06bbde6e-cce6-4d3e-93bc-e64d75f8751b/research/base44/use-toast.md

// Inspired by react-hot-toast library import { useState, useEffect, createContext, useContext } from "react";

const TOAST_LIMIT = 20; const TOAST_REMOVE_DELAY = 1000000;

const actionTypes = { ADD_TOAST: "ADD_TOAST", UPDATE_TOAST: "UPDATE_TOAST", DISMISS_TOAST: "DISMISS_TOAST", REMOVE_TOAST: "REMOVE_TOAST", };

let count = 0;

function genId() { count = (count + 1) % Number.MAX_VALUE; return count.toString(); }

const toastTimeouts = new Map();

const addToRemoveQueue = (toastId) => { if (toastTimeouts.has(toastId)) { return; }

const timeout = setTimeout(() => { toastTimeouts.delete(toastId); dispatch({ type: actionTypes.REMOVE_TOAST, toastId, }); }, TOAST_REMOVE_DELAY);

toastTimeouts.set(toastId, timeout); };

const clearFromRemoveQueue = (toastId) => { const timeout = toastTimeouts.get(toastId); if (timeout) { clearTimeout(timeout); toastTimeouts.delete(toastId); } };

export const reducer = (state, action) => { switch (action.type) { case actionTypes.ADD_TOAST: return { ...state, toasts: [action.toast, ...state.toasts].slice(0, TOAST_LIMIT), };

case actionTypes.UPDATE_TOAST:
  return {
    ...state,
    toasts: state.toasts.map((t) =>
      t.id === action.toast.id ? { ...t, ...action.toast } : t
    ),
  };

case actionTypes.DISMISS_TOAST: {
  const { toastId } = action;

  // ! Side effects ! - This could be extracted into a dismissToast() action,
  // but I'll keep it here for simplicity
  if (toastId) {
    addToRemoveQueue(toastId);
  } else {
    state.toasts.forEach((toast) => {
      addToRemoveQueue(toast.id);
    });
  }

  return {
    ...state,
    toasts: state.toasts.map((t) =>
      t.id === toastId || toastId === undefined
        ? {
            ...t,
            open: false,
          }
        : t
    ),
  };
}
case actionTypes.REMOVE_TOAST:
  if (action.toastId === undefined) {
    return {
      ...state,
      toasts: [],
    };
  }
  return {
    ...state,
    toasts: state.toasts.filter((t) => t.id !== action.toastId),
  };

} };

const listeners = [];

let memoryState = { toasts: [] };

function dispatch(action) { memoryState = reducer(memoryState, action); listeners.forEach((listener) => { listener(memoryState); }); }

function toast({ ...props }) { const id = genId();

const update = (props) => dispatch({ type: actionTypes.UPDATE_TOAST, toast: { ...props, id }, });

const dismiss = () => dispatch({ type: actionTypes.DISMISS_TOAST, toastId: id });

dispatch({ type: actionTypes.ADD_TOAST, toast: { ...props, id, open: true, onOpenChange: (open) => { if (!open) dismiss(); }, }, });

return { id, dismiss, update, }; }

function useToast() { const [state, setState] = useState(memoryState);

useEffect(() => { listeners.push(setState); return () => { const index = listeners.indexOf(setState); if (index > -1) { listeners.splice(index, 1); } }; }, [state]);

return { ...state, toast, dismiss: (toastId) => dispatch({ type: actionTypes.DISMISS_TOAST, toastId }), }; }

export { useToast, toast };