save page turn mode and background color to local state

ImageViewer/ViewController.swift

@@ -5,7 +5,7 @@ enum PageTurn {
     case previous
 }
 
-enum PageTurnMode {
+enum PageTurnMode: Codable {
     case leftToRight
     case rightToLeft
     case scroll
@@ -24,6 +24,8 @@ struct GlobalState: Codable {
 struct LocalState: Codable {
     var chapter: Int
     var page: Int
+    var turnMode: PageTurnMode
+    var backgroundColor: String = "clear"
 }
 
 struct Metadata: Decodable {
@@ -93,8 +95,18 @@ class ViewController: UIViewController, UIGestureRecognizerDelegate {
     }
 
     func setup() {
+        do {
+            if try fileManager.contentsOfDirectory(atPath: documentsURL.path).isEmpty {
+                saveGlobalState()
+            }
+        } catch {
+            saveGlobalState()
+        }
+
         homeView.translatesAutoresizingMaskIntoConstraints = false
         readerView.translatesAutoresizingMaskIntoConstraints = false
+        readerView.isHidden = true
+        homeView.isHidden = false
         view.addSubview(homeView)
         view.addSubview(readerView)
         NSLayoutConstraint.activate([
@@ -115,9 +127,6 @@ class ViewController: UIViewController, UIGestureRecognizerDelegate {
         setupHomeView()
         if let name = globalState.comicName {
             readComic(name: name)
-        } else {
-            readerView.isHidden = true
-            homeView.isHidden = false
         }
     }
 
@@ -185,9 +194,36 @@ class ViewController: UIViewController, UIGestureRecognizerDelegate {
         }
     }
 
+    func convertColorToString(color: UIColor) -> String {
+        return switch color {
+        case .white: "white"
+        case .gray: "gray"
+        case .black: "black"
+        case .red: "red"
+        case .blue: "blue"
+        default: "clear"
+        }
+    }
+
+    func convertStringToColor(str: String) -> UIColor {
+        return switch str {
+        case "white": .white
+        case "gray": .gray
+        case "black": .black
+        case "red": .red
+        case "blue": .blue
+        default: .clear
+        }
+    }
+
     func saveLocalState() {
         do {
-            try JSONEncoder().encode(LocalState(chapter: currentChapter, page: currentPage)).write(
+            try JSONEncoder().encode(
+                LocalState(
+                    chapter: currentChapter, page: currentPage, turnMode: mode,
+                    backgroundColor: convertColorToString(
+                        color: readerView.backgroundColor ?? .white))
+            ).write(
                 to: currentPath.appendingPathComponent("state.json"))
         } catch {
             print("failed to save local state")
@@ -203,6 +239,8 @@ class ViewController: UIViewController, UIGestureRecognizerDelegate {
             let l = try JSONDecoder().decode(LocalState.self, from: json)
             currentPage = l.page
             currentChapter = l.chapter
+            mode = l.turnMode
+            readerView.backgroundColor = convertStringToColor(str: l.backgroundColor)
         } catch {
             print("failed to load local state")
         }
@@ -326,6 +364,8 @@ class ViewController: UIViewController, UIGestureRecognizerDelegate {
     @objc func goHome() {
         readerView.isHidden = true
         homeView.isHidden = false
+        globalState.comicName = nil
+        saveGlobalState()
     }
 
     func setupBackgroundColorDropdown() {
@@ -472,6 +512,7 @@ class ViewController: UIViewController, UIGestureRecognizerDelegate {
             }
         }
         togglePageTurnDropdown()
+        saveLocalState()
     }
 
     @objc func handleBackgroundColorOption(_ sender: UIButton) {
@@ -486,6 +527,7 @@ class ViewController: UIViewController, UIGestureRecognizerDelegate {
             }
         }
         toggleBackgroundColorDropdown()
+        saveLocalState()
     }
 
     @objc func togglePageTurnDropdown() {