from __future__ import print_function
import httplib2
import os

from apiclient import discovery
import oauth2client
from oauth2client import client
from oauth2client import tools
from gmail_msg import *
from event import *

try:
    import argparse
    flags = argparse.ArgumentParser(parents=[tools.argparser]).parse_args()
except ImportError:
    flags = None

# If modifying these scopes, delete your previously saved credentials
# at ~/.credentials/gmail-python-quickstart.json
SCOPES = 'https://www.googleapis.com/auth/gmail.readonly'
CLIENT_SECRET_FILE = 'client_secret.json'
APPLICATION_NAME = 'Gmail API Python'


def get_credentials():
    """Gets valid user credentials from storage.

    If nothing has been stored, or if the stored credentials are invalid,
    the OAuth2 flow is completed to obtain the new credentials.

    Returns:
        Credentials, the obtained credential.
    """
    home_dir = os.path.expanduser('~')
    credential_dir = os.path.join(home_dir, '.credentials')
    if not os.path.exists(credential_dir):
        os.makedirs(credential_dir)
    credential_path = os.path.join(credential_dir,
                                   'gmail-python-quickstart.json')

    store = oauth2client.file.Storage(credential_path)
    credentials = store.get()
    if not credentials or credentials.invalid:
        flow = client.flow_from_clientsecrets(CLIENT_SECRET_FILE, SCOPES)
        flow.user_agent = APPLICATION_NAME
        if flags:
            credentials = tools.run_flow(flow, store, flags)
        else: # Needed only for compatibility with Python 2.6
            credentials = tools.run(flow, store)
        print('Storing credentials to ' + credential_path)
    return credentials

def get_list_event_gmail():
    
    """
    Creates a Gmail API service object and outputs a list of messages which contain the keyword in the user's Gmail account.
   
    """
    
    credentials = get_credentials()
    http = credentials.authorize(httplib2.Http())
    service = discovery.build('gmail', 'v1', http=http)
    results = service.users().labels().list(userId='me').execute()
    labels = results.get('labels', [])


    list_event = []
    if not labels:
        print('No labels found.')
        return list_event



    keyword = input('Please enter a keyword to start searching the related messages in the mailbox(ctrl+c for quit) : ').lower()

    for i in range(3):
        print()
        
    #print('Labels:')
    for label in labels:
        if (label['name']=='INBOX'):
            print(label['name'])        
            list_msg = ListMessagesMatchingQuery(service,"me", query=keyword)
            #list_msg = ListMessagesWithLabels(service, "me", label['id'])
            #print(list_msg)
            i = 0
            for msg in list_msg:
                i = i + 1
                #print()
                #print('Message #%d:'% i)
                #print('----')
                msg = GetMessage(service,"me",msg['id'])
                headers = get_message_header(msg)
                
                withwho = withwhomail = subject = date = location = body = status = ""
                for e in headers:
                    if (e['name']=='From'):
                        #print 'Receive from: %s' % e['value']
                        withwhomail = e['value']
                        
                    if (e['name']=='Subject'):
                        #print 'Subject: %s' % e['value']
                        subject = e['value']


                    if (e['name']=='Date'):
                        #print 'Date: %s' % e['value']
                        date = e['value']
                                  
                mime_msg = GetMimeMessage(service,"me",msg['id'])
                body = get_message_body(mime_msg).decode()
                list_event.append(Event(date,location,body))
    return list_event
                #print('Body:')
                #print('%s' % msg_body)
                  
                #print(GetMessage(service, "me", msg['id']))
                #GetMimeMessage(service,"me",msg['id'])
    #print()