import Foundation
import CoreData
import SwiftUI

@objc(Split)
public class Split: NSManagedObject, Identifiable {
    @NSManaged public var name: String
    @NSManaged public var color: String
    @NSManaged public var systemImage: String
    @NSManaged public var order: Int32

    @NSManaged public var exercises: NSSet?
    @NSManaged public var workouts: NSSet?

    public var id: NSManagedObjectID { objectID }

    static let unnamed = "Unnamed Split"
}

// MARK: - Convenience Accessors

extension Split {
    var exercisesArray: [Exercise] {
        let set = exercises as? Set<Exercise> ?? []
        return set.sorted { $0.order < $1.order }
    }

    var workoutsArray: [Workout] {
        let set = workouts as? Set<Workout> ?? []
        return set.sorted { $0.start > $1.start }
    }

    func addToExercises(_ exercise: Exercise) {
        let items = mutableSetValue(forKey: "exercises")
        items.add(exercise)
    }

    func removeFromExercises(_ exercise: Exercise) {
        let items = mutableSetValue(forKey: "exercises")
        items.remove(exercise)
    }

    func addToWorkouts(_ workout: Workout) {
        let items = mutableSetValue(forKey: "workouts")
        items.add(workout)
    }

    func removeFromWorkouts(_ workout: Workout) {
        let items = mutableSetValue(forKey: "workouts")
        items.remove(workout)
    }
}

// MARK: - Fetch Request

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

    static func orderedFetchRequest() -> NSFetchRequest<Split> {
        let request = fetchRequest()
        request.sortDescriptors = [NSSortDescriptor(keyPath: \Split.order, ascending: true)]
        return request
    }
}