workouts/Workouts/Models/Exercise.swift

import Foundation
import CoreData

@objc(Exercise)
public class Exercise: NSManagedObject, Identifiable {
    @NSManaged public var name: String
    @NSManaged public var loadType: Int32
    @NSManaged public var order: Int32
    @NSManaged public var sets: Int32
    @NSManaged public var reps: Int32
    @NSManaged public var weight: Int32
    @NSManaged public var duration: Date?
    @NSManaged public var weightLastUpdated: Date?
    @NSManaged public var weightReminderTimeIntervalWeeks: Int32

    @NSManaged public var split: Split?

    public var id: NSManagedObjectID { objectID }

    var loadTypeEnum: LoadType {
        get { LoadType(rawValue: Int(loadType)) ?? .weight }
        set { loadType = Int32(newValue.rawValue) }
    }

    // Duration helpers for minutes/seconds conversion
    var durationMinutes: Int {
        get {
            guard let duration = duration else { return 0 }
            return Int(duration.timeIntervalSince1970) / 60
        }
        set {
            let seconds = durationSeconds
            duration = Date(timeIntervalSince1970: TimeInterval(newValue * 60 + seconds))
        }
    }

    var durationSeconds: Int {
        get {
            guard let duration = duration else { return 0 }
            return Int(duration.timeIntervalSince1970) % 60
        }
        set {
            let minutes = durationMinutes
            duration = Date(timeIntervalSince1970: TimeInterval(minutes * 60 + newValue))
        }
    }
}

// MARK: - Fetch Request

extension Exercise {
    @nonobjc public class func fetchRequest() -> NSFetchRequest<Exercise> {
        return NSFetchRequest<Exercise>(entityName: "Exercise")
    }

    static func orderedFetchRequest(for split: Split) -> NSFetchRequest<Exercise> {
        let request = fetchRequest()
        request.predicate = NSPredicate(format: "split == %@", split)
        request.sortDescriptors = [NSSortDescriptor(keyPath: \Exercise.order, ascending: true)]
        return request
    }
}


enum LoadType: Int, CaseIterable {
    case none = 0
    case weight = 1
    case duration = 2

    var name: String {
        switch self {
        case .none: "None"
        case .weight: "Weight"
        case .duration: "Duration"
        }
    }
}