number; y: number; w: number; h: number };
snap?: number;
nodeW?: number;
nodeH?: number;
renderNode?: (node: GraphNode, selected: boolean) => ReactNode;
ariaLabel?: string;
}
const DEFAULT_W = 132;
const DEFAULT_H = 56;
function edgePath(from: GraphNode, to: GraphNode, w: number, h: number): string {
const fw = from.w ?? w;
const tw = to.w ?? w;
const sx = from.x + fw / 2;
const sy = from.y;
const ex = to.x - tw / 2 - 4;
const ey = to.y;
if (ex < sx - 20) {
// feedback edge: loop under both nodes
const fh = from.h ?? h;
const drop = Math.max(from.y, to.y) + fh + 40;
return `M ${from.x} ${from.y + fh / 2} C ${from.x} ${drop}, ${to.x} ${drop}, ${to.x} ${to.y + (to.h ?? h) / 2 + 4}`;
}
const mx = (sx + ex) / 2;
return `M ${sx} ${sy} C ${mx} ${sy}, ${mx} ${ey}, ${ex} ${ey}`;
}
export default function NodeCanvas({
nodes,
edges,
selectedId,
onSelect,
onMoveNode,
onConnect,
height = 480,
world = { x: 0, y: 0, w: 1200, h: 520 },
snap = 20,
nodeW = DEFAULT_W,
nodeH = DEFAULT_H,
renderNode,
ariaLabel,
}: NodeCanvasProps) {
const byId = new Map(nodes.map((n) => [n.id, n]));
const [dragOffset, setDragOffset] = useState<{ id: string; dx: number; dy: number } | null>(null);
const [pendingEdge, setPendingEdge] = useState<{ fromId: string; x: number; y: number; overId: string | null } | null>(null);
const nodeAt = (x: number, y: number): GraphNode | null =>
nodes.find((n) => {
const w2 = (n.w ?? nodeW) / 2;
const h2 = (n.h ?? nodeH) / 2;
return x >= n.x - w2 - 8 && x <= n.x + w2 + 8 && y >= n.y - h2 - 8 && y <= n.y + h2 + 8;
}) ?? null;
return (
<CanvasSurface
world={world}
height={height}
gridStep={snap * 2}
onBackgroundClick={() => onSelect?.(null)}
ariaLabel={ariaLabel ?? 'Node graph canvas'}
>
{(api: CanvasApi) => (
<>
<defs>
<marker id="nc-arrow" viewBox="0 0 10 10" refX="9" refY="5" markerWidth="6" markerHeight="6" orient="auto-start-reverse">
<path d="M 0 0 L 10 5 L 0 10 z" fill="#4a5561" />
</marker>
<marker id="nc-arrow-hot" viewBox="0 0 10 10" refX="9" refY="5" markerWidth="6" markerHeight="6" orient="auto-start-reverse">
<path d="M 0 0 L 10 5 L 0 10 z" fill={tokens.color.info} />
</marker>
</defs>
{edges.map((edge, i) => {
const from = byId.get(edge.from);
const to = byId.get(edge.to);
if (!from || !to) return null;
const hot = selectedId === edge.from || selectedId === edge.to;
return (
<g key={`${edge.from}->${edge.to}-${i}`}>
<path
d={edgePath(from, to, nodeW, nodeH)}
fill="none"
stroke={hot ? tokens.color.info : edge.color ?? '#4a5561'}
strokeWidth={hot ? 2 : 1.5}
strokeDasharray={edge.dashed ? '5 4' : undefined}
markerEnd={hot ? 'url(#nc-arrow-hot)' : 'url(#nc-arrow)'}
style={{ transition: `stroke ${tokens.motion.fast}` }}
/>
{edge.label ? (
<text
x={(from.x + to.x) / 2}
y={(from.y + to.y) / 2 - 8}
textAnchor="middle"
fill={tokens.color.textDim}
fontSize={10.5}
>
{edge.label}
</text>
) : null}
</g>
);
})}
{/* edge being drawn */}
{pendingEdge ? (() => {
const from = byId.get(pendingEdge.fromId);
if (!from) return null;
return (
<path
