completed SMS gateway project

app/controllers/api/v1/admin/stats_controller.rb

@@ -0,0 +1,60 @@
+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