//
//  RegistrationView.swift
//  VolnahubApp
//
//  Created by cheykrym on 09/06/2025.
//

import SwiftUI

struct RegistrationView: View {
    @Environment(\.presentationMode) private var presentationMode
    
    @State private var fullName: String = ""
    @State private var username: String = ""
    @State private var password: String = ""
    @State private var confirmPassword: String = ""
    @State private var inviteCode: String = ""
    @AppStorage("isDarkMode") private var isDarkMode: Bool = true

    private var isUsernameValid: Bool {
        let pattern = "^[A-Za-z0-9_]{3,32}$"
        return username.range(of: pattern, options: .regularExpression) != nil
    }

    private var isPasswordValid: Bool {
        password.count >= 6 && password.count <= 32
    }

    private var isConfirmPasswordValid: Bool {
        confirmPassword == password && !confirmPassword.isEmpty
    }

    private var isFormValid: Bool {
        !fullName.isEmpty && isUsernameValid && isPasswordValid && isConfirmPasswordValid
    }

    var body: some View {
        NavigationView {
            VStack {

                Text(NSLocalizedString("RegistrationView_title", comment: "Регистрация"))
                    .font(.largeTitle)
                    .bold()

//                Spacer()

                // Полное имя
                TextField(NSLocalizedString("RegistrationView_fullname", comment: "Полное имя"), text: $fullName)
                    .padding()
                    .background(Color(.secondarySystemBackground))
                    .cornerRadius(8)
                    .autocapitalization(.words)
                    .disableAutocorrection(true)

                // Логин
                TextField(NSLocalizedString("RegistrationView_login", comment: "Логин"), text: $username)
                    .padding()
                    .background(Color(.secondarySystemBackground))
                    .cornerRadius(8)
                    .autocapitalization(.none)
                    .disableAutocorrection(true)

                if !isUsernameValid && !username.isEmpty {
                    Text(NSLocalizedString("RegistrationView_error_username_invalid", comment: "Неверный логин"))
                        .foregroundColor(.red)
                        .font(.caption)
                }

                // Пароль
                SecureField(NSLocalizedString("RegistrationView_password", comment: "Пароль"), text: $password)
                    .padding()
                    .background(Color(.secondarySystemBackground))
                    .cornerRadius(8)
                    .autocapitalization(.none)

                if !isPasswordValid && !password.isEmpty {
                    Text(NSLocalizedString("RegistrationView_error_password_invalid", comment: "Пароль должен быть от 6 до 32 символов"))
                        .foregroundColor(.red)
                        .font(.caption)
                }

                // Подтверждение пароля
                SecureField(NSLocalizedString("RegistrationView_confirm_password", comment: "Подтверждение пароля"), text: $confirmPassword)
                    .padding()
                    .background(Color(.secondarySystemBackground))
                    .cornerRadius(8)
                    .autocapitalization(.none)

                if !isConfirmPasswordValid && !confirmPassword.isEmpty {
                    Text(NSLocalizedString("RegistrationView_error_confirm_password_invalid", comment: "Пароли не совпадают"))
                        .foregroundColor(.red)
                        .font(.caption)
                }

                // Инвайт-код
                TextField(NSLocalizedString("RegistrationView_invite", comment: "Инвайт-код"), text: $inviteCode)
                    .padding()
                    .background(Color(.secondarySystemBackground))
                    .cornerRadius(8)
                    .autocapitalization(.none)
                    .disableAutocorrection(true)

                // Кнопка регистрации
                Button(action: {
                    print("Регистрация отправлена")
                }) {
                    Text(NSLocalizedString("RegistrationView_button_register", comment: "Зарегистрироваться"))
                        .foregroundColor(.white)
                        .padding()
                        .frame(maxWidth: .infinity)
                        .background(isFormValid ? Color.blue : Color.gray.opacity(0.6))
                        .cornerRadius(8)
                }
                .disabled(!isFormValid)

            }
            .padding()
            .navigationBarItems(trailing:
                Button(action: {
                    presentationMode.wrappedValue.dismiss()
                }) {
                    Text(NSLocalizedString("RegistrationView_close", comment: "Закрыть"))
                }
            )
        }
    }

}

struct RegistrationView_Previews: PreviewProvider {
    static var previews: some View {
        RegistrationView()
    }
}