byre/mac/Sources/Byre/Persistence.swift

import Foundation
import SwiftData

@Model
final class ServerRecord {
    var origin = ""
    var saved = Date.distantPast
    var color = 0

    init(origin: String, color: Int) {
        self.origin = origin
        self.color = color
        saved = Date()
    }
}

@Model
final class DraftRecord {
    var scope = ""
    var json = Data()
    var saved = Date.distantPast

    init(scope: String, json: Data) {
        self.scope = scope
        self.json = json
        saved = Date()
    }
}

@Model
final class VisitRecord {
    var taskId = ""
    var at = 0.0

    init(taskId: String, at: Double) {
        self.taskId = taskId
        self.at = at
    }
}

private let container: ModelContainer = {
    let schema = Schema([ServerRecord.self, DraftRecord.self, VisitRecord.self])
    let dir = URL.applicationSupportDirectory.appending(path: "run.fc.byre.mac", directoryHint: .isDirectory)
    do {
        try FileManager.default.createDirectory(at: dir, withIntermediateDirectories: true)
        return try ModelContainer(for: schema, configurations: ModelConfiguration(schema: schema, url: dir.appending(path: "byre.store"), cloudKitDatabase: .private("iCloud.run.fc.byre.mac")))
    } catch {
        fatalError("open persistent store: \(error)")
    }
}()

@MainActor
var persistence: ModelContext {
    container.mainContext
}

@MainActor
func fetchRecords<T: PersistentModel>(_ descriptor: FetchDescriptor<T>) -> [T] {
    do {
        return try persistence.fetch(descriptor)
    } catch {
        log.error("fetch \(String(describing: T.self), privacy: .public): \(String(describing: error), privacy: .public)")
        return []
    }
}

@MainActor
func saveRecords() {
    do {
        try persistence.save()
    } catch {
        log.error("save records: \(String(describing: error), privacy: .public)")
    }
}