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

# (c) 2013, Andrew Dunham <andrew@du.nham.ca>
# Based on macports (Jimmy Tang <jcftang@gmail.com>)
#
# This module 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.
#
# This software 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 software.  If not, see <http://www.gnu.org/licenses/>.

DOCUMENTATION = '''
---
module: homebrew
author: Andrew Dunham
short_description: Package manager for Homebrew
description:
    - Manages Homebrew packages
version_added: "1.4"
options:
    name:
        description:
            - name of package to install/remove
        required: true
    state:
        description:
            - state of the package
        choices: [ 'present', 'absent' ]
        required: false
        default: present
    update_homebrew:
        description:
            - update homebrew itself first
        required: false
        default: "no"
        choices: [ "yes", "no" ]
    install_options:
        description:
            - options flags to install a package
        required: false
        default: null
notes:  []
'''
EXAMPLES = '''
- homebrew: name=foo state=present
- homebrew: name=foo state=present update_homebrew=yes
- homebrew: name=foo state=absent
- homebrew: name=foo,bar state=absent
- homebrew: name=foo state=present install_options=with-baz,enable-debug
'''


def update_homebrew(module, brew_path):
    """ Updates packages list. """

    rc, out, err = module.run_command("%s update" % brew_path)

    if rc != 0:
        module.fail_json(msg="could not update homebrew")


def query_package(module, brew_path, name, state="present"):
    """ Returns whether a package is installed or not. """

    if state == "present":
        rc, out, err = module.run_command("%s list -m1 | grep -q '^%s$'" % (brew_path, name))
        if rc == 0:
            return True

        return False


def remove_packages(module, brew_path, packages):
    """ Uninstalls one or more packages if installed. """

    removed_count = 0

    # Using a for loop incase of error, we can report the package that failed
    for package in packages:
        # Query the package first, to see if we even need to remove.
        if not query_package(module, brew_path, package):
            continue

        if module.check_mode:
            module.exit_json(changed=True)
        rc, out, err = module.run_command([brew_path, 'remove', package])

        if query_package(module, brew_path, package):
            module.fail_json(msg="failed to remove %s: %s" % (package, out.strip()))

        removed_count += 1

    if removed_count > 0:
        module.exit_json(changed=True, msg="removed %d package(s)" % removed_count)

    module.exit_json(changed=False, msg="package(s) already absent")


def install_packages(module, brew_path, packages, options):
    """ Installs one or more packages if not already installed. """

    installed_count = 0

    for package in packages:
        if query_package(module, brew_path, package):
            continue

        if module.check_mode:
            module.exit_json(changed=True)

        cmd = [brew_path, 'install', package]
        if options:
            cmd.extend(options)
        rc, out, err = module.run_command(cmd)

        if not query_package(module, brew_path, package):
            module.fail_json(msg="failed to install %s: '%s' %s" % (package, cmd, out.strip()))

        installed_count += 1

    if installed_count > 0:
        module.exit_json(changed=True, msg="installed %d package(s)" % (installed_count,))

    module.exit_json(changed=False, msg="package(s) already present")

def generate_options_string(install_options):
    if install_options is None:
        return None

    options = []

    for option in install_options:
        options.append('--%s' % option)

    return options


def main():
    module = AnsibleModule(
        argument_spec = dict(
            name = dict(aliases=["pkg"], required=True),
            state = dict(default="present", choices=["present", "installed", "absent", "removed"]),
            update_homebrew = dict(default="no", aliases=["update-brew"], type='bool'),
            install_options = dict(default=None, aliases=["options"], type='list')
        ),
        supports_check_mode=True
    )

    brew_path = module.get_bin_path('brew', True, ['/usr/local/bin'])

    p = module.params

    if p["update_homebrew"]:
        update_homebrew(module, brew_path)

    pkgs = p["name"].split(",")

    if p["state"] in ["present", "installed"]:
        opt = generate_options_string(p["install_options"])
        install_packages(module, brew_path, pkgs, opt)

    elif p["state"] in ["absent", "removed"]:
        remove_packages(module, brew_path, pkgs)

# this is magic, see lib/ansible/module_common.py
from ansible.module_utils.basic import *

main()