From dc75e7b7a4e4be8f0025c03d90a3656ec2420832 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Junnos=20=EF=A3=BF?= <junnos.dev@gmail.com>
Date: Mon, 27 Nov 2023 21:13:15 +0900
Subject: [PATCH] =?UTF-8?q?:sparkles:=20=EC=97=AC=EC=A0=95=20=EA=B8=B0?=
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---
 .../JourneyListViewController.swift           | 34 ++++++++++++++++++-
 .../Cells/JourneyCell/JourneyCell.swift       | 24 +++++++++++--
 .../JourneyCell/SpotPhotoImageView.swift      |  3 ++
 3 files changed, 57 insertions(+), 4 deletions(-)

diff --git a/iOS/Features/JourneyList/Sources/JourneyList/Presentation/JourneyListViewController.swift b/iOS/Features/JourneyList/Sources/JourneyList/Presentation/JourneyListViewController.swift
index 95fd6df..62d666a 100644
--- a/iOS/Features/JourneyList/Sources/JourneyList/Presentation/JourneyListViewController.swift
+++ b/iOS/Features/JourneyList/Sources/JourneyList/Presentation/JourneyListViewController.swift
@@ -143,14 +143,46 @@ private extension JourneyListViewController {
         return section
     }
     
+    private func fetchImage(url: URL) async throws -> Data {
+        let request = URLRequest(url: url)
+        let (data, response) = try await URLSession.shared.data(for: request)
+        
+        guard let statusCode = (response as? HTTPURLResponse)?.statusCode,
+              (200...299).contains(statusCode) else { throw NSError(domain: "fetch error", code: 1004) }
+        
+        return data
+    }
+    
     func configureDataSource() -> JourneyListDataSource {
+        // TODO: 최적화 & 캐싱
         let cellRegistration = JourneyCellRegistration { cell, _, itemIdentifier in
             let cellModel = JourneyCellModel(location: itemIdentifier.location,
                                              date: itemIdentifier.date,
                                              songTitle: itemIdentifier.song.title,
                                              songArtist: itemIdentifier.song.artist)
             cell.update(with: cellModel)
-//            cell.updateImages(images: itemIdentifier.spot.photoURLs)
+            let photoURLs = itemIdentifier.spots
+                .flatMap { $0.photoURLs }
+                .compactMap { URL(string: $0) }
+            
+            Task {
+                cell.addImageView(count: photoURLs.count)
+                
+                await withTaskGroup(of: (index: Int, imageData: Data).self) { group in
+                    for (index, photoURL) in photoURLs.enumerated() {
+                        group.addTask(priority: .background) { [weak self] in
+                            guard let imageData = try? await self?.fetchImage(url: photoURL) else {
+                                return (0, Data())
+                            }
+                            return (index, imageData)
+                        }
+                    }
+                    
+                    for await (index, imageData) in group {
+                        cell.updateImages(imageData: imageData, atIndex: index)
+                    }
+                }
+            }
         }
       
         let dataSource = JourneyListDataSource(collectionView: self.collectionView,
diff --git a/iOS/MSUIKit/Sources/MSUIKit/Cells/JourneyCell/JourneyCell.swift b/iOS/MSUIKit/Sources/MSUIKit/Cells/JourneyCell/JourneyCell.swift
index 2803faa..3fcaea8 100644
--- a/iOS/MSUIKit/Sources/MSUIKit/Cells/JourneyCell/JourneyCell.swift
+++ b/iOS/MSUIKit/Sources/MSUIKit/Cells/JourneyCell/JourneyCell.swift
@@ -46,6 +46,12 @@ public final class JourneyCell: UICollectionViewCell {
         fatalError("MusicSpot은 code-based로만 작업 중입니다.")
     }
     
+    public override func prepareForReuse() {
+        self.spotImageStack.arrangedSubviews.forEach {
+            $0.removeFromSuperview()
+        }
+    }
+    
     // MARK: - Functions
     
     public func update(with model: JourneyCellModel) {
@@ -55,14 +61,26 @@ public final class JourneyCell: UICollectionViewCell {
                              artist: model.song.artist)
     }
     
-    public func updateImages(images: [Data]) {
-        images.forEach { data in
+    @MainActor
+    public func addImageView(count: Int) {
+        (1...count).forEach { _ in
             let imageView = SpotPhotoImageView()
-            imageView.update(with: data)
             self.spotImageStack.addArrangedSubview(imageView)
         }
     }
     
+    @MainActor
+    public func updateImages(imageData: Data, atIndex index: Int) {
+        guard self.spotImageStack.arrangedSubviews.count > index else {
+            return
+        }
+        guard let imageView = self.spotImageStack.arrangedSubviews[index] as? SpotPhotoImageView else {
+            return
+        }
+        
+        imageView.update(with: imageData)
+    }
+    
 }
 
 // MARK: - UI Configuration
diff --git a/iOS/MSUIKit/Sources/MSUIKit/Cells/JourneyCell/SpotPhotoImageView.swift b/iOS/MSUIKit/Sources/MSUIKit/Cells/JourneyCell/SpotPhotoImageView.swift
index ed041f7..bbf2a88 100644
--- a/iOS/MSUIKit/Sources/MSUIKit/Cells/JourneyCell/SpotPhotoImageView.swift
+++ b/iOS/MSUIKit/Sources/MSUIKit/Cells/JourneyCell/SpotPhotoImageView.swift
@@ -7,6 +7,8 @@
 
 import UIKit
 
+import MSDesignSystem
+
 final class SpotPhotoImageView: UIView {
     
     // MARK: - Constants
@@ -50,6 +52,7 @@ final class SpotPhotoImageView: UIView {
 private extension SpotPhotoImageView {
     
     func configureStyle() {
+        self.backgroundColor = .msColor(.secondaryBackground)
         self.layer.cornerRadius = Metric.cornerRadius
         self.clipsToBounds = true
     }