Liquifact-frontend/components/ToastProvider.jsx at main · ogunjobielijah09-cyber/Liquifact-frontend · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
"use client";

import {
  createContext,
  useCallback,
  useContext,
  useEffect,
  useMemo,
  useRef,
  useState,
} from "react";

const ToastContext = createContext(null);
export { ToastContext };
const AUTO_DISMISS_MS = 5000;
// Keep the visible toast stack small so bursty errors do not cover the viewport.
const MAX_TOASTS = 3;
const VARIANT_STYLES = {
  success: {
    base: "border-emerald-500/30 bg-emerald-500/10 text-emerald-100",
    accent: "text-emerald-300",
    icon: "✅",
    label: "Success",
  },
  error: {
    base: "border-red-500/30 bg-red-500/10 text-red-100",
    accent: "text-red-300",
    icon: "❌",
    label: "Error",
  },
  info: {
    base: "border-cyan-500/20 bg-cyan-500/10 text-cyan-100",
    accent: "text-cyan-300",
    icon: "ℹ️",
    label: "Info",
  },
};

function getToastKey({ variant = "info", title, message }) {
  return `${variant}::${title || ""}::${message || ""}`;
}

function createToast({ variant = "info", title, message }) {
  return {
    id: `${Date.now()}-${Math.random().toString(16).slice(2)}`,
    variant,
    title: title || VARIANT_STYLES[variant]?.label || "Notice",
    message,
    key: getToastKey({ variant, title, message }),
    autoDismiss: true,
  };
}

function canReceiveFocus(el) {
  return (
    el instanceof HTMLElement &&
    typeof el.focus === "function" &&
    !el.hasAttribute("disabled") &&
    el.isConnected
  );
}

function restoreFocusTo(el) {
  if (!canReceiveFocus(el)) return;
  queueMicrotask(() => {
    if (canReceiveFocus(el)) {
      el.focus();
    }
  });
}

export function ToastProvider({ children }) {
  const [toasts, setToasts] = useState([]);
  const timers = useRef(new Map());
  // Tracks the element that was focused before the user moved focus into a toast.
  // Used to restore focus after a toast is dismissed via keyboard so focus does not
  // fall back to <body> (which would lose the user's place in the page).
  const preDismissFocusRef = useRef(null);
  // Ref to the toast container so we can detect focus moving outside it.
  const containerRef = useRef(null);
  // Captures document.activeElement at the moment addToast is called. This is the
  // fallback for document-level Escape handling, where focus never enters the toast
  // (so onFocus never fires to populate preDismissFocusRef).
  const addTimeFocusRef = useRef(null);

  const clearToastTimer = useCallback((id) => {
    const timeout = timers.current.get(id);
    if (timeout) {
      clearTimeout(timeout);
      timers.current.delete(id);
    }
  }, []);

  const removeToast = useCallback(
    (id) => {
      setToasts((current) => current.filter((toast) => toast.id !== id));
      clearToastTimer(id);
    },
    [clearToastTimer]
  );

  const scheduleToastTimer = useCallback(
    (id) => {
      clearToastTimer(id);
      const timeout = setTimeout(() => removeToast(id), AUTO_DISMISS_MS);
      timers.current.set(id, timeout);
    },
    [clearToastTimer, removeToast]
  );

  const addToast = useCallback(
    ({ variant, title, message }) => {
      // Snapshot the currently focused element so document-level Escape can
      // restore focus even when the toast never receives focus directly.
      const activeEl = document.activeElement;
      if (activeEl && activeEl !== document.body && canReceiveFocus(activeEl)) {
        addTimeFocusRef.current = activeEl;
      }

      const nextToast = createToast({ variant, title, message });
      const key = nextToast.key;
      let timerAction = null;

      setToasts((current) => {
        const existingIndex = current.findIndex((toast) => toast.key === key);

        if (existingIndex !== -1) {
          const existingToast = current[existingIndex];
          timerAction = { type: "refresh", id: existingToast.id };
          // Bump the existing toast to the front (newest position) so
          // re-triggered messages appear at the top of the stack.
          if (existingIndex === 0) return current;
          return [
            existingToast,
            ...current.slice(0, existingIndex),
            ...current.slice(existingIndex + 1),
          ];
        }

        if (current.length >= MAX_TOASTS) {
          timerAction = {
            type: "replace",
            removedId: current[current.length - 1].id,
            id: nextToast.id,
          };
          const next = [nextToast, ...current.slice(0, MAX_TOASTS - 1)];
          return next;
        }

        timerAction = { type: "add", id: nextToast.id };
        return [nextToast, ...current];
      });

      if (timerAction?.type === "refresh") {
        scheduleToastTimer(timerAction.id);
        return;
      }

      if (timerAction?.type === "replace") {
        clearToastTimer(timerAction.removedId);
        scheduleToastTimer(timerAction.id);
        return;
      }

      if (timerAction?.type === "add") {
        scheduleToastTimer(timerAction.id);
      }
    },
    [clearToastTimer, scheduleToastTimer]
  );

  // Pause auto-dismiss — used by both mouseenter (pointer) and focus (keyboard).
  const pauseToast = useCallback(
    (id) => {
      clearToastTimer(id);
    },
    [clearToastTimer]
  );

