#!/usr/bin/python
# -*- coding: utf-8 -*-

import os

from ansible.module_utils.basic import *

"""
Ansible module to manage elasticsearch plugins
(c) 2015, Mathew Davies <thepixeldeveloper@googlemail.com>

This file is part of Ansible

Ansible is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Ansible 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 Ansible.  If not, see <http://www.gnu.org/licenses/>.
"""

DOCUMENTATION = '''
---
module: elasticsearch_plugin
short_description: Manage Elasticsearch plugins
description:
    - Manages Elasticsearch plugins.
version_added: ""
author: Mathew Davies (@ThePixelDeveloper)
options:
    name:
        description:
            - Name of the plugin to install
        required: True
    state:
        description:
            - Desired state of a plugin.
        required: False
        choices: [present, absent]
        default: present
    url:
        description:
            - Set exact URL to download the plugin from
        required: False
        default: None
    timeout:
        description:
            - Timeout setting: 30s, 1m, 1h... (1m by default)
        required: False
    plugin_bin:
        description:
            - Location of the plugin binary
        required: False
        default: /usr/share/elasticsearch/bin/plugin
    plugin_dir:
        description:
            - Your configured plugin directory specified in Elasticsearch
        required: False
        default: /usr/share/elasticsearch/plugins/
    version:
        description: 
            - Version of the plugin to be installed.
        default: None
'''

EXAMPLES = '''
# Install Elasticsearch head plugin
- elasticsearch_plugin: state=present name="mobz/elasticsearch-head"
'''


def parse_plugin_repo(string):
    elements = string.split("/")

    # We first consider the simplest form: pluginname
    repo = elements[0]

    # We consider the form: username/pluginname
    if len(elements) > 1:
        repo = elements[1]

    # remove elasticsearch- prefix
    # remove es- prefix
    for string in ("elasticsearch-", "es-"):
        if repo.startswith(string):
            return repo[len(string):]

    return repo


def is_plugin_present(plugin_dir, working_dir):
    return os.path.isdir(os.path.join(working_dir, plugin_dir))


def parse_error(string):
    reason = "reason: "
    return string[string.index(reason) + len(reason):].strip()


def main():

    package_state_map = dict(
        present="--install",
        absent="--remove"
    )

    module = AnsibleModule(
        argument_spec=dict(
            name=dict(required=True),
            state=dict(default="present", choices=package_state_map.keys()),
            url=dict(default=None),
            timeout=dict(default="1m"),
            plugin_bin=dict(default="/usr/share/elasticsearch/bin/plugin"),
            plugin_dir=dict(default="/usr/share/elasticsearch/plugins/"),
            version=dict(default=None)
        )
    )

    plugin_bin = module.params["plugin_bin"]
    plugin_dir = module.params["plugin_dir"]
    name = module.params["name"]
    state = module.params["state"]
    url = module.params["url"]
    timeout = module.params["timeout"]
    version = module.params["version"]

    present = is_plugin_present(parse_plugin_repo(name), plugin_dir)

    # skip if the state is correct
    if (present and state == "present") or (state == "absent" and not present):
        module.exit_json(changed=False, name=name)
        
    if (version):
       name = name + '/' + version

    cmd_args = [plugin_bin, package_state_map[state], name]

    if url:
        cmd_args.append("--url %s" % url)

    if timeout:
        cmd_args.append("--timeout %s" % timeout)

    cmd = " ".join(cmd_args)

    rc, out, err = module.run_command(cmd)

    if rc != 0:
        reason = parse_error(out)
        module.fail_json(msg=reason)

    module.exit_json(changed=True, cmd=cmd, name=name, state=state, url=url, timeout=timeout, stdout=out, stderr=err)

if __name__ == "__main__":
    main()