Octane Example: UseQueuedState

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import { createRoot } from 'octane'
import { useQueuedState } from '@tanstack/octane-pacer/queuer'
import { useState } from 'octane'

function App1() {
  // Queuer that uses Octane.useState under the hood
  function processItem(item: number) {
    console.log('processing item', item)
  }

  const [queueItems, addItem, queuer] = useQueuedState(
    processItem,
    {
      maxSize: 25,
      initialItems: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
      started: false,
      wait: 1000, // wait 1 second between processing items - wait is optional!
    },
    (state) => ({ items: state.items }),
  )

  return (
    <div>
      <h1>{'TanStack Pacer useQueuedState Example 1'}</h1>
      <queuer.Subscribe
        selector={(state) => ({
          size: state.size,
          isFull: state.isFull,
          isEmpty: state.isEmpty,
          isIdle: state.isIdle,
          status: state.status,
          executionCount: state.executionCount,
          isRunning: state.isRunning,
        })}
      >
        {({
          size,
          isFull,
          isEmpty,
          isIdle,
          status,
          executionCount,
          isRunning,
        }) => (
          <>
            <div>
              {'Queue Size: '}
              {size}
            </div>
            <div>
              {'Queue Max Size: '}
              {25}
            </div>
            <div>
              {'Queue Full: '}
              {isFull ? 'Yes' : 'No'}
            </div>
            <div>
              {'Queue Peek: '}
              {queuer.peekNextItem()}
            </div>
            <div>
              {'Queue Empty: '}
              {isEmpty ? 'Yes' : 'No'}
            </div>
            <div>
              {'Queue Idle: '}
              {isIdle ? 'Yes' : 'No'}
            </div>
            <div>
              {'Queuer Status: '}
              {status}
            </div>
            <div>
              {'Items Processed: '}
              {executionCount}
            </div>
            <div>
              {'Queue Items: '}
              {queueItems.join(', ')}
            </div>
            <div
              style={{
                display: 'grid',
                gridTemplateColumns: 'repeat(2, 1fr)',
                gap: '8px',
                maxWidth: '600px',
                margin: '16px 0',
              }}
            >
              <button
                onClick={() => {
                  const nextNumber = queueItems.length
                    ? queueItems[queueItems.length - 1]! + 1
                    : 1
                  addItem(nextNumber)
                }}
                disabled={isFull}
              >
                {'Add Number'}
              </button>
              <button
                disabled={isEmpty}
                onClick={() => {
                  queuer.execute()
                }}
              >
                {'Process Next'}
              </button>
              <button onClick={() => queuer.clear()} disabled={isEmpty}>
                {'Clear Queue'}
              </button>
              <button onClick={() => queuer.reset()} disabled={isEmpty}>
                {'Reset Queue'}
              </button>
              <button onClick={() => queuer.start()} disabled={isRunning}>
                {'Start Processing'}
              </button>
              <button onClick={() => queuer.stop()} disabled={!isRunning}>
                {'Stop Processing'}
              </button>
            </div>
          </>
        )}
      </queuer.Subscribe>
      <queuer.Subscribe selector={(state) => state}>
        {(state) => (
          <pre style={{ marginTop: '20px' }}>
            {JSON.stringify(state, null, 2)}
          </pre>
        )}
      </queuer.Subscribe>
    </div>
  )
}

function App2() {
  const [currentValue, setCurrentValue] = useState(50)
  const [queuedValue, setQueuedValue] = useState(50)
  const [submittedCount, setSubmittedCount] = useState(0)

  // Queuer that processes a single value with delays
  const [, addItem, queuer] = useQueuedState(
    (item: number) => {
      setQueuedValue(item)
    },
    {
      maxSize: 100,
      started: true,
      wait: 100,
    },
    // Alternative to queuer.Subscribe: pass a selector as 3rd arg to cause re-renders and subscribe to state
    // (state) => state,
  )

  function handleRangeChange(e: Event & { currentTarget: HTMLInputElement }) {
    const newValue = parseInt(e.currentTarget.value, 10)
    setCurrentValue(newValue)
    setSubmittedCount((c) => c + 1)
    addItem(newValue)
  }

  return (
    <div>
      <h1>{'TanStack Pacer useQueuedState Example 2'}</h1>
      <div style={{ marginBottom: '20px' }}>
        <label>
          {'Current Range:'}
          <input
            type="range"
            min="0"
            max="100"
            value={currentValue}
            onInput={handleRangeChange}
            style={{ width: '100%' }}
          />
          <span>{currentValue}</span>
        </label>
      </div>
      <div style={{ marginBottom: '20px' }}>
        <label>
          {'Queued Range (Readonly):'}
          <input
            type="range"
            min="0"
            max="100"
            value={queuedValue}
            disabled
            style={{ width: '100%' }}
          />
          <span>{queuedValue}</span>
        </label>
      </div>
      <table>
        <tbody>
          <queuer.Subscribe
            selector={(state) => ({
              size: state.size,
              isFull: state.isFull,
              isEmpty: state.isEmpty,
              isIdle: state.isIdle,
              status: state.status,
              executionCount: state.executionCount,
            })}
          >
            {({ size, isFull, isEmpty, isIdle, status, executionCount }) => (
              <>
                <tr>
                  <td>{'Queue Size:'}</td>
                  <td>{size}</td>
                </tr>
                <tr>
                  <td>{'Queue Full:'}</td>
                  <td>{isFull ? 'Yes' : 'No'}</td>
                </tr>
                <tr>
                  <td>{'Queue Empty:'}</td>
                  <td>{isEmpty ? 'Yes' : 'No'}</td>
                </tr>
                <tr>
                  <td>{'Queue Idle:'}</td>
                  <td>{isIdle ? 'Yes' : 'No'}</td>
                </tr>
                <tr>
                  <td>{'Queuer Status:'}</td>
                  <td>{status}</td>
                </tr>
                <tr>
                  <td>{'Values Submitted:'}</td>
                  <td>{submittedCount}</td>
                </tr>
                <tr>
                  <td>{'Items Processed:'}</td>
                  <td>{executionCount}</td>
                </tr>
                <tr>
                  <td>{'Pending Items:'}</td>
                  <td>{size}</td>
                </tr>
              </>
            )}
          </queuer.Subscribe>
        </tbody>
      </table>
      <div style={{ color: '#666', fontSize: '0.9em' }}>
        <p>{'Queued with 100ms wait time'}</p>
      </div>
      <queuer.Subscribe selector={(state) => state}>
        {(state) => (
          <pre style={{ marginTop: '20px' }}>
            {JSON.stringify(state, null, 2)}
          </pre>
        )}
      </queuer.Subscribe>
    </div>
  )
}

function PacerExample() {
  return (
    <div>
      <App1 />
      <hr />
      <App2 />
    </div>
  )
}
createRoot(document.getElementById('app')!).render(PacerExample)