add draft views for sets of exercises

WorkoutsPlus/Workout/AddWorkoutItemToWorkout.swift

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+//
+//  AddExerciseToWorkout.swift
+//  WorkoutsPlus
+//
+//  Created by Felix Förtsch on 22.08.24.
+//
+
+import SwiftUI
+import SwiftData
+
+struct AddWorkoutItemToWorkout: View {
+		@Environment(\.modelContext) private var modelContext
+		@Query(sort: \Exercise.name) private var exercises: [Exercise]
+		
+		@Bindable var workout: Workout
+		
+		var body: some View {
+				Group {
+						List {
+								Section(header: Text("Utilities")) {
+										AddExerciseToWorkoutListItem(WorkoutItem(workoutItems: []), workout)
+								}
+								Section(header: Text("Excersises")) {
+										if !exercises.isEmpty {
+												ForEach(exercises) { exercise in
+														
+														AddExerciseToWorkoutListItem(WorkoutItem(from: exercise), workout)
+												}} else {
+														ContentUnavailableView {
+																// TODO: Add Button that allows adding an exercise
+																Label("No Exercises", systemImage: Exercise.systemImage)
+														}
+												}
+								}
+						}
+				}
+		}
+}
+
+struct AddExerciseToWorkoutListItem: View {
+		@Environment(\.modelContext) private var modelContext
+		
+		var workoutItem: WorkoutItem
+		var workout: Workout
+		
+		init(_ workoutItem: WorkoutItem, _ workout: Workout) {
+				self.workoutItem = workoutItem
+				self.workout = workout
+		}
+		
+		var body: some View {
+				Button(action: {
+						workout.add(workoutItem: workoutItem)
+				}) {
+						HStack {
+								Text(workoutItem.name)
+										.foregroundStyle(.black)
+								Spacer()
+								Image(systemName: "plus.circle.fill")
+										.foregroundStyle(.green)
+						}
+				}
+		}
+}
+
+#Preview("With Sample Data") {
+		AddWorkoutItemToWorkout(workout: Workout.sampleData)
+				.modelContainer(SampleData.shared.modelContainer)
+}
+
+#Preview("Empty Database") {
+		AddWorkoutItemToWorkout(workout: Workout.sampleData)
+				.modelContainer(for: Exercise.self, inMemory: true)
+}