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# Initialize the client & Google+ API
require 'google/api_client'
require 'google/api_client/client_secrets'
require 'google/api_client/auth/installed_app'
require 'json'
require "yaml"
require "time"

# Initialize OAuth 2.0 client
# authorization
# client = Google::APIClient.new(
#     :application_name => 'Rails Calendar',
#     :application_version => '1.0.0'
# )

# 認証部分(取得できていれば不要)
# plus = client.discovered_api('plus')
#
# Google Console でアプリを作る必要がある
# flow = Google::APIClient::InstalledAppFlow.new(
#     :client_id => 'ここにクライアントID',
#     :client_secret => 'ここにクライアントシークレットID',
#     :scope => ['https://www.googleapis.com/auth/calendar']
# )
#
# # 認証開始
# client.authorization = flow.authorize
#
# # 認証情報をファイルへ書き込む
# File.open("./.google-api.yaml", "w"){|f|
#   x = {
#       "mechanism" => "oauth_2",
#       "scope" => "https://www.googleapis.com/auth/calendar",
#       "client_id" => client.authorization.client_id,
#       "client_secret" => client.authorization.client_secret,
#       "access_token" => client.authorization.access_token,
#       "refresh_token" => client.authorization.refresh_token
#   }
#   f.puts(x.to_yaml)
# }

# ファイルを読み込む
oauth_yaml = YAML.load_file('./.google-api.yaml')

# 認証情報をセットする
client = Google::APIClient.new({:application_name => "gcalxx",:application_version => "1.0"})
client.authorization.client_id     = oauth_yaml["client_id"]
client.authorization.client_secret = oauth_yaml["client_secret"]
client.authorization.scope         = oauth_yaml["scope"]
client.authorization.refresh_token = oauth_yaml["refresh_token"]
client.authorization.access_token  = oauth_yaml["access_token"]
if client.authorization.refresh_token && client.authorization.expired?
  client.authorization.fetch_access_token!
end

# カレンダー API のインスタンス化
cal = client.discovered_api('calendar', 'v3')


# カレンダーリストの取得
page_token = nil
result = client.execute(:api_method => cal.calendar_list.list)
while true
  entries = result.data.items
  entries.each do |e|
    print e.summary + "\n"
  end
  if !(page_token = result.data.next_page_token)
    break
  end
  result = client.execute(:api_method => service.calendar_list.list,
                          :parameters => {'pageToken' => page_token})
end


p result.data.items


# # イベント取得月の確認
# printf("カレンダーを表示する年(20XX)：")
# year = gets.strip.to_i
# printf("カレンダーを表示する月(1-12)：")
# month = gets.strip.to_i

today   = Date.today
today31 = Date.today + 31

# 時間を格納
time_min = Time.utc(today.year, today.month, today.day, 0).iso8601
time_max = Time.utc(today31.year, today31.month, today31.day,0).iso8601

# イベントの取得
params = {'calendarId' => 'primary',
          'orderBy' => 'startTime',
          'timeMax' => time_max,
          'timeMin' => time_min,
          'singleEvents' => 'True'}

# データの取得(取得方法は Google のサイトを参考にする)
result = client.execute(:api_method => cal.events.list,
                        :parameters => params)

# イベントの格納
events = []
result.data.items.each do |item|
  events << item
end

# 出力
events.each do |event|
  printf("%s,%s\n",event.start.dateTime, event.summary)
end