add Workout, Exercise and their Library, Add, and Details views

WorkoutsPlus/Exercise/AddExercise.swift

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+//
+//  AddExercise.swift
+//  WorkoutsPlus
+//
+//  Created by Felix Förtsch on 18.08.24.
+//
+
+import SwiftUI
+
+struct AddExercise: View {
+		@Environment(\.modelContext) private var modelContext
+		@Environment(\.dismiss) private var dismiss
+		
+		@Bindable var exercise: Exercise
+		
+		var body : some View {
+				Form {
+						TextField("Workout Name", text: $exercise.name)
+				}
+				.toolbar {
+						ToolbarItem(placement: .cancellationAction) {
+								Button("Cancel") {
+										modelContext.delete(exercise)
+										dismiss()
+								}
+						}
+						ToolbarItem(placement: .confirmationAction) {
+								Button("Save") {
+										dismiss()
+								}
+						}
+				}
+		}
+}
+
+#Preview {
+		Color.clear
+				.sheet(isPresented: .constant(true)) {
+						AddExercise(exercise: Exercise(""))
+				}
+}

WorkoutsPlus/Exercise/Exercise.swift

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+//
+//  Item.swift
+//  WorkoutsPlus
+//
+//  Created by Felix Förtsch on 10.08.24.
+//
+
+import Foundation
+import SwiftData
+
+@Model
+final class Exercise {
+		var name: String
+		static var systemImage = "figure.run"
+		
+		var timestamp: Date
+		
+		init(_ name: String = "", timestamp: Date = Date.now) {
+				self.name = name
+				self.timestamp = timestamp
+		}
+		
+		static let sampleData = [
+				Exercise("Pull-up"),
+				Exercise("Push-up"),
+				Exercise("Dips"),
+				Exercise("Rows"),
+				Exercise("Split Squat")
+		]
+}

WorkoutsPlus/Exercise/ExerciseDetail.swift

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+//
+//  ExerciseDetailsView.swift
+//  WorkoutsPlus
+//
+//  Created by Felix Förtsch on 10.08.24.
+//
+
+import SwiftUI
+
+struct ExerciseDetail: View {
+		@Environment(\.dismiss) private var dismiss
+		@Environment(\.modelContext) private var modelContext
+		
+		@Bindable var exercise: Exercise
+		
+		var body: some View {
+				
+				Form {
+						TextField("Exercise Name", text: $exercise.name)
+								.toolbar {
+										ToolbarItem(placement: .topBarTrailing) {
+												Button("Save") {
+														saveItem()
+														dismiss()
+												}
+										}
+								}
+				}
+				.navigationTitle("Exercise Details")
+		}
+		
+		private func saveItem() {
+				if modelContext.hasChanges {
+						do {
+								try modelContext.save()
+						} catch {
+								print("Failed to save exercise: \(error.localizedDescription)")
+						}
+				}
+		}
+}
+
+#Preview {
+		ExerciseDetail(exercise: Exercise("New Exercise"))
+}

WorkoutsPlus/Exercise/ExerciseLibrary.swift

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+//
+//  ExerciseLibraryView.swift
+//  WorkoutsPlus
+//
+//  Created by Felix Förtsch on 10.08.24.
+//
+
+import SwiftUI
+import SwiftData
+
+struct ExerciseLibrary: View {
+		@Environment(\.modelContext) private var modelContext
+		@Query(sort: \Exercise.name) private var exercises: [Exercise]
+		
+		@State private var newExercise: Exercise?
+		
+		var body: some View {
+				NavigationSplitView {
+						Group {
+								if !exercises.isEmpty {
+										List {
+												ForEach(exercises) { exercise in
+														NavigationLink {
+																ExerciseDetail(exercise: exercise)
+														} label: {
+																Text(exercise.name)
+														}
+												}
+												.onDelete(perform: deleteExercise)
+										}
+								} else {
+										ContentUnavailableView {
+												Label("No Exercises", systemImage: Exercise.systemImage)
+										}
+								}
+						}
+						.navigationBarTitle("Exercises")
+						.toolbar {
+								ToolbarItem(placement: .topBarLeading) {
+										EditButton()
+								}
+								ToolbarItem {
+										Button(action: addExercise) {
+												Label("Add Exercise", systemImage: "plus")
+										}
+								}
+						}
+						.sheet(item: $newExercise) { exercise in
+								NavigationStack {
+										AddExercise(exercise: exercise)
+								}
+								// TODO: It's possible to add a boolean here ("Terms accepted y/n"). Maybe add this for empty string
+								.interactiveDismissDisabled()
+						}
+				} detail: {
+						// TODO: What does this Detail do?
+						Text("Select a workout")
+								.navigationTitle("Movie")
+				}
+		}
+		
+		private func addExercise() {
+				withAnimation {
+						let item = Exercise("")
+						modelContext.insert(item)
+						newExercise = item
+				}
+		}
+		
+		private func saveExercise(exercise: Exercise) {
+				if !exercise.name.isEmpty {
+						modelContext.insert(exercise)
+						try? modelContext.save()
+				}
+		}
+		
+		private func deleteExercise(offsets: IndexSet) {
+				withAnimation {
+						for index in offsets {
+								modelContext.delete(exercises[index])
+						}
+						try? modelContext.save()
+				}
+		}
+}
+
+#Preview("With Sample Data") {
+		ExerciseLibrary()
+				.modelContainer(SampleData.shared.modelContainer)
+}
+
+#Preview("Empty Database") {
+		ExerciseLibrary()
+				.modelContainer(for: Exercise.self, inMemory: true)
+}
+