import Exception from './exception'

// fetch - обертка над window.fetch (параметры смотреть в Fetch API).
// Возвращает распарсенный обьект данных с сервера, либо Exception
// https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch

export default async function (url, query) {
  try {
    let response
    try {
      response = await window.fetch(url, query)
      switch (response.status) {
        case 200:
          try {
            let contentType = response.headers.get('content-type')
            if (contentType) {
              if (contentType.includes('application/json')) {
                try {
                  return await response.json()
                } catch (JSONError) { throw new Exception('software', 'JSON parse error') }
                // Other content-types
              } else { throw new Exception('software', 'Server response content-type error') }
            } else { throw new Exception('software', 'Response from server without content-type') }
          } catch (softwareException) { throw softwareException }
        case 500:
          throw new Exception('software', 'Internal server error.')
        case 400:
          throw new Exception('valid', 'Invalid fetching data. Please check your username and password.')
        case 401:
          throw new Exception('login', 'Bad login data. Please check your username and password.')
        case 403:
          throw new Exception('software', 'This errors must not exist')
        case 404:
          throw new Exception('software', 'Invalid exemplar of data model')
        default:
          throw new Exception('software', 'Unknown error with transfering data from server.')
      }
    } catch (error) { throw error }
  } catch (fetchError) {
    throw fetchError
  }
}