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

# Authors:
#   Thomas Woerner <twoerner@redhat.com>
#
# Copyright (C) 2020 Red Hat
# see file 'COPYING' for use and warranty information
#
# This program 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 program 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 program.  If not, see <http://www.gnu.org/licenses/>.

ANSIBLE_METADATA = {
    "metadata_version": "1.0",
    "supported_by": "community",
    "status": ["preview"],
}

DOCUMENTATION = """
---
module: ipaselfservice
short description: Manage FreeIPA selfservices
description: Manage FreeIPA selfservices and selfservice attributes
options:
  ipaadmin_principal:
    description: The admin principal.
    default: admin
  ipaadmin_password:
    description: The admin password.
    required: false
  name:
    description: The list of selfservice name strings.
    required: true
    aliases: ["aciname"]
  permission:
    description: Permissions to grant (read, write). Default is write.
    required: false
    aliases: ["permissions"]
  attribute:
    description: Attribute list to which the selfservice applies
    required: false
    aliases: ["attrs"]
  action:
    description: Work on selfservice or member level.
    choices: ["selfservice", "member"]
    default: selfservice
    required: false
  state:
    description: The state to ensure.
    choices: ["present", "absent"]
    default: present
    required: true
"""

EXAMPLES = """
# Ensure selfservice "Users can manage their own name details" is present
- ipaselfservice:
    ipaadmin_password: SomeADMINpassword
    name: "Users can manage their own name details"
    permission: read
    attribute:
    - title
    - initials

# Ensure selfservice "Users can manage their own name details" member
# attribute departmentnumber is present
- ipaselfservice:
    ipaadmin_password: SomeADMINpassword
    name: "Users can manage their own name details"
    attribute:
    - initials
    action: member

# Ensure selfservice "Users can manage their own name details" member
# attributes employeetype and employeenumber are present
- ipaselfservice:
    ipaadmin_password: SomeADMINpassword
    name: "Users can manage their own name details"
    attribute:
    - title
    - initials
    action: member
    state: absent

# Ensure selfservice "Users can manage their own name details" is absent
- ipaselfservice:
    ipaadmin_password: SomeADMINpassword
    name: "Users can manage their own name details"
    state: absent
"""

RETURN = """
"""


from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.ansible_freeipa_module import \
    temp_kinit, temp_kdestroy, valid_creds, api_connect, api_command, \
    compare_args_ipa, module_params_get
import six


if six.PY3:
    unicode = str


def find_selfservice(module, name):
    """Find if a selfservice with the given name already exist."""
    try:
        _result = api_command(module, "selfservice_show", name, {"all": True})
    except Exception:  # pylint: disable=broad-except
        # An exception is raised if selfservice name is not found.
        return None
    else:
        return _result["result"]


def gen_args(permission, attribute):
    _args = {}
    if permission is not None:
        _args["permissions"] = permission
    if attribute is not None:
        _args["attrs"] = attribute
    return _args


def main():
    ansible_module = AnsibleModule(
        argument_spec=dict(
            # general
            ipaadmin_principal=dict(type="str", default="admin"),
            ipaadmin_password=dict(type="str", required=False, no_log=True),

            name=dict(type="list", aliases=["aciname"], default=None,
                      required=True),
            # present
            permission=dict(required=False, type='list',
                            aliases=["permissions"], default=None),
            attribute=dict(required=False, type='list', aliases=["attrs"],
                           default=None),
            action=dict(type="str", default="selfservice",
                        choices=["member", "selfservice"]),
            # state
            state=dict(type="str", default="present",
                       choices=["present", "absent"]),
        ),
        supports_check_mode=True,
    )

    ansible_module._ansible_debug = True

    # Get parameters

    # general
    ipaadmin_principal = module_params_get(ansible_module,
                                           "ipaadmin_principal")
    ipaadmin_password = module_params_get(ansible_module, "ipaadmin_password")
    names = module_params_get(ansible_module, "name")

    # present
    permission = module_params_get(ansible_module, "permission")
    attribute = module_params_get(ansible_module, "attribute")
    action = module_params_get(ansible_module, "action")
    # state
    state = module_params_get(ansible_module, "state")

