//
//  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 = Exercise("")
		@State private var newExerciseName: String = ""
		@State private var isAddingExercise: Bool = false
		@FocusState private var isInputFieldFocused: Bool
		
		@State private var searchText: String = ""
		var filteredItems: [Exercise] {
				if searchText.isEmpty {
						return exercises
				} else {
						return exercises.filter { $0.name.localizedCaseInsensitiveContains(searchText) }
				}
		}
		
		var body: some View {
				Group {
						List {
								Section {
										ForEach(filteredItems) { exercise in
												NavigationLink(destination: ExerciseEditor(exercise: exercise), label: {Text(exercise.name)})
										}
										.onDelete(perform: deleteExercise)
										if filteredItems.isEmpty {
												ContentUnavailableView.search(text: searchText)
										}
								}
								Section {
										AddItemButton(label: "Exercise", action: addExercise)
								}
						}
						.searchable(text: $searchText)
				}
				.navigationTitle("Exercises")
				.toolbar {
						ToolbarItem {
								EditButton()
						}
						ToolbarItem {
								Button(action: addExercise) {
										Image(systemName: "plus")
								}
						}
				}
				.sheet(isPresented: $isAddingExercise) {
						AddExercise(isPresentedAsSheet: true)
				}
		}
		
		private func addExercise() {
				withAnimation {
						isAddingExercise = true
						isInputFieldFocused = true
				}
		}
		
		private func deleteExercise(offsets: IndexSet) {
				withAnimation {
						for index in offsets {
								modelContext.delete(exercises[index])
						}
						try? modelContext.save()
				}
		}
}

#Preview {
		ModelContainerPreview(ModelContainer.sample) {
				NavigationStack {
						ExerciseLibrary()
				}
		}
}

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

#Preview("Empty Database") {
		NavigationStack {
				ExerciseLibrary()
		}
		.modelContainer(for: WorkoutItem.self, inMemory: true)
}