class MonitorInbox
  include Interactor

  VALID_ACTIONS = [
    "encender",
  ]

  def call
    build_authorized_senders
    context.actions_executed_count=0
    email = context.email || ENV["EMAIL"]
    password = context.password || ENV["PASSWORD"]

    fetch_emails_res = FetchEmails.call!(
      email: email,
      password: password,
      query_from: calculate_from_time
    )

    emails_arr = fetch_emails_res.messages
    analyze_emails(emails_arr)
    context.analyzed_emails_count = emails_arr.count
  end

  # Construye un array de direcciones de email a partir del contenido de la variable 
  # de entorno AUTHORIZED_SENDERS que contendra una lista de emails separados por coma
  def build_authorized_senders
    context.authorized_senders = ENV["AUTHORIZED_SENDERS"].split(",")
  end

  # Si existe un registro de ActionLog entonces usar el created_at time
  # sino utilizar ahora
  def calculate_from_time
    latest_action_log = ActionLog.last
    time = if latest_action_log
             latest_action_log.created_at
           else
             Time.now - 5.minutes
           end
    time
  end

  # Analiza uno a uno los elmentos del array de emails
  def analyze_emails(emails_arr)
    emails_arr.each do |email|
      Rails.logger.info "Analyzing email with subject: #{email.subject} From: #{email.from} On #{email.date}"
      if is_action_email?(email)
        execute_action(email)
      end
    end
  end

  # Verifica si un email es considerado basado en su subject y quien lo envio
  def is_action_email?(email)
    VALID_ACTIONS.include?(email.subject.downcase) && context.authorized_senders.include?(email.from.downcase)
  end

  # Ejecuta la accion indicada en el email
  def execute_action(email)
    al=ActionLog.new(
      from: email.from,
      subject: email.subject,
      created_at: email.date,
      action: "encender"
    )

    if al.valid?
      Rails.logger.info "Executing action..."
      command = ENV["COMMAND"]
      system(command)
      context.actions_executed_count+=1
      al.save!
    else
      # We're using the validate uniqueness of ActionLog to detect duplicate actions
      # we have already processed if we get this exception we should not execute it
      Rails.logger.info "We have already executed this action"
    end
  end
end