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require 'exifr/jpeg'

# Add to your Gemfile: gem 'exifr', '~> 1.3', '>= 1.3.6'
# I created the file in /lib/active_storage/sasa_analyzer.rb
# You will also need to update your application.rb: config.autoload_paths << "#{Rails.root}/lib/active_storage"

# Draws on https://ledermann.dev/blog/2018/05/15/exif-analyzer-for-active-storage/

class SasaAnalyzer < ActiveStorage::Analyzer

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  def self.liquid_voltage_lookup(beer_voltage, battery_voltage)

    # solve for rt in kilos: vo = vbat * (Rt/(Rt+R1))
    # vbat = battery_voltage
    # vo = beer_voltage
    # r1 = 100

    temperature = nil
    rt          = BigDecimal(beer_voltage,6) * BigDecimal(100,6) / ( BigDecimal(battery_voltage,6) - BigDecimal(beer_voltage,6) )  if battery_voltage!=beer_voltage
    if rt

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