# frozen_string_literal: true

require 'securerandom'

module RudderAnalyticsSync
  module Utils
    def self.included(klass)
      klass.extend(self)
    end

    def symbolize_keys(hash)
      hash.transform_keys(&:to_sym)
    end

    # public: Converts all the date values in the into iso8601 strings in place
    #
    def isoify_dates!(hash)
      hash.replace isoify_dates hash
    end

    # public: Returns a new hash with all the date values in the into iso8601
    #         strings
    #
    def isoify_dates(hash)
      hash.transform_values do |v|
        maybe_datetime_in_iso8601(v)
      end
    end

    # public: Returns a uid string
    #
    def uid
      arr = SecureRandom.random_bytes(16).unpack('NnnnnN')
      arr[2] = (arr[2] & 0x0fff) | 0x4000
      arr[3] = (arr[3] & 0x3fff) | 0x8000
      '%08x-%04x-%04x-%04x-%04x%08x' % arr # rubocop:disable Style/FormatString
    end

    def maybe_datetime_in_iso8601(datetime)
      case datetime
      when Time
        time_in_iso8601 datetime
      when DateTime
        time_in_iso8601 datetime.to_time
      when Date
        date_in_iso8601 datetime
      else
        datetime
      end
    end

    def time_in_iso8601(time, fraction_digits = 3)
      fraction = (format('.%06i', time.usec)[0, fraction_digits + 1] if fraction_digits.positive?)

      "#{time.strftime('%Y-%m-%dT%H:%M:%S')}#{fraction}#{formatted_offset(time, true, 'Z')}"
    end

    def date_in_iso8601(date)
      date.strftime('%F')
    end

    def formatted_offset(time, colon = true, alternate_utc_string = nil) # rubocop:disable Style/OptionalBooleanParameter
      (time.utc? && alternate_utc_string) || seconds_to_utc_offset(time.utc_offset, colon)
    end

    def seconds_to_utc_offset(seconds, colon = true) # rubocop:disable Style/OptionalBooleanParameter
      format((colon ? UTC_OFFSET_WITH_COLON : UTC_OFFSET_WITHOUT_COLON), (seconds.negative? ? '-' : '+'), (seconds.abs / 3600), ((seconds.abs % 3600) / 60))
    end

    def valid_date?(string)
      !!(string.match(/\d{4}-\d{2}-\d{2}/) && Date.strptime(string, '%Y-%m-%d'))
    rescue ArgumentError
      false
    end

    UTC_OFFSET_WITH_COLON = '%s%02d:%02d'
    UTC_OFFSET_WITHOUT_COLON = UTC_OFFSET_WITH_COLON.sub(':', '')
  end
end