# frozen_string_literal: true

class Gpx::TrackParser
  attr_reader :import, :json, :user_id

  def initialize(import, user_id)
    @import = import
    @json = import.raw_data
    @user_id = user_id
  end

  def call
    tracks = json['gpx']['trk']
    tracks_arr = tracks.is_a?(Array) ? tracks : [tracks]

    tracks_arr
      .map { parse_track(_1) }
      .flatten
      .reduce { |result, points| result.merge(points) { _2 + _3 } }
  end

  private

  def parse_track(track)
    segments = track['trkseg']
    segments_arr = segments.is_a?(Array) ? segments : [segments]

    segments_arr.map do |segment|
      trackpoints = segment['trkpt']

      points = trackpoints.reduce(0) { _1 + create_point(_2) }
      doubles = trackpoints.size - points
      processed = points + doubles

      { raw_points: trackpoints.size, points:, doubles:, processed: }
    end
  end

  def create_point(point)
    return 0 if point['lat'].blank? || point['lon'].blank? || point['time'].blank?
    return 0 if point_exists?(point)

    Point.create(
      latitude:   point['lat'].to_d,
      longitude:  point['lon'].to_d,
      altitude:   point['ele'].to_i,
      timestamp:  Time.parse(point['time']).to_i,
      import_id:  import.id,
      raw_data: point,
      user_id:
    )

    1
  end

  def point_exists?(point)
    Point.exists?(
      latitude:   point['lat'].to_d,
      longitude:  point['lon'].to_d,
      timestamp:  Time.parse(point['time']).to_i,
      user_id:
    )
  end
end