fix: report wakelock failures on Windows and macOS

wakelock_plus/lib/src/wakelock_plus_windows_plugin.dart

@@ -1,5 +1,6 @@
 import 'dart:async';
 
+import 'package:flutter/services.dart';
 import 'package:wakelock_plus_platform_interface/wakelock_plus_platform_interface.dart';
 import 'package:win32/win32.dart';
 
@@ -26,9 +27,15 @@ class WakelockPlusWindowsPlugin extends WakelockPlusPlatformInterface {
     }
 
     // SetThreadExecutionState returns 0 if the operation failed.
-    if (response != 0) {
-      _enabled = enable;
+    if (response == 0) {
+      final operation = enable ? 'enable' : 'disable';
+      throw PlatformException(
+        code: 'wakelock-error',
+        message: 'Failed to $operation wakelock.',
+        details: {'operation': operation},
+      );
     }
+    _enabled = enable;
   }
 
   @override

wakelock_plus/macos/wakelock_plus/Sources/wakelock_plus/WakelockPlusMacosPlugin.swift

@@ -17,32 +17,47 @@ public class WakelockPlusMacosPlugin: NSObject, FlutterPlugin {
     case "toggle":
       let args = call.arguments as? Dictionary<String, Any>
       let enable = args!["enable"] as! Bool
-      if enable {
-        enableWakelock()
+      let status = enable ? enableWakelock() : disableWakelock()
+      if status == kIOReturnSuccess {
+        result(true)
       } else {
-        disableWakelock();
+        let operation = enable ? "enable" : "disable"
+        let description = String(cString: mach_error_string(status))
+        result(FlutterError(
+          code: "wakelock-error",
+          message: "Failed to \(operation) wakelock: \(description)",
+          details: [
+            "operation": operation,
+            "status": Int(status),
+            "description": description
+          ]
+        ))
       }
-      result(true)
     case "enabled":
       result(wakelockEnabled)
     default:
       result(FlutterMethodNotImplemented)
     }
   }
 
-  func enableWakelock(reason: String = "Disabling display sleep") {
-    if !wakelockEnabled {
-      wakelockEnabled = IOPMAssertionCreateWithName( kIOPMAssertionTypeNoDisplaySleep as CFString,
-                                       IOPMAssertionLevel(kIOPMAssertionLevelOn),
-                                       reason as CFString,
-                                       &assertionID) == kIOReturnSuccess
-    }
+  func enableWakelock(reason: String = "Disabling display sleep") -> IOReturn {
+    guard !wakelockEnabled else { return kIOReturnSuccess }
+    let status = IOPMAssertionCreateWithName(
+      kIOPMAssertionTypeNoDisplaySleep as CFString,
+      IOPMAssertionLevel(kIOPMAssertionLevelOn),
+      reason as CFString,
+      &assertionID
+    )
+    wakelockEnabled = status == kIOReturnSuccess
+    return status
   }
 
-  func disableWakelock() {
-    if wakelockEnabled {
-      IOPMAssertionRelease(assertionID)
+  func disableWakelock() -> IOReturn {
+    guard wakelockEnabled else { return kIOReturnSuccess }
+    let status = IOPMAssertionRelease(assertionID)
+    if status == kIOReturnSuccess {
       wakelockEnabled = false
     }
+    return status
   }
 }