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

import SwiftUI
import SwiftData

struct AddExerciseToWorkout: View {
		@Environment(\.modelContext) private var modelContext
		@Query(sort: \Exercise.name) private var exercises: [Exercise]
		
		@Bindable var workout: Workout
		
		var selectedExercises: [Exercise] = [Exercise("Selected")]
		
		var body: some View {
				Group {
						if !exercises.isEmpty {
								List {
										Section(header: Text("Utility")) {
												// TODO: Loop, Warm-up, Cool-down are not unique yet. They are special utility types
												AddExerciseToWorkoutListItem(Exercise("Loop"), workout)
												AddExerciseToWorkoutListItem(Exercise("Warm-up"),workout)
												AddExerciseToWorkoutListItem(Exercise("Cool-down"),workout)
										}
										Section(header: Text("Excersises")) {
												ForEach(exercises) { exercise in
														AddExerciseToWorkoutListItem(exercise, workout)
												}
										}
								}
						} else {
								ContentUnavailableView {
										// TODO: Add Button that allows adding an exercise
										Label("No Exercises", systemImage: Exercise.systemImage)
								}
						}
				}
		}
}

struct AddExerciseToWorkoutListItem: View {
		var exercise: Exercise
		var workout: Workout
		
		init(_ exercise: Exercise, _ workout: Workout) {
				self.exercise = exercise
				self.workout = workout
		}
		
		var body: some View {
				Button(action: {
						workout.addExercise(exercise)
				}) {
						HStack {
								Text(String(workout.exercises.filter { $0 == exercise }.count))
										.font(.system(size: 14, weight: .bold))
										.foregroundColor(.white)
										.frame(width: 20, height: 10)
										.padding(8)
										.background(Color.blue)
										.clipShape(RoundedRectangle(cornerRadius: 8))
								Text(exercise.name)
										.foregroundColor(.black)
								Spacer()
								Image(systemName: "plus.circle.fill")
										.foregroundColor(.green)
						}
				}
		}
}

#Preview("With Sample Data") {
		AddExerciseToWorkout(workout: Workout(name: "New Workout"))
				.modelContainer(SampleData.shared.modelContainer)
}

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