fix(Bluetooth): update codec selection and error handling

Fixes #2240

quickshell/Services/BluetoothService.qml

@@ -14,6 +14,9 @@ Singleton {
     readonly property bool available: adapter !== null
     readonly property bool enabled: (adapter && adapter.enabled) ?? false
     readonly property bool discovering: (adapter && adapter.discovering) ?? false
+    property bool pactlAvailable: false
+    property bool pactlChecked: false
+    property var pendingPactlActions: []
     readonly property var devices: adapter ? adapter.devices : null
     readonly property bool enhancedPairingAvailable: DMSService.dmsAvailable && DMSService.apiVersion >= 9 && DMSService.capabilities.includes("bluetooth")
     readonly property bool connected: {
@@ -61,6 +64,23 @@ Singleton {
         });
     }
 
+    Component.onCompleted: {
+        detectPactlProcess.running = true;
+    }
+
+    function whenPactlChecked(action) {
+        if (pactlChecked) {
+            action();
+            return;
+        }
+
+        const actions = pendingPactlActions.slice();
+        actions.push(action);
+        pendingPactlActions = actions;
+        if (!detectPactlProcess.running)
+            detectPactlProcess.running = true;
+    }
+
     function sortDevices(devices) {
         return devices.sort((a, b) => {
             const aName = a.name || a.deviceName || "";
@@ -305,6 +325,13 @@ Singleton {
         if (!device || !device.connected || !isAudioDevice(device)) {
             return;
         }
+        if (!pactlChecked) {
+            whenPactlChecked(() => root.refreshDeviceCodec(device));
+            return;
+        }
+        if (!pactlAvailable) {
+            return;
+        }
 
         const cardName = getCardName(device);
         codecQueryProcess.cardName = cardName;
@@ -320,6 +347,14 @@ Singleton {
             callback("");
             return;
         }
+        if (!pactlChecked) {
+            whenPactlChecked(() => root.getCurrentCodec(device, callback));
+            return;
+        }
+        if (!pactlAvailable) {
+            callback("");
+            return;
+        }
 
         const cardName = getCardName(device);
         codecQueryProcess.cardName = cardName;
@@ -335,6 +370,14 @@ Singleton {
             callback([], "");
             return;
         }
+        if (!pactlChecked) {
+            whenPactlChecked(() => root.getAvailableCodecs(device, callback));
+            return;
+        }
+        if (!pactlAvailable) {
+            callback([], "");
+            return;
+        }
 
         const cardName = getCardName(device);
         codecFullQueryProcess.cardName = cardName;
@@ -350,6 +393,14 @@ Singleton {
             callback(false, "Invalid device");
             return;
         }
+        if (!pactlChecked) {
+            whenPactlChecked(() => root.switchCodec(device, profileName, callback));
+            return;
+        }
+        if (!pactlAvailable) {
+            callback(false, I18n.tr("Codec switching is unavailable because pactl was not found"));
+            return;
+        }
 
         const cardName = getCardName(device);
         codecSwitchProcess.cardName = cardName;
@@ -358,6 +409,20 @@ Singleton {
         codecSwitchProcess.running = true;
     }
 
+    Process {
+        id: detectPactlProcess
+        running: false
+        command: ["sh", "-c", "command -v pactl"]
+
+        onExited: function (exitCode) {
+            root.pactlAvailable = (exitCode === 0);
+            root.pactlChecked = true;
+            const actions = root.pendingPactlActions.slice();
+            root.pendingPactlActions = [];
+            actions.forEach(action => action());
+        }
+    }
+
     Process {
         id: codecQueryProcess