feat: Add backend APIs for the bot metrics (#9031)

Co-authored-by: Pranav <pranav@chatwoot.com>

app/builders/v2/reports/bot_metrics_builder.rb

@@ -0,0 +1,54 @@
+class V2::Reports::BotMetricsBuilder
+  include DateRangeHelper
+  attr_reader :account, :params
+
+  def initialize(account, params)
+    @account = account
+    @params = params
+  end
+
+  def metrics
+    {
+      conversation_count: bot_conversations.count,
+      message_count: bot_messages.count,
+      resolution_rate: bot_resolution_rate.to_i,
+      handoff_rate: bot_handoff_rate.to_i
+    }
+  end
+
+  private
+
+  def bot_activated_inbox_ids
+    @bot_activated_inbox_ids ||= account.inboxes.filter(&:active_bot?).map(&:id)
+  end
+
+  def bot_conversations
+    @bot_conversations ||= account.conversations.where(inbox_id: bot_activated_inbox_ids).where(created_at: range)
+  end
+
+  def bot_messages
+    @bot_messages ||= account.messages.outgoing.where(conversation_id: bot_conversations.ids).where(created_at: range)
+  end
+
+  def bot_resolutions_count
+    account.reporting_events.joins(:conversation).select(:conversation_id).where(account_id: account.id, name: :conversation_bot_resolved,
+                                                                                 created_at: range).distinct.count
+  end
+
+  def bot_handoffs_count
+    account.reporting_events.joins(:conversation).select(:conversation_id).where(account_id: account.id, name: :conversation_bot_handoff,
+                                                                                 created_at: range).distinct.count
+  end
+
+  def bot_resolution_rate
+    return 0 if bot_conversations.count.zero?
+
+    bot_resolutions_count.to_f / bot_conversations.count * 100
+  end
+
+  def bot_handoff_rate
+    return 0 if bot_conversations.count.zero?
+
+    bot_handoffs_count.to_f / bot_conversations.count * 100
+  end
+end