# (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

from ansible.errors import AnsibleParserError
from ansible.playbook.attribute import Attribute, FieldAttribute
from ansible.playbook.base import Base
from ansible.playbook.become import Become
from ansible.playbook.conditional import Conditional
from ansible.playbook.helpers import load_list_of_tasks
from ansible.playbook.role import Role
from ansible.playbook.taggable import Taggable

class Block(Base, Become, Conditional, Taggable):

    _block  = FieldAttribute(isa='list', default=[])
    _rescue = FieldAttribute(isa='list', default=[])
    _always = FieldAttribute(isa='list', default=[])
    _delegate_to = FieldAttribute(isa='list')
    _delegate_facts = FieldAttribute(isa='bool', default=False)
    _any_errors_fatal = FieldAttribute(isa='bool')

    # for future consideration? this would be functionally
    # similar to the 'else' clause for exceptions
    #_otherwise = FieldAttribute(isa='list')

    def __init__(self, play=None, parent_block=None, role=None, task_include=None, use_handlers=False, implicit=False):
        self._play         = play
        self._role         = role
        self._task_include = None
        self._parent_block = None
        self._use_handlers = use_handlers
        self._implicit     = implicit
        self._dep_chain    = []

        if task_include:
            self._task_include = task_include
        elif parent_block:
            self._parent_block = parent_block

        super(Block, self).__init__()

    def get_vars(self):
        '''
        Blocks do not store variables directly, however they may be a member
        of a role or task include which does, so return those if present.
        '''

        all_vars = self.vars.copy()

        if self._role:
            all_vars.update(self._role.get_vars(self._dep_chain))
        if self._parent_block:
            all_vars.update(self._parent_block.get_vars())
        if self._task_include:
            all_vars.update(self._task_include.get_vars())

        return all_vars

    @staticmethod
    def load(data, play=None, parent_block=None, role=None, task_include=None, use_handlers=False, variable_manager=None, loader=None):
        implicit = not Block.is_block(data)
        b = Block(play=play, parent_block=parent_block, role=role, task_include=task_include, use_handlers=use_handlers, implicit=implicit)
        return b.load_data(data, variable_manager=variable_manager, loader=loader)

    @staticmethod
    def is_block(ds):
        is_block = False
        if isinstance(ds, dict):
            for attr in ('block', 'rescue', 'always'):
                if attr in ds:
                    is_block = True
                    break
        return is_block

    def preprocess_data(self, ds):
        '''
        If a simple task is given, an implicit block for that single task
        is created, which goes in the main portion of the block
        '''

        if not Block.is_block(ds):
            if isinstance(ds, list):
                return super(Block, self).preprocess_data(dict(block=ds))
            else:
                return super(Block, self).preprocess_data(dict(block=[ds]))

        return super(Block, self).preprocess_data(ds)

    def _load_block(self, attr, ds):
        try:
            return load_list_of_tasks(
                ds,
                play=self._play,
                block=self,
                role=self._role,
                task_include=self._task_include,
                variable_manager=self._variable_manager,
                loader=self._loader,
                use_handlers=self._use_handlers,
            )
        except AssertionError:
            raise AnsibleParserError("A malformed block was encountered.", obj=self._ds)

    def _load_rescue(self, attr, ds):
        try:
            return load_list_of_tasks(
                ds,
                play=self._play,
                block=self,
                role=self._role,
                task_include=self._task_include,
                variable_manager=self._variable_manager,
                loader=self._loader,
                use_handlers=self._use_handlers,
            )
        except AssertionError:
            raise AnsibleParserError("A malformed block was encountered.", obj=self._ds)

    def _load_always(self, attr, ds):
        try:
            return load_list_of_tasks(
                ds, 
                play=self._play,
                block=self, 
                role=self._role, 
                task_include=self._task_include,
                variable_manager=self._variable_manager, 
                loader=self._loader, 
                use_handlers=self._use_handlers,
            )
        except AssertionError:
            raise AnsibleParserError("A malformed block was encountered.", obj=self._ds)

    def copy(self, exclude_parent=False, exclude_tasks=False):
        def _dupe_task_list(task_list, new_block):
            new_task_list = []
            for task in task_list:
                if isinstance(task, Block):
                    new_task = task.copy(exclude_parent=True)
                    new_task._parent_block = new_block
                else:
                    new_task = task.copy(exclude_block=True)
                    new_task._block = new_block
                new_task_list.
append(new_task)
            return new_task_list

        new_me
 = super(Block, self).copy()
        new_me._play         = self._play
        new_me._use_handlers = self._use_handlers
        new_me._dep_chain    = self._dep_chain[:]

        if not exclude_tasks:
            new_me.block  = _dupe_task_list(self.block or [], new_me)
            new_me.rescue = _dupe_task_list(self.rescue or [], new_me)
            new_me.always = _dupe_task_list(self.always or [], new_me)

        new_me._parent_block = None
        if self._parent_block and not exclude_parent:
            new_me._parent_block = self._parent_block.copy(exclude_tasks=exclude_tasks)

        new_me._role = None
        if self._role:
            new_me._role = self._role

        new_me._task_include = None
        if self._task_include:
            new_me._task_include = self._task_include.copy()

        return new_me

    def serialize(self):
        '''
        Override of the default serialize method, since when we're serializing
        a task we don't want to include the attribute list of tasks.
        '''

        data = dict()
        for attr in self._get_base_attributes():
            if attr not in ('block', 'rescue', 'always'):
                data[attr] = getattr(self, attr)

        data['dep_chain'] = self._dep_chain

        if self._role is not None:
            data['role'] = self._role.serialize()
        if self._task_include is not None:
            data['task_include'] = self._task_include.serialize()
        if self._parent_block is not None:
            data['parent_block'] = self._parent_block.copy(exclude_tasks=True).serialize()

        return data

    def deserialize(self, data):
        '''
        Override of the default deserialize method, to match the above overridden
        serialize method
        '''

        from ansible.playbook.task import Task

        # we don't want the full set of attributes (the task lists), as that
        # would lead to a serialize/deserialize loop
        for attr in self._get_base_attribut