# frozen_string_literal: true

require 'spec_helper'

RSpec.describe Gitlab::Metrics::Subscribers::ActiveRecord do
  using RSpec::Parameterized::TableSyntax

  let(:env) { {} }
  let(:subscriber) { described_class.new }
  let(:connection) { double(:connection) }
  let(:payload) { { sql: 'SELECT * FROM users WHERE id = 10', connection: connection } }

  let(:event) do
    double(
      :event,
      name: 'sql.active_record',
      duration: 2,
      payload:  payload
    )
  end

  # Emulate Marginalia pre-pending comments
  def sql(query, comments: true)
    if comments && !%w[BEGIN COMMIT].include?(query)
      "/*application:web,controller:badges,action:pipeline,correlation_id:01EYN39K9VMJC56Z7808N7RSRH*/ #{query}"
    else
      query
    end
  end

  shared_examples 'track generic sql events' do
    where(:name, :sql_query, :record_query, :record_write_query, :record_cached_query) do
      'SQL' | 'SELECT * FROM users WHERE id = 10' | true | false | false
      'SQL' | 'WITH active_milestones AS (SELECT COUNT(*), state FROM milestones GROUP BY state) SELECT * FROM active_milestones' | true | false | false
      'SQL' | 'SELECT * FROM users WHERE id = 10 FOR UPDATE' | true | true | false
      'SQL' | 'WITH archived_rows AS (SELECT * FROM users WHERE archived = true) INSERT INTO products_log SELECT * FROM archived_rows' | true | true | false
      'SQL' | 'DELETE FROM users where id = 10' | true | true | false
      'SQL' | 'INSERT INTO project_ci_cd_settings (project_id) SELECT id FROM projects' | true | true | false
      'SQL' | 'UPDATE users SET admin = true WHERE id = 10' | true | true | false
      'CACHE' | 'SELECT * FROM users WHERE id = 10' | true | false | true
      'SCHEMA' | "SELECT attr.attname FROM pg_attribute attr INNER JOIN pg_constraint cons ON attr.attrelid = cons.conrelid AND attr.attnum = any(cons.conkey) WHERE cons.contype = 'p' AND cons.conrelid = '\"projects\"'::regclass" | false | false | false
      nil | 'BEGIN' | false | false | false
      nil | 'COMMIT' | false | false | false
    end

    with_them do
      let(:payload) { { name: name, sql: sql(sql_query, comments: comments), connection: connection } }

      it 'marks the current thread as using the database' do
        # since it would already have been toggled by other specs
        Thread.current[:uses_db_connection] = nil

        expect { subscriber.sql(event) }.to change { Thread.current[:uses_db_connection] }.from(nil).to(true)
      end

      it_behaves_like 'record ActiveRecord metrics'
      it_behaves_like 'store ActiveRecord info in RequestStore'
    end
  end

  context 'without Marginalia comments' do
    let(:comments) { false }

    it_behaves_like 'track generic sql events'
  end

  context 'with Marginalia comments' do
    let(:comments) { true }

    it_behaves_like 'track generic sql events'
  end
end