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import {
  Handle,
  NodeResizeControl,
  type Position,
  useReactFlow,
} from "@xyflow/react";
// @ts-ignore
import ChevronDownRight from "~icons/tabler/chevron-down-right.jsx";

interface LynxKiteNodeProps {
  id: string;
  width: number;
  height: number;
  nodeStyle: any;
  data: any;
  children: any;
}

function getHandles(inputs: object, outputs: object) {
  const handles: {
    position: "top" | "bottom" | "left" | "right";
    name: string;
    index: number;
    offsetPercentage: number;
    showLabel: boolean;
    type: "source" | "target";
  }[] = [];
  for (const e of Object.values(inputs)) {
    handles.push({ ...e, type: "target" });
  }
  for (const e of Object.values(outputs)) {
    handles.push({ ...e, type: "source" });
  }
  const counts = { top: 0, bottom: 0, left: 0, right: 0 };
  for (const e of handles) {
    e.index = counts[e.position];
    counts[e.position]++;
  }
  for (const e of handles) {
    e.offsetPercentage = (100 * (e.index + 1)) / (counts[e.position] + 1);
    const simpleHorizontal =
      counts.top === 0 && counts.bottom === 0 && handles.length <= 2;
    const simpleVertical =
      counts.left === 0 && counts.right === 0 && handles.length <= 2;
    e.showLabel = !simpleHorizontal && !simpleVertical;
  }
  return handles;
}

export default function LynxKiteNode(props: LynxKiteNodeProps) {
  const reactFlow = useReactFlow();
  const data = props.data;
  const expanded = !data.collapsed;
  const handles = getHandles(data.meta?.inputs || {}, data.meta?.outputs || {});
  function titleClicked() {
    reactFlow.updateNodeData(props.id, { collapsed: expanded });
  }
  const handleOffsetDirection = {
    top: "left",
    bottom: "left",
    left: "top",
    right: "top",
  };

  return (
    <div
      className={`node-container ${expanded ? "expanded" : "collapsed"} `}
      style={{
        width: props.width || 200,
        height: expanded ? props.height || 200 : undefined,
      }}
    >
      <div className="lynxkite-node" style={props.nodeStyle}>
        <div
          className={`title bg-primary ${data.status}`}
          onClick={titleClicked}
        >
          {data.title}
          {data.error && <span className="title-icon">⚠️</span>}
          {expanded || <span className="title-icon"></span>}
        </div>
        {expanded && (
          <>
            {data.error && <div className="error">{data.error}</div>}
            {props.children}
            <NodeResizeControl
              minWidth={100}
              minHeight={50}
              style={{ background: "transparent", border: "none" }}
            >
              <ChevronDownRight className="node-resizer" />
            </NodeResizeControl>
          </>
        )}
        {handles.map((handle) => (
          <Handle
            key={handle.name}
            id={handle.name}
            type={handle.type}
            position={handle.position as Position}
            style={{
              [handleOffsetDirection[handle.position]]:
                `${handle.offsetPercentage}% `,
            }}
          >
            {handle.showLabel && (
              <span className="handle-name">
                {handle.name.replace(/_/g, " ")}
              </span>
            )}
          </Handle>
        ))}
      </div>
    </div>
  );
}