Flow

'use client';

import { useCallback, useState } from 'react';
import { Button } from '@/components/ui/button';
import { Flow } from '@/components/panelui/flow';

/** An article on its way to being published. */
const STAGES = [
  { id: 'draft', name: 'Draft', detail: '1,840 words' },
  { id: 'edit', name: 'Edit', detail: 'Two rounds' },
  { id: 'check', name: 'Fact check', detail: '14 claims' },
  { id: 'legal', name: 'Legal read', detail: 'One quote to clear' },
  { id: 'schedule', name: 'Schedule', detail: 'Thursday, 09:00' },
  { id: 'publish', name: 'Publish', detail: 'Site and newsletter' },
];

const TAG = {
  done: 'bg-[color-mix(in_oklab,var(--success)_14%,transparent)] text-(--success)',
  live: 'bg-[color-mix(in_oklab,var(--info)_14%,transparent)] text-(--info)',
  waiting: 'bg-muted text-muted-foreground',
};

/**
 * Whether the canvas has room to lay the graph out across. It is the canvas
 * that is measured and not the window: in a page with a sidebar the two are
 * far apart.
 */
function useRoom(least: number) {
  const [wide, setWide] = useState(true);
  const watch = useCallback(
    (node: HTMLElement | null) => {
      if (!node) return;
      const observer = new ResizeObserver(([entry]) => setWide(entry.contentRect.width >= least));
      observer.observe(node);
      return () => observer.disconnect();
    },
    [least]
  );
  return [wide, watch] as const;
}

export default function FlowPipeline() {
  // The stage being worked on. Everything before it is done.
  const [at, setAt] = useState(1);
  const [wide, watch] = useRoom(720);
  const columns = wide ? 3 : 2;

  // The stages run along a row and back along the next, like a snake.
  const place = (index: number) => {
    const row = Math.floor(index / columns);
    const along = index % columns;
    const column = row % 2 ? columns - 1 - along : along;
    return { x: column * (wide ? 340 : 216), y: row * (wide ? 230 : 160) };
  };

  return (
    <div ref={watch} className="relative h-[34rem] w-full">
      <Flow
        // Laid out afresh, and fitted afresh, when the room for it changes.
        key={columns}
        fitViewOnMount
        fitViewPadding={wide ? 48 : 20}
        label="Article pipeline"
        className="h-full rounded-none border-0"
      >
        <Flow.Background variant="lines" gap={28} />
        {STAGES.map((stage, index) => {
          const state = index < at ? 'done' : index === at ? 'live' : 'waiting';
          return (
            <Flow.Node
              key={stage.id}
              id={stage.id}
              position={place(index)}
              className={wide ? 'w-52' : 'w-44'}
            >
              <div className="flex items-center justify-between gap-3 border-b px-4 py-2.5">
                <span className="text-sm text-muted-foreground">Stage {index + 1}</span>
                <span className={`rounded-full px-2 py-0.5 text-xs font-medium ${TAG[state]}`}>
                  {state === 'done' ? 'Done' : state === 'live' ? 'Now' : 'Waiting'}
                </span>
              </div>
              <div className="px-4 py-3">
                <p className="text-sm font-medium">{stage.name}</p>
                <p className="truncate text-sm text-muted-foreground">{stage.detail}</p>
              </div>
            </Flow.Node>
          );
        })}
        {STAGES.slice(1).map((stage, index) => (
          <Flow.Edge
            key={stage.id}
            from={STAGES[index].id}
            to={stage.id}
            variant="smoothstep"
            gap={10}
            arrow
            // Only the edge into the stage being worked on is marching.
            animated={index + 1 === at}
            color={index + 1 === at ? 'info' : undefined}
          />
        ))}
        {/* Fewer buttons where the graph needs the room. */}
        <Flow.Controls fit={wide} lock={wide} />
      </Flow>

      <div className="absolute bottom-3 left-3 flex gap-2">
        <Button variant="outline" size="sm" disabled={at === 0} onClick={() => setAt(at - 1)}>
          Back a stage
        </Button>
        <Button size="sm" disabled={at === STAGES.length - 1} onClick={() => setAt(at + 1)}>
          Advance
        </Button>
      </div>
    </div>
  );
}

'use client';

import { useCallback, useState } from 'react';
import { Button } from '@/components/ui/button';
import { Flow, type FlowConnection } from '@/components/panelui/flow';

/** Each step, and where it sits: across a wide screen, down a narrow one. */
const NODES = [
  {
    id: 'form',
    name: 'Sign-up form',
    across: { x: 0, y: 90 },
    down: { x: 0, y: 0 },
  },
  {
    id: 'verify',
    name: 'Verify email',
    across: { x: 320, y: 0 },
    down: { x: 150, y: 80 },
  },
  {
    id: 'welcome',
    name: 'Welcome message',
    across: { x: 320, y: 180 },
    down: { x: 0, y: 160 },
  },
  {
    id: 'crm',
    name: 'Add to CRM',
    across: { x: 680, y: 90 },
    down: { x: 150, y: 240 },
  },
];

