Update plugins to new class-based structure

plugins/__init__.py

@@ -1,2 +1,2 @@
-from . import fuel_check
-plugins = [fuel_check]
+from .fuel_check import FuelCheck
+plugins = [FuelCheck]

plugins/fuel_check.py

@@ -1,26 +1,35 @@
+"Fuel Check"
 import time
 
-start = time.monotonic()
-last_message = None
-threshold = 5
+from daemon import DaemonPlugin
 
-def check(data, emit):
-    "Checks if the fuel ratio is below a certain threshold"
-    global last_message
-    if "FuelRatio" not in data:
-        return
+class FuelCheck(DaemonPlugin):
+    start = None
+    last_message = None
+    threshold = 5
 
-    ratio = data["FuelRatio"]
-    if ratio <= threshold:
-        if last_message is None:
-            emit("switchPlugin", {
-                "plugin": "warning",
-                "data": {
-                    "title": "Low Fuel",
-                    "description": f"Only {int(ratio)}% fuel left. Please refill the tank."
-                },
-                "time": 5000
-            })
-            last_message = time.monotonic()
-    else:
-        last_message = None
+    def initialize(self):
+        "Initialize plugin"
+        self.start = time.monotonic()
+
+    def check(self, data):
+        "Checks if the fuel ratio is below a certain threshold"
+        if "FuelRatio" not in data:
+            return
+
+        ratio = data["FuelRatio"]
+        if ratio <= self.threshold:
+            if self.last_message is None:
+                desc = f"Only {int(ratio)}% fuel left. Please refill the tank."
+                self.speak(desc)
+                self.emit("switchPlugin", {
+                    "plugin": "warning",
+                    "data": {
+                        "title": "Low Fuel",
+                        "description": desc
+                    },
+                    "time": 5000
+                })
+                self.last_message = time.monotonic()
+        else:
+            self.last_message = None