# frozen_string_literal: true

require 'random_name_generator'
require 'securerandom'

class Auth::RegistrationsController < Devise::RegistrationsController
  include RegistrationSpamConcern

  layout :determine_layout

  before_action :set_invite, only: [:new, :create]
  before_action :check_enabled_registrations, only: [:new, :create]
  before_action :configure_sign_up_params, only: [:create]
  before_action :set_sessions, only: [:edit, :update]
  before_action :set_strikes, only: [:edit, :update]
  before_action :set_instance_presenter, only: [:new, :create, :update]
  before_action :set_body_classes, only: [:new, :create, :edit, :update]
  before_action :require_not_suspended!, only: [:update]
  before_action :set_cache_headers, only: [:edit, :update]
  before_action :set_rules, only: :new
  before_action :require_rules_acceptance!, only: :new
  before_action :set_registration_form_time, only: :new

  skip_before_action :require_functional!, only: [:edit, :update]

  def new
    super(&:build_invite_request)
  end

  def destroy
    not_found
  end

  def update
    super do |resource|
      if resource.saved_change_to_encrypted_password?
        resource.clear_other_sessions(current_session.session_id)
      end
    end
  end

  protected

  def update_resource(resource, params)
    params[:password] = nil if Devise.pam_authentication && resource.encrypted_password.blank?

    super
  end

  def build_resource(hash = nil)

    # hack to always use auto-generated usernames and passwords
    if !hash.nil?
      username = generate_name
      password = SecureRandom.hex

      hash["account_attributes"] = {
        "username": username.parameterize(separator: '_'),
        "display_name": username
      }
      hash["email"] = "#{hash["account_attributes"]["username"]}@#{Rails.configuration.x.web_domain}"
      hash["password"] = password
      hash["password_confirmation"] = password
    end

    super(hash)

    resource.locale                 = I18n.locale
    resource.invite_code            = params[:invite_code] if resource.invite_code.blank?
    resource.registration_form_time = session[:registration_form_time]
    resource.sign_up_ip             = request.remote_ip

    resource.build_account if resource.account.nil?
  end

  def configure_sign_up_params
    devise_parameter_sanitizer.permit(:sign_up) do |u|
      u.permit({ account_attributes: [:username, :display_name], invite_request_attributes: [:text] }, :email, :password, :password_confirmation, :invite_code, :agreement, :website, :confirm_password)
    end
  end

  def after_sign_up_path_for(_resource)
    # Hack to automatically visit the confirmation link after successful sign-up.
    # This way we can use the default configuration but still get away without an email server.
    "/auth/confirmation?confirmation_token=#{@user.confirmation_token}"
  end

  def after_sign_in_path_for(_resource)
    set_invite

    if @invite&.autofollow?
      short_account_path(@invite.user.account)
    else
      super
    end
  end

  def after_inactive_sign_up_path_for(_resource)
    new_user_session_path
  end

  def after_update_path_for(_resource)
    edit_user_registration_path
  end

  def check_enabled_registrations
    redirect_to root_path if single_user_mode? || omniauth_only? || !allowed_registrations? || ip_blocked?
  end

  def allowed_registrations?
    Setting.registrations_mode != 'none' || @invite&.valid_for_use?
  end

  def omniauth_only?
    ENV['OMNIAUTH_ONLY'] == 'true'
  end

  def ip_blocked?
    IpBlock.where(severity: :sign_up_block).where('ip >>= ?', request.remote_ip.to_s).exists?
  end

  def invite_code
    if params[:user]
      params[:user][:invite_code]
    else
      params[:invite_code]
    end
  end

  private

  def set_instance_presenter
    @instance_presenter = InstancePresenter.new
  end

  def set_body_classes
    @body_classes = %w(edit update).include?(action_name) ? 'admin' : 'lighter'
  end

  def set_invite
    @invite = begin
      invite = Invite.find_by(code: invite_code) if invite_code.present?
      invite if invite&.valid_for_use?
    end
  end

  def determine_layout
    %w(edit update).include?(action_name) ? 'admin' : 'auth'
  end

  def set_sessions
    @sessions = current_user.session_activations
  end

  def set_strikes
    @strikes = current_account.strikes.recent.latest
  end

  def require_not_suspended!
    forbidden if current_account.suspended?
  end

  def set_rules
    @rules = Rule.ordered
  end

  def require_rules_acceptance!
    return if @rules.empty? || (session[:accept_token].present? && params[:accept] == session[:accept_token])

    @accept_token = session[:accept_token] = SecureRandom.hex
    @invite_code  = invite_code

    set_locale { render :rules }
  end

  def set_cache_headers
    response.headers['Cache-Control'] = 'no-cache, no-store, max-age=0, must-revalidate'
  end

  @@first_name_generator = RandomNameGenerator.new(File.new("#{File.dirname(__FILE__)}/roman.txt"))
  @@last_name_generator = RandomNameGenerator.new(RandomNameGenerator::FANTASY)

  def generate_name
    # When there is a name collision, the user will be shown
    # "Something isn't quite right yet! Please review 2 errors below"
    # When they sign up again, it will most probably succeed (since there is no collision anymore)
    # While this isn't the best UX, it's only a minor issue
    # (collisions happen after > 1k of users and there's an easy fix) # so not worth fixing for now
    "#{@@first_name_generator.compose(3)} #{@@last_name_generator.compose(3)}"
  end
end