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

#
# (c) 2015, Mark Hamilton <mhamilton@vmware.com>
# Portions copyright @ 2015 VMware, Inc.
# 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': 'network'}


DOCUMENTATION = """
---
module: openvswitch_db
author: "Mark Hamilton (mhamilton@vmware.com)"
version_added: 2.0
short_description: Configure open vswitch database.
requirements: [ "ovs-vsctl >= 2.3.3" ]
description:
    - Set column values in record in database table.
options:
    state:
        required: false
        description:
            - Configures the state of the key. When set
              to I(present), the I(key) and I(value) pair will be set
              on the I(record) and when set to I(absent) the I(key)
              will not be set.
        default: present
        choices: ['present', 'absent']
        version_added: "2.4"
    table:
        required: true
        description:
            - Identifies the table in the database.
    record:
        required: true
        description:
            - Identifies the recoard in the table.
    col:
        required: true
        description:
            - Identifies the column in the record.
    key:
        required: true
        description:
            - Identifies the key in the record column
    value:
        required: true
        description:
            - Expected value for the table, record, column and key.
    timeout:
        required: false
        default: 5
        description:
            - How long to wait for ovs-vswitchd to respond
"""

EXAMPLES = '''
# Increase the maximum idle time to 50 seconds before pruning unused kernel
# rules.
- openvswitch_db:
    table: open_vswitch
    record: .
    col: other_config
    key: max-idle
    value: 50000

# Disable in band copy
- openvswitch_db:
    table: Bridge
    record: br-int
    col: other_config
    key: disable-in-band
    value: true

# Remove in band key
- openvswitch_db:
    state: present
    table: Bridge
    record: br-int
    col: other_config
    key: disable-in-band
'''
import re

from ansible.module_utils.basic import AnsibleModule


def map_obj_to_commands(want, have, module):
    """ Define ovs-vsctl command to meet desired state """
    commands = list()

    if module.params['state'] == 'absent':
        if 'key' in have.keys():
            templatized_command = "%(ovs-vsctl)s -t %(timeout)s remove %(table)s %(record)s " \
                                  "%(col)s %(key)s=%(value)s"
            commands.append(templatized_command % module.params)
    else:
        if 'key' not in have.keys():
            templatized_command = "%(ovs-vsctl)s -t %(timeout)s add %(table)s %(record)s " \
                                  "%(col)s %(key)s=%(value)s"
            commands.append(templatized_command % module.params)
        elif want['value'] != have['value']:
            templatized_command = "%(ovs-vsctl)s -t %(timeout)s set %(table)s %(record)s " \
                                  "%(col)s:%(key)s=%(value)s"
            commands.append(templatized_command % module.params)

    return commands


def map_config_to_obj(module):
    templatized_command = "%(ovs-vsctl)s -t %(timeout)s list %(table)s %(record)s"
    command = templatized_command % module.params
    rc, out, err = module.run_command(command, check_rc=True)
    if rc != 0:
        module.fail_json(msg=err)

    match = re.search(r'^' + module.params['col'] + r'(\s+):(\s+)(.*)$', out, re.M)

    col_value = match.group(3)
    col_value_to_dict = {}
    if col_value and col_value != '{}':
        for kv in col_value[1:-1].split(', '):
            k, v = kv.split('=')
            col_value_to_dict[k.strip()] = v.strip()

    obj = {
        'table': module.params['table'],
        'record': module.params['record'],
        'col': module.params['col'],
    }

    if module.params['key'] in col_value_to_dict:
        obj['key'] = module.params['key']
        obj['value'] = col_value_to_dict[module.params['key']]

    return obj


def map_params_to_obj(module):
    obj = {
        'table': module.params['table'],
        'record': module.params['record'],
        'col': module.params['col'],
        'key': module.params['key'],
        'value': module.params['value']
    }

    return obj


def main():
    """ Entry point for ansible module. """
    argument_spec = {
        'state': {'default': 'present', 'choices': ['present', 'absent']},
        'table': {'required': True},
        'record': {'required': True},
        'col': {'required': True},
        'key': {'required': True},
        'value': {'required': True},
        'timeout': {'default': 5, 'type': 'int'},
    }

    module = AnsibleModule(argument_spec=argument_spec,
                           supports_check_mode=True)

    result = {'changed': False}

    # We add ovs-vsctl to module_params to later build up templatized commands
    module.params["ovs-vsctl"] = module.get_bin_path("ovs-vsctl", True)

    want = map_params_to_obj(module)
    have = map_config_to_obj(module)

    commands = map_obj_to_commands(want, have, module)
    result['commands'] = commands

    if commands:
        if not module.check_mode:
            for c in commands:
                module.run_command(c, check_rc=True)
        result['changed'] = True

    module.exit_json(**result)


if __name__ == '__main__':
    main()
