Initial commit

2026-09-13 20:21:10 +02:00
commit 18d7d56345
42 changed files with 5459 additions and 0 deletions
@@ -0,0 +1,65 @@
+import Foundation
+
+public struct ProjectAutosavePolicy: Equatable, Sendable {
+    public static let `default` = ProjectAutosavePolicy()
+
+    public var minimumVersionInterval: TimeInterval
+    public var versionLabel: String
+
+    public init(
+        minimumVersionInterval: TimeInterval = 300,
+        versionLabel: String = "Autosave checkpoint"
+    ) {
+        self.minimumVersionInterval = minimumVersionInterval
+        self.versionLabel = versionLabel
+    }
+}
+
+public struct ProjectAutosaveResult: Equatable, Sendable {
+    public var project: SongProject
+    public var didCreateVersion: Bool
+
+    public init(project: SongProject, didCreateVersion: Bool) {
+        self.project = project
+        self.didCreateVersion = didCreateVersion
+    }
+}
+
+public actor ProjectAutosaveService {
+    private let store: any ProjectStore
+    private let policy: ProjectAutosavePolicy
+
+    public init(store: any ProjectStore, policy: ProjectAutosavePolicy = .default) {
+        self.store = store
+        self.policy = policy
+    }
+
+    public func autosave(_ project: SongProject, at savedAt: Date = Date()) async throws -> ProjectAutosaveResult {
+        var autosavedProject = project
+        var didCreateVersion = false
+
+        if shouldCreateAutosaveVersion(for: autosavedProject, at: savedAt) {
+            _ = autosavedProject.createVersion(label: policy.versionLabel, createdAt: savedAt)
+            didCreateVersion = true
+        }
+
+        autosavedProject.updatedAt = savedAt
+        try await store.save(autosavedProject)
+
+        return ProjectAutosaveResult(project: autosavedProject, didCreateVersion: didCreateVersion)
+    }
+
+    private func shouldCreateAutosaveVersion(for project: SongProject, at savedAt: Date) -> Bool {
+        let currentSnapshot = SongProjectSnapshot(project: project)
+
+        guard let latestVersion = project.versions.last else {
+            return true
+        }
+
+        guard latestVersion.snapshot != currentSnapshot else {
+            return false
+        }
+
+        return savedAt.timeIntervalSince(latestVersion.createdAt) >= policy.minimumVersionInterval
+    }
+}