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

# (c) 2013, Patrick Pelletier <pp.pelletier@gmail.com>
# Based on pacman (Afterburn) and pkgin (Shaun Zinck) modules
#
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

from __future__ import absolute_import, division, print_function
__metaclass__ = type


ANSIBLE_METADATA = {'metadata_version': '1.1',
                    'status': ['preview'],
                    'supported_by': 'community'}


DOCUMENTATION = '''
---
module: opkg
author: "Patrick Pelletier (@skinp)"
short_description: Package manager for OpenWrt
description:
    - Manages OpenWrt packages
version_added: "1.1"
options:
    name:
        description:
            - name of package to install/remove
        required: true
    state:
        description:
            - state of the package
        choices: [ 'present', 'absent' ]
        default: present
    force:
        description:
            - opkg --force parameter used
        choices:
            - ""
            - "depends"
            - "maintainer"
            - "reinstall"
            - "overwrite"
            - "downgrade"
            - "space"
            - "postinstall"
            - "remove"
            - "checksum"
            - "removal-of-dependent-packages"
        default: absent
        version_added: "2.0"
    update_cache:
        description:
            - update the package db first
        default: "no"
        type: bool
requirements:
    - opkg
    - python
'''
EXAMPLES = '''
- opkg:
    name: foo
    state: present

- opkg:
    name: foo
    state: present
    update_cache: yes

- opkg:
    name: foo
    state: absent

- opkg:
    name: foo,bar
    state: absent

- opkg:
    name: foo
    state: present
    force: overwrite
'''

from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.six.moves import shlex_quote


def update_package_db(module, opkg_path):
    """ Updates packages list. """

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

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


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

    if state == "present":

        rc, out, err = module.run_command("%s list-installed | grep -q \"^%s \"" % (shlex_quote(opkg_path), shlex_quote(name)), use_unsafe_shell=True)
        if rc == 0:
            return True

        return False


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

    p = module.params
    force = p["force"]
    if force:
        force = "--force-%s" % force

    remove_c = 0
    # Using a for loop in case 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, opkg_path, package):
            continue

        rc, out, err = module.run_command("%s remove %s %s" % (opkg_path, force, package))

        if query_package(module, opkg_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="removed %s package(s)" % remove_c)

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


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

    p = module.params
    force = p["force"]
    if force:
        force = "--force-%s" % force

    install_c = 0

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

        rc, out, err = module.run_command("%s install %s %s" % (opkg_path, force, package))

        if not query_package(module, opkg_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="installed %s package(s)" % (install_c))

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


def main():
    module = AnsibleModule(
        argument_spec=dict(
            name=dict(aliases=["pkg"], required=True),
            state=dict(default="present", choices=["present", "installed", "absent", "removed"]),
            force=dict(default="", choices=["", "depends", "maintainer", "reinstall", "overwrite", "downgrade", "space", "postinstall", "remove",
                                            "checksum", "removal-of-dependent-packages"]),
            update_cache=dict(default="no", aliases=["update-cache"], type='bool')
        )
    )

    opkg_path = module.get_bin_path('opkg', True, ['/bin'])

    p = module.params

    if p["update_cache"]:
        update_package_db(module, opkg_path)

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

    if p["state"] in ["present", "installed"]:
        install_packages(module, opkg_path, pkgs)

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


if __name__ == '__main__':
    main()