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

# (c) 2012, Franck Cuny <franck@lumberjaph.net>
#
# 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: cpanm
short_description: Manages Perl library dependencies.
description:
  - Manage Perl library dependencies.
version_added: "1.0"
options:
  name:
    description:
      - The name of the Perl library to install
    required: false
    default: null
    aliases: ["pkg"]
  from_path:
    description:
      - The local directory from where to install
    required: false
    default: null
  notest:
    description:
      - Do not run unit tests
    required: false
    default: false
  locallib:
    description:
      - Specify the install base to install modules
    required: false
    default: false
  mirror:
    description:
      - Specifies the base URL for the CPAN mirror to use
    required: false
    default: false
examples:
   - code: "cpanm: name=Dancer"
     description: Install I(Dancer) perl package.
   - code: "cpanm: name=Dancer locallib=/srv/webapps/my_app/extlib"
     description: "Install I(Dancer) (U(http://perldancer.org/)) into the specified I(locallib)"
   - code: "cpanm: from_path=/srv/webapps/my_app/src/"
     description: Install perl dependencies from local directory.
   - code: "cpanm: name=Dancer notest=True locallib=/srv/webapps/my_app/extlib"
     description: Install I(Dancer) perl package without running the unit tests in indicated I(locallib).
   - code: "cpanm: name=Dancer mirror=http://cpan.cpantesters.org/"
     description: Install I(Dancer) perl package from a specific mirror
notes:
   - Please note that U(http://search.cpan.org/dist/App-cpanminus/bin/cpanm, cpanm) must be installed on the remote host.
author: Franck Cuny
'''

def _is_package_installed(name, locallib, cpanm):
    cmd = ""
    if locallib:
        cmd = "PERL5LIB={locallib}/lib/perl5".format(locallib=locallib)
    cmd = "{cmd} perl -M{name} -e '1'".format(cmd=cmd, name=name)
    res, stdout, stderr = _run(cmd)
    installed = True if res == 0 else False
    return installed


def _build_cmd_line(name, from_path, notest, locallib, mirror, cpanm):
    if from_path:
        cmd = "{cpanm} {path}".format(cpanm=cpanm, path=from_path)
    else:
        cmd = "{cpanm} {name}".format(cpanm=cpanm, name=name)

    if notest is True:
        cmd = "{cmd} -n".format(cmd=cmd)

    if locallib is not None:
        cmd = "{cmd} -l {locallib}".format(cmd=cmd, locallib=locallib)

    if mirror is not None:
        cmd = "{cmd} --mirror {mirror}".format(cmd=cmd, mirror=mirror)

    return cmd


def _run(cmd):
    process = subprocess.Popen(cmd, stdout=subprocess.PIPE,
                               stderr=subprocess.PIPE, shell=True)
    stdout, stderr = process.communicate()
    return (process.returncode, stdout, stderr)


def main():
    arg_spec = dict(
        name=dict(default=None, required=False, aliases=['pkg']),
        from_path=dict(default=None, required=False),
        notest=dict(default=False, choices=BOOLEANS),
        locallib=dict(default=None, required=False),
        mirror=dict(default=None, required=False)
    )

    module = AnsibleModule(
        argument_spec=arg_spec,
        required_one_of=[['name', 'from_path']],
    )

    cpanm = module.get_bin_path('cpanm', True)

    name = module.params['name']
    from_path = module.params['from_path']
    notest = module.boolean(module.params.get('notest', False))
    locallib = module.params['locallib']

    changed = False

    installed = _is_package_installed(name, locallib, cpanm)

    if not installed:
        out_cpanm = err_cpanm = ''
        cmd = _build_cmd_line(name, from_path, notest, locallib, mirror, cpanm)

        rc_cpanm, out_cpanm, err_cpanm = _run(cmd)

        if rc_cpanm != 0:
            module.fail_json(msg=err_cpanm, cmd=cmd)

        if err_cpanm and 'is up to date' not in err_cpanm:
            changed = True

    module.exit_json(changed=changed, binary=cpanm, name=name)


# include magic from lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()