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

# Copyright (c) 2013 Shaun Zinck <shaun.zinck at gmail.com>
# Copyright (c) 2015 Lawrence Leonard Gilbert <larry@L2G.to>
#
# Written by Shaun Zinck
# Based on pacman module written by Afterburn <http://github.com/afterburn>
#  that was based on apt module written by Matthew Williams <matthew@flowroute.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: pkgin
short_description: Package manager for SmartOS, NetBSD, et al.
description:
    - "The standard package manager for SmartOS, but also usable on NetBSD
      or any OS that uses C(pkgsrc).  (Home: U(http://pkgin.net/))"
version_added: "1.0"
author:
    - "Larry Gilbert (L2G)"
    - "Shaun Zinck (@szinck)"
notes:
    - "Known bug with pkgin < 0.8.0: if a package is removed and another
      package depends on it, the other package will be silently removed as
      well.  New to Ansible 1.9: check-mode support."
options:
    name:
        description:
            - Name of package to install/remove;
            - multiple names may be given, separated by commas
        required: false
        default: null
    state:
        description:
            - Intended state of the package
        choices: [ 'present', 'absent' ]
        required: false
        default: present
    update_cache:
        description:
          - Update repository database. Can be run with other steps or on it's own.
        required: false
        default: no
        choices: [ "yes", "no" ]
        version_added: "2.1"
'''

EXAMPLES = '''
# install package foo
- pkgin: name=foo state=present

# Update database and install "foo" package
- pkgin: name=foo update_cache=yes

# remove package foo
- pkgin: name=foo state=absent

# remove packages foo and bar
- pkgin: name=foo,bar state=absent

# Update repositories as a separate step
- pkgin: update_cache=yes
'''


import re

def query_package(module, pkgin_path, name):
    """Search for the package by name.

    Possible return values:
    * "present"  - installed, no upgrade needed
    * "outdated" - installed, but can be upgraded
    * False      - not installed or not found
    """

    # test whether '-p' (parsable) flag is supported.
    rc, out, err = module.run_command("%s -p -v" % pkgin_path)

    if rc == 0:
        pflag = '-p'
        splitchar = ';'
    else:
        pflag = ''
        splitchar = ' '

    # Use "pkgin search" to find the package. The regular expression will
    # only match on the complete name.
    rc, out, err = module.run_command("%s %s search \"^%s$\"" % (pkgin_path, pflag, name))

    # rc will not be 0 unless the search was a success
    if rc == 0:

        # Search results may contain more than one line (e.g., 'emacs'), so iterate
        # through each line to see if we have a match.
        packages = out.split('\n')

        for package in packages:

            # Break up line at spaces.  The first part will be the package with its
            # version (e.g. 'gcc47-libs-4.7.2nb4'), and the second will be the state
            # of the package:
            #     ''  - not installed
            #     '<' - installed but out of date
            #     '=' - installed and up to date
            #     '>' - installed but newer than the repository version
            pkgname_with_version, raw_state = package.split(splitchar)[0:2]

            # Search for package, stripping version
            # (results in sth like 'gcc47-libs' or 'emacs24-nox11')
            pkg_search_obj = re.search(r'^([a-zA-Z]+[0-9]*[\-]*\w*)-[0-9]', pkgname_with_version, re.M)

            # Do not proceed unless we have a match
            if not pkg_search_obj:
                continue

            # Grab matched string
            pkgname_without_version = pkg_search_obj.group(1)

            if name != pkgname_without_version:
                continue

            # The package was found; now return its state
            if raw_state == '<':
                return 'outdated'
            elif raw_state == '=' or raw_state == '>':
                return 'present'
            else:
                return False
            # no fall-through

        # No packages were matched, so return False
        return False


def format_action_message(module, action, count):
    vars = { "actioned": action,
             "count":    count }

    if module.check_mode:
        message = "would have %(actioned)s %(count)d package" % vars
    else:
        message = "%(actioned)s %(count)d package" % vars

    if count == 1:
        return message
    else:
        return message + "s"


def format_pkgin_command(module, pkgin_path, command, package=None):
    # Not all commands take a package argument, so cover this up by passing
    # an empty string. Some commands (e.g. 'update') will ignore extra
    # arguments, however this behaviour cannot be relied on for others.
    if package is None:
        package = ""

    vars = { "pkgin":   pkgin_path,
             "command": command,
             "package": package }

    if module.check_mode:
        return "%(pkgin)s -n %(command)s %(package)s" % vars
    else:
        return "%(pkgin)s -y %(command)s %(package)s" % vars


def remove_packages(module, pkgin_path, packages):

    remove_c = 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, pkgin_path, package):
            continue

        rc, out, err = module.run_command(
            format_pkgin_command(module, pkgin_path, "remove", package))

        if not module.check_mode and query_package(module, pkgin_path, package):
            module.fail_json(msg="failed to remove %s: %s" % (package, out))

        remove_c += 1

    if remove_c > 0:
        module.exit_json(changed=True, msg=format_action_message(module, "removed", remove_c))

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


def install_packages(module, pkgin_path, packages):

    install_c = 0

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

        rc, out, err = module.run_command(
            format_pkgin_command(module, pkgin_path, "install", package))

        if not module.check_mode and not query_package(module, pkgin_path, package):
            module.fail_json(msg="failed to install %s: %s" % (package, out))

        install_c += 1

    if install_c > 0:
        module.exit_json(changed=True, msg=format_action_message(module, "installed", install_c))

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

def update_package_db(module, pkgin_path):
    rc, out, err = module.run_command(
        format_pkgin_command(module, pkgin_path, "update"))

    if rc == 0:
        return True
    else:
        module.fail_json(msg="could not update package db")


def main():
    module = AnsibleModule(
            argument_spec    = dict(
                state        = dict(default="present", choices=["present","absent"]),
                name         = dict(aliases=["pkg"], type='list'),
                update_cache = dict(default='no', type='bool')),
            required_one_of = [['name', 'update_cache']],
            supports_check_mode = True)

    pkgin_path = module.get_bin_path('pkgin', True, ['/opt/local/bin'])

    p = module.params

    pkgs = p["name"]

    if p["update_cache"]:
        update_package_db(module, pkgin_path)
        if not p['name']:
            module.exit_json(changed=True, msg='updated repository database')

    if p["state"] == "present":
        install_packages(module, pkgin_path, pkgs)

    elif p["state"] == "absent":
        remove_packages(module, pkgin_path, pkgs)

# import module snippets
from ansible.module_utils.basic import *

if __name__ == '__main__':
    main()