class ApplicationController < ActionController::Base
  include Pundit::Authorization

  # Prevent CSRF attacks by raising an exception. Note that this is different from the default of :null_session.
  # Rails 5 introduced a boolean option called prepend for maintaining the order of execution
  protect_from_forgery with: :exception, prepend: true

  before_action :sign_out_if_required
  before_action :store_user_location, if: :storable_location?
  before_action :redirect_to_primary_domain, if: :domain_redirection_required?

  around_action :set_time_zone, if: :current_user
  around_action :switch_locale, if: :current_user

  helper_method :avatar
  helper_method :current_host
  helper_method :current_school
  helper_method :current_coach
  helper_method :current_school_admin

  # When in production, respond to requests that ask for unhandled formats with 406.
  rescue_from ActionView::MissingTemplate do |exception|
    raise exception unless Rails.env.production?

    # Force format to HTML, because we don't have error pages for other format requests.
    request.format = "html"

    raise ActionController::UnknownFormat, "Not Acceptable"
  end

  # Pundit authorization error should cause a 404.
  rescue_from Pundit::NotAuthorizedError do |exception|
    if Rails.env.development?
      logger.error "Pundit::NotAuthorizedError: #{exception.message}"
      logger.error exception.backtrace.join("\n")
    end

    raise_not_found
  end

  rescue_from ActionController::InvalidAuthenticityToken do
    flash.now[:error] = I18n.t("shared.invalid_authenticity_token_error")
  end

  # Redirect all requests from unknown domains to service homepage.
  rescue_from RequestFromUnknownDomain do
    redirect_to(
      "https://lms.pupilfirst.org?redirect_from=#{current_host}",
      allow_other_host: true
    )
  end

  def raise_not_found
    raise ActionController::RoutingError, "Not Found"
  end

  def after_sign_in_path_for(resource_or_scope)
    stored_location_for(resource_or_scope) || dashboard_path
  end

  def current_host
    return "test.host" if Rails.env.test?

    # If there is a port in the request URL, then keep it in the string returned here.
    if request.original_url.match?(/^https?:\/\/.*:\d{1,5}/)
      "#{request.host}:#{request.port}"
    else
      request.host
    end
  end

  def current_domain
    @current_domain ||= Domain.find_by(fqdn: current_host)
  end

  # Returns the "resolved" school for a request.
  def current_school
    @current_school ||=
      if Settings.multitenancy
        resolved_school = current_domain&.school

        raise RequestFromUnknownDomain if resolved_school.blank?

        resolved_school
      else
        School.first
      end
  end

  def current_coach
    @current_coach ||= current_user&.faculty
  end

  def current_school_admin
    @current_school_admin ||=
      begin
        if current_user.present? && current_school.present?
          current_user.school_admin
        end
      end
  end

  # sets a permanent signed cookie. Additional options such as :tld_length can be passed via the options_hash
  # eg: set_cookie(:token, 'abcd', { 'tld_length' => 1 })
  def set_cookie(key, value, options_hash = {})
    cookies.permanent.signed[key] = { value: value }.merge(options_hash)
  end

  # read a signed cookie
  def read_cookie(key)
    cookies.signed[key]
  end

  def feature_active?(feature)
    Feature.active?(feature, current_user)
  end

  helper_method :feature_active?

  def feature_enabled?(feature_name)
    feature = Flipper[feature_name]
    feature.enabled?(current_user)
  end

  helper_method :feature_enabled?

  # Makes redirects observable from integration tests.
  def observable_redirect_to(url)
    if Rails.env.test?
      render plain:
               "If this wasn't an integration test, you'd be redirected to: #{url}"
    else
      redirect_to(url, allow_other_host: true)
    end
  end

  def pundit_user
    OpenStruct.new(
      current_user: current_user,
      current_school: current_school,
      current_coach: current_coach,
      current_school_admin: current_school_admin
    )
  end

  helper_method :pundit_user

  def api_token
    @api_token ||=
      begin
        header = request.headers["Authorization"]&.strip

        # Authorization headers are of format "Authorization: <type> <credentials>".
        # We only care about the supplied credentials.
        if header&.starts_with?("HMAC")
          # skip: do nothing this is a webhook request
        elsif header.present?
          header.split(" ")[-1]
        end
      end
  end

  def current_user
    if api_token.present?
      @current_user ||=
        Users::FindByApiTokenService.new(api_token, current_school).find
    else
      super
    end
  end

  private

  def set_time_zone(&)
    Time.use_zone(current_user.time_zone, &)
  end

  def switch_locale(&)
    I18n.with_locale(current_user.locale, &)
  end

  def sign_out_if_required
    service = ::Users::ManualSignOutService.new(self, current_user)
    service.sign_out_if_required
    redirect_to root_url if service.signed_out?
  end

  def storable_location?
    non_html_response =
      destroy_user_session_path ||
        (is_a?(::TargetsController) && params[:action] == "details_v2")

    public_page =
      _process_action_callbacks.none? { |p| p.filter == :authenticate_user! }

    request.get? && is_navigational_format? && !request.xhr? && !public_page &&
      !non_html_response
  end

  def store_user_location
    store_location_for(:user, request.fullpath)
  end

  def avatar(
    name,
    student: nil,
    faculty: nil,
    version: :mid,
    background_shape: :circle
  )
    if faculty.present? && faculty.image.attached?
      return helpers.image_tag(faculty.image).html_safe
    end

    if student.present? && student.avatar.attached?
      return helpers.image_tag(student.avatar_variant(version)).html_safe
    end

    Scarf::InitialAvatar
      .new(
        name,
        font_family: ["Source Sans Pro", "sans-serif"],
        background_shape: background_shape
      )
      .svg
      .html_safe
  end

  def domain_redirection_required?
    return false if current_domain.blank?

    return false if current_domain.primary? || current_school.domains.one?
    !Schools::Configuration.new(
      current_school
    ).disable_primary_domain_redirection?
  end

  def redirect_to_primary_domain
    observable_redirect_to "#{request.ssl? ? "https" : "http"}://#{current_school.domains.primary.fqdn}#{request.path}"
  end

  before_action :set_last_seen_at,
                if:
                  proc {
                    user_signed_in? &&
                      (
                        session[:last_seen_at] == nil ||
                          Time.zone.parse(session[:last_seen_at]) <
                            15.minutes.ago
                      )
                  }

  def set_last_seen_at
    current_user.update!(last_seen_at: Time.current)
    session[:last_seen_at] = Time.current.iso8601
  end
end