//
//  WorkoutDetailsView.swift
//  WorkoutsPlus
//
//  Created by Felix Förtsch on 10.08.24.
//

import SwiftUI
import SwiftData

struct WorkoutDetail: View {
		@Environment(\.dismiss) private var dismiss
		@Environment(\.modelContext) private var modelContext
		
		@Bindable var workout: Workout
		@State private var isPresenting = false
		
		var body: some View {
				
				Form {
						Section(header: Text("Workout Name")) {
								TextField("Workout Name", text: $workout.name)
						}
						Section(header: Text("Exercises")) {
								List {
										ForEach(workout.exercises) { exercise in
												ExerciseListItem(workout, exercise)
										}
										.onDelete(perform: deleteExerciseFromWorkout)
										.onMove(perform: move)
								}
								.environment(\.editMode, .constant(.active)) // Always active drag mode
								Button(action: addExerciseToWorkout) {
										Text("Add Exercise")
								}
						}
				}
				
				.navigationBarTitle("Edit \(workout.name)")
				.toolbar {
						ToolbarItem {
								EditButton()
						}
				}
				.sheet(isPresented: $isPresenting) {
						NavigationStack {
								AddExerciseToWorkout(workout: workout)
						}
						.presentationDetents([.medium, .large])
						.presentationDragIndicator(.visible)
				}
		}
		
		private func addExerciseToWorkout() {
				withAnimation {
						isPresenting = true
				}
		}
		
		private func saveWorkout() {
				if modelContext.hasChanges {
						do {
								try modelContext.save()
						} catch {
								print("Failed to save workout: \(error.localizedDescription)")
						}
				}
		}
		
		private func deleteExerciseFromWorkout(offsets: IndexSet) {
				withAnimation {
						for index in offsets {
								modelContext.delete(workout.exercises[index])
						}
						try? modelContext.save()
				}
		}
		
		private func move(from source: IndexSet, to destination: Int) {
				workout.exercises.move(fromOffsets: source, toOffset: destination)
		}
}

struct ExerciseListItem: View {
		var workout: Workout
		var exercise: Exercise
		
		init(_ workout: Workout, _ exercise: Exercise ) {
				self.workout = workout
				self.exercise = exercise
		}
		
		var body: some View {
				Button(action: {
//						workout.addExercise(from: 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: "info.circle")
						}
				}
		}
}

#Preview {
		NavigationStack {
				WorkoutDetail(workout: Workout.sampleData.first!)
				.modelContainer(SampleData.shared.modelContainer)
		}
}