import ConfigParser
import os, inspect
import re
import smtplib
from email.mime.text import MIMEText
import subprocess
from subprocess import Popen, PIPE

dir_name = os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe())))

config_file = dir_name + '/config.cfg'

# Parse the config file
config = ConfigParser.RawConfigParser()
print 'Reading from config file', config_file
config.read(config_file)

fromaddr = config.get('Gmail', 'fromaddr')
smtp = config.get('Gmail', 'smtp')
username = config.get('Gmail', 'user')
password = config.get('Gmail', 'pass')

svn_path = config.get('Repository', 'path')
BASE = config.get('Repository', 'base').strip()

recipients = []
for item in config.items('Members'):
    if item[1] == 'true':
        recipients.append(item[0])

#print fromaddr
#print smtp
#print user
#print password
#print recipients

def getRevisionNum(revision):
    print 'Getting revision number at', svn_path
    revision_pattern = re.compile('^r[0-9]+ ', re.MULTILINE)
    p = subprocess.Popen(['svn', 'log', '-r'+revision, svn_path],
            stdout=PIPE, stderr=PIPE)
    stdout, stderr = p.communicate()
    p.wait()
    if p.returncode == 1:
        print stderr
        print stdout
        print "Something wrong, exit"
        os._exit(os.EX_DATAERR)
    res = revision_pattern.search(stdout)
    if res == None:
        print stdout
        print stderr
        print "Something wrong, exit"
        os._exit(os.EX_DATAERR)
    return res.group(0)[1:].strip()

# Get the HEAD
HEAD = getRevisionNum('HEAD')

print 'BASE Revision: ', BASE
print 'HEAD Revision: ', HEAD

if BASE == HEAD:
    print 'No changes'
    os._exit(os.EX_OK)

num_of_change = int(HEAD) - int(BASE)

BASE = str(int(BASE) + 1)

# Get the log between BASE and HEAD
p = subprocess.Popen(['svn', 'log', '-v', '-r'+HEAD+':'+BASE, svn_path],
        stdout=PIPE, stderr=PIPE)
stdout, stderr = p.communicate()
p.wait()
if p.returncode == 1:
    print "Something wrong, exit"
    print stdout
    print stderr
    os._exit(os.EX_DATAERR)

log_summary = stdout + '\n' + 'Please update your local repository before committing anything.\n\nIf you don\'t want to receive this notification, contact Wei (huangw5@cs.rpi.edu) \nto remove your email address.'

# Send email

toaddr = ','.join(recipients)

msg = MIMEText(log_summary)
if num_of_change > 1:
    msg['Subject'] = 'proganalysis: ' + str(num_of_change) + ' changes'
else:
    msg['Subject'] = 'proganalysis: ' + str(num_of_change) + ' change'
msg['From'] = fromaddr
msg['To'] = toaddr

print "Sending message...", msg

server = smtplib.SMTP(smtp)
server.starttls()
server.login(username,password)
server.sendmail(fromaddr, recipients, msg.as_string())
server.quit()

# Update the BASE in config file
config.set('Repository', 'base', HEAD)
configfile = open(config_file, 'wb')
config.write(configfile)
configfile.close()