//
//  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?

		var body: some View {
				NavigationSplitView {
						Group {
								if !workouts.isEmpty {
										List {
												ForEach(workouts) { workout in
														NavigationLink {
																WorkoutDetail(workout: workout)
														} label: {
																Text(workout.name)
														}
												}
												.onDelete(perform: deleteWorkout)
										}
								} else {
										ContentUnavailableView {
												Label("No Workouts", systemImage: "figure.run.square.stack")
										}
								}
						}
						.navigationBarTitle("Workouts")
						.toolbar {
								ToolbarItem(placement: .topBarLeading) {
										EditButton()
								}
								ToolbarItem {
										Button(action: addWorkout) {
												Label("Add Workout", systemImage: "plus")
										}
								}
						}
						.sheet(item: $newWorkout) { workout in
								NavigationStack {
										AddWorkout(workout: workout)
								}
								.interactiveDismissDisabled()
						}
				} detail: {
						// TODO: What does this Detail do?
						Text("Select a workout")
								.navigationTitle("Movie")
				}
		}
		
		private func addWorkout() {
				withAnimation {
						let item = Workout(name: "")
						modelContext.insert(item)
						newWorkout = item
				}
		}
		
		// TODO: Brauchen wir das?
		private func saveWorkout(workout: Workout) {
				if !workout.name.isEmpty {
						modelContext.insert(workout)
						try? modelContext.save()
				}
		}
		
		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)
}