feat: label reports overview (#11194)

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/builders/v2/reports/label_summary_builder.rb

@@ -0,0 +1,101 @@
+class V2::Reports::LabelSummaryBuilder < V2::Reports::BaseSummaryBuilder
+  attr_reader :account, :params
+
+  # rubocop:disable Lint/MissingSuper
+  # the parent class has no initialize
+  def initialize(account:, params:)
+    @account = account
+    @params = params
+
+    timezone_offset = (params[:timezone_offset] || 0).to_f
+    @timezone = ActiveSupport::TimeZone[timezone_offset]&.name
+  end
+  # rubocop:enable Lint/MissingSuper
+
+  def build
+    labels = account.labels.to_a
+    return [] if labels.empty?
+
+    report_data = collect_report_data
+    labels.map { |label| build_label_report(label, report_data) }
+  end
+
+  private
+
+  def collect_report_data
+    conversation_filter = build_conversation_filter
+    use_business_hours = use_business_hours?
+
+    {
+      conversation_counts: fetch_conversation_counts(conversation_filter),
+      resolved_counts: fetch_resolved_counts(conversation_filter),
+      resolution_metrics: fetch_metrics(conversation_filter, 'conversation_resolved', use_business_hours),
+      first_response_metrics: fetch_metrics(conversation_filter, 'first_response', use_business_hours),
+      reply_metrics: fetch_metrics(conversation_filter, 'reply', use_business_hours)
+    }
+  end
+
+  def build_label_report(label, report_data)
+    {
+      id: label.id,
+      name: label.title,
+      conversations_count: report_data[:conversation_counts][label.title] || 0,
+      avg_resolution_time: report_data[:resolution_metrics][label.title] || 0,
+      avg_first_response_time: report_data[:first_response_metrics][label.title] || 0,
+      avg_reply_time: report_data[:reply_metrics][label.title] || 0,
+      resolved_conversations_count: report_data[:resolved_counts][label.title] || 0
+    }
+  end
+
+  def use_business_hours?
+    ActiveModel::Type::Boolean.new.cast(params[:business_hours])
+  end
+
+  def build_conversation_filter
+    conversation_filter = { account_id: account.id }
+    conversation_filter[:created_at] = range if range.present?
+
+    conversation_filter
+  end
+
+  def fetch_conversation_counts(conversation_filter)
+    fetch_counts(conversation_filter)
+  end
+
+  def fetch_resolved_counts(conversation_filter)
+    fetch_counts(conversation_filter.merge(status: :resolved))
+  end
+
+  def fetch_counts(conversation_filter)
+    ActsAsTaggableOn::Tagging
+      .joins('INNER JOIN conversations ON taggings.taggable_id = conversations.id')
+      .joins('INNER JOIN tags ON taggings.tag_id = tags.id')
+      .where(
+        taggable_type: 'Conversation',
+        context: 'labels',
+        conversations: conversation_filter
+      )
+      .select('tags.name, COUNT(taggings.*) AS count')
+      .group('tags.name')
+      .each_with_object({}) { |record, hash| hash[record.name] = record.count }
+  end
+
+  def fetch_metrics(conversation_filter, event_name, use_business_hours)
+    ReportingEvent
+      .joins('INNER JOIN conversations ON reporting_events.conversation_id = conversations.id')
+      .joins('INNER JOIN taggings ON taggings.taggable_id = conversations.id')
+      .joins('INNER JOIN tags ON taggings.tag_id = tags.id')
+      .where(
+        conversations: conversation_filter,
+        name: event_name,
+        taggings: { taggable_type: 'Conversation', context: 'labels' }
+      )
+      .group('tags.name')
+      .order('tags.name')
+      .select(
+        'tags.name',
+        use_business_hours ? 'AVG(reporting_events.value_in_business_hours) as avg_value' : 'AVG(reporting_events.value) as avg_value'
+      )
+      .each_with_object({}) { |record, hash| hash[record.name] = record.avg_value.to_f }
+  end
+end