//
//  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)
}