# All files / snackbar ToastManager.tsx

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     import { nanoid } from "nanoid";
    import { type ConfigurableToastProps } from "./Toast.js";

    /**
     * @remarks \@since 6.0.0
     */
    export const DEFAULT_TOAST_VISIBLE_TIME = 5000;

    /**
     * - `"normal"` - the toast will be added to the end of the queue
     * - `"next"` - the toast will be inserted next-in-line in the queue, waiting
     *   for the current visible toast to exit before being shown. If the toast does
     *   not support duplicates, the existing toast will be moved instead and merged
     *   with the toast.
     * - `"replace"` - if there is a currently visible toast, it will start the
     *   leave transition and display the newly added toast instead.
     * - `"immediate"` - the same behavior as `"replace"` except that if there was a
     *   currently visible toast, it will be shown once the newly added toast again.
     *
     * @remarks \@since 6.0.0 Renamed from `MessagePriority` to `ToastPriority`
     */
    export type ToastPriority = "normal" | "next" | "replace" | "immediate";

    /**
     * - `"allow"` - toasts with the same `toastId` can be added into the queue, but
     *   the leave timeout behavior might not work if multiple toasts can be shown
     *   at the same time.
     * - `"restart"` - (default) toasts that have the same `toastId` as a toast
     *   being shown will restart the exit timeout and update the toast with any
     *   differences in the toast. If the toast is not currently being shown, a new
     *   toast will not be added.
     * - `"update"` - toasts that have the same `toastId` will just update the toast
     *   with the latest content while maintaining any existing timeouts
     *
     * @remarks \@since 6.0.0 Renamed from `DuplicateBehavior`
     */
    export type ToastDuplicateBehavior = "allow" | "restart" | "update";

    /**
     * @remarks \@since 6.0.0
     */
    export interface ToastMeta {
      /**
       * This will be `true` if the exit timeout has been paused either by hovering
       * the toast or the page has become inactive through blur or minimizing.
       */
      paused: boolean;

      /**
       * This will be `true` when the toast should be visible and `false` during the
       * exit animation.
       */
      visible: boolean;

      /**
       * The current toast's id which can be used with the:
       * - {@link ToastManager.removeToast}
       * - {@link ToastManager.startRemoveTimeout}
       * - {@link ToastManager.pauseRemoveTimeout}
       * - {@link ToastManager.resumeRemoveTimeout}
       */
      toastId: string;
      priority: ToastPriority;
      duplicates: ToastDuplicateBehavior;
      visibleTime: number | null;
    }

    /**
     * @remarks \@since 6.0.0
     */
    export interface CreateToastOptions extends ConfigurableToastProps {
      /**
       * @defaultValue `nanoid()`
       */
      toastId?: string;

      /**
       * @see {@link ToastDuplicateBehavior}
       * @defaultValue `"restart"`
       */
      duplicates?: ToastDuplicateBehavior;

      /**
       * @see {@link ToastPriority}
       * @defaultValue `"normal"`
       */
      priority?: ToastPriority;

      /**
       * Set this to `null` to prevent the toast from automatically hiding,
       * otherwise set this to the number of milliseconds to remain visible.
       *
       * @see {@link DEFAULT_TOAST_VISIBLE_TIME}
       * @defaultValue `DEFAULT_TOAST_VISIBLE_TIME`
       */
      visibleTime?: number | null;
    }

    /**
     * @remarks \@since 6.0.0
     */
    export interface QueuedToast extends ConfigurableToastProps, ToastMeta {}

    /**
     * @remarks \@since 6.0.0
     */
    export type ToastQueue = readonly Readonly<QueuedToast>[];

    /**
     * @remarks \@since 6.0.0
     */
    export type ToastCallback = (queue: ToastQueue) => void;

    /**
     * @internal
     * @remarks \@since 6.0.0
     */
    export interface ToastVisibilityTimers {
      inactive: boolean;
      startTime: number;
      elapsedTime: number;
      exitTimeout?: number;
    }

