#!/usr/bin/env python
"""
RTM Task emailer

Emails all current incomplete RTM tasks.  It uses a gmail account to
send the email.

SETUP:
Edit RTM_USERNAME, USERNAME, PASSWORD below
The first time you run the script, run it with the "auth" argument

    $ ./rtm-emailer.py auth

The script will print a URL, which you must visit to authenticate this
script.  The RTM website will provide you with a frob value, which you
must paste here.

Subsequent executions of the script will no longer need the "auth"
argument and can run non-interactively.  Use cron to get daily emails.

Debug information is printed to stderr, when you are logging to a file,
redirect stderr to /dev/null.

    $ ./rtm-emailer.py 2>/dev/null
"""
import rtmapi
import smtplib
import sys
import time

#rtm api settings
API_KEY = '88cb5c01a7f2e7a5b6662101437f8d21'
SHARED_SECRET = '3727dc15923e7a5f'
RTM_USERNAME = 'rtmusername'

#gmail settings
USERNAME = 'name@gmail.com'
PASSWORD = 'password'
FROM_ADDR = USERNAME
TO_ADDR = USERNAME
HOSTNAME = 'smtp.gmail.com'

def get_tasks(rtm):
    response = rtm.tasks.getList(filter='status:incomplete')

    # multiple lists can be returned, iterate through each list
    # and then iterate through all the tasks in each list
    tasks = []
    for rtm_list in response.find('tasks').findall('list'):
        for task in rtm_list.findall('taskseries'):
            tasks.append(task.attrib['name'])
    return tasks

def send_rtm_tasks_email(body):
    server = smtplib.SMTP(HOSTNAME, 587)
    server.set_debuglevel(1)
    server.ehlo()
    server.starttls()
    try:
        server.login(USERNAME, PASSWORD)
    except smtplib.SMTPAuthenticationError:
        log('Gmail authentication problem.  Please check username/password.')

    headers = ['From: %s' % FROM_ADDR,
               'To: %s' % TO_ADDR,
               'MIME-Version: 1.0',
               'Content-type: text/plain',
               'Subject: RTM tasks']
    message = '\r\n'.join(headers).encode('utf-8') + '\r\n' + body
    server.sendmail(FROM_ADDR, TO_ADDR, message)
    server.quit()

def log(output):
    print time.strftime('[%H:%M] %m/%d/%y: ') + output


if __name__ == '__main__':
    rtm = rtmapi.RtmAPI(API_KEY, SHARED_SECRET, username=RTM_USERNAME)

    # If "auth" is passed as an argument, set up application access.
    if len(sys.argv) > 1 and sys.argv[1] == 'auth':
        print 'Visit this url and authenticate this script.  Then copy the frob token here.'
        print rtm.web_login_url('read')
        frob = raw_input('frob > ')
        #will cache the token on disk
        rtm.get_token(frob)

    try:
        tasks = get_tasks(rtm)
    except rtmapi.exceptions.RtmError:
        log('Authentication error.  Please run the script manually with "auth" as an argument.')
        sys.exit()

    send_rtm_tasks_email('\r\n'.join(tasks))
    log('Emailed %d tasks to %s.' % (len(tasks), TO_ADDR))