introduce WorkoutItem, refactor ExerciseTemplate to Exercise

WorkoutsPlus/Workout/WorkoutItem.swift

@@ -0,0 +1,66 @@
+//
+//  Exercise.swift
+//  WorkoutsPlus
+//
+//  Created by Felix Förtsch on 10.08.24.
+//
+
+import Foundation
+import SwiftData
+
+@Model
+final class WorkoutItem: Identifiable {
+		var id = UUID()
+		var name: String
+		var workoutItemType: WorkoutItemType
+		
+		var workout: Workout?
+		var children: [WorkoutItem] = []
+		var position: Int = 0
+		
+		var exercise: Exercise? {
+				didSet {
+						self.name = exercise?.name ?? "self.name"
+				}
+		}
+		var reps: Int = 0
+		
+		init(_ reps: Int, _ exercise: String) {
+				self.workoutItemType = .exercise
+				
+				self.name = exercise
+				self.reps = reps
+				self.exercise = Exercise(exercise)
+		}
+		
+		init(from exercise: Exercise) {
+				self.workoutItemType = .exercise
+				
+				self.name = exercise.name
+				self.exercise = exercise
+		}
+		
+		func addChild(_ child: WorkoutItem) {
+				self.children.append(child)
+		}
+}
+
+extension WorkoutItem {
+		enum WorkoutItemType: Codable {
+				case set
+				case workout
+				case exercise
+		}
+}
+
+extension WorkoutItem {
+		static let sampleData: [WorkoutItem] = {
+				var exercises = [WorkoutItem]()
+				
+				for exercise in Exercise.sampleData {
+						exercises.append(WorkoutItem(from: exercise))
+				}
+				
+				return exercises
+		}()
+}