workoutsplus/WorkoutsPlus/ContentView.swift

//
//  ContentView.swift
//  WorkoutsPlus
//
//  Created by Felix Förtsch on 10.08.24.
//

import SwiftUI
import SwiftData

struct ContentView: View {
		@Environment(\.modelContext) private var modelContext
		@Query private var exercises: [Exercise]
		
		@State private var isAddingNewExercise = false
		@State private var selectedExercise: Exercise?
		
		let initialDataSet = [
				"Pull-up",
				"Push-up",
				"Dips",
				"Rows",
				"Split Squat"
		]
		
		var body: some View {
				NavigationSplitView {
						List {
								ForEach(exercises) { exercise in
										NavigationLink {
												Text(exercise.name)
										} label: {
												Text(exercise.name)
										}
								}
								.onDelete(perform: deleteExercises)
						}
						.onAppear {
								if exercises.isEmpty {
										loadInitialData(exercises: initialDataSet)
								}
						}
						.toolbar {
								ToolbarItem(placement: .navigationBarTrailing) {
										Button {
												addExercise()
										} label: {
												Label("Add Exercise", systemImage: "plus")
										}
								}
						}
						.sheet(isPresented: $isAddingNewExercise) {
								ExerciseDetailsView(exercise: $selectedExercise, isEditing: false)
										.onDisappear {
												if let selectedExercise = selectedExercise, !selectedExercise.name.isEmpty {
														saveNewExercise()
												}
										}
						}
				} detail: {
						Text("Select an exercise")
				}
		}
		
		private func addExercise() {
				selectedExercise = Exercise(name: "")
				isAddingNewExercise = true
		}
		
		private func saveNewExercise() {
				guard let newExercise = selectedExercise else { return }
				modelContext.insert(newExercise)
				try? modelContext.save()
		}
		
		private func deleteExercises(offsets: IndexSet) {
				withAnimation {
						for index in offsets {
								modelContext.delete(exercises[index])
						}
						try? modelContext.save()
				}
		}
		
		private func loadInitialData(exercises: [String]) {
				var items: [Exercise] = []
				
				for exercise in exercises {
						let item = Exercise(name: exercise)
						items.append(item)
				}
				
				for item in items {
						modelContext.insert(item)
				}
				
				try? modelContext.save()
		}
}

#Preview {
		ContentView()
				.modelContainer(for: Exercise.self, inMemory: true)
}