class WebMock::RequestBodyDiff

def body_diff
  return {} unless request_signature_diffable? && request_stub_diffable?
  Hashdiff.diff(request_signature_body_hash, request_stub_body_hash)
end

def initialize(request_signature, request_stub)
  @request_signature = request_signature
  @request_stub      = request_stub
end

def parseable_json?(body_pattern)
  return false unless body_pattern.is_a?(String)
  JSON.parse(body_pattern)
  true
rescue JSON::ParserError
  false
end

def request_signature_body_hash
  JSON.parse(request_signature.body)
end

def request_signature_diffable?
  request_signature.json_headers? && request_signature_parseable_json?
end

def request_signature_parseable_json?
  parseable_json?(request_signature.body)
end

def request_stub_body
  request_stub.request_pattern &&
    request_stub.request_pattern.body_pattern &&
    request_stub.request_pattern.body_pattern.pattern
end

def request_stub_body_hash
  return request_stub_body if request_stub_body.is_a?(Hash)
  JSON.parse(request_stub_body)
end

def request_stub_diffable?
  request_stub_body.is_a?(Hash) || request_stub_parseable_json?
end

def request_stub_parseable_json?
  parseable_json?(request_stub_body)
end