    /**
     * @see {@link ToastManagerProvider}
     *
     * @remarks \@since 6.0.0
     */
    export class ToastManager {
      #queue: QueuedToast[];
      #timers: Map<string, ToastVisibilityTimers>;
      #listeners: ToastCallback[];

      constructor() {
        this.#queue = [];
        this.#timers = new Map();
        this.#listeners = [];

        // All of the class methods must be arrow functions to preserve the correct
        // `this` value. If they aren't arrow functions, I'd have to wrap each call
        // in an arrow function to work.
        //
        // i.e.
        // useSyncExternalStore(
        //   (cb) => manager.subscribe(cb),
        //   () => manager.getQueue(),
        //   () => manager.getQueue(),
        // );
      }

      #emit = (): void => {
        // shallow clone to ensure react updates
        this.#queue = [...this.#queue];
        this.#listeners.forEach((callback) => {
          callback(this.#queue);
        });
      };

      #getToastIndex = (toastId: string | undefined): number => {
        if (!toastId) {
          return -1;
        }

        return this.#queue.findIndex((toast) => toast.toastId === toastId);
      };

      #getToast = (toastId: string | undefined): QueuedToast | undefined => {
        return this.#queue[this.#getToastIndex(toastId)];
      };

      /**
       * Starts the exit transition for the currently shown toast and adds the next
       * toast into the queue. This requires a manual call to `this.#emit()`
       * afterwards.
       */
      #addToastImmediately = (nextToast: QueuedToast): void => {
        const [current] = this.#queue;
        this.clearTimer(current.toastId);
        this.#queue[0] = {
          ...current,
          visible: false,
        };
        if (nextToast.priority === "immediate") {
          this.#queue.splice(1, 0, nextToast, current);
        } else {
          this.#queue.splice(1, 0, nextToast);
        }
      };

      /**
       * This calls `this.#emit()` if the toast was updated
       */
      #updateToast = (
        toastIdOrIndex: string | number,
        patch: Partial<QueuedToast>
      ): void => {
        const index =
          typeof toastIdOrIndex === "number"
            ? toastIdOrIndex
            : this.#getToastIndex(toastIdOrIndex);

        if (index === -1) {
          return;
        }

        this.#queue[index] = {
          ...this.#queue[index],
          ...patch,
        };
        this.#emit();
      };

      /**
       * This is just used to subscribe to changes in the {@link useToastQueue}.
       *
       * ```tsx
       * useSyncExternalStore(
       *   toastManager.subscribe,
       *   toastManager.getQueue,
       *   toastManager.getQueue,
       * );
       * ```
       *
       * @internal
       */
      subscribe = (callback: ToastCallback): (() => void) => {
        this.#listeners.push(callback);

        return () => {
          this.#listeners = this.#listeners.filter((cb) => cb !== callback);
        };
      };

      /**
       * @see {@link subscribe}
       * @internal
       */
      getQueue = (): ToastQueue => {
        return this.#queue;
      };

      /**
       * Either adds the toast to the queue or updates an existing toast when using
       * an existing `toastId`.
       *
       * @example
       * Adding toasts
       * ```tsx
       * // create a toast when the user is offline that will not disappear
       * addToast({ toastId: "offline", visibleTime: null });
       *
       * // add a new toast that displays `"Toast"` to the queue
       * addToast({ children: "Toast!" });
       *
       * // add an online toast notification. since these three use the same toast
       * // id, the hide timer will be reset each time
       * addToast({ toastId: "online" });
       * addToast({ toastId: "online" });
       * addToast({ toastId: "online" });
       *
       * // add a server error toast to the queue where the second one will be
       * // ignored
       * addToast({
       *   toastId: "ServerError",
       *   theme: "error",
       *   duplicates: "prevent",
       * });
       * addToast({
       *   toastId: "ServerError",
       *   theme: "error",
       *   duplicates: "prevent",
       * });
       *
       * // add a toast to the queue that has an action button that says "Goodbye"
       * addToast({
       *   children: "Hello, world!",
       *   action: "Goodbye",
       * });
       *
       * // add a toast to the queue that has an action button that says "Goodbye"
       * // and a custom click handler
       * addToast({
       *   children: "Hello, world!",
       *   action: {
       *     onClick: () => {
       *       logout();
       *     },
       *     children: "Goodbye",
       *   },
       * });
       *
       * // add a toast to the queue that renders a react component in the content,
       * // a custom action button implementation (using `ToastActionButton`), and a
       * // close button
       * addToast({
       *   children: <SomeCustomComponent />,
       *   actionButton: <SomeCustomActionButton />,
       *   closeButton: true,
       * });
       * ```
       */
      addToast = (toast: CreateToastOptions): void => {
        const {
          toastId = nanoid(),
          visibleTime = DEFAULT_TOAST_VISIBLE_TIME,
          role = visibleTime === null ? "alert" : "status",
          priority = "normal",
          duplicates = "restart",
        } = toast;

