/*
 * Copyright (c) 2010-2023 Belledonne Communications SARL.
 *
 * This file is part of linphone-iphone
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

import SwiftUI

// swiftlint:disable line_length
struct RegisterCodeConfirmationFragment: View {
	@ObservedObject private var sharedMainViewModel = SharedMainViewModel.shared
	@ObservedObject var registerViewModel: RegisterViewModel
	
	@Environment(\.dismiss) var dismiss
	
	@FocusState var isFocused: Bool
	
	let textLimit = 4
	let textBoxWidth = UIScreen.main.bounds.width / 5
	let textBoxHeight = (UIScreen.main.bounds.width / 5) + 20
	let spaceBetweenBoxes: CGFloat = 10
	let paddingOfBox: CGFloat = 1
	var textFieldOriginalWidth: CGFloat {
		(textBoxWidth*4)+(spaceBetweenBoxes*3)+((paddingOfBox*2)*3)
	}
	
	var body: some View {
		NavigationView {
			GeometryReader { geometry in
				ZStack {
					ScrollView(.vertical) {
						VStack {
							ZStack {
								Image("mountain")
									.resizable()
									.scaledToFill()
									.frame(width: geometry.size.width, height: 100)
									.clipped()
								
								VStack(alignment: .leading) {
									HStack {
										Image("caret-left")
											.renderingMode(.template)
											.resizable()
											.foregroundStyle(Color.grayMain2c500)
											.frame(width: 25, height: 25, alignment: .leading)
											.padding(.all, 10)
											.padding(.top, -75)
											.padding(.leading, -10)
											.onTapGesture {
												withAnimation {
													dismiss()
												}
											}
										
										Spacer()
									}
									.padding(.leading)
								}
								.frame(width: geometry.size.width)
								
								Text("assistant_account_register")
									.default_text_style_white_800(styleSize: 20)
									.padding(.top, 20)
							}
							.padding(.top, 35)
							.padding(.bottom, 10)
							
							ZStack {
								VStack {
									Spacer()
									HStack {
										Spacer()
										Image("confirm_sms_code_illu")
											.padding(.bottom, -geometry.safeAreaInsets.bottom)
									}
								}
								VStack(alignment: .center) {
									Spacer()
									
									Text(String(format: NSLocalizedString("assistant_account_creation_sms_confirmation_explanation", comment: ""), registerViewModel.phoneNumber))
										.default_text_style(styleSize: 15)
										.foregroundStyle(Color.grayMain2c700)
										.padding(.horizontal, 10)
										.frame(maxWidth: .infinity, alignment: .center)
										.multilineTextAlignment(.center)
									
									VStack {
										ZStack {
											
											HStack(spacing: spaceBetweenBoxes) {
												otpText(text: registerViewModel.otp1, focused: registerViewModel.otpField.isEmpty)
												otpText(text: registerViewModel.otp2, focused: registerViewModel.otpField.count == 1)
												otpText(text: registerViewModel.otp3, focused: registerViewModel.otpField.count == 2)
												otpText(text: registerViewModel.otp4, focused: registerViewModel.otpField.count == 3)
											}
											
											TextField("", text: $registerViewModel.otpField)
												.default_text_style_600(styleSize: 80)
												.frame(width: isFocused ? 0 : textFieldOriginalWidth, height: textBoxHeight)
												.textContentType(.oneTimeCode)
												.foregroundColor(.clear)
												.accentColor(.clear)
												.background(.clear)
												.keyboardType(.numberPad)
												.focused($isFocused)
												.onChange(of: registerViewModel.otpField) { _ in
													limitText(textLimit)
													if registerViewModel.otpField.count > 3 {
														registerViewModel.validateCode()
													}
												}
										}
									}
									.frame(maxWidth: .infinity, alignment: .center)
									.padding(.vertical, 20)
									
									Button(action: {
										dismiss()
									}, label: {
										Text("assistant_account_creation_wrong_phone_number")
											.default_text_style_orange_600(styleSize: 15)
											.frame(height: 35)
									})
									.padding(.horizontal, 15)
									.padding(.vertical, 5)
									.cornerRadius(60)
									.overlay(
										RoundedRectangle(cornerRadius: 60)
											.inset(by: 0.5)
											.stroke(Color.orangeMain500, lineWidth: 1)
									)
									.padding(.bottom)
									.frame(maxWidth: .infinity)
									
									Spacer()
									Spacer()
								}
								.frame(maxWidth: sharedMainViewModel.maxWidth)
								.padding(.horizontal, 20)
							}
						}
						.frame(minHeight: geometry.size.height)
						.onAppear {
							registerViewModel.otpField = ""
						}
					}
					
					if registerViewModel.createInProgress {
						PopupLoadingView()
							.background(.black.opacity(0.65))
					}
				}
			}
			.navigationTitle("")
			.navigationBarHidden(true)
		}
		.navigationViewStyle(StackNavigationViewStyle())
		.navigationTitle("")
		.navigationBarHidden(true)
	}
	
	private func otpText(text: String, focused: Bool) -> some View {
		
		return Text(text)
			.foregroundStyle(isFocused && focused ? Color.orangeMain500 : Color.grayMain2c600)
			.default_text_style_600(styleSize: 40)
			.frame(width: textBoxWidth, height: textBoxHeight)
			.overlay(
				RoundedRectangle(cornerRadius: 20)
					.inset(by: 0.5)
					.stroke(isFocused && focused ? Color.orangeMain500 : Color.grayMain2c600, lineWidth: 1)
			)
			.padding(paddingOfBox)
	}
	
	func limitText(_ upper: Int) {
		if registerViewModel.otpField.count > upper {
			registerViewModel.otpField = String(registerViewModel.otpField.prefix(upper))
		}
	}
}

#Preview {
	RegisterCodeConfirmationFragment(registerViewModel: RegisterViewModel())
}
// swiftlint:enable line_length