require 'rubygems'
require 'google/api_client'
require 'launchy'

CLIENT_ID = 'my_app_Id_on_gmail_developers_console'
CLIENT_SECRET = 'the_secret_key'
OAUTH_SCOPE = 'https://mail.google.com/'
REDIRECT_URI = 'urn:ietf:wg:oauth:2.0:oob'

# Create a new API client & load the Google Drive API
client = Google::APIClient.new(:application_name => 'Ruby Gmail sample',
                               :application_version => '1.0.0')
gmail = client.discovered_api('gmail', "v1")

# Request authorization
client.authorization.client_id = CLIENT_ID
client.authorization.client_secret = CLIENT_SECRET
client.authorization.scope = OAUTH_SCOPE
client.authorization.redirect_uri = REDIRECT_URI

uri = client.authorization.authorization_uri
Launchy.open(uri)

# Exchange authorization code for access token
$stdout.write  "Enter authorization code: "
client.authorization.code = gets.chomp
client.authorization.fetch_access_token!

#testing if it is working well by counting the emails.
@emails = client.execute(
    api_method: gmail.users.messages.list,
    parameters: {
        userId: "me"},
    headers: {'Content-Type' => 'application/json'}
)

count = @emails.data.messages.count
puts "you have #{count} emails "
# Pretty print the API result
jj @emails.data.messages