require 'uri'

module Outreach
  class Authorization
    API_URL = 'https://api.outreach.io/oauth/token'.freeze

    attr_reader :token, :refresh_token, :expires_in

    def initialize(attrs)
      @token = attrs['access_token']
      @refresh_token = attrs['refresh_token']
      @expires_in = attrs['expires_in']
    end

    def self.authorization_url
      url = 'https://api.outreach.io/oauth/authorize'
      params = {
        client_id: Outreach.application_identifier,
        redirect_uri: Outreach.redirect_uri,
        response_type: 'code',
        scope: Outreach.scopes
      }
      url + '?' + URI.encode_www_form(params)
    end

    def self.create(authorization_code)
      params = {
        client_id: Outreach.application_identifier,
        client_secret: Outreach.application_secret,
        redirect_uri: Outreach.redirect_uri,
        grant_type: 'authorization_code',
        code: authorization_code
      }
      response = Outreach::Request.new.post(API_URL, params)
      new(response)
    end

    def self.refresh(refresh_token)
      params = {
        client_id: Outreach.application_identifier,
        client_secret: Outreach.application_secret,
        redirect_uri: Outreach.redirect_uri,
        grant_type: 'refresh_token',
        refresh_token: refresh_token
      }
      response = Request.new.post(API_URL, params)
      new(response)
    end
  end
end