/**
 * Whether the canvas has room to lay the graph out across. It is the canvas
 * that is measured and not the window: in a page with a sidebar the two are
 * far apart.
 */
function useRoom(least: number) {
  const [wide, setWide] = useState(true);
  const watch = useCallback(
    (node: HTMLElement | null) => {
      if (!node) return;
      const observer = new ResizeObserver(([entry]) => setWide(entry.contentRect.width >= least));
      observer.observe(node);
      return () => observer.disconnect();
    },
    [least]
  );
  return [wide, watch] as const;
}

const START: FlowConnection[] = [{ source: 'form', target: 'verify' }];

export default function FlowWiring() {
  const [wires, setWires] = useState(START);
  const [wide, watch] = useRoom(720);
  // A wire leaves one face of a step and arrives at the opposite one.
  const out = wide ? 'right' : 'bottom';
  const into = wide ? 'left' : 'top';

  const joined = (a: FlowConnection, b: FlowConnection) =>
    a.source === b.source && a.target === b.target;

  return (
    <div ref={watch} className="relative h-[26rem] w-full">
      <Flow
        // Fitted afresh when the layout changes.
        key={wide ? 'across' : 'down'}
        fitViewOnMount
        fitViewPadding={wide ? 48 : 24}
        label="Sign-up automation"
        className="h-full rounded-none border-0"
        // Two nodes are joined once. A second wire between them is refused.
        isValidConnection={(connection) => !wires.some((wire) => joined(wire, connection))}
        onConnect={(connection) => setWires((current) => [...current, connection])}
      >
        <Flow.Background />
        {NODES.map((node) => (
          <Flow.Node
            key={node.id}
            id={node.id}
            position={wide ? node.across : node.down}
            className="px-4 py-3"
          >
            <p className="whitespace-nowrap text-sm font-medium">{node.name}</p>
            <Flow.Handle position={into} />
            <Flow.Handle position={out} />
          </Flow.Node>
        ))}
        {wires.map((wire) => (
          <Flow.Edge
            key={`${wire.source}-${wire.target}`}
            from={wire.source}
            to={wire.target}
            arrow
            fromSide={out}
            toSide={into}
          />
        ))}
        <Flow.Controls lock={false} />
      </Flow>

      <div className="absolute bottom-3 left-3 flex max-w-[calc(100%-4.5rem)] items-center gap-3 rounded-xl border bg-card py-1.5 pe-1.5 ps-3 shadow-sm">
        <p className="text-sm text-muted-foreground">
          {wide ? 'Drag from a dot on one step to another step to join them. ' : null}
          {wires.length} joined.
        </p>
        <Button variant="outline" size="sm" onClick={() => setWires(START)}>
          Reset
        </Button>
      </div>
    </div>
  );
}

'use client';

import {
  ArchiveIcon,
  DatabaseIcon,
  GlobeIcon,
  HardDriveIcon,
  ServerIcon,
  ShieldCheckIcon,
} from 'lucide-react';
import { useCallback, useState, type ReactNode } from 'react';
import { Flow } from '@/components/panelui/flow';

function Service({ icon, name, detail }: { icon: ReactNode; name: string; detail: string }) {
  return (
    <div className="flex w-48 items-center gap-3 rounded-xl border bg-card px-3 py-2.5 [&_svg]:size-4 [&_svg]:text-muted-foreground">
      {icon}
      <div>
        <p className="text-sm font-medium">{name}</p>
        <p className="text-xs text-muted-foreground">{detail}</p>
      </div>
    </div>
  );
}

/**
 * Whether the canvas has room to lay the graph out across. It is the canvas
 * that is measured and not the window: in a page with a sidebar the two are
 * far apart.
 */
function useRoom(least: number) {
  const [wide, setWide] = useState(true);
  const watch = useCallback(
    (node: HTMLElement | null) => {
      if (!node) return;
      const observer = new ResizeObserver(([entry]) => setWide(entry.contentRect.width >= least));
      observer.observe(node);
      return () => observer.disconnect();
    },
    [least]
  );
  return [wide, watch] as const;
}

export default function FlowGroups() {
  const [wide, watch] = useRoom(720);
  // Side by side where there is room, and one under the other where there is not.
  const from = wide ? 'right' : 'bottom';
  const to = wide ? 'left' : 'top';

  return (
    // Taller where the groups are stacked, so they are not shrunk to fit.
    <div ref={watch} className={wide ? 'h-[28rem] w-full' : 'h-[36rem] w-full'}>
      <Flow
        // Fitted afresh when the layout changes.
        key={wide ? 'across' : 'down'}
        fitViewOnMount
        fitViewPadding={wide ? 48 : 24}
        label="Where a request goes"
        className="h-full rounded-none border-0"
      >
        <Flow.Background variant="dots" />
        <Flow.Group
          id="edge"
          label="Edge"
          position={{ x: 0, y: 0 }}
          className="flex flex-col gap-2"
        >
          <Service icon={<GlobeIcon />} name="Cache" detail="96 locations" />
          <Service icon={<ShieldCheckIcon />} name="Firewall" detail="Blocking 0.3%" />
        </Flow.Group>
        <Flow.Group
          id="core"
          label="Core"
          position={wide ? { x: 330, y: 130 } : { x: 70, y: 200 }}
          className="flex flex-col gap-2"
        >
          <Service icon={<ServerIcon />} name="Application" detail="Six instances" />
          <Service icon={<DatabaseIcon />} name="Database" detail="One primary, two copies" />
        </Flow.Group>
        <Flow.Group
          id="store"
          label="Storage"
          position={wide ? { x: 660, y: 0 } : { x: 0, y: 400 }}
          className="flex flex-col gap-2"
        >
          <Service icon={<HardDriveIcon />} name="Uploads" detail="2.1 TB" />
          <Service icon={<ArchiveIcon />} name="Backups" detail="Every six hours" />
        </Flow.Group>
        <Flow.Edge
          from="edge"
          to="core"
          variant="smoothstep"
          dashed
          arrow
          fromSide={from}
          toSide={to}
        />
        <Flow.Edge
          from="core"
          to="store"
          variant="smoothstep"
          dashed
          arrow
          fromSide={from}
          toSide={to}
        />
        <Flow.Controls position="top-left" lock={false} />
        {/* The map is for a graph too big to see at once, which on a narrow screen this is not. */}
        {wide ? <Flow.MiniMap position="bottom-right" /> : null}
      </Flow>
    </div>
  );
}