//
//  AddExercise.swift
//  WorkoutsPlus
//
//  Created by Felix Förtsch on 21.09.24.
//

import SwiftUI
import SwiftData

struct ExerciseEditor: View {
		@Environment(\.modelContext) private var modelContext
		@Environment(\.dismiss) private var dismiss
		var isPresentedAsSheet: Bool = false
		
		@State var exercise: Exercise?
		
		@State private var name: String = ""
		@State private var description: String = ""
		@State private var metric = ExerciseMetric.none
		@State private var unit = ExerciseUnit(name: "", symbol: "")
		
		@State private var isPartOfProgression: Bool = false
		
		let exerciseUnits = ExerciseUnit.getUnits
		
		var body: some View {
				NavigationStack {
						VStack {
								ScrollViewReader { proxy in
										VStack {
												Form {
														Section {
																TextField("Exercise Name", text: $name)
																// TODO: Add Autocomplete
																TextEditorWithPlaceholder(text: $description, placeholder: "Description (optional)")
														}
														Section(footer: Text("""
																																		Examples:
																																		• Pull-up → None
																																		• Weighted Pull-up → Weight 
																																		• Sprint → Time or Distance
																																		""")) {
																Picker("Exercise Metric", selection: $metric) {
																		ForEach(ExerciseMetric.allCases) { metric in
																				Text(metric.rawValue.isEmpty ? "None" : metric.rawValue)
																						.tag(metric)
																		}
																}
																.pickerStyle(SegmentedPickerStyle())
																Picker("Select Exercise Unit", selection: $unit) {
																		ForEach(exerciseUnits, id: \.self) { unit in
																				Text("\(unit.name) (\(unit.symbol))").tag(unit as ExerciseUnit?)
																		}
																}
																.pickerStyle(NavigationLinkPickerStyle())
														}
														Section(footer: Text("Feature coming soon.")) {
																Toggle(isOn: $isPartOfProgression) {
																		Text("Exercise is Part of a Progression")
																				.foregroundStyle(.gray)
																}
																.disabled(true)
														}
												}
												.navigationTitle("Edit")
												.toolbar {
														if isPresentedAsSheet {
																ToolbarItem(placement: .cancellationAction) {
																		Button("Cancel", role: .cancel) {
																				dismiss()
																		}
																}
														}
														ToolbarItem(placement: .confirmationAction) {
																Button("Save") {
																		withAnimation {
																				save()
																				dismiss()
																		}
																}
														}
												}
										}
										.onAppear {
												if let exercise {
														self.name = exercise.name
														self.description = exercise.exerciseDescription
														self.metric = exercise.metric
														self.isPartOfProgression = exercise.isPartOfProgression
												}
										}
								}
						}
				}
		}
		
		private func save() {
				let exerciseToSave: Exercise
				
				if let exercise = exercise {
						exerciseToSave = exercise
				} else {
						exerciseToSave = Exercise(name)
						modelContext.insert(exerciseToSave)
				}
				
				exerciseToSave.name = name
				exerciseToSave.exerciseDescription = description
				exerciseToSave.metric = metric
				exerciseToSave.isPartOfProgression = isPartOfProgression
		}
}

#Preview {
		ExerciseEditor()
}