Channels search, add SDWebImage framework

Model/Search/SearchModel.swift

@@ -0,0 +1,102 @@
+import Defaults
+import Siesta
+import SwiftUI
+
+final class SearchModel: ObservableObject {
+    @Published var store = Store<[ContentItem]>()
+
+    var accounts = AccountsModel()
+    @Published var query = SearchQuery()
+    @Published var queryText = ""
+    @Published var querySuggestions = Store<[String]>()
+
+    private var previousResource: Resource?
+    private var resource: Resource!
+
+    var isLoading: Bool {
+        resource?.isLoading ?? false
+    }
+
+    func changeQuery(_ changeHandler: @escaping (SearchQuery) -> Void = { _ in }) {
+        changeHandler(query)
+
+        let newResource = accounts.api.search(query)
+        guard newResource != previousResource else {
+            return
+        }
+
+        previousResource?.removeObservers(ownedBy: store)
+        previousResource = newResource
+
+        resource = newResource
+        resource.addObserver(store)
+
+        if !query.isEmpty {
+            loadResourceIfNeededAndReplaceStore()
+        }
+    }
+
+    func resetQuery(_ query: SearchQuery = SearchQuery()) {
+        self.query = query
+
+        let newResource = accounts.api.search(query)
+        guard newResource != previousResource else {
+            return
+        }
+
+        store.replace([])
+
+        previousResource?.removeObservers(ownedBy: store)
+        previousResource = newResource
+
+        resource = newResource
+        resource.addObserver(store)
+
+        if !query.isEmpty {
+            loadResourceIfNeededAndReplaceStore()
+        }
+    }
+
+    func loadResourceIfNeededAndReplaceStore() {
+        let currentResource = resource!
+
+        if let request = resource.loadIfNeeded() {
+            request.onSuccess { response in
+                if let results: [ContentItem] = response.typedContent() {
+                    self.replace(results, for: currentResource)
+                }
+            }
+        } else {
+            replace(store.collection, for: currentResource)
+        }
+    }
+
+    func replace(_ videos: [ContentItem], for resource: Resource) {
+        if self.resource == resource {
+            store = Store<[ContentItem]>(videos)
+        }
+    }
+
+    private var suggestionsDebounceTimer: Timer?
+
+    func loadSuggestions(_ query: String) {
+        suggestionsDebounceTimer?.invalidate()
+
+        suggestionsDebounceTimer = Timer.scheduledTimer(withTimeInterval: 1, repeats: false) { _ in
+            let resource = self.accounts.api.searchSuggestions(query: query)
+
+            resource.addObserver(self.querySuggestions)
+            resource.loadIfNeeded()
+
+            if let request = resource.loadIfNeeded() {
+                request.onSuccess { response in
+                    if let suggestions: [String] = response.typedContent() {
+                        self.querySuggestions = Store<[String]>(suggestions)
+                    }
+                }
+            } else {
+                self.querySuggestions = Store<[String]>(self.querySuggestions.collection)
+            }
+        }
+    }
+}