        const existingIndex = this.#getToastIndex(toast.toastId);
        if (existingIndex !== -1 && duplicates !== "allow") {
          const existingToast = this.#queue[existingIndex];

          // reorder/move the existing toast to be the next item in the queue by:
          // - removing the toast from the queue
          // - inserting it into the next position with the updates
          if (priority === "next" && existingIndex > 1) {
            this.#queue.splice(existingIndex, 1);
            this.#queue.splice(1, 0, { ...existingToast, ...toast });
            this.#emit();
            return;
          }

          // only need to reorder the queue if it is not being shown
          if (
            (priority === "replace" || priority === "immediate") &&
            existingIndex !== 0
          ) {
            this.#queue.splice(existingIndex, 1);
            this.#addToastImmediately({
              ...existingToast,
              ...toast,
            });
            this.#emit();
            return;
          }

          const timers = this.#timers.get(toastId);
          if (existingToast.visible && duplicates === "restart" && timers) {
            this.#timers.set(toastId, { ...timers, elapsedTime: 0 });
            this.startRemoveTimeout(toastId);
          }

          this.#updateToast(existingIndex, toast);
          return;
        }

        const nextToast: QueuedToast = {
          ...toast,
          role,
          paused: false,
          visible: true,
          toastId,
          priority,
          duplicates,
          visibleTime,
        };

        const queueSize = this.#queue.length;
        if (priority === "next" && queueSize > 1) {
          this.#queue.splice(1, 0, nextToast);
        } else if (
          (priority === "replace" || priority === "immediate") &&
          queueSize > 0
        ) {
          this.#addToastImmediately(nextToast);
        } else {
          this.#queue.push(nextToast);
        }

        this.#emit();
      };

      /**
       * Attempts to start the timeout for removing the toast when the `visibleTime`
       * is not null for a toast.
       *
       * @param toastId - The specific toastId to update
       */
      startRemoveTimeout = (toastId: string): void => {
        const toast = this.#getToast(toastId);
        if (!toast) {
          return;
        }

        const { visibleTime } = toast;
        if (visibleTime === null) {
          // Must manually be closed
          return;
        }

        const cached = this.#timers.get(toastId);
        const timers = (cached && { ...cached }) || {
          inactive: false,
          startTime: Date.now(),
          elapsedTime: 0,
        };
        window.clearTimeout(timers.exitTimeout);

        let duration = visibleTime;
        if (timers.elapsedTime) {
          duration -= timers.elapsedTime;
        }

        timers.inactive = false;
        timers.exitTimeout = window.setTimeout(() => {
          this.removeToast(toastId, true);
        }, duration);
        this.#timers.set(toastId, timers);
      };

      /**
       * Pauses the remove timeout for a specific toast normally with hover events
       * or the browser becoming inactive.
       *
       * @param toastId - The specific toastId to pause
       */
      pauseRemoveTimeout = (toastId: string): void => {
        const toast = this.#getToast(toastId);
        const cached = this.#timers.get(toastId);
        if (!toast || !cached || cached.inactive) {
          return;
        }

        window.clearTimeout(cached.exitTimeout);
        const timers = { ...cached };
        timers.inactive = true;
        timers.elapsedTime = Date.now() - timers.startTime + timers.elapsedTime;
        this.#timers.set(toastId, timers);
        this.#updateToast(toastId, { paused: true });
      };

