first commit

app/lib/utils.ts

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+export function formatTime(ms: number) {
+  const abs = Math.abs(ms);
+  const totalSeconds = Math.floor(abs / 1000);
+  const hours = Math.floor(totalSeconds / 3600);
+  const minutes = Math.floor((totalSeconds % 3600) / 60);
+  const seconds = totalSeconds % 60;
+  const milliseconds = Math.floor(abs % 1000);
+
+  return {
+    hours: hours.toString().padStart(2, "0"),
+    minutes: minutes.toString().padStart(2, "0"),
+    seconds: seconds.toString().padStart(2, "0"),
+    milliseconds: milliseconds.toString().padStart(3, "0"),
+    full: `${hours.toString().padStart(2, "0")}:${minutes.toString().padStart(2, "0")}:${seconds.toString().padStart(2, "0")}.${milliseconds.toString().padStart(3, "0")}`,
+  };
+}
+
+export function playAlarm() {
+  try {
+    const ctx = new (window.AudioContext || (window as unknown as { webkitAudioContext: typeof AudioContext }).webkitAudioContext)();
+    const playBeep = (freq: number, startTime: number, duration: number) => {
+      const osc = ctx.createOscillator();
+      const gain = ctx.createGain();
+      osc.connect(gain);
+      gain.connect(ctx.destination);
+      osc.frequency.value = freq;
+      osc.type = "sine";
+      gain.gain.setValueAtTime(0.3, startTime);
+      gain.gain.exponentialRampToValueAtTime(0.01, startTime + duration);
+      osc.start(startTime);
+      osc.stop(startTime + duration);
+    };
+    const now = ctx.currentTime;
+    playBeep(880, now, 0.15);
+    playBeep(880, now + 0.25, 0.15);
+    playBeep(1100, now + 0.5, 0.15);
+    playBeep(880, now + 0.75, 0.15);
+    playBeep(880, now + 1.0, 0.15);
+    playBeep(1100, now + 1.25, 0.3);
+    setTimeout(() => ctx.close(), 3000);
+  } catch {
+    // Audio not available
+  }
+}
+
+export function requestNotificationPermission() {
+  if (typeof window !== "undefined" && "Notification" in window) {
+    if (Notification.permission === "default") {
+      Notification.requestPermission();
+    }
+  }
+}
+
+export function sendNotification(label: string) {
+  if (typeof window !== "undefined" && "Notification" in window) {
+    if (Notification.permission === "granted") {
+      new Notification("⏰ Minuteur terminé", {
+        body: label ? `${label} est terminé !` : "Le minuteur est terminé !",
+      });
+    }
+  }
+}
+
+export function toggleFullscreen() {
+  if (!document.fullscreenElement) {
+    document.documentElement.requestFullscreen().catch(() => {});
+  } else {
+    document.exitFullscreen().catch(() => {});
+  }
+}
+
+export function copyToClipboard(text: string): Promise<boolean> {
+  return navigator.clipboard
+    .writeText(text)
+    .then(() => true)
+    .catch(() => false);
+}