2 files changed, 85 insertions, 0 deletions
diff --git a/hyprsunset_qt/daemon.py b/hyprsunset_qt/daemon.py
new file mode 100644
index 0000000..7bf0e47
--- /dev/null
+++ b/hyprsunset_qt/daemon.py
@@ -0,0 +1,45 @@
+"""Control the hyprsunset daemon: status, restart, live preview via hyprctl."""
+
+from __future__ import annotations
+
+import shlex
+import subprocess
+from typing import Optional
+
+
+def is_running() -> bool:
+    return subprocess.run(
+        ["pgrep", "-x", "hyprsunset"],
+        stdout=subprocess.DEVNULL,
+        stderr=subprocess.DEVNULL,
+    ).returncode == 0
+
+
+def live_preview(
+    temperature: Optional[int] = None,
+    gamma: Optional[float] = None,
+    identity: bool = False,
+) -> None:
+    """Push values to the running daemon over IPC. No file write, no restart."""
+    if identity:
+        subprocess.run(["hyprctl", "hyprsunset", "identity"], check=False)
+        return
+    if temperature is not None:
+        subprocess.run(
+            ["hyprctl", "hyprsunset", "temperature", str(temperature)],
+            check=False,
+        )
+    if gamma is not None:
+        # IPC gamma is integer percent; profile gamma is a 0-2 float.
+        pct = str(round(gamma * 100))
+        subprocess.run(["hyprctl", "hyprsunset", "gamma", pct], check=False)
+
+
+def restart(command: str = "hyprsunset") -> None:
+    subprocess.run(["pkill", "hyprsunset"], check=False)
+    subprocess.Popen(
+        shlex.split(command),
+        stdout=subprocess.DEVNULL,
+        stderr=subprocess.DEVNULL,
+        start_new_session=True,
+    )
diff --git a/tests/test_daemon.py b/tests/test_daemon.py
new file mode 100644
index 0000000..337dc39
--- /dev/null
+++ b/tests/test_daemon.py
@@ -0,0 +1,40 @@
+from unittest.mock import patch, MagicMock
+from hyprsunset_qt import daemon
+
+
+def test_is_running_true():
+    with patch("hyprsunset_qt.daemon.subprocess.run") as run:
+        run.return_value = MagicMock(returncode=0)
+        assert daemon.is_running() is True
+        run.assert_called_once()
+
+
+def test_is_running_false():
+    with patch("hyprsunset_qt.daemon.subprocess.run") as run:
+        run.return_value = MagicMock(returncode=1)
+        assert daemon.is_running() is False
+
+
+def test_live_preview_identity():
+    with patch("hyprsunset_qt.daemon.subprocess.run") as run:
+        daemon.live_preview(identity=True)
+        run.assert_called_with(
+            ["hyprctl", "hyprsunset", "identity"], check=False
+        )
+
+
+def test_live_preview_temp_and_gamma():
+    with patch("hyprsunset_qt.daemon.subprocess.run") as run:
+        daemon.live_preview(temperature=5500, gamma=0.8)
+        calls = [c.args[0] for c in run.call_args_list]
+        assert ["hyprctl", "hyprsunset", "temperature", "5500"] in calls
+        assert ["hyprctl", "hyprsunset", "gamma", "80"] in calls
+
+
+def test_restart_kills_then_launches():
+    with patch("hyprsunset_qt.daemon.subprocess.run") as run, \
+         patch("hyprsunset_qt.daemon.subprocess.Popen") as popen:
+        daemon.restart("hyprsunset")
+        run.assert_called_with(["pkill", "hyprsunset"], check=False)
+        popen.assert_called_once()
+        assert popen.call_args[0][0] == ["hyprsunset"]