# vi: ts=4 expandtab
#
#    Author: Avishai Ish-Shalom <avishai@fewbytes.com>
#    Author: Mike Moulton <mike@meltmedia.com>
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License version 3, as
#    published by the Free Software Foundation.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.

import os
import subprocess
import json
import cloudinit.CloudConfig as cc
import cloudinit.util as util

ruby_version_default = "1.8"


def handle(_name, cfg, cloud, log, _args):
    # If there isn't a chef key in the configuration don't do anything
    if 'chef' not in cfg:
        return
    chef_cfg = cfg['chef']

    # ensure the chef directories we use exist
    mkdirs(['/etc/chef', '/var/log/chef', '/var/lib/chef',
            '/var/cache/chef', '/var/backups/chef', '/var/run/chef'])

    # set the validation key based on the presence of either 'validation_key'
    # or 'validation_cert'. In the case where both exist, 'validation_key'
    # takes precedence
    if ('validation_key' in chef_cfg or 'validation_cert' in chef_cfg):
        validation_key = util.get_cfg_option_str(chef_cfg, 'validation_key',
                                                 chef_cfg['validation_cert'])
        with open('/etc/chef/validation.pem', 'w') as validation_key_fh:
            validation_key_fh.write(validation_key)

    # create the chef config from template
    util.render_to_file('chef_client.rb', '/etc/chef/client.rb',
        {'server_url': chef_cfg['server_url'],
         'node_name': util.get_cfg_option_str(chef_cfg, 'node_name',
                                          cloud.datasource.get_instance_id()),
         'environment': util.get_cfg_option_str(chef_cfg, 'environment',
                                                '_default'),
         'validation_name': chef_cfg['validation_name']})

    # set the firstboot json
    with open('/etc/chef/firstboot.json', 'w') as firstboot_json_fh:
        initial_json = {}
        if 'run_list' in chef_cfg:
            initial_json['run_list'] = chef_cfg['run_list']
        if 'initial_attributes' in chef_cfg:
            initial_attributes = chef_cfg['initial_attributes']
            for k in initial_attributes.keys():
                initial_json[k] = initial_attributes[k]
        firstboot_json_fh.write(json.dumps(initial_json))

    # If chef is not installed, we install chef based on 'install_type'
    if not os.path.isfile('/usr/bin/chef-client'):
        install_type = util.get_cfg_option_str(chef_cfg, 'install_type',
                                               'packages')
        if install_type == "gems":
            # this will install and run the chef-client from gems
            chef_version = util.get_cfg_option_str(chef_cfg, 'version', None)
            ruby_version = util.get_cfg_option_str(chef_cfg, 'ruby_version',
                                                   ruby_version_default)
            install_chef_from_gems(ruby_version, chef_version)
            # and finally, run chef-client
            log.debug('running chef-client')
            subprocess.check_call(['/usr/bin/chef-client', '-d', '-i', '1800',
                                   '-s', '20'])
        else:
            # this will install and run the chef-client from packages
            cc.install_packages(('chef',))


def get_ruby_packages(version):
    # return a list of packages needed to install ruby at version
    pkgs = ['ruby%s' % version, 'ruby%s-dev' % version]
    if version == "1.8":
        pkgs.extend(('libopenssl-ruby1.8', 'rubygems1.8'))
    return(pkgs)


def install_chef_from_gems(ruby_version, chef_version=None):
    cc.install_packages(get_ruby_packages(ruby_version))
    if not os.path.exists('/usr/bin/gem'):
        os.symlink('/usr/bin/gem%s' % ruby_version, '/usr/bin/gem')
    if not os.path.exists('/usr/bin/ruby'):
        os.symlink('/usr/bin/ruby%s' % ruby_version, '/usr/bin/ruby')
    if chef_version:
        subprocess.check_call(['/usr/bin/gem', 'install', 'chef',
                               '-v %s' % chef_version, '--no-ri',
                               '--no-rdoc', '--bindir', '/usr/bin', '-q'])
    else:
        subprocess.check_call(['/usr/bin/gem', 'install', 'chef',
                               '--no-ri', '--no-rdoc', '--bindir',
                               '/usr/bin', '-q'])


def ensure_dir(d):
    if not os.path.exists(d):
        os.makedirs(d)


def mkdirs(dirs):
    for d in dirs:
        ensure_dir(d)