#!/usr/bin/env python

import logging
import datetime
import subprocess
import xml.etree.ElementTree


# config
repo = 'https://xp-dev.com/svn/ns-stats'
component_dir = '/website'
export_dir = '/home/slooman/public_html'
tag_id_file = '/home/slooman/public_html/.tag'
deploy_string = '~~DEPLOY~~'


# logging
logging.basicConfig(filename='website_deployer.log', format='%(asctime)s %(name)s %(levelname)s %(message)s', level=logging.DEBUG)




def get_last_deployment_tag(repo_path):
    # execute svn log repo/trunk
    tags_url = repo_path + '/tags'
    out = subprocess.Popen(['svn', 'log', '-v', '--xml', tags_url], stdout=subprocess.PIPE).communicate()[0]


    # parse output
    tree = xml.etree.ElementTree.fromstring(out)

    for log_entry in tree.findall('logentry'):
        if deploy_string in log_entry.find('msg').text:
            for paths in log_entry.findall('paths'):
                for path in paths.findall('path'):
                    return path.text

    return (None, None)

def export(tag_path, target_dir):
    subprocess.call(['svn', 'export', '--force', tag_path, target_dir])

def current_tag_name(tag_file):
    f = open(tag_file, 'r')
    tag_name = f.read()
    f.close()
    return tag_name

def write_tag_name(tag_file, tag_name):
    f = open(tag_file, 'w')
    f.write(tag_name)
    f.close()

def main():
    logging.debug('starting deployer at {0}'.format(datetime.datetime.now()))
    logging.debug('fetching svn tags')
    tag_name = get_last_deployment_tag(repo)
    logging.debug('got tag: {0}'.format(tag_name))

    if tag_name and tag_name != current_tag_name(tag_id_file):
        logging.info('deploying new version, path: {0}'.format(tag_name))
        tag_path = repo + tag_name
        export(tag_path + component_dir, export_dir)
        write_tag_name(tag_id_file, tag_name)

    logging.debug('ending fetcher at {0}'.format(datetime.datetime.now()))


if __name__ == '__main__':
    main()