import os
import re

from fabric.api import cd, hide, local, puts


CONTRIB_DIR = 'gallery-contrib'
GALLERY_REPO = 'git://github.com/gallery/gallery3.git'
GALLERY_CONTRIB_REPO = 'git://github.com/gallery/gallery3-contrib.git'
DATABASE_PREFIX = 'gallery_'


# PRIVATE UTILITY FUNCTIONS

def _get_tags():
	with hide('running'):
		output = local('git ls-remote --tags ' + GALLERY_REPO)
	it = re.finditer('/([^/]+)$', output, re.MULTILINE)
	return [m.group(1) for m in it]


def _get_last_version():
	return max(_get_tags())


def _get_gallery_dirs():
	current_dir = os.getcwd()
	entries = os.listdir(current_dir)
	dirs = filter(os.path.isdir, entries)
	if CONTRIB_DIR in dirs:
		dirs.remove(CONTRIB_DIR)
	return dirs


# TAGS TASKS

def list_tags():
	map(puts, _get_tags())


def last_version():
	puts(_get_last_version())


# INSTANCES TASKS

def deploy(name, database_password=None):
	create_instance(name)
	create_database(name, database_password)


def create_instance(name):
	local('git clone ' + GALLERY_REPO + ' ' + name)
	with cd(name):
		tag = _get_last_version()
		local('git checkout ' + tag)
		local('mkdir var')
		local('chown www-data:www-data var')
	path = os.path.abspath(name)
	puts('New gallery instance deployed in ' + path)


def create_database(site, password=None):
	if not password:
		password = local('pwgen -s 8 1')

	database_name = DATABASE_PREFIX + site
	database_user = database_name + '@localhost'

	local('mysqladmin -u root -p create ' + database_name)
	local('mysql -u root -p -e "CREATE USER ' + database_user + ' IDENTIFIED BY \'' + password + '\';"')
	local('mysql -u root -p -e "GRANT ALL ON ' + database_name + '.* TO ' + database_user + ';"')

	puts('Database ' + database_name + ' successfully created with password ' + password)


def upgrade_site(site, tag=None):
	if not tag:
		tag = _get_last_version()

	puts('Upgrade site ' + site + ' to version ' + tag)
	with cd(site):
		local('git fetch origin')
		local('git checkout ' + tag)


def upgrade(site=None, tag=None):
	if not tag:
		tag = _get_last_version()

	if site:
		upgrade_site(site, tag)
		return

	for site in _get_gallery_dirs():
		upgrade_site(site, tag)
		puts('')


# CONTRIB REPO TASKS

def setup_contrib():
	local('git clone ' + GALLERY_CONTRIB_REPO + ' ' + CONTRIB_DIR)
	path = os.path.abspath(CONTRIB_DIR)
	puts('Contrib repository fetched in ' + path)


def upgrade_contrib():
	with cd(CONTRIB_DIR):
		local('git pull origin master')