class ScrapeCalendarJob < ApplicationJob
  queue_as :default

  def clean_up_lecture_title(unit_code, short_lecture_title) end

  def perform(*args)
    ics_file = HTTParty.get("https://mytimetable.bath.ac.uk/ical?6519757b&group=false&timetable=!MjAyMyFzdHVkZW50c2V0ITRDRjQ5MjlGRTg1M0Q4N0MyMDZENTVDNUQ3QTJFNzk0&eu=amMzMDkxQGJhdGguYWMudWs=&h=MiuDbRiudE_Yf7B25v2SfEuFCtmYGkFb5sAUI3yGmtY=")
    calendars = Icalendar::Calendar.parse(ics_file)
    calendar = calendars.first

    unit_codes = Course.all.map(&:unit_code)

    events = calendar.events.map do |event|
      summary = event.summary
      match = summary.split('-')

      # Handle odd events we don't care about
      next if match.length != 2

      unit_code = match[0]
      short_lecture_title = match[1]
      start_time = event.dtstart.to_time
      event_uuid = event.uid.to_s

      next if unit_code.nil? ||
        short_lecture_title.nil? ||
        event_uuid.nil? ||
        start_time.nil? ||
        !unit_code.in?(unit_codes)

      {
        unit_code:,
        short_lecture_title:,
        start_time:,
        event_uuid:,
      }
    end

    events
      .compact
      .filter { |attrs| attrs[:unit_code].in? unit_codes }
      .group_by { |attrs| attrs[:unit_code] }
      .map do |unit_code, course_events|
      course = Course.find_by(unit_code: unit_code)

      lecture_counter = 0

      course_events.each do |event|
        # Naive check to see if we've already created this lecture
        if course.lectures.find_by(event_uuid: event[:event_uuid]).present? || course.lectures.find_by(
          start_time: (event[:start_time].beginning_of_hour + 5.minutes)..(event[:start_time].beginning_of_hour + 1.hour + 5.minutes)
        ).present?
          next
        end

        if event[:short_lecture_title].starts_with? "Lec"
          lecture_counter += 1
          title = "Lecture #{lecture_counter}"
        else
          title = event[:short_lecture_title]
        end

        course.lectures.create!(
          title: title,
          start_time: event[:start_time],
          event_uuid: event[:event_uuid],
        )
      end
    end
  end
end