# Copyright (c) 2018 Ansible Project
# 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

DOCUMENTATION = '''
    name: tower
    plugin_type: inventory
    author:
      - Matthew Jones (@matburt)
      - Yunfan Zhang (@YunfanZhang42)
    short_description: Ansible dynamic inventory plugin for Ansible Tower.
    description:
        - Reads inventories from Ansible Tower.
        - Supports reading configuration from both YAML config file and environment variables.
        - If reading from the YAML file, the file name must end with tower.(yml|yaml) or tower_inventory.(yml|yaml),
          the path in the command would be /path/to/tower_inventory.(yml|yaml). If some arguments in the config file
          are missing, this plugin will try to fill in missing arguments by reading from environment variables.
        - If reading configurations from environment variables, the path in the command must be @tower_inventory.
    options:
        host:
            description: The network address of your Ansible Tower host.
            env:
                - name: TOWER_HOST
        username:
            description: The user that you plan to use to access inventories on Ansible Tower.
            env:
                - name: TOWER_USERNAME
        password:
            description: The password for your Ansible Tower user.
            env:
                - name: TOWER_PASSWORD
        oauth_token:
            description:
                - The Tower OAuth token to use.
            env:
                - name: TOWER_OAUTH_TOKEN
        inventory_id:
            description:
                - The ID of the Ansible Tower inventory that you wish to import.
                - This is allowed to be either the inventory primary key or its named URL slug.
                - Primary key values will be accepted as strings or integers, and URL slugs must be strings.
                - Named URL slugs follow the syntax of "inventory_name++organization_name".
            type: raw
            env:
                - name: TOWER_INVENTORY
            required: True
        verify_ssl:
            description:
                - Specify whether Ansible should verify the SSL certificate of Ansible Tower host.
                - Defaults to True, but this is handled by the shared module_utils code
            type: bool
            env:
                - name: TOWER_VERIFY_SSL
            aliases: [ validate_certs ]
        include_metadata:
            description: Make extra requests to provide all group vars with metadata about the source Ansible Tower host.
            type: bool
            default: False
'''

EXAMPLES = '''
# Before you execute the following commands, you should make sure this file is in your plugin path,
# and you enabled this plugin.

# Example for using tower_inventory.yml file

plugin: awx.awx.tower
host: your_ansible_tower_server_network_address
username: your_ansible_tower_username
password: your_ansible_tower_password
inventory_id: the_ID_of_targeted_ansible_tower_inventory
# Then you can run the following command.
# If some of the arguments are missing, Ansible will attempt to read them from environment variables.
# ansible-inventory -i /path/to/tower_inventory.yml --list

# Example for reading from environment variables:

# Set environment variables:
# export TOWER_HOST=YOUR_TOWER_HOST_ADDRESS
# export TOWER_USERNAME=YOUR_TOWER_USERNAME
# export TOWER_PASSWORD=YOUR_TOWER_PASSWORD
# export TOWER_INVENTORY=THE_ID_OF_TARGETED_INVENTORY
# Read the inventory specified in TOWER_INVENTORY from Ansible Tower, and list them.
# The inventory path must always be @tower_inventory if you are reading all settings from environment variables.
# ansible-inventory -i @tower_inventory --list
'''

import os

from ansible.module_utils import six
from ansible.module_utils._text import to_text, to_native
from ansible.errors import AnsibleParserError, AnsibleOptionsError
from ansible.plugins.inventory import BaseInventoryPlugin
from ansible.config.manager import ensure_type

from ..module_utils.tower_api import TowerModule


def handle_error(**kwargs):
    raise AnsibleParserError(to_native(kwargs.get('msg')))


class InventoryModule(BaseInventoryPlugin):
    NAME = 'awx.awx.tower'  # REPLACE
    # Stays backward compatible with tower inventory script.
    # If the user supplies '@tower_inventory' as path, the plugin will read from environment variables.
    no_config_file_supplied = False

    def verify_file(self, path):
        if path.endswith('@tower_inventory'):
            self.no_config_file_supplied = True
            return True
        elif super(InventoryModule, self).verify_file(path):
            return path.endswith(('tower_inventory.yml', 'tower_inventory.yaml', 'tower.yml', 'tower.yaml'))
        else:
            return False

    def warn_callback(self, warning):
        self.display.warning(warning)

    def parse(self, inventory, loader, path, cache=True):
        super(InventoryModule, self).parse(inventory, loader, path)
        if not self.no_config_file_supplied and os.path.isfile(path):
            self._read_config_data(path)

        # Defer processing of params to logic shared with the modules
        module_params = {}
        for plugin_param, module_param in TowerModule.short_params.items():
            opt_val = self.get_option(plugin_param)
            if opt_val is not None:
                module_params[module_param] = opt_val

        module = TowerModule(
            argument_spec={}, direct_params=module_params,
            error_callback=handle_error, warn_callback=self.warn_callback
        )

        # validate type of inventory_id because we allow two types as special case
        inventory_id = self.get_option('inventory_id')
        if isinstance(inventory_id, int):
            inventory_id = to_text(inventory_id, nonstring='simplerepr')
        else:
            try:
                inventory_id = ensure_type(inventory_id, 'str')
            except ValueError as e:
                raise AnsibleOptionsError(
                    'Invalid type for configuration option inventory_id, '
                    'not integer, and cannot convert to string: {err}'.format(err=to_native(e))
                )
        inventory_id = inventory_id.replace('/', '')
        inventory_url = '/api/v2/inventories/{inv_id}/script/'.format(inv_id=inventory_id)

        inventory = module.get_endpoint(
            inventory_url, data={'hostvars': '1', 'towervars': '1', 'all': '1'}
        )['json']

        # To start with, create all the groups.
        for group_name in inventory:
            if group_name != '_meta':
                self.inventory.add_group(group_name)

        # Then, create all hosts and add the host vars.
        all_hosts = inventory['_meta']['hostvars']
        for host_name, host_vars in six.iteritems(all_hosts):
            self.inventory.add_host(host_name)
            for var_name, var_value in six.iteritems(host_vars):
                self.inventory.set_variable(host_name, var_name, var_value)

        # Lastly, create to group-host and group-group relationships, and set group vars.
        for group_name, group_content in six.iteritems(inventory):
            if group_name != 'all' and group_name != '_meta':
                # First add hosts to groups
                for host_name in group_content.get('hosts', []):
                    self.inventory.add_host(host_name, group_name)
                # Then add the parent-children group relationships.
                for child_group_name in group_content.get('children', []):
                    self.inventory.add_child(group_name, child_group_name)
            # Set the group vars. Note we should set group var for 'all', but not '_meta'.
            if group_name != '_meta':
                for var_name, var_value in six.iteritems(group_content.get('vars', {})):
                    self.inventory.set_variable(group_name, var_name, var_value)

        # Fetch extra variables if told to do so
        if self.get_option('include_metadata'):

            config_data = module.get_endpoint('/api/v2/config/')['json']

            server_data = {}
            server_data['license_type'] = config_data.get('license_info', {}).get('license_type', 'unknown')
            for key in ('version', 'ansible_version'):
                server_data[key] = config_data.get(key, 'unknown')
            self.inventory.set_variable('all', 'tower_metadata', server_data)

        # Clean up the inventory.
        self.inventory.reconcile_inventory()
