import time

from fabric.api import *

env.git_remote = 'git@example.com:myapp.git'

def production():
    """Production server settings"""
    env.settings = 'production'
    env.hosts = ['example.com']
    env.user = 'user'

def deploy():
    """Deploy the latest version of the site to the server and restart"""
    clone_repo()
    checkout_latest()
    install_requirements()
    symlink_current_release()
    migrate()
    reload()

def clone_repo():
    """Do initial clone of the git repo"""
    run('if [ ! -d ~/shared/cached-copy ]; then git clone %(git_remote)s ~/shared/cached-copy; fi' % env)

def checkout_latest():
    """Pull the latest code into the git repo and copy to a timestamped release directory"""
    env.release = time.strftime('%Y%m%d%H%M%S')
    run("cd ~/shared/cached-copy; git pull origin master")
    run('cp -R ~/shared/cached-copy ~/releases/%(release)s; rm -rf ~/releases/%(release)s/.git*' % env)

def install_requirements():
    """Install the required packages using pip"""
    run('pip install -E ~/ -r ~/releases/%(release)s/requirements.txt' % env)

def symlink_current_release():
    """Symlink our current release, uploads and settings file"""
    run('cd ~/; ln -nfs ~/releases/%(release)s current' % env)
    run('cd ~/current/usability_manager; ln -nfs ~/shared/db db')

def migrate():
    """Run our migrations"""
    run('cd ~/current; ~/bin/python manage.py syncdb --noinput')

def reload():
    """Reload uWSGI"""
    run('kill -HUP $(< ~/shared/pids/uwsgi.pid)')