workoutsplus/WorkoutsPlus/WorkoutLibraryView.swift

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

import SwiftUI
import SwiftData

struct WorkoutLibraryView: View {
		@Environment(\.modelContext) private var modelContext
		@Query private var workouts: [Workout]
		
		@State private var isPresentingNewItemSheet = false
		
		let initialDataSet = [
				"RR",
				"Minimalist"
		]
		
		var body: some View {
				NavigationView {
						List {
								ForEach(workouts.sorted(by: { $0.name < $1.name })) { workout in
										NavigationLink(destination: WorkoutDetailsView(workout: workout)) {
												Text(workout.name)
										}
								}
								.onDelete(perform: deleteWorkout)
						}
						.onAppear {
								if workouts.isEmpty {
										// TODO: This behaviour puts something into [workouts] whenever(!) it is empty. It's not bound to the first ever start of the app or anything. Check if that's the behaviour we want.
										loadInitialData(workouts: initialDataSet)
								}
						}
						.toolbar {
								ToolbarItem(placement: .navigationBarTrailing) {
										Button {
												createNewWorkout()
										} label: {
												Label("Add Workout", systemImage: "plus")
										}
								}
						}
						.sheet(isPresented: $isPresentingNewItemSheet) {
								let newWorkout = Workout(name: "")
								NavigationView {
										WorkoutDetailsView(workout: newWorkout, isPresentedAsSheet: true)
												.onDisappear {
														if !newWorkout.name.isEmpty {
																saveWorkout(workout: newWorkout)
														}
												}
								}
						}
				}
		}
		
		private func createNewWorkout() {
				isPresentingNewItemSheet = true
		}
		
		private func saveWorkout(workout: Workout) {
				modelContext.insert(workout)
				try? modelContext.save()
		}
		
		private func deleteWorkout(offsets: IndexSet) {
				withAnimation {
						for index in offsets {
								modelContext.delete(workouts[index])
						}
						try? modelContext.save()
				}
		}
		
		private func loadInitialData(workouts: [String]) {
				var items: [Workout] = []
				
				for exercise in workouts {
						let item = Workout(name: exercise)
						items.append(item)
				}
				
				for item in items {
						modelContext.insert(item)
				}
				
				try? modelContext.save()
		}
}

#Preview {
		WorkoutLibraryView()
				.modelContainer(for: Workout.self, inMemory: true)
}