//
//  AddEventView.swift
//  MacNearFuture
//
//  Created by neon443 on 11/06/2025.
//

import SwiftUI
import SFSymbolsPicker

struct AddEventView: View {
	@ObservedObject var viewModel: EventViewModel
	
	@Binding var event: Event
	
	@State var adding: Bool
	@State var showNeedsNameAlert: Bool = false
	@State var isSymbolPickerPresented: Bool = false
	
	@State private var bye: Bool = false
	
	@FocusState private var focusedField: Field?
	private enum Field {
		case Name, Notes
	}
	
	@Environment(\.dismiss) var dismiss
	
	var body: some View {
		ZStack {
			if !adding {
				backgroundGradient
			}
			List {
				Section(
					header:
						Text("Event Details")
						.font(.headline)
						.foregroundColor(.accentColor)
				) {
					// name & symbol
					HStack(spacing: 5) {
						Button() {
							isSymbolPickerPresented.toggle()
						} label: {
							Image(systemName: event.symbol)
								.resizable()
								.scaledToFit()
								.frame(width: 20, height: 20)
								.foregroundStyle(event.color.color)
						}
						.frame(width: 20)
						.buttonStyle(.borderless)
						.sheet(isPresented: $isSymbolPickerPresented) {
							SymbolsPicker(
								selection: $event.symbol,
								title: "Choose a Symbol",
								searchLabel: "Search...",
								autoDismiss: true)
							.presentationDetents([.medium])
						}
						
						// dscription
						ZStack {
							TextField("Event Notes", text: $event.notes)
								.textFieldStyle(RoundedBorderTextFieldStyle())
								.padding(.trailing, event.notes.isEmpty ? 0 : 30)
								.animation(.spring, value: event.notes)
								.focused($focusedField, equals: Field.Notes)
								.submitLabel(.done)
								.onSubmit {
									focusedField = nil
								}
							//							MagicClearButton(text: $eventNotes)
						}
						
						
						// date picker
						HStack {
							Spacer()
							DatePicker("", selection: $event.date, displayedComponents: .date)
							Spacer()
							Button() {
								event.date = Date()
							} label: {
								Image(systemName: "arrow.uturn.left")
									.resizable()
									.scaledToFit()
							}
							.buttonStyle(BorderlessButtonStyle())
							.frame(width: 20)
						}
						
						DatePicker(
							"",
							selection: $event.date,
							displayedComponents: .hourAndMinute
						)
						
						// re-ocurrence Picker
						Picker("Recurrence", selection: $event.recurrence) {
							ForEach(Event.RecurrenceType.allCases, id: \.self) { recurrence in
								Text(recurrence.rawValue.capitalized)
							}
						}
						.pickerStyle(SegmentedPickerStyle())
						Text(
							describeOccurrence(
								date: event.date,
								recurrence: event.recurrence
							)
						)
					}
				}
				.scrollContentBackground(.hidden)
				.navigationTitle("\(adding ? "Add Event" : "")")
				.toolbar {
					ToolbarItem() {
						if adding {
							Button() {
								resetAddEventView()
								dismiss()
							} label: {
								Image(systemName: "xmark")
									.resizable()
									.scaledToFit()
									.frame(width: 30)
							}
						}
					}
					ToolbarItem/*(placement: .topBarTrailing)*/ {
						if adding {
							Button {
								viewModel.addEvent(
									newEvent: event
								)
								bye.toggle()
								resetAddEventView()
							} label: {
								Text("Save")
									.font(.headline)
									.cornerRadius(10)
									.buttonStyle(BorderedProminentButtonStyle())
							}
							.tint(.accent)
							.apply {
								if #available(iOS 17, *) {
									$0.sensoryFeedback(.success, trigger: bye)
								}
							}
							.disabled(event.name.isEmpty)
							.onTapGesture {
								if event.name.isEmpty {
									showNeedsNameAlert.toggle()
								}
							}
							.alert("Missing Name", isPresented: $showNeedsNameAlert) {
								Button("OK", role: .cancel) {
									showNeedsNameAlert.toggle()
									focusedField = .Name
								}
							} message: {
								Text("Give your Event a name before saving.")
							}
							if event.name.isEmpty {
								HStack {
									Image(systemName: "exclamationmark")
										.foregroundStyle(.red)
									Text("Give your event a name.")
								}
							}
						}
					}
				}
			}
			.scrollContentBackground(.hidden)
			.presentationDragIndicator(.visible)
		}
	}
	func resetAddEventView() {
		//reset addeventView
		event = viewModel.template
		dismiss()
	}
	
}

#Preview {
	let vm = dummyEventViewModel()
	Color.orange
		.ignoresSafeArea(.all)
		.sheet(isPresented: .constant(true)) {
			AddEventView(
				viewModel: vm,
				event: .constant(vm.template),
				adding: true
			)
		}
}