Add macOS support (#23)

* Add macOS support

* Update README

* Update to v0.2.0

* Document breaking changes

* Delete widget tests

darwin/Classes/Store/NearbyDevicesStore.swift

@@ -0,0 +1,59 @@
+//
+//  NearbyDevicesStore.swift
+//  nearby_service
+//
+//  Created by Kseniia Nikitina on 16/1/24.
+//
+
+import Foundation
+import MultipeerConnectivity
+
+class NearbyDevicesStore : NSObject {
+    static let instance = NearbyDevicesStore()
+    
+    private var devices : [NearbyDevice] = []
+    
+    func getDevices() -> [NearbyDevice] {
+        return devices
+    }
+    
+    func find(for deviceId: String) -> NearbyDevice? {
+        return devices.first { device in
+            return device.peerID.displayName == deviceId
+        }
+    }
+
+    
+    func add(for peerID: MCPeerID, discoveryInfo: [String: String]? = nil) -> NearbyDevice? {
+        devices = devices.filter{$0.peerID.displayName != peerID.displayName}
+        
+        let device = NearbyDevice.fromDictionary(for: discoveryInfo, with: peerID)
+        self.devices.append(device)
+        
+        return device
+    }
+    
+    func remove(for peerID: MCPeerID) {
+        self.devices = devices.filter{$0.peerID.displayName != peerID.displayName}
+    }
+    
+    func clear() {
+        self.devices = []
+    }
+    
+    func toDartFormat() -> String {
+        let devicesObject = devices.map { device in
+            return device.toDictionary()
+        }
+        do {
+            let jsonData = try JSONSerialization.data(withJSONObject: devicesObject)
+            if let jsonString = String(data: jsonData, encoding: .utf8) {
+                return jsonString
+            }
+        } catch {
+            return "[]"
+        }
+        return "[]"
+    }
+    
+}

darwin/Classes/Store/NearbyFilesStore.swift

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+//
+//  NearbyFilesStore.swift
+//  nearby_service
+//
+//  Created by Kseniia Nikitina on 3/2/24.
+//
+
+import Foundation
+import MultipeerConnectivity
+
+class NearbyFilesStore {
+    static let instance = NearbyFilesStore()
+    
+    private var paths : [String] = []
+    private var senderName: String? = nil
+    private var maxCount: Int = 0
+    private var count: Int = 0
+    private var id: String? = nil
+    
+    func startReceiving(command: NearbyStartCommand) {
+        self.paths.removeAll()
+        self.id = command.id
+        self.senderName = command.senderName
+        self.maxCount = command.filesCount
+        self.count = 0
+    }
+    
+    func add(url: URL) {
+        paths.append(url.path)
+        self.count = self.count + 1
+    }
+    
+    func checkIsFull() -> Bool {
+        return maxCount <= count
+    }
+    
+    func clear() {
+        self.id = nil
+        self.paths.removeAll()
+        self.senderName = nil
+        self.maxCount = 0
+        self.count = 0
+    }
+    
+    func toDartFormat(peerID: MCPeerID) -> String? {
+        if (senderName != nil && id != nil) {
+            let object = [
+                "id": id!,
+                "files":  paths.map { ["path": $0]},
+                "sender": ["id": peerID.displayName, "displayName": senderName!]
+            ] as [String : Any]
+            do {
+                let jsonData = try JSONSerialization.data(withJSONObject: object)
+                if let jsonString = String(data: jsonData, encoding: .utf8) {
+                    return jsonString
+                }
+            } catch {
+                return nil
+            }
+            return nil
+        }
+        return nil
+    }
+}

darwin/Classes/Store/NearbyRequestsStore.swift

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+//
+//  NearbyRequestsStore.swift
+//  nearby_service
+//
+//  Created by Kseniia Nikitina on 5/2/24.
+//
+
+import Foundation
+
+class NearbyRequestsStore {
+    static let instance = NearbyRequestsStore()
+    
+    private var requests : [NearbyMessageFilesRequest] = []
+   
+    
+    func add(request: NearbyMessageFilesRequest) {
+        requests.append(request)
+    }
+    
+    func find(for id: String) -> NearbyMessageFilesRequest? {
+        return requests.first { request in
+            return request.id == id
+        }
+    }
+ 
+    func remove(for id: String) {
+        self.requests = requests.filter{$0.id != id}
+    }
+}