Deshacer, rehacer e historial

import { useEffect, useState } from 'react'
import { SuperSchedulerComponent } from 'super-scheduler'
import type { SchedulerHistoryChangeArgs, SuperScheduler } from 'super-scheduler'
import { createHistory } from 'super-scheduler/history'
import type { SchedulerHistory } from 'super-scheduler/history'
import 'super-scheduler/styles.css'

type HistoryState = Pick<
  SchedulerHistoryChangeArgs,
  'canUndo' | 'canRedo' | 'undoLabel' | 'redoLabel'
>

/** Mirrors the history in React: one render per change, never per gesture frame. */
export function useHistoryState(history: SchedulerHistory): HistoryState {
  const [state, setState] = useState<HistoryState>(() => ({
    canUndo: history.canUndo,
    canRedo: history.canRedo,
    undoLabel: history.undoLabel,
    redoLabel: history.redoLabel,
  }))
  useEffect(() => history.subscribe(setState), [history])
  return state
}

export function UndoablePlanner(props: {
  resources: SuperScheduler.ResourceData[]
  initialEvents: SuperScheduler.EventData[]
}) {
  // Created once: `history` is compared by identity, like every prop.
  const [history] = useState(() =>
    createHistory({
      limit: 100,
      // Default: moves and resizes. Mod+Z, Mod+Shift+Z and Ctrl+Y work while focus is in the grid.
      record: ['move', 'resize'],
      keys: 'root',
      labels: { move: 'move', resize: 'resize' },
    }),
  )
  const [initial] = useState(() => props.initialEvents.slice())
  const state = useHistoryState(history)

  return (
    <>
      <div role="toolbar" aria-label="History">
        <button type="button" disabled={!state.canUndo} onClick={() => history.undo()}>
          {state.undoLabel === null ? 'Undo' : `Undo ${state.undoLabel}`}
        </button>
        <button type="button" disabled={!state.canRedo} onClick={() => history.redo()}>
          {state.redoLabel === null ? 'Redo' : `Redo ${state.redoLabel}`}
        </button>
      </div>
      <SuperSchedulerComponent
        history={history}
        // Uncontrolled: the control owns the events after mount.
        defaultEvents={initial}
        resources={props.resources}
        startDate="2026-10-01"
        days={31}
        scale="Day"
      />
    </>
  )
}

import { useCallback, useMemo, useState } from 'react'
import { SuperScheduler, SuperSchedulerComponent } from 'super-scheduler'
import type { SchedulerEventsChangeArgs } from 'super-scheduler'
import { createHistory } from 'super-scheduler/history'
import type { HistoryOp } from 'super-scheduler/history'

type EventData = SuperScheduler.EventData

/** Applies history operations to React state. They arrive in order (reversed for undo). */
function applyOps(
  events: EventData[],
  ops: readonly HistoryOp[],
  direction: 'undo' | 'redo',
): EventData[] {
  let next = events
  for (const op of ops) {
    const target = direction === 'undo' ? op.before : op.after
    const id = (target ?? op.before ?? op.after)?.id
    if (id === undefined) continue
    const index = next.findIndex((event) => event.id === id)
    if (target === null) next = next.filter((event) => event.id !== id)
    else if (index >= 0) next = next.map((event, i) => (i === index ? target : event))
    else next = [...next, target]
  }
  return next
}

export function ControlledUndo(props: {
  resources: SuperScheduler.ResourceData[]
  initial: EventData[]
}) {
  const [events, setEvents] = useState(props.initial)
  // The control adopts the array it receives and mutates it: give it a copy.
  const owned = useMemo(() => events.slice(), [events])

  const [history] = useState(() =>
    createHistory({
      record: ['move', 'resize'],
      // Undo and redo update React state; the new `events` prop then reaches the control.
      apply: (ops, direction) => setEvents((current) => applyOps(current, ops, direction)),
    }),
  )

  const onEventsChange = useCallback(
    (args: SchedulerEventsChangeArgs) => setEvents([...args.events]),
    [],
  )

