require 'httparty'

class MicrosoftGraph
  BASE_URL = 'https://graph.microsoft.com/v1.0'.freeze
  BETA_BASE_URL = 'https://graph.microsoft.com/beta'.freeze
  # Documentation says that "common" can be used (instead of tenantID) to refresh access token
  REFRESH_TOKEN_URL = 'https://login.microsoftonline.com/common/oauth2/v2.0/token'.freeze

  def initialize(current_user, client_id, client_secret, scopes)
    @current_user = current_user
    @uid = current_user.microsoft_user_id
    @token = current_user.microsoft_access_token
    @refresh_token = current_user.microsoft_refresh_token
    @expires_at = current_user.microsoft_token_expires_at

    @client_id = client_id
    @client_secret = client_secret
    @scopes = scopes
  end

  def request(resource)
    return false unless @token

    response = HTTParty.get(
      "#{BASE_URL}/#{resource}",
      headers: {
        Authorization: "Bearer #{@token}"
      }
    )

    if response.code != 200
      p '[Microsoft Graph API Error]'
      p response.inspect
      false
    else
      JSON.parse(response.body)
    end
  end

  def create_teams_meeting(start_date_time, end_date_time, subject)
    # check if token expired and obtain new access_token using refresh token

    response = HTTParty.post(
      "#{BETA_BASE_URL}/me/onlineMeetings",
      body: {
        startDateTime: start_date_time,
        endDateTime: end_date_time,
        subject: subject,
        participants: {
          organizer: {
            identity: {
              user: {
                id: @uid
              }
            }
          }
        }
      },
      headers: {
        Authorization: "Bearer #{@token}"
      }
    )

    if response.code != 201
      p '[Microsoft Graph API Error] Failed to create online meeting'
      p response.inspect
    else
      JSON.parse(response.body)
    end
  end

  def refresh_token
    response = HTTParty.post(REFRESH_TOKEN_URL,
                             body: {
                               client_id: @client_id,
                               client_secret: @client_secret,
                               refresh_token: @refresh_token,
                               grant_type: 'refresh_token',
                               scope: @scopes
                             })

  end
end