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app/animations/party.py

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+"""Party animation – slow color drift + irregular beat pulses."""
+
+from __future__ import annotations
+
+import colorsys
+import random
+import time
+
+from .base import Animation
+
+
+class PartyAnimation(Animation):
+    name = "party"
+    interval = 0.10
+
+    def on_start(self) -> None:
+        super().on_start()
+        self._hue = 210.0          # start blue-ish
+        self._brightness = 35.0
+        self._direction = 1.0
+        self._pulse = 0.0
+        self._next_pulse = time.monotonic() + 1.2
+        self._next_color_jump = time.monotonic() + 2.5
+
+    def tick(self) -> None:
+        now = time.monotonic()
+
+        # slow hue drift (blue → cyan → violet → magenta → blue)
+        self._hue += 1.2
+        if self._hue >= 330:
+            self._hue = 210.0
+
+        # gentle base breathing
+        self._brightness += self._direction * 0.7
+        if self._brightness >= 55:
+            self._brightness = 55
+            self._direction = -1
+        if self._brightness <= 28:
+            self._brightness = 28
+            self._direction = 1
+
+        # irregular beat pulses
+        if now >= self._next_pulse:
+            self._pulse = 20
+            self._next_pulse = now + 0.6 + random.random() * 1.2
+
+        if self._pulse > 0:
+            self._brightness += self._pulse
+            self._pulse *= 0.65
+
+        brightness = max(20, min(80, self._brightness))
+
+        # occasional stronger color jump
+        if now >= self._next_color_jump:
+            self._hue += 25 + random.random() * 60
+            if self._hue >= 330:
+                self._hue = 210.0
+            self._next_color_jump = now + 1.8 + random.random() * 3.0
+
+        r, g, b = colorsys.hsv_to_rgb(self._hue / 360.0, 1.0, 1.0)
+        self.shelly.set_color(
+            int(r * 255),
+            int(g * 255),
+            int(b * 255),
+            gain=int(brightness),
+        )