module Contacts
  class SubmitInquiry
    TOPICS = %w[commercial support privacy].freeze
    LIMIT = 5
    WINDOW = 1.hour
    NAME_MAX = 120
    CLUB_MAX = 160
    MESSAGE_MIN = 10
    MESSAGE_MAX = 4_000

    Result = Struct.new(:ok, :error, keyword_init: true)

    def self.call(params:, ip:)
      new(params: params, ip: ip).call
    end

    def initialize(params:, ip:)
      @params = params
      @ip = ip.to_s.presence || "unknown"
    end

    def call
      if honeypot_filled?
        record_attempt
        return Result.new(ok: true, error: nil)
      end

      return Result.new(ok: false, error: :throttled) if throttled?

      error = validate
      return Result.new(ok: false, error: error) if error

      record_attempt
      deliver
      Result.new(ok: true, error: nil)
    end

    private

    def honeypot_filled?
      @params[:website].to_s.strip.present?
    end

    def throttled?
      current_count >= LIMIT
    end

    def validate
      return :privacy_required unless @params[:accept_privacy].to_s == "1"
      return :invalid if name.blank? || name.length > NAME_MAX
      return :invalid_email if email.blank? || email !~ URI::MailTo::EMAIL_REGEXP
      return :invalid if club_name.length > CLUB_MAX
      return :invalid unless TOPICS.include?(topic)
      return :invalid_message if message.length < MESSAGE_MIN || message.length > MESSAGE_MAX

      nil
    end

    def deliver
      mail = ContactMailer.inquiry(
        name: name,
        email: email,
        club_name: club_name,
        topic: topic,
        message: message
      )
      MatchLiveTv.deliver_mail(mail)
    end

    def record_attempt
      Rails.cache.write(cache_key, current_count + 1, expires_in: WINDOW, raw: true)
    end

    def current_count
      Rails.cache.read(cache_key, raw: true).to_i
    end

    def cache_key
      "contacts:inquiry:#{@ip}"
    end

    def name
      @params[:name].to_s.strip
    end

    def email
      @params[:email].to_s.strip.downcase
    end

    def club_name
      @params[:club_name].to_s.strip
    end

    def topic
      @params[:topic].to_s.strip
    end

    def message
      @params[:message].to_s.strip
    end
  end
end