chore: Implement UI display with manual scroll for Carousel View (RMC…

…CX-7619)

Sources/RInAppMessaging/CampaignDispatcher.swift

@@ -24,6 +24,14 @@ internal class CampaignDispatcher: CampaignDispatcherType, TaskSchedulable {
     private let dispatchQueue = DispatchQueue(label: "IAM.CampaignDisplay", qos: .userInteractive)
     private(set) var queuedCampaignIDs = [String]()
     private(set) var isDispatching = false
+
+    private let urlCache: URLCache = {
+        // response must be <= 5% of mem/disk cap in order to committed to cache
+        let cache = URLCache(memoryCapacity: URLCache.shared.memoryCapacity,
+                                   diskCapacity: 100 * 1024 * 1024,  // fits up to 5MB images
+                                   diskPath: "RInAppMessaging")
+        return cache
+    }()
 
     weak var delegate: CampaignDispatcherDelegate?
     var scheduledTask: DispatchWorkItem?
@@ -41,11 +49,7 @@ internal class CampaignDispatcher: CampaignDispatcherType, TaskSchedulable {
         sessionConfig.timeoutIntervalForRequest = Constants.CampaignMessage.imageRequestTimeoutSeconds
         sessionConfig.timeoutIntervalForResource = Constants.CampaignMessage.imageResourceTimeoutSeconds
         sessionConfig.waitsForConnectivity = true
-        sessionConfig.urlCache = URLCache(
-            // response must be <= 5% of mem/disk cap in order to committed to cache
-            memoryCapacity: URLCache.shared.memoryCapacity,
-            diskCapacity: 100*1024*1024, // fits up to 5MB images
-            diskPath: "RInAppMessaging")
+        sessionConfig.urlCache = urlCache
         httpSession = URLSession(configuration: sessionConfig)
     }
 
@@ -109,7 +113,17 @@ internal class CampaignDispatcher: CampaignDispatcherType, TaskSchedulable {
                         self.dispatchNext()
                         return
                     }
-                    self.displayCampaign(campaign, imageBlob: imgBlob)
+                    if !(campaign.data.customJson?.carousel?.images?.isEmpty ?? true) {
+                        if let carouselData = campaign.data.customJson?.carousel {
+                            DispatchQueue.main.sync {
+                                self.fetchImagesArray(from: carouselData) { images in
+                                    self.displayCampaign(campaign, imageBlob: imgBlob, carouselImages: images)
+                                }
+                            }
+                        }
+                    } else {
+                        self.displayCampaign(campaign, imageBlob: imgBlob)
+                    }
                 }
             }
         } else {
@@ -118,10 +132,9 @@ internal class CampaignDispatcher: CampaignDispatcherType, TaskSchedulable {
         }
     }
 
-    private func displayCampaign(_ campaign: Campaign, imageBlob: Data? = nil) {
+    private func displayCampaign(_ campaign: Campaign, imageBlob: Data? = nil, carouselImages: [UIImage?]? = nil) {
         let campaignTitle = campaign.data.messagePayload.title
-
-        router.displayCampaign(campaign, associatedImageData: imageBlob, confirmation: {
+        router.displayCampaign(campaign, associatedImageData: imageBlob, carouselImages: carouselImages, confirmation: {
             let contexts = campaign.contexts
             guard let delegate = self.delegate, !contexts.isEmpty, !campaign.data.isTest else {
                 return true
@@ -167,4 +180,68 @@ internal class CampaignDispatcher: CampaignDispatcherType, TaskSchedulable {
             completion(data)
         }.resume()
     }
+
+    func fetchImagesArray(from carousel: Carousel, completion: @escaping ([UIImage?]) -> Void) {
+        guard let imageDetails = carousel.images else {
+            completion([])
+            return
+        }
+
+        let filteredDetails = imageDetails
+            .sorted { $0.key < $1.key }
+            .prefix(5)
+            .map { $0 }
+
+        let dispatchGroup = DispatchGroup()
+        var images: [UIImage?] = Array(repeating: nil, count: filteredDetails.count)
+
+        for (index, detail) in filteredDetails.enumerated() {
+            guard let urlString = detail.value.imgUrl else {
+                images[index] = nil
+                continue
+            }
+
+            dispatchGroup.enter()
+            fetchCarouselImage(for: urlString) { image in
+                images[index] = image
+                dispatchGroup.leave()
+            }
+        }
+
+        dispatchGroup.notify(queue: .main) {
+            completion(images)
+        }
+    }
+
+    func fetchCarouselImage(for urlString: String, completion: @escaping (UIImage?) -> Void) {
+        guard let url = URL(string: urlString),
+              ["jpg", "jpeg", "png"].contains(url.pathExtension.lowercased()) else {
+            completion(nil)
+            return
+        }
+
+        let request = URLRequest(url: url)
+
+        // Check cache
+        if let cachedResponse = self.urlCache.cachedResponse(for: request),
+           let cachedImage = UIImage(data: cachedResponse.data) {
+            completion(cachedImage)
+            return
+        }
+
+        URLSession.shared.dataTask(with: request) { data, response, error in
+            if let data = data,
+               let response = response,
+               error == nil,
+               let httpResponse = response as? HTTPURLResponse,
+               httpResponse.statusCode == 200,
+               let image = UIImage(data: data) {
+                let cachedData = CachedURLResponse(response: response, data: data)
+                self.urlCache.storeCachedResponse(cachedData, for: request)
+                completion(image)
+            } else {
+                completion(nil)
+            }
+        }.resume()
+    }
 }

Sources/RInAppMessaging/Constants.swift

@@ -5,6 +5,7 @@ internal enum Constants {
     enum CampaignMessage {
         static let imageRequestTimeoutSeconds: TimeInterval = 20
         static let imageResourceTimeoutSeconds: TimeInterval = 300
+        static let carouselThreshold: Int = 5
     }
 
     enum Request {

Sources/RInAppMessaging/Models/Responses/CampaignDataModels.swift

@@ -160,6 +160,10 @@ struct Carousel: Codable {
         case images
     }
 
+    init(images: [String: ImageDetails]?) {
+        self.images = images
+    }
+
     init(from decoder: Decoder) throws {
         let container = try decoder.container(keyedBy: CodingKeys.self)
         images = try container.decodeIfPresent([String: ImageDetails].self, forKey: .images)
@@ -177,6 +181,12 @@ struct ImageDetails: Codable {
         case altText
     }
 
+    init(imgUrl: String?, link: String?, altText: String?) {
+        self.imgUrl = imgUrl
+        self.altText = altText
+        self.link = link
+    }
+
     init(from decoder: Decoder) throws {
         let container = try decoder.container(keyedBy: CodingKeys.self)
         imgUrl = try container.decodeIfPresent(String.self, forKey: .imgUrl)