//
//  ActiveWorkoutSession.swift
//  WorkoutsPlus
//
//  Created by Felix Förtsch on 12.09.24.
//

import SwiftUI
import SwiftData

// This view can only be viewed, if there exists a WorkoutSession that can be considered active (a person working out).
struct ActiveWorkoutSession: View {
		@Environment(WorkoutStateManager.self) private var workoutStateManager
		@EnvironmentObject private var navigationManager: NavigationManager
		
		var body: some View {
				if let session = workoutStateManager.activeWorkoutSession {
						VStack {
								List {
										Section {
												ForEach(session.workoutSessionItems.reversed()) { workoutSessionItem in
														ActiveWorkoutSessionListItem(workoutSessionItem: workoutSessionItem)
												}
										}
								}
								.listStyle(.plain)
								ActiveWorkoutSessionControls()
										.frame(height: 200)
						}
						.background(.bar)
						.toolbar {
								if workoutStateManager.isWorkoutInProgress {
										Button(action: {
												workoutStateManager.stopWorkout()
												navigationManager.popToRoot()
										}) {
												HStack {
														Image(systemName: "stop.fill")
														Text("Stop")
												}
										}
										.fontWeight(.bold)
										.fontDesign(.rounded)
										.tint(.red)
								}
						}
				} else {
						ContentUnavailableView {
								Label("No Session in Progress ", systemImage: WorkoutSession.systemImage)
						} description: {
								Text("Start a session to track your progress.")
						}
				}			
		}
		// .navigationTitle(session.name)
		// .navigationBarTitleDisplayMode(.inline)
		
		private func getActiveWorkoutItems(activeWorkout: Workout?) -> [WorkoutItem] {
				guard let activeWorkout else { return [] }
				return activeWorkout.getWorkoutItems()
		}
		
		private func getItem<Item: Nameable>(from array: [Item], by id: String) -> Item? {
				let filteredItems = array.filter { $0.id == UUID(uuidString: id) }
				return filteredItems.count == 1 ? filteredItems.first : nil
		}
}


#Preview("Active Session") {
		@Previewable @State var stateManager = WorkoutStateManager(modelContext: SampleData.shared.modelContainer.mainContext)
		
		let _ = {
				stateManager.startWorkout(Workout.sampleData.first!)
		}()
		
		NavigationStack {
				ActiveWorkoutSession()
		}
		.modelContainer(SampleData.shared.modelContainer)
		.environment(stateManager)
}

#Preview("No Session (should never be displayed)") {
		@Previewable @State var stateManager = WorkoutStateManager(modelContext: SampleData.shared.modelContainer.mainContext)
		
		NavigationStack {
				ActiveWorkoutSession()
		}
		.modelContainer(SampleData.shared.modelContainer)
		.environment(stateManager)
}