module Api
  module V1
    module Admin
      class StatsController < ApplicationController
        include ApiAuthenticatable

        # GET /api/v1/admin/stats
        def index
          today = Time.current.beginning_of_day

          # Gateway stats
          total_gateways = ::Gateway.count
          active_gateways = ::Gateway.active.count
          online_gateways = ::Gateway.online.count

          # Message stats
          total_messages_sent = ::Gateway.sum(:total_messages_sent)
          total_messages_received = ::Gateway.sum(:total_messages_received)

          messages_sent_today = ::Gateway.sum(:messages_sent_today)
          messages_received_today = ::Gateway.sum(:messages_received_today)

          # Pending and failed messages
          pending_messages = SmsMessage.pending.count
          failed_messages_today = SmsMessage.failed
                                            .where("created_at >= ?", today)
                                            .count

          # OTP stats
          otps_sent_today = OtpCode.where("created_at >= ?", today).count
          otps_verified_today = OtpCode.where("verified_at >= ?", today).count

          render json: {
            gateways: {
              total: total_gateways,
              active: active_gateways,
              online: online_gateways,
              offline: total_gateways - online_gateways
            },
            messages: {
              total_sent: total_messages_sent,
              total_received: total_messages_received,
              sent_today: messages_sent_today,
              received_today: messages_received_today,
              total_today: messages_sent_today + messages_received_today,
              pending: pending_messages,
              failed_today: failed_messages_today
            },
            otp: {
              sent_today: otps_sent_today,
              verified_today: otps_verified_today,
              verification_rate: otps_sent_today > 0 ? (otps_verified_today.to_f / otps_sent_today * 100).round(2) : 0
            },
            timestamp: Time.current
          }
        end
      end
    end
  end
end