add UI for adding exercises to workouts

WorkoutsPlus/Workout/AddExerciseToWorkout.swift

@@ -0,0 +1,84 @@
+//
+//  AddExerciseToWorkout.swift
+//  WorkoutsPlus
+//
+//  Created by Felix Förtsch on 22.08.24.
+//
+
+import SwiftUI
+import SwiftData
+
+struct AddExerciseToWorkout: View {
+		@Environment(\.modelContext) private var modelContext
+		@Query(sort: \Exercise.name) private var exercises: [Exercise]
+		
+		@Bindable var workout: Workout
+		
+		var selectedExercises: [Exercise] = [Exercise("Selected")]
+		
+		var body: some View {
+				Group {
+						if !exercises.isEmpty {
+								List {
+										Section(header: Text("Utility")) {
+												// TODO: Loop, Warm-up, Cool-down are not unique yet. They are special utility types
+												AddExerciseToWorkoutListItem(Exercise("Loop"), workout)
+												AddExerciseToWorkoutListItem(Exercise("Warm-up"),workout)
+												AddExerciseToWorkoutListItem(Exercise("Cool-down"),workout)
+										}
+										Section(header: Text("Excersises")) {
+												ForEach(exercises) { exercise in
+														AddExerciseToWorkoutListItem(exercise, workout)
+												}
+										}
+								}
+						} else {
+								ContentUnavailableView {
+										// TODO: Add Button that allows adding an exercise
+										Label("No Exercises", systemImage: Exercise.systemImage)
+								}
+						}
+				}
+		}
+}
+
+struct AddExerciseToWorkoutListItem: View {
+		var exercise: Exercise
+		var workout: Workout
+		
+		init(_ exercise: Exercise, _ workout: Workout) {
+				self.exercise = exercise
+				self.workout = workout
+		}
+		
+		var body: some View {
+				Button(action: {
+						workout.addExercise(exercise)
+				}) {
+						HStack {
+								Text(String(workout.exercises.filter { $0 == exercise }.count))
+										.font(.system(size: 14, weight: .bold))
+										.foregroundColor(.white)
+										.frame(width: 20, height: 10)
+										.padding(8)
+										.background(Color.blue)
+										.clipShape(RoundedRectangle(cornerRadius: 8))
+								Text(exercise.name)
+										.foregroundColor(.black)
+								Spacer()
+								Image(systemName: "plus.circle.fill")
+										.foregroundColor(.green)
+						}
+				}
+		}
+}
+
+#Preview("With Sample Data") {
+		AddExerciseToWorkout(workout: Workout(name: "New Workout"))
+				.modelContainer(SampleData.shared.modelContainer)
+}
+
+#Preview("Empty Database") {
+		AddExerciseToWorkout(workout: Workout(name: "New Workout"))
+				.modelContainer(for: Exercise.self, inMemory: true)
+}