d={`M ${from.x + (from.w ?? nodeW) / 2} ${from.y} L ${pendingEdge.x} ${pendingEdge.y}`}
fill="none"
stroke={tokens.color.info}
strokeWidth={2}
strokeDasharray="6 4"
markerEnd="url(#nc-arrow-hot)"
pointerEvents="none"
/>
);
})() : null}
{nodes.map((node) => {
const w = node.w ?? nodeW;
const h = node.h ?? nodeH;
const selected = selectedId === node.id;
const targeted = pendingEdge?.overId === node.id && pendingEdge.fromId !== node.id;
const drag = onMoveNode
? worldDrag(api, {
onStart: (p) => {
setDragOffset({ id: node.id, dx: node.x - p.x, dy: node.y - p.y });
onSelect?.(node.id);
},
onMove: (p) => {
const off = dragOffset && dragOffset.id === node.id ? dragOffset : { dx: 0, dy: 0 };
onMoveNode(node.id, snapTo(p.x + off.dx, snap), snapTo(p.y + off.dy, snap));
},
onEnd: () => setDragOffset(null),
})
: { onPointerDown: (e: React.PointerEvent) => { e.stopPropagation(); onSelect?.(node.id); } };
return (
<g key={node.id} {...drag} style={{ cursor: onMoveNode ? 'grab' : 'pointer' }}>
{renderNode ? (
renderNode(node, selected)
) : (
<>
<rect
x={node.x - w / 2}
y={node.y - h / 2}
width={w}
height={h}
rx={8}
fill={selected ? tokens.color.surfaceRaised : tokens.color.surface}
stroke={targeted ? tokens.color.success : selected ? tokens.color.info : node.color ?? tokens.color.borderStrong}
strokeWidth={selected || targeted ? 2.5 : 2}
style={{ transition: `stroke ${tokens.motion.fast}` }}
/>
<text x={node.x} y={node.y + (node.sublabel ? -2 : 4)} textAnchor="middle" fill={tokens.color.text} fontSize={12} fontWeight={700} pointerEvents="none">
{node.label}
</text>
{node.sublabel ? (
<text x={node.x} y={node.y + 14} textAnchor="middle" fill={node.color ?? tokens.color.textDim} fontSize={9.5} fontWeight={600} pointerEvents="none">
{node.sublabel}
</text>
) : null}
{node.badge ? (
<g pointerEvents="none">
<rect x={node.x + w / 2 - 26} y={node.y - h / 2 - 9} width={30} height={16} rx={8} fill={tokens.color.dangerStrong} />
<text x={node.x + w / 2 - 11} y={node.y - h / 2 + 3} textAnchor="middle" fill="#fff" fontSize={9.5} fontWeight={800}>
{node.badge}
</text>
</g>
) : null}
</>
)}
{/* connection ports */}
{onConnect ? (
<>
{/* input port (left) */}
<circle cx={node.x - w / 2} cy={node.y} r={5} fill={targeted ? tokens.color.success : '#4a5561'} stroke={tokens.color.surfaceSunken} strokeWidth={1.5} pointerEvents="none" />
{/* output port (right) — drag to draw an edge */}
<circle
cx={node.x + w / 2}
cy={node.y}
r={6}
fill={pendingEdge?.fromId === node.id ? tokens.color.info : '#5c6873'}
stroke={tokens.color.surfaceSunken}
strokeWidth={1.5}
style={{ cursor: 'crosshair' }}
{...worldDrag(api, {
onStart: (p) => setPendingEdge({ fromId: node.id, x: p.x, y: p.y, overId: null }),
onMove: (p) => setPendingEdge({ fromId: node.id, x: p.x, y: p.y, overId: nodeAt(p.x, p.y)?.id ?? null }),
onEnd: (p) => {
const target = nodeAt(p.x, p.y);
if (target && target.id !== node.id) onConnect(node.id, target.id);
setPendingEdge(null);
},
})}
/>
</>
) : null}
</g>
);
})}
</>
)}
</CanvasSurface>
);
}
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