module TimeZoneConverter

# File lib/time_zone_converter.rb, line 15
def self.call(args, time, method = :utc)
  arr = Array.new

  if method == :utc
    time = string_to_time(time, "UTC")
    arr = args.map { |city| [city, get_time(city, time)] }
  else # :local
    # Get time with zone for the first city
    time_zone = get_nearest_time_zone(args.first)

    if time.nil?
      time = Time.current.in_time_zone(time_zone)
    else
      time = string_to_time(time, time_zone)
    end

    # Add first item
    arr << [args.first, time]

    # Convert time for the rest of the cities in the args
    args[1..-1].each { |city| arr << [city, get_time(city, time)] }
    arr
  end
end

# File lib/time_zone_converter.rb, line 44
def self.get_nearest_time_zone(city)
  json = Oj.load(File.read(File.join(File.dirname(__FILE__), "../#{JSON_FILE}")))
  item = json.select! { |k, _| k == city }
  raise "Not found #{city}" unless item

  lat, lng = item[city][0], item[city][1]
  time_zone = NearestTimeZone.to(lat.to_f, lng.to_f)
end

# File lib/time_zone_converter.rb, line 54
def self.get_time(city, time)
  time_zone = get_nearest_time_zone(city)
  if time.is_a? Array
    time.map { |t| t.in_time_zone(time_zone) }
  else
    time.in_time_zone(time_zone)
  end
end

# File lib/time_zone_converter.rb, line 83
def self.new_time(year, mon, mday, hour, min, sec, microsec, zone)
  Time.new(
    year,
    mon,
    mday,
    hour,
    min,
    sec,
    zone
  )
end

# File lib/time_zone_converter.rb, line 68
def self.string_to_time(time, time_zone)
  return time unless time.is_a? String
  current_time = Time.new.utc
  zone = ActiveSupport::TimeZone[time_zone]

  if time =~ ISO_TIME
    new_time(current_time.year, current_time.month, current_time.day, $1.to_i, $2.to_i, 0, 0, zone)
  elsif time =~ ISO_TIME_RANGE
    [
      new_time(current_time.year, current_time.month, current_time.day, $1.to_i, $2.to_i, 0, 0, zone),
      new_time(current_time.year, current_time.month, current_time.day, $3.to_i, $4.to_i, 0, 0, zone)
    ]
  end
end