  const onTimeRangeSelected = useCallback(
    (args: SuperScheduler.SchedulerTimeRangeSelectedArgs) => {
      if (args.origin !== 'drag') return
      args.control.clearSelection()
      const booking: EventData = {
        id: SuperScheduler.guid(),
        resource: args.resource,
        start: args.start,
        end: args.end,
        text: 'New booking',
      }
      setEvents((current) => [...current, booking])
      // A change made through state is a data load for the control, not a gesture:
      // record it explicitly so it can be undone.
      history.record({
        kind: 'create',
        label: 'new booking',
        ops: [{ before: null, after: booking }],
      })
    },
    [history],
  )

  return (
    <SuperSchedulerComponent
      history={history}
      events={owned}
      onEventsChange={onEventsChange}
      onTimeRangeSelected={onTimeRangeSelected}
      resources={props.resources}
      startDate="2026-10-01"
      days={31}
      scale="Day"
    />
  )
}

import { useState } from 'react'
import { SuperSchedulerComponent, useSchedulerControl } from 'super-scheduler'
import type { SuperScheduler } from 'super-scheduler'
import { createHistory } from 'super-scheduler/history'

export function BulkEditing(props: {
  resources: SuperScheduler.ResourceData[]
  initial: SuperScheduler.EventData[]
}) {
  const { controlRef, control } = useSchedulerControl()
  const [initial] = useState(() => props.initial.slice())
  const [frozenDays, setFrozenDays] = useState<ReadonlySet<string>>(new Set())
  // 'update' also records changes made through control.events.update().
  const [history] = useState(() => createHistory({ record: ['move', 'resize', 'update'] }))

  // One undo step for the whole operation.
  const shiftSelected = (days: number) => {
    if (control === null) return
    const selected = control.multiselect.get()
    history.batch(`shift ${selected.length} jobs`, () => {
      for (const e of selected) {
        // A new object: the stored one stays intact as the state undo restores.
        // (The wrapper setters e.start(...) edit the stored object in place.)
        control.events.update({
          ...e.data,
          start: e.start().addDays(days),
          end: e.end().addDays(days),
        })
      }
    })
  }

  // A change outside the scheduler's events, undone through the same history.
  const freezeDay = (day: string) => {
    const add = () => setFrozenDays((current) => new Set(current).add(day))
    const remove = () =>
      setFrozenDays((current) => new Set([...current].filter((item) => item !== day)))
    add()
    history.push({ label: `freeze ${day}`, undo: remove, redo: add })
  }

  return (
    <>
      <button type="button" onClick={() => shiftSelected(1)}>
        Move selection one day later
      </button>
      <button type="button" onClick={() => freezeDay('2026-10-12')}>
        Freeze 12 October
      </button>
      <p>Frozen days: {[...frozenDays].join(', ') || 'none'}</p>
      <SuperSchedulerComponent
        controlRef={controlRef}
        history={history}
        defaultEvents={initial}
        eventClickHandling="Select"
        resources={props.resources}
        startDate="2026-10-01"
        days={31}
        scale="Day"
      />
    </>
  )
}

import { useCallback, useMemo, useState } from 'react'
import { SuperSchedulerComponent } from 'super-scheduler'
import type { SchedulerProps, SuperScheduler } from 'super-scheduler'
import { createHistory } from 'super-scheduler/history'

export function OptimisticPlanner(props: {
  resources: SuperScheduler.ResourceData[]
  initial: SuperScheduler.EventData[]
}) {
  const [events, setEvents] = useState(props.initial)
  const owned = useMemo(() => events.slice(), [events])
  const [history] = useState(() => createHistory())

  const config = useMemo<SchedulerProps>(
    () => ({
      history,
      onEventsChange: ({ events: next }) => setEvents([...next]),
      // The move is already applied and recorded: save it, and roll back if the server refuses.
      onEventMoved: (args) => {
        const id = args.e.id()
        saveBooking({
          id: String(id),
          resource: String(args.newResource),
          start: args.newStart.value,
          end: args.newEnd.value,
        }).catch(() => {
          // Restores the event's previous state and drops that history entry.
          history.revert(id)
          args.control.message('The move could not be saved and was undone.')
        })
      },
    }),
    [history],
  )

  const undo = useCallback(() => history.undo(), [history])

  return (
    <>
      <button type="button" onClick={undo}>
        Undo
      </button>
      <SuperSchedulerComponent
        {...config}
        events={owned}
        resources={props.resources}
        startDate="2026-10-01"
        days={31}
        scale="Day"
      />
    </>
  )
}