//
//  WorkoutDetail.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
		
		@Default(\.isWorkingOut) var isWorkingOut
		
		@Binding var activeWorkoutSession: WorkoutSession?
		
		@State var workout: Workout
		@State private var isPresentingWorkoutItemLibrarySheet = false
		
		var numberFormatter: NumberFormatter {
				let f = NumberFormatter()
				f.numberStyle = .decimal
				f.maximumFractionDigits = 0
				return f
		}
		
		@State var value: Decimal? =  60
		@State var textFieldIsActive: Bool = false
		
		@State var defaultRestTime: Double = 45
		
		@State private var selectedMinutes = 0
		@State private var selectedSeconds = 0
		
		var body: some View {
				List {
						Section(
								content: {
										NavigationLink(destination: WorkoutIconSelector(workout: workout)) {
												TextField("Workout Name", text: $workout.name)
												Image(systemName: workout.workoutIconSystemName)
														.scaledToFit()
														.foregroundStyle(workout.workoutIconColorName.color)
										}
										HStack {
												Text("Default Rest Time (min:s)")
												Spacer()
												// TODO: This is f-in horrible. But I need a break rn.
												NumbersOnlyTextField(value: $defaultRestTime)
										}
								},
								header: { Text("Name & Icon") },
								footer: { Text("Setting a Default Rest Time inserts the time between each exercise.") })
						Section(
								header: Text("Exercises"),
								footer: Text("Drag and drop to re-arrange or swipe to delete exercises.")) {
										ForEach(workout.getWorkoutItems()) { workoutItem in
												WorkoutListItem(workout, workoutItem)
										}
										.onDelete(perform: deleteWorkoutItem)
										.onMove(perform: move)
										.environment(\.editMode, .constant(.active)) // Always active drag mode
										AddItemButton(label: "Exercise", action: presentWorkoutItemLibrarySheet)
								}
				}
				.navigationTitle("\(workout.name)")
				.toolbar {
						// TODO: Add proper Sharing for workouts.
//						ToolbarItem() { ShareLink(item: URL(filePath: "felixfoertsch.de")!) }
						if (isWorkingOut) {
								Button(action: {
										isWorkingOut = false
										activeWorkoutSession?.stop()
								}) {
										HStack {
												Image(systemName: "stop.fill")
												Text("Stop")
										}
								}
								.bold()
								.fontDesign(.rounded)
								.tint(.red)
						}
						else {
								Button(action: {
										isWorkingOut = true
										activeWorkoutSession = workout.start()
								}) {
										HStack {
												Image(systemName: "play.fill")
												Text("Start")
										}
								}
								.bold()
								.fontDesign(.rounded)
								.tint(.green)
						}
				}
				.sheet(isPresented: $isPresentingWorkoutItemLibrarySheet) {
						WorkoutItemLibrarySheet(workout: workout)
				}
		}
		
		private func presentWorkoutItemLibrarySheet() {
				withAnimation {
						isPresentingWorkoutItemLibrarySheet = true
				}
		}
		
		private func saveWorkout() {
				if modelContext.hasChanges {
						do {
								try modelContext.save()
						} catch {
								print("Failed to save workout: \(error.localizedDescription)")
						}
				}
		}
		
		private func deleteWorkoutItem(offsets: IndexSet) {
				withAnimation {
						for index in offsets {
								modelContext.delete(workout.getWorkoutItems()[index])
						}
						try? modelContext.save()
				}
		}
		
		private func move(from source: IndexSet, to destination: Int) {
				workout.moveWorkoutItem(from: source, to: destination)
		}
}

#Preview {
		@Previewable @State var activeWorkoutSession: WorkoutSession?
		
		NavigationStack {
				WorkoutDetail(activeWorkoutSession: $activeWorkoutSession, workout: Workout.sampleData.first!)
						.modelContainer(SampleData.shared.modelContainer)
		}
}

#Preview("Debug") {
		@Previewable @State var activeWorkoutSession: WorkoutSession?
		
		TabView {
				WorkoutDetail(activeWorkoutSession: $activeWorkoutSession, workout: Workout.sampleData.first!)
						.tabItem {
								Image(systemName: "figure.run.square.stack")
								Text("Workouts")
						}
				
				DebugList()
						.tabItem {
								Image(systemName: "hammer")
								Text("Debug")
						}
		}
		.modelContainer(SampleData.shared.modelContainer)
}