    # Check parameters

    if state == "present":
        if len(names) != 1:
            ansible_module.fail_json(
                msg="Only one selfservice be added at a time.")
        if action == "member":
            invalid = ["permission"]
            for x in invalid:
                if vars()[x] is not None:
                    ansible_module.fail_json(
                        msg="Argument '%s' can not be used with action "
                        "'%s' and state '%s'" % (x, action, state))

    if state == "absent":
        if len(names) < 1:
            ansible_module.fail_json(msg="No name given.")
        invalid = ["permission"]
        if action == "selfservice":
            invalid.append("attribute")
        for x in invalid:
            if vars()[x] is not None:
                ansible_module.fail_json(
                    msg="Argument '%s' can not be used with action "
                    "'%s' and state '%s'" % (x, action, state))

    if permission is not None:
        perm = [p for p in permission if p not in ("read", "write")]
        if perm:
            ansible_module.fail_json(msg="Invalid permission '%s'" % perm)
        if len(set(permission)) != len(permission):
            ansible_module.fail_json(
                msg="Invalid permission '%s', items are not unique" %
                repr(permission))

    if attribute is not None:
        if len(set(attribute)) != len(attribute):
            ansible_module.fail_json(
                msg="Invalid attribute '%s', items are not unique" %
                repr(attribute))

    # Init

    changed = False
    exit_args = {}
    ccache_dir = None
    ccache_name = None
    try:
        if not valid_creds(ansible_module, ipaadmin_principal):
            ccache_dir, ccache_name = temp_kinit(ipaadmin_principal,
                                                 ipaadmin_password)
        api_connect()

        commands = []
        for name in names:
            # Make sure selfservice exists
            res_find = find_selfservice(ansible_module, name)

            # Create command
            if state == "present":

                # Generate args
                args = gen_args(permission, attribute)

                if action == "selfservice":
                    # Found the selfservice
                    if res_find is not None:
                        # For all settings is args, check if there are
                        # different settings in the find result.
                        # If yes: modify
                        if not compare_args_ipa(ansible_module, args,
                                                res_find):
                            commands.append([name, "selfservice_mod", args])
                    else:
                        commands.append([name, "selfservice_add", args])

                elif action == "member":
                    if res_find is None:
                        ansible_module.fail_json(
                            msg="No selfservice '%s'" % name)

                    if attribute is None:
                        ansible_module.fail_json(msg="No attributes given")

                    # New attribute list (add given ones to find result)
                    # Make list with unique entries
                    attrs = list(set(list(res_find["attrs"]) + attribute))
                    if len(attrs) > len(res_find["attrs"]):
                        commands.append([name, "selfservice_mod",
                                         {"attrs": attrs}])

            elif state == "absent":
                if action == "selfservice":
                    if res_find is not None:
                        commands.append([name, "selfservice_del", {}])

                elif action == "member":
                    if res_find is None:
                        ansible_module.fail_json(
                            msg="No selfservice '%s'" % name)

                    if attribute is None:
                        ansible_module.fail_json(msg="No attributes given")

                    # New attribute list (remove given ones from find result)
                    # Make list with unique entries
                    attrs = list(set(res_find["attrs"]) - set(attribute))
                    if len(attrs) < 1:
                        ansible_module.fail_json(
                            msg="At minimum one attribute is needed.")

                    # Entries New number of attributes is smaller
                    if len(attrs) < len(res_find["attrs"]):
                        commands.append([name, "selfservice_mod",
                                         {"attrs": attrs}])

            else:
                ansible_module.fail_json(msg="Unkown state '%s'" % state)

        # Check mode exit
        if ansible_module.check_mode:
            ansible_module.exit_json(changed=len(commands) > 0, **exit_args)

        # Execute commands

        for name, command, args in commands:
            try:
                result = api_command(ansible_module, command, name,
                                     args)
                if "completed" in result:
                    if result["completed"] > 0:
                        changed = True
                else:
                    changed = True
            except Exception as e:
                ansible_module.fail_json(msg="%s: %s: %s" % (command, name,
                                                             str(e)))

    except Exception as e:
        ansible_module.fail_json(msg=str(e))

    finally:
        temp_kdestroy(ccache_dir, ccache_name)

    # Done

    ansible_module.exit_json(changed=changed, **exit_args)


if __name__ == "__main__":
    main()