# (c) 2012-2014, Michael DeHaan <michael.dehaan@gmail.com>
#
# 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/>.

# Make coding more python3-ish
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

import ansible.constants as C
from ansible.errors import AnsibleParserError
from ansible.playbook.attribute import FieldAttribute
from ansible.playbook.block import Block
from ansible.playbook.task import Task
from ansible.utils.display import Display
from ansible.utils.sentinel import Sentinel

__all__ = ['TaskInclude']

display = Display()


class TaskInclude(Task):

    """
    A task include is derived from a regular task to handle the special
    circumstances related to the `- include: ...` task.
    """

    BASE = frozenset(('file', '_raw_params'))  # directly assigned
    OTHER_ARGS = frozenset(('apply',))  # assigned to matching property
    VALID_ARGS = BASE.union(OTHER_ARGS)  # all valid args
    VALID_INCLUDE_KEYWORDS = frozenset(('action', 'args', 'collections', 'debugger', 'ignore_errors', 'loop', 'loop_control',
                                        'loop_with', 'name', 'no_log', 'register', 'run_once', 'tags', 'timeout', 'vars',
                                        'when'))

    # =================================================================================
    # ATTRIBUTES

    _static = FieldAttribute(isa='bool', default=None)

    def __init__(self, block=None, role=None, task_include=None):
        super(TaskInclude, self).__init__(block=block, role=role, task_include=task_include)
        self.statically_loaded = False

    @staticmethod
    def load(data, block=None, role=None, task_include=None, variable_manager=None, loader=None):
        ti = TaskInclude(block=block, role=role, task_include=task_include)
        task = ti.check_options(
            ti.load_data(data, variable_manager=variable_manager, loader=loader),
            data
        )

        return task

    def check_options(self, task, data):
        '''
        Method for options validation to use in 'load_data' for TaskInclude and HandlerTaskInclude
        since they share the same validations. It is not named 'validate_options' on purpose
        to prevent confusion with '_validate_*" methods. Note that the task passed might be changed
        as a side-effect of this method.
        '''
        my_arg_names = frozenset(task.args.keys())

        # validate bad args, otherwise we silently ignore
        bad_opts = my_arg_names.difference(self.VALID_ARGS)
        if bad_opts and task.action in C._ACTION_ALL_PROPER_INCLUDE_IMPORT_TASKS:
            raise AnsibleParserError('Invalid options for %s: %s' % (task.action, ','.join(list(bad_opts))), obj=data)

        if not task.args.get('_raw_params'):
            task.args['_raw_params'] = task.args.pop('file', None)
            if not task.args['_raw_params']:
                raise AnsibleParserError('No file specified for %s' % task.action)

        apply_attrs = task.args.get('apply', {})
        if apply_attrs and task.action not in C._ACTION_INCLUDE_TASKS:
            raise AnsibleParserError('Invalid options for %s: apply' % task.action, obj=data)
        elif not isinstance(apply_attrs, dict):
            raise AnsibleParserError('Expected a dict for apply but got %s instead' % type(apply_attrs), obj=data)

        return task

    def preprocess_data(self, ds):
        ds = super(TaskInclude, self).preprocess_data(ds)

        diff = set(ds.keys()).difference(self.VALID_INCLUDE_KEYWORDS)
        for k in diff:
            # This check doesn't handle ``include`` as we have no idea at this point if it is static or not
            if ds[k] is not Sentinel and ds['action'] in C._ACTION_ALL_INCLUDE_ROLE_TASKS:
                if C.INVALID_TASK_ATTRIBUTE_FAILED:
                    raise AnsibleParserError("'%s' is not a valid attribute for a %s" % (k, self.__class__.__name__), obj=ds)
                else:
                    display.warning("Ignoring invalid attribute: %s" % k)

        return ds

    def copy(self, exclude_parent=False, exclude_tasks=False):
        new_me = super(TaskInclude, self).copy(exclude_parent=exclude_parent, exclude_tasks=exclude_tasks)
        new_me.statically_loaded = self.statically_loaded
        return new_me

    def get_vars(self):
        '''
        We override the parent Task() classes get_vars here because
        we need to include the args of the include into the vars as
        they are params to the included tasks. But ONLY for 'include'
        '''
        if self.action not in C._ACTION_INCLUDE:
            all_vars = super(TaskInclude, self).get_vars()
        else:
            all_vars = dict()
            if self._parent:
                all_vars.update(self._parent.get_vars())

            all_vars.update(self.vars)
            all_vars.update(self.args)

            if 'tags' in all_vars:
                del all_vars['tags']
            if 'when' in all_vars:
                del all_vars['when']

        return all_vars

    def build_parent_block(self):
        '''
        This method is used to create the parent block for the included tasks
        when ``apply`` is specified
        '''
        apply_attrs = self.args.pop('apply', {})
        if apply_attrs:
            apply_attrs['block'] = []
            p_block = Block.load(
                apply_attrs,
                play=self._parent._play,
                task_include=self,
                role=self._role,
                variable_manager=self._variable_manager,
                loader=self._loader,
            )
        else:
            p_block = self

        return p_block