const Authentication = require('./authentication')

const api = {
  loading: false,
  sendRequest: function(options, isPagination) {
    api.loading = true
    let token = Authentication.getToken()
    let pagination = isPagination
  
    if (token) {
      options.headers = options.headers || {}
      options.headers['Authorization'] = 'Bearer ' + token
    }
  
    options.extract = function(xhr) {
      if (xhr.responseText && xhr.responseText.slice(0, 9) === '<!doctype') {
        if (xhr.status === 500) {
          throw new Error('Server is temporarily down, try again later.')
        }
        throw new Error('Expected JSON but got HTML (' + xhr.status + ': ' + this.url.split('?')[0] + ')')
      }
      let out = null
      if (pagination && xhr.status < 300) {
        let headers = {}
  
        xhr.getAllResponseHeaders().split('\r\n').forEach(function(item) {
          var splitted = item.split(': ')
          headers[splitted[0]] = splitted[1]
        })
  
        out = {
          headers: headers || {},
          data: JSON.parse(xhr.responseText),
        }
      } else {
        if (xhr.responseText) {
          out = JSON.parse(xhr.responseText)
        } else {
          out = {}
        }
      }
      if (xhr.status >= 300) {
        if (out.message) {
          throw out
        }
        console.error('Got error ' + xhr.status + ' but no error message:', out)
        throw new Error('Unknown or empty response from server.')
      }
      return out
    }
  
    return m.request(options)
      .then(function(res) {
        api.loading = false
        window.requestAnimationFrame(m.redraw.bind(m))
        return res
      })
      .catch(function (error) {
        api.loading = false
        window.requestAnimationFrame(m.redraw.bind(m))
        if (error.status === 403) {
          Authentication.clearToken()
          m.route.set('/', { redirect: m.route.get() })
        }
        if (error.response && error.response.status) {
          return Promise.reject(error.response)
        }
        return Promise.reject(error)
      })
  }
}

module.exports = api