class SwishQr

# File lib/swish_qr.rb, line 18
def initialize(args)
  check_args(args)
  @result = HTTParty.post(SWISH_QR_API_ENDPOINT,
    :body => build_data_hash(args),
    :headers => { 'Content-Type' => 'application/json' } )
end

# File lib/swish_qr.rb, line 37
def error
  @result.parsed_response['error']
end

# File lib/swish_qr.rb, line 33
def http_response_code
  @result.code
end

# File lib/swish_qr.rb, line 25
def image
  @result.body
end

# File lib/swish_qr.rb, line 29
def success?
  @result.code == 200
end

# File lib/swish_qr.rb, line 66
def build_data_hash(args)
  @image_format = args[:format]
  @data_hash = get_simple_values_from_args(args)
  @data_hash.merge!(get_complex_values_from_args(args))
  sanitise_amount
  @data_hash.to_json
end

# File lib/swish_qr.rb, line 43
def check_args(args)
  check_format(args)
  check_jpeg_transparency(args)
  check_border(args)
  check_size(args)
end

# File lib/swish_qr.rb, line 54
def check_border(args)
  raise ArgumentError, "Max border is 4" if (args[:border].to_i > 4)
end

# File lib/swish_qr.rb, line 62
def check_format(args)
  raise ArgumentError, "Invalid format: '#{args[:format]}', must specify one of: #{VALID_FORMATS}" unless VALID_FORMATS.include?(args[:format])
end

# File lib/swish_qr.rb, line 50
def check_jpeg_transparency(args)
  raise ArgumentError, "JPEG can't be transparent" if (args[:format] == 'jpg' && args[:transparent])
end

# File lib/swish_qr.rb, line 58
def check_size(args)
  raise ArgumentError, "Size (minimum 300) must be specified for #{args[:format]}" unless (args[:format] == 'svg' || args[:size].to_i >= 300)
end

# File lib/swish_qr.rb, line 89
def get_complex_values_from_args(args)
  ret = {}
  COMPLEX_VALUES.each do |k|
    ret[k] = { value: args[k], editable: ((args[:editable]||[]).include?(k)) } if args[k]
  end
  ret
end

# File lib/swish_qr.rb, line 85
def get_simple_values_from_args(args)
  args.select{|k,v| SIMPLE_VALUES.include?(k)}
end

# File lib/swish_qr.rb, line 74
def sanitise_amount
  return unless @data_hash[:amount]
  # Delete amount if it's blank / 0, to ensure that the request is valid
  if @data_hash[:amount][:value].to_i == 0
    @data_hash.delete(:amount)
    return
  end
  # This is to support BigDecimal, which would otherwise get misrepresented as a string in the JSON
  @data_hash[:amount][:value] = @data_hash[:amount][:value].to_f unless @data_hash[:amount][:value].is_a?(Integer)
end