feat: 최근 들은 콘텐츠 로컬 DB 추가

SodaLive/Sources/MyPage/Recent/DB/RecentContentService.swift

@@ -0,0 +1,123 @@
+//
+//  RecentContentService.swift
+//  SodaLive
+//
+//  Created by klaus on 7/28/25.
+//
+
+import CoreData
+import Combine
+
+class RecentContentService {
+    private let viewContext: NSManagedObjectContext
+    
+    init(context: NSManagedObjectContext = PersistenceController.shared.container.viewContext) {
+        self.viewContext = context
+    }
+    
+    func getRecentContents(limit: Int = 10) -> [RecentContent] {
+        let request = RecentContent.fetchRequest()
+        request.sortDescriptors = [NSSortDescriptor(key: "listenedAt", ascending: false)]
+        request.fetchLimit = limit
+        
+        do {
+            return try viewContext.fetch(request)
+        } catch {
+            print("Error fetching recent contents: \(error)")
+            return []
+        }
+    }
+    
+    func insertRecentContent(contentId: Int64, coverImageUrl: String, title: String, creatorNickname: String) {
+        // Check if content already exists
+        if let existingContent = findContent(byId: contentId) {
+            // Update timestamp
+            existingContent.listenedAt = Date()
+            saveContext()
+        } else {
+            // Create new content
+            let newContent = RecentContent(context: viewContext)
+            newContent.contentId = contentId
+            newContent.coverImageUrl = coverImageUrl
+            newContent.title = title
+            newContent.creatorNickname = creatorNickname
+            newContent.listenedAt = Date()
+            saveContext()
+        }
+        
+        // Keep only most recent 10 items
+        keepMostRecent(limit: 10)
+    }
+    
+    func deleteByContentId(contentId: Int64) {
+        if let content = findContent(byId: contentId) {
+            viewContext.delete(content)
+            saveContext()
+        }
+    }
+    
+    func getCount() -> Int {
+        let request = RecentContent.fetchRequest()
+        
+        do {
+            return try viewContext.count(for: request)
+        } catch {
+            print("Error counting recent contents: \(error)")
+            return 0
+        }
+    }
+    
+    func truncate() {
+        let fetchRequest: NSFetchRequest<NSFetchRequestResult> = RecentContent.fetchRequest()
+        let deleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest)
+        
+        do {
+            try viewContext.execute(deleteRequest)
+            saveContext()
+        } catch {
+            print("Error truncating recent contents: \(error)")
+        }
+    }
+    
+    private func keepMostRecent(limit: Int) {
+        let count = getCount()
+        if count <= limit { return }
+        
+        let request = RecentContent.fetchRequest()
+        request.sortDescriptors = [NSSortDescriptor(key: "listenedAt", ascending: false)]
+        
+        do {
+            let allContents = try viewContext.fetch(request)
+            for i in limit..<allContents.count {
+                viewContext.delete(allContents[i])
+            }
+            saveContext()
+        } catch {
+            print("Error keeping most recent contents: \(error)")
+        }
+    }
+    
+    private func findContent(byId contentId: Int64) -> RecentContent? {
+        let request = RecentContent.fetchRequest()
+        request.predicate = NSPredicate(format: "contentId == %lld", contentId)
+        request.fetchLimit = 1
+        
+        do {
+            let results = try viewContext.fetch(request)
+            return results.first
+        } catch {
+            print("Error finding content by ID: \(error)")
+            return nil
+        }
+    }
+    
+    private func saveContext() {
+        if viewContext.hasChanges {
+            do {
+                try viewContext.save()
+            } catch {
+                print("Error saving context: \(error)")
+            }
+        }
+    }
+}