Add search state object

Model/SearchState.swift

@@ -0,0 +1,63 @@
+import Defaults
+import Siesta
+import SwiftUI
+
+final class SearchState: ObservableObject {
+    @Published var query = SearchQuery()
+    @Default(.searchQuery) private var queryText
+
+    private var previousResource: Resource?
+    private var resource: Resource!
+
+    @Published var store = Store<[Video]>()
+
+    init() {
+        let newQuery = query
+        newQuery.query = queryText
+        query = newQuery
+
+        resource = InvidiousAPI.shared.search(newQuery)
+    }
+
+    var isLoading: Bool {
+        resource.isLoading
+    }
+
+    func changeQuery(_ changeHandler: @escaping (SearchQuery) -> Void = { _ in }) {
+        changeHandler(query)
+
+        let newResource = InvidiousAPI.shared.search(query)
+        guard newResource != previousResource else {
+            return
+        }
+
+        previousResource?.removeObservers(ownedBy: store)
+        previousResource = newResource
+
+        queryText = query.query
+
+        resource = newResource
+        resource.addObserver(store)
+        loadResourceIfNeededAndReplaceStore()
+    }
+
+    func loadResourceIfNeededAndReplaceStore() {
+        let currentResource = resource!
+
+        if let request = resource.loadIfNeeded() {
+            request.onSuccess { response in
+                if let videos: [Video] = response.typedContent() {
+                    self.replace(videos, for: currentResource)
+                }
+            }
+        } else {
+            replace(store.collection, for: currentResource)
+        }
+    }
+
+    func replace(_ videos: [Video], for resource: Resource) {
+        if self.resource == resource {
+            store = Store<[Video]>(videos)
+        }
+    }
+}

Model/Store.swift

@@ -7,6 +7,12 @@ final class Store<Data>: ResourceObserver, ObservableObject {
     var collection: Data { all ?? ([] as! Data) }
     var item: Data? { all }
 
+    init(_ data: Data? = nil) {
+        if data != nil {
+            replace(data!)
+        }
+    }
+
     func resourceChanged(_ resource: Resource, event _: ResourceEvent) {
         if let items: Data = resource.typedContent() {
             replace(items)