workoutsplus/WorkoutsPlus/Workout/WorkoutLibrary.swift

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

import SwiftUI
import SwiftData

struct WorkoutLibrary: View {
		@Environment(\.modelContext) private var modelContext
		@Query(sort: \Workout.name) private var workouts: [Workout]
		
		@State private var newWorkout: Workout = Workout(name: "")
		@State private var newWorkoutName: String = ""
		@State private var isAddingWorkout: Bool = false
		@FocusState private var isInputFieldFocused: Bool
		
		@State private var searchText: String = ""
		var filteredItems: [Workout] {
				if searchText.isEmpty {
						return workouts
				} else {
						return workouts.filter { $0.name.localizedCaseInsensitiveContains(searchText) }
				}
		}
		
		var body: some View {
				NavigationView {
						Group {
								List {
										ForEach(filteredItems) { workout in
												NavigationLink {
														WorkoutDetail(workout: workout)
												} label: {
														Text(workout.name)
												}
										}
										.onDelete(perform: deleteWorkout)
										if isAddingWorkout {
												// TODO: On tap-out of the text field, it should lose focus
												TextField("New Workout", text: $newWorkoutName, onCommit: {
														saveWorkout(workout: newWorkout)
												})
												.textInputAutocapitalization(.words)
												.focused($isInputFieldFocused)
										}
										Button(action: {
												if isAddingWorkout {
														saveWorkout(workout: newWorkout)
												}
												addWorkout()
										}) {
												HStack {
														Image(systemName: "plus.circle.fill")
																.foregroundStyle(.green)
														Text("Add Workout")
												}
										}
								}
								.searchable(text: $searchText)
						}
						.navigationBarTitle("Workouts")
						.toolbar {
								ToolbarItem() {
										EditButton()
								}
						}
				}
		}
		
		private func addWorkout() {
				withAnimation {
						newWorkout = Workout(name: "")
						newWorkoutName = ""
						isAddingWorkout = true
						isInputFieldFocused = true
				}
		}
		
		// TODO: Brauchen wir das?
		private func saveWorkout(workout: Workout) {
				withAnimation {
						newWorkout.name = newWorkoutName
						if !workout.name.isEmpty {
								modelContext.insert(workout)
								try? modelContext.save()
						}
						isAddingWorkout = false
				}
		}
		
		private func deleteWorkout(offsets: IndexSet) {
				withAnimation {
						for index in offsets {
								modelContext.delete(workouts[index])
						}
						try? modelContext.save()
				}
		}
}

#Preview("With Sample Data") {
		WorkoutLibrary()
				.modelContainer(SampleData.shared.modelContainer)
}

#Preview("Empty Database") {
		WorkoutLibrary()
				.modelContainer(for: Workout.self, inMemory: true)
}