From 091f313b01860852d414487658265d0744828e8c Mon Sep 17 00:00:00 2001
From: Valentin Perignon <valentin.perignon@infomaniak.com>
Date: Tue, 20 Jun 2023 11:25:37 +0200
Subject: [PATCH] feat: Add debounce

---
 .../New Message/AutocompletionView.swift      | 19 +++++++++++-------
 .../ComposeMessageCellRecipients.swift        | 20 ++++++++++++++-----
 Mail/Views/New Message/RecipientField.swift   |  2 +-
 3 files changed, 28 insertions(+), 13 deletions(-)

diff --git a/Mail/Views/New Message/AutocompletionView.swift b/Mail/Views/New Message/AutocompletionView.swift
index 37abdf3883..cc074e6cff 100644
--- a/Mail/Views/New Message/AutocompletionView.swift	
+++ b/Mail/Views/New Message/AutocompletionView.swift	
@@ -16,6 +16,7 @@
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+import Combine
 import MailCore
 import MailResources
 import RealmSwift
@@ -24,8 +25,9 @@ import SwiftUI
 struct AutocompletionView: View {
     @State private var shouldAddUserProposal = false
 
+    @ObservedObject var cellRecipientsModel: CellRecipientsModel
+
     @Binding var autocompletion: [Recipient]
-    @Binding var currentSearch: String
     @Binding var addedRecipients: RealmSwift.List<Recipient>
 
     let addRecipient: @MainActor (Recipient) -> Void
@@ -40,7 +42,7 @@ struct AutocompletionView: View {
                     AutocompletionCell(
                         addRecipient: addRecipient,
                         recipient: recipient,
-                        highlight: currentSearch,
+                        highlight: cellRecipientsModel.currentText,
                         alreadyAppend: addedRecipients.contains { $0.isSameRecipient(as: recipient) },
                         unknownRecipient: isUserProposal
                     )
@@ -52,9 +54,12 @@ struct AutocompletionView: View {
             }
         }
         .onAppear {
-            updateAutocompletion(currentSearch)
+            updateAutocompletion(cellRecipientsModel.currentText)
+        }
+        // .onChange(of: currentSearch, perform: updateAutocompletion)
+        .onReceive(cellRecipientsModel.$currentText.debounce(for: .milliseconds(150), scheduler: DispatchQueue.main)) { currentValue in
+            updateAutocompletion("\(currentValue)")
         }
-        .onChange(of: currentSearch, perform: updateAutocompletion)
     }
 
     private func updateAutocompletion(_ search: String) {
@@ -73,10 +78,10 @@ struct AutocompletionView: View {
         let realResults = autocompleteRecipients.filter { !addedRecipients.map(\.email).contains($0.email) }
 
         withAnimation {
-            shouldAddUserProposal = !(realResults.count == 1 && realResults.first?.email == currentSearch)
+            shouldAddUserProposal = !(realResults.count == 1 && realResults.first?.email == cellRecipientsModel.currentText)
             if shouldAddUserProposal {
                 autocompleteRecipients
-                    .append(Recipient(email: currentSearch, name: ""))
+                    .append(Recipient(email: cellRecipientsModel.currentText, name: ""))
             }
 
             autocompletion = autocompleteRecipients
@@ -87,8 +92,8 @@ struct AutocompletionView: View {
 struct AutocompletionView_Previews: PreviewProvider {
     static var previews: some View {
         AutocompletionView(
+            cellRecipientsModel: CellRecipientsModel(),
             autocompletion: .constant([]),
-            currentSearch: .constant(""),
             addedRecipients: .constant([PreviewHelper.sampleRecipient1].toRealmList())
         ) { _ in /* Preview */ }
     }
diff --git a/Mail/Views/New Message/Header Cells/ComposeMessageCellRecipients.swift b/Mail/Views/New Message/Header Cells/ComposeMessageCellRecipients.swift
index 500c3b4d4f..515b1af8fc 100644
--- a/Mail/Views/New Message/Header Cells/ComposeMessageCellRecipients.swift	
+++ b/Mail/Views/New Message/Header Cells/ComposeMessageCellRecipients.swift	
@@ -33,8 +33,13 @@ extension VerticalAlignment {
     static let newMessageCellAlignment = VerticalAlignment(NewMessageCellAlignment.self)
 }
 
+class CellRecipientsModel: ObservableObject {
+    @Published var currentText = ""
+}
+
 struct ComposeMessageCellRecipients: View {
-    @State private var currentText = ""
+    @StateObject private var cellRecipientsModel = CellRecipientsModel()
+
     @State private var autocompletion = [Recipient]()
 
     @Binding var recipients: RealmSwift.List<Recipient>
@@ -52,7 +57,12 @@ struct ComposeMessageCellRecipients: View {
                     Text(type.title)
                         .textStyle(.bodySecondary)
 
-                    RecipientField(currentText: $currentText, recipients: $recipients, focusedField: _focusedField, type: type) {
+                    RecipientField(
+                        currentText: $cellRecipientsModel.currentText,
+                        recipients: $recipients,
+                        focusedField: _focusedField,
+                        type: type
+                    ) {
                         if let bestMatch = autocompletion.first {
                             addNewRecipient(bestMatch)
                         }
@@ -70,8 +80,8 @@ struct ComposeMessageCellRecipients: View {
 
             if autocompletionType == type {
                 AutocompletionView(
+                    cellRecipientsModel: cellRecipientsModel,
                     autocompletion: $autocompletion,
-                    currentSearch: $currentText,
                     addedRecipients: $recipients,
                     addRecipient: addNewRecipient
                 )
@@ -81,7 +91,7 @@ struct ComposeMessageCellRecipients: View {
         .onTapGesture {
             focusedField = type
         }
-        .onChange(of: currentText) { newValue in
+        .onChange(of: cellRecipientsModel.currentText) { newValue in
             withAnimation {
                 if newValue.isEmpty {
                     autocompletionType = nil
@@ -109,7 +119,7 @@ struct ComposeMessageCellRecipients: View {
         withAnimation {
             $recipients.append(recipient)
         }
-        currentText = ""
+        cellRecipientsModel.currentText = ""
     }
 }
 
diff --git a/Mail/Views/New Message/RecipientField.swift b/Mail/Views/New Message/RecipientField.swift
index ce0cde8fe0..d230e619d5 100644
--- a/Mail/Views/New Message/RecipientField.swift	
+++ b/Mail/Views/New Message/RecipientField.swift	
@@ -82,7 +82,7 @@ struct RecipientField: View {
     }
 
     private func switchFocus() {
-        guard case .chip(let hash, let recipient) = focusedField else { return }
+        guard case let .chip(hash, recipient) = focusedField else { return }
 
         if recipient == recipients.last {
             focusedField = type