//
//  AddExerciseToWorkout.swift
//  WorkoutsPlus
//
//  Created by Felix Förtsch on 22.08.24.
//

import SwiftUI
import SwiftData

struct AddWorkoutItemToWorkout: View {
		@Environment(\.modelContext) private var modelContext
		@Query(sort: \Exercise.name) private var exercises: [Exercise]
		
		@Bindable var workout: Workout
		
		var body: some View {
				Group {
						List {
								Section(header: Text("Utilities")) {
										AddExerciseToWorkoutListItem(WorkoutItem(workoutItems: []), workout)
								}
								Section(header: Text("Excersises")) {
										if !exercises.isEmpty {
												ForEach(exercises) { exercise in
														
														AddExerciseToWorkoutListItem(WorkoutItem(from: exercise), workout)
												}} else {
														ContentUnavailableView {
																// TODO: Add Button that allows adding an exercise
																Label("No Exercises", systemImage: Exercise.systemImage)
														}
												}
								}
						}
				}
		}
}

struct AddExerciseToWorkoutListItem: View {
		@Environment(\.modelContext) private var modelContext
		
		var workoutItem: WorkoutItem
		var workout: Workout
		
		init(_ workoutItem: WorkoutItem, _ workout: Workout) {
				self.workoutItem = workoutItem
				self.workout = workout
		}
		
		var body: some View {
				Button(action: {
						workout.add(workoutItem: workoutItem)
				}) {
						HStack {
								Text(workoutItem.name)
										.foregroundStyle(.black)
								Spacer()
								Image(systemName: "plus.circle.fill")
										.foregroundStyle(.green)
						}
				}
		}
}

#Preview("With Sample Data") {
		AddWorkoutItemToWorkout(workout: Workout.sampleData)
				.modelContainer(SampleData.shared.modelContainer)
}

#Preview("Empty Database") {
		AddWorkoutItemToWorkout(workout: Workout.sampleData)
				.modelContainer(for: Exercise.self, inMemory: true)
}