      /**
       * Resumes the current remove timeout if it was paused by
       * {@link pauseRemoveTimeout}.
       *
       * @param toastId - The specific toastId to resume
       */
      resumeRemoveTimeout = (toastId: string): void => {
        const toastIndex = this.#getToastIndex(toastId);
        const timers = this.#timers.get(toastId);
        if (toastIndex === -1 || !timers?.startTime) {
          return;
        }

        this.#updateToast(toastIndex, { paused: false });
        this.startRemoveTimeout(toastId);
      };

      /**
       * Removes a toast by id from the queue without any exit animation.
       *
       * @param toastId - The specific {@link QueuedToast.toastId}
       * @param transition - Set this to `true` to remove the toast by the exit
       * transition instead of immediately.
       */
      removeToast = (toastId: string, transition: boolean): void => {
        const toastIndex = this.#getToastIndex(toastId);
        if (toastIndex === -1) {
          return;
        }

        if (transition) {
          this.clearTimer(toastId);
          this.#updateToast(toastIndex, { visible: false });
          return;
        }

        this.#queue.splice(toastIndex, 1);
        this.#emit();
      };

      /**
       * Clears any pending timers for the provided toast id. This should generally
       * be used in the `useEffect` cleanup effect for any custom toast renderer
       * implementations.
       *
       * @example
       * ```tsx
       * const { toastId } = toast;
       * const toastManager = useToastManager();
       *
       * useEffect(() => {
       *   return () => {
       *     toastManager.clearTimer(toastId):
       *   }
       * }, [toastManager, toastId]);
       * ```
       */
      clearTimer = (toastId: string): void => {
        const timer = this.#timers.get(toastId);
        window.clearTimeout(timer?.exitTimeout);
        this.#timers.delete(toastId);
      };

      /**
       * Removes first toast from the queue without any exit animation. You most
       * likely want to use {@link removeToast} instead.
       */
      popToast = (): void => {
        this.#queue.pop();
        this.#emit();
      };

      /**
       * Removes all toasts from the queue. There will be no exit animation.
       *
       * @param disableEmit - Set this to `true` to disable emitting the empty queue.
       * Mostly used for tests.
       */
      clearToasts = (disableEmit = false): void => {
        this.#queue = [];
        this.#timers.forEach((meta) => {
          window.clearTimeout(meta.exitTimeout);
        });
        this.#timers.clear();
        if (!disableEmit) {
          this.#emit();
        }
      };
    }

    /**
     * The default toast manager for react-md apps that will allow toasts to be
     * added without setting up the {@link ToastManagerProvider}.
     *
     * @internal
     * @remarks \@since 6.0.0
     */
    export const toastManager = new ToastManager();

    /**
     * @see {@link ToastManager.addToast}
     * @remarks \@since 6.0.0
     */
    export const addToast: ToastManager["addToast"] = (toast) =>
      toastManager.addToast(toast);

    /**
     * @see {@link ToastManager.startRemoveTimeout}
     * @remarks \@since 6.0.0
     */
    export const startRemoveToastTimeout: ToastManager["startRemoveTimeout"] = (
      toastId
    ) => toastManager.startRemoveTimeout(toastId);

    /**
     * @see {@link ToastManager.popToast}
     * @remarks \@since 6.0.0
     */
    export const popToast: ToastManager["popToast"] = () => toastManager.popToast();

    /**
     * @see {@link ToastManager.removeToast}
     * @remarks \@since 6.0.0
     */
    export const removeToast: ToastManager["removeToast"] = (toastId, transition) =>
      toastManager.removeToast(toastId, transition);

    /**
     * @see {@link ToastManager.clearToasts}
     * @remarks \@since 6.0.0
     */
    export const clearToasts = (): void => toastManager.clearToasts();