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// Inspired by react-hot-toast library
import * as React from "react"
import type {
ToastActionElement,
ToastProps,
} from "@/components/ui/toast"
const TOAST_LIMIT = 1
const TOAST_REMOVE_DELAY = 1000000
type ToasterToast = ToastProps & {
id: string
title?: React.ReactNode
description?: React.ReactNode
action?: ToastActionElement
}
const actionTypes = {
ADD_TOAST: "ADD_TOAST",
UPDATE_TOAST: "UPDATE_TOAST",
DISMISS_TOAST: "DISMISS_TOAST",
REMOVE_TOAST: "REMOVE_TOAST",
} as const
let count = 0
function genId() {
count = (count + 1) % Number.MAX_VALUE
return count.toString()
}
type ActionType = typeof actionTypes
type Action =
| {
type: ActionType["ADD_TOAST"]
toast: ToasterToast
}
| {
type: ActionType["UPDATE_TOAST"]
toast: Partial<ToasterToast>
}
| {
type: ActionType["DISMISS_TOAST"]
toastId?: ToasterToast["id"]
}
| {
type: ActionType["REMOVE_TOAST"]
toastId?: ToasterToast["id"]
}
interface State {
toasts: ToasterToast[]
}
const toastTimeouts = new Map<string, ReturnType<typeof setTimeout>>()
const addToRemoveQueue = (toastId: string) => {
if (toastTimeouts.has(toastId)) {
return
}
const timeout = setTimeout(() => {
toastTimeouts.delete(toastId)
dispatch({
type: "REMOVE_TOAST",
toastId: toastId,
})
}, TOAST_REMOVE_DELAY)
toastTimeouts.set(toastId, timeout)
}
export const reducer = (state: State, action: Action): State => {
switch (action.type) {
case "ADD_TOAST":
return {
...state,
toasts: [action.toast, ...state.toasts].slice(0, TOAST_LIMIT),
}
case "UPDATE_TOAST":
return {
...state,
toasts: state.toasts.map((t) =>
t.id === action.toast.id ? { ...t, ...action.toast } : t
),
}
case "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 "REMOVE_TOAST":
if (action.toastId === undefined) {
return {
...state,
toasts: [],
}
}
return {
...state,
toasts: state.toasts.filter((t) => t.id !== action.toastId),
}
}
}
const listeners: Array<(state: State) => void> = []
let memoryState: State = { toasts: [] }
function dispatch(action: Action) {
memoryState = reducer(memoryState, action)
listeners.forEach((listener) => {
listener(memoryState)
})
}
type Toast = Omit<ToasterToast, "id">
function toast({ ...props }: Toast) {
const id = genId()
const update = (props: ToasterToast) =>
dispatch({
type: "UPDATE_TOAST",
toast: { ...props, id },
})
const dismiss = () => dispatch({ type: "DISMISS_TOAST", toastId: id })
dispatch({
type: "ADD_TOAST",
toast: {
...props,
id,
open: true,
onOpenChange: (open) => {
if (!open) dismiss()
},
},
})
return {
id: id,
dismiss,
update,
}
}
function useToast() {
const [state, setState] = React.useState<State>(memoryState)
React.useEffect(() => {
listeners.push(setState)
return () => {
const index = listeners.indexOf(setState)
if (index > -1) {
listeners.splice(index, 1)
}
}
}, [state])
return {
...state,
toast,
dismiss: (toastId?: string) => dispatch({ type: "DISMISS_TOAST", toastId }),
}
}
export { useToast, toast }
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