import students

app/services/student_loader.rb

@@ -0,0 +1,74 @@
+# frozen_string_literal: true
+
+# SurveyItemResponse.where(student: StudentRace.where(race: Race.find_by_qualtrics_code(8)).limit(10).map(&:student)).count
+require 'csv'
+
+class StudentLoader
+  def self.load_data(filepath:)
+    File.open(filepath) do |file|
+      headers = file.first
+
+      students = []
+      file.lazy.each_slice(1000) do |lines|
+        CSV.parse(lines.join, headers:).map do |row|
+          # students << process_row(row:)
+          process_row(row:)
+        end
+      end
+      # Student.import students.compact.flatten.to_set.to_a, batch_size: 1000,
+      #                                                      on_duplicate_key_update: { conflict_target: [:id] }
+    end
+  end
+
+  def self.process_row(row:)
+    race_codes = row['RACE'] || row['What is your race/ethnicity?(Please select all that apply) - Selected Choice'] || '99'
+    race_codes = race_codes.split(',').map(&:to_i) || []
+    races = process_races(codes: race_codes)
+    response_id = row['ResponseId'] || row['Responseid'] || row['ResponseID'] ||
+                  row['Response ID'] || row['Response id'] || row['Response Id']
+    lasid = row['LASID'] || row['lasid']
+    return nil if student_exists?(response_id:)
+
+    student = create_student(response_id:, lasid:, races:)
+
+    assign_student_to_responses(response_id:, student:)
+    student
+  end
+
+  def self.student_exists?(response_id:)
+    Student.find_by_response_id(response_id).present?
+  end
+
+  def self.assign_student_to_responses(response_id:, student:)
+    survey_responses = SurveyItemResponse.where(response_id:)
+    survey_responses.each do |response|
+      response.student = student
+      response.save
+    end
+
+    # SurveyItemResponse.import survey_responses, on_duplicate_key_update: { conflict_target: [:id], columns: [:student] }
+  end
+
+  def self.create_student(response_id:, lasid:, races:)
+    student = Student.new(response_id:)
+    races.each do |race|
+      student.races << race
+    end
+    student.lasid = lasid
+    student.save
+    student
+  end
+
+  def self.process_races(codes:)
+    codes = codes.map do |code|
+      code = 99 if [6, 7].include?(code)
+      Race.find_by_qualtrics_code(code)
+    end
+    remove_unknown_race_if_other_races_present(races: codes.to_set)
+  end
+
+  def self.remove_unknown_race_if_other_races_present(races:)
+    races.delete(Race.find_by_qualtrics_code(99)) if races.length > 1
+    races
+  end
+end