  // Resume auto-dismiss — used by both mouseleave (pointer) and blur (keyboard).
  const resumeToast = useCallback(
    (id) => {
      if (timers.current.has(id)) {
        return;
      }
      setToasts((current) => {
        const toastExists = current.some((toast) => toast.id === id);
        if (!toastExists) return current;
        scheduleToastTimer(id);
        return current;
      });
    },
    [scheduleToastTimer]
  );

  // Dismiss the toast and return focus to the element that was active before the
  // user tabbed into the toast region. This prevents focus from falling to <body>.
  // Falls back to the element captured at addToast time for document-level Escape.
  const dismissAndReturnFocus = useCallback(
    (id) => {
      const target = preDismissFocusRef.current || addTimeFocusRef.current;
      removeToast(id);
      // Restore focus after React has removed the toast from the DOM.
      if (target && typeof target.focus === "function") {
        // Use setTimeout(0) so the DOM has settled before we re-focus.
        setTimeout(() => target.focus(), 0);
      }
    },
    [removeToast]
  );

  // Document-level Escape listener so that pressing Escape dismisses the most
  // recent toast regardless of where focus is (e.g. still on a trigger button or
  // an unrelated input). The per-toast onKeyDown handles the case where the toast
  // card itself is focused.
  useEffect(() => {
    if (toasts.length === 0) return;

    const handleKeyDown = (e) => {
      if (e.key !== "Escape") return;
      // Let the per-toast onKeyDown handle it when focus is inside the toast region.
      if (containerRef.current?.contains(e.target)) return;
      e.preventDefault();
      const mostRecent = toasts[0];
      if (mostRecent) {
        dismissAndReturnFocus(mostRecent.id);
      }
    };

    document.addEventListener("keydown", handleKeyDown);
    return () => document.removeEventListener("keydown", handleKeyDown);
  }, [toasts, dismissAndReturnFocus]);

  useEffect(() => {
    const currentTimers = timers.current;
    return () => {
      currentTimers.forEach((timeout) => clearTimeout(timeout));
      currentTimers.clear();
    };
  }, []);

  const value = useMemo(
    () => ({
      success: (message, title) => addToast({ variant: "success", title, message }),
      error: (message, title) => addToast({ variant: "error", title, message }),
      info: (message, title) => addToast({ variant: "info", title, message }),
    }),
    [addToast]
  );

  return (
    <ToastContext.Provider value={value}>
      {children}

      <div
        aria-live="polite"
        role="status"
        ref={containerRef}
        className="pointer-events-none fixed inset-x-0 bottom-4 z-50 flex justify-center px-4 sm:justify-end sm:px-6"
      >
        <div className="flex w-full max-w-md flex-col gap-3">
          {toasts.map((toast) => {
            const variant = VARIANT_STYLES[toast.variant] || VARIANT_STYLES.info;

            return (
              <div
                key={toast.id}
                // tabIndex={0} makes the card itself focusable so keyboard users can
                // reach it via Tab and then use Escape to dismiss without having to
                // navigate to the Close button first.
                tabIndex={0}
                onMouseEnter={() => pauseToast(toast.id)}
                onMouseLeave={() => resumeToast(toast.id)}
                // Mirror hover pause/resume for keyboard users: focusing the card (or
                // any element inside it) pauses the timer; blurring resumes it.
                onFocus={(e) => {
                  // Record the previously-focused element the first time focus enters
                  // this toast so we can restore it on dismissal.
                  if (!containerRef.current?.contains(e.relatedTarget)) {
                    preDismissFocusRef.current = e.relatedTarget;
                  }
                  pauseToast(toast.id);
                }}
                onBlur={(e) => {
                  // Only resume if focus has left this toast entirely (not just moved
                  // between the card and its Close button).
                  if (!containerRef.current?.contains(e.relatedTarget)) {
                    resumeToast(toast.id);
                  }
                }}
                // Escape dismisses the currently-focused toast, matching common dialog
                // and menu patterns so keyboard users have a single consistent shortcut.
                onKeyDown={(e) => {
                  if (e.key === "Escape") {
                    e.preventDefault();
                    dismissAndReturnFocus(toast.id);
                  }
                }}
                className={`pointer-events-auto overflow-hidden rounded-3xl border p-4 shadow-2xl shadow-slate-950/30 transition duration-200 ${variant.base}`}
              >
                <div className="flex items-start gap-3">
                  <div className="mt-0.5 text-xl" aria-hidden="true">
                    {variant.icon}
                  </div>
                  <div className="min-w-0 flex-1">
                    <p className="text-sm font-semibold text-slate-100">{toast.title}</p>
                    <p className="mt-1 text-sm leading-6 text-slate-300">{toast.message}</p>
                  </div>
                  <button
                    type="button"
                    className="rounded-full border border-slate-700/80 bg-slate-950/70 px-2.5 py-1 text-xs font-semibold text-slate-100 outline-none transition duration-150 hover:bg-slate-900 focus-visible:ring-2 focus-visible:ring-cyan-400"
                    aria-label="Dismiss notification"
                    onClick={() => dismissAndReturnFocus(toast.id)}
                  >
                    Close
                  </button>
                </div>
              </div>
            );
          })}
        </div>
      </div>
    </ToastContext.Provider>
  );
}

export function useToast() {
  const context = useContext(ToastContext);
  if (!context) {
    throw new Error("useToast must be used within a ToastProvider");
  }
  return context;
}