Yattee v2 rewrite

Yattee/Services/Migration/LegacyDataModels.swift

@@ -0,0 +1,170 @@
+//
+//  LegacyDataModels.swift
+//  Yattee
+//
+//  Data models for parsing v1 UserDefaults format during migration.
+//
+
+import Foundation
+
+// MARK: - Legacy Instance
+
+/// Represents a v1 Instance stored in UserDefaults under the "instances" key.
+/// The v1 format used Defaults.Serializable with a bridge that stored instances as [String: String] dictionaries.
+struct LegacyInstance {
+    /// The app type: "invidious", "piped", "peerTube", "local"
+    let app: String
+
+    /// UUID string identifier
+    let id: String
+
+    /// User-defined name for the instance
+    let name: String
+
+    /// The API URL string (e.g., "https://invidious.example.com")
+    let apiURL: String
+
+    /// Optional frontend URL (used by Piped)
+    let frontendURL: String?
+
+    /// Whether the instance proxies videos
+    let proxiesVideos: Bool
+
+    /// Whether to use Invidious Companion
+    let invidiousCompanion: Bool
+
+    /// Parses a dictionary from v1 UserDefaults format.
+    /// - Parameter dictionary: The serialized instance dictionary
+    /// - Returns: A LegacyInstance if parsing succeeds, nil otherwise
+    static func parse(from dictionary: [String: Any]) -> LegacyInstance? {
+        guard let app = dictionary["app"] as? String,
+              let id = dictionary["id"] as? String,
+              let apiURL = dictionary["apiURL"] as? String else {
+            return nil
+        }
+
+        let name = dictionary["name"] as? String ?? ""
+        let frontendURL = dictionary["frontendURL"] as? String
+        let proxiesVideos = (dictionary["proxiesVideos"] as? String) == "true"
+        let invidiousCompanion = (dictionary["invidiousCompanion"] as? String) == "true"
+
+        return LegacyInstance(
+            app: app,
+            id: id,
+            name: name,
+            apiURL: apiURL,
+            frontendURL: frontendURL?.isEmpty == true ? nil : frontendURL,
+            proxiesVideos: proxiesVideos,
+            invidiousCompanion: invidiousCompanion
+        )
+    }
+
+    /// Converts the legacy app type string to the v2 InstanceType.
+    var instanceType: InstanceType? {
+        switch app.lowercased() {
+        case "invidious":
+            return .invidious
+        case "piped":
+            return .piped
+        case "peertube":
+            return .peertube
+        default:
+            return nil
+        }
+    }
+
+    /// The URL object for this instance.
+    var url: URL? {
+        URL(string: apiURL)
+    }
+}
+
+// MARK: - Legacy Import Item
+
+/// Represents an instance to be imported from v1 data.
+/// Only instances are imported - users need to re-add their accounts after import.
+struct LegacyImportItem: Identifiable, Sendable {
+    /// New UUID for UI identification
+    let id: UUID
+
+    /// The original v1 instance ID
+    let legacyInstanceID: String
+
+    /// The type of instance (Invidious or Piped)
+    let instanceType: InstanceType
+
+    /// The instance URL
+    let url: URL
+
+    /// User-defined name for the instance
+    let name: String?
+
+    /// Whether this item is selected for import
+    var isSelected: Bool = true
+
+    /// Current reachability status
+    var reachabilityStatus: ReachabilityStatus = .unknown
+
+    /// Display name for the UI
+    var displayName: String {
+        if let name, !name.isEmpty {
+            return name
+        }
+        return url.host ?? url.absoluteString
+    }
+}
+
+// MARK: - Reachability Status
+
+/// Status of an instance's reachability check.
+enum ReachabilityStatus: Sendable {
+    /// Not yet checked
+    case unknown
+    /// Currently checking
+    case checking
+    /// Instance is reachable
+    case reachable
+    /// Instance is unreachable
+    case unreachable
+}
+
+// MARK: - Migration Result
+
+/// Result of an import operation.
+struct MigrationResult {
+    /// Items that were successfully imported
+    let succeeded: [LegacyImportItem]
+
+    /// Items that failed to import with their errors
+    let failed: [(item: LegacyImportItem, error: MigrationError)]
+
+    /// Items that were skipped because they already exist
+    let skippedDuplicates: [LegacyImportItem]
+
+    /// Whether all selected items were successfully imported
+    var isFullSuccess: Bool {
+        failed.isEmpty
+    }
+
+    /// Total number of items processed
+    var totalProcessed: Int {
+        succeeded.count + failed.count + skippedDuplicates.count
+    }
+}
+
+// MARK: - Migration Error
+
+/// Errors that can occur during migration.
+enum MigrationError: LocalizedError, Sendable {
+    case invalidURL
+    case unknown(String)
+
+    var errorDescription: String? {
+        switch self {
+        case .invalidURL:
+            return String(localized: "migration.error.invalidURL")
+        case .unknown(let message):
+            return message
+        }
+    }
+}