# (c) 2012, 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/>.

#############################################

from ansible import utils
from ansible import errors
from ansible.playbook.task import Task
import shlex
import os

class Play(object):

    __slots__ = [ 
       'hosts', 'name', 'vars', 'vars_prompt', 'vars_files', 
       'handlers', 'remote_user', 'remote_port',
       'sudo', 'sudo_user', 'transport', 'playbook', 
       'tags', 'gather_facts', '_ds', '_handlers', '_tasks'
    ]

    # to catch typos and so forth -- these are userland names
    # and don't line up 1:1 with how they are stored
    VALID_KEYS = [
       'hosts', 'name', 'vars', 'vars_prompt', 'vars_files',
       'tasks', 'handlers', 'user', 'port', 'include',
       'sudo', 'sudo_user', 'connection', 'tags', 'gather_facts'
    ]

    # *************************************************

    def __init__(self, playbook, ds):
        ''' constructor loads from a play datastructure '''

        for x in ds.keys():
             if not x in Play.VALID_KEYS:
                 raise errors.AnsibleError("%s is not a legal parameter in an Ansible Playbook" % x)

        # TODO: more error handling

        hosts = ds.get('hosts')
        if hosts is None:
            raise errors.AnsibleError('hosts declaration is required')
        elif isinstance(hosts, list):
            hosts = ';'.join(hosts)
        hosts = utils.template(hosts, playbook.extra_vars)

        self._ds          = ds
        self.playbook     = playbook
        self.hosts        = hosts 
        self.name         = ds.get('name', self.hosts)
        self.vars         = ds.get('vars', {})
        self.vars_files   = ds.get('vars_files', [])
        self.vars_prompt  = ds.get('vars_prompt', {})
        self.vars         = self._get_vars(self.playbook.basedir)
        self._tasks       = ds.get('tasks', [])
        self._handlers    = ds.get('handlers', [])
        self.remote_user  = ds.get('user', self.playbook.remote_user)
        self.remote_port  = ds.get('port', self.playbook.remote_port)
        self.sudo         = ds.get('sudo', self.playbook.sudo)
        self.sudo_user    = ds.get('sudo_user', self.playbook.sudo_user)
        self.transport    = ds.get('connection', self.playbook.transport)
        self.tags         = ds.get('tags', None)
        self.gather_facts = ds.get('gather_facts', True)

        self._update_vars_files_for_host(None)

        self._tasks      = self._load_tasks(self._ds, 'tasks')
        self._handlers   = self._load_tasks(self._ds, 'handlers')

        if self.tags is None:
            self.tags = []
        elif type(self.tags) in [ str, unicode ]:
            self.tags = [ self.tags ]
        elif type(self.tags) != list:
            self.tags = []

        if self.sudo_user != 'root':
            self.sudo = True

    # *************************************************

    def _load_tasks(self, ds, keyname):
        ''' handle task and handler include statements '''

        tasks = ds.get(keyname, [])
        results = []
        for x in tasks:
            task_vars = self.vars.copy()
            if 'include' in x:
                tokens = shlex.split(x['include'])

                for t in tokens[1:]:
                    (k,v) = t.split("=", 1)
                    task_vars[k]=v
                include_file = utils.template(tokens[0], task_vars)
                data = utils.parse_yaml_from_file(utils.path_dwim(self.playbook.basedir, include_file))
            elif type(x) == dict:
                data = [x]
            else:
                raise Exception("unexpected task type")
            for y in data:
                mv = task_vars.copy()
                results.append(Task(self,y,module_vars=mv))

        for x in results:
            if self.tags is not None:
                x.tags.extend(self.tags)

        return results

    # *************************************************

    def tasks(self):
        ''' return task objects for this play '''
        return self._tasks      

    def handlers(self):
        ''' return handler objects for this play '''
        return self._handlers

    # *************************************************

    def _get_vars(self, dirname):
        ''' load the vars section from a play, accounting for all sorts of variable features
        including loading from yaml files, prompting, and conditional includes of the first
        file found in a list. '''

        if self.vars is None:
            self.vars = {}

        if type(self.vars) not in [dict, list]:
            raise errors.AnsibleError("'vars' section must contain only key/value pairs")

        vars = self.playbook.global_vars
    
        # translate a list of vars into a dict
        if type(self.vars) == list:
            for item in self.vars:
                k, v = item.items()[0]
                vars[k] = v
        else:
            vars.update(self.vars)

        if type(self.vars_prompt) == list:
            for var in self.vars_prompt:
                if not 'name' in var:
                    raise errors.AnsibleError("'vars_prompt' item is missing 'name:'")
                vname = var['name']
                prompt = "%s: " % var.get("prompt", vname)
                private = var.get("private", True)
                vars[vname] = self.playbook.callbacks.on_vars_prompt(vname, private, prompt)
        elif type(self.vars_prompt) == dict:
            for (vname, prompt) in self.vars_prompt.iteritems():
                prompt = "%s: " % prompt
                vars[vname] = self.playbook.callbacks.on_vars_prompt(vname, False, prompt)
        else:
            raise errors.AnsibleError("'vars_prompt' section is malformed, see docs")

        results = self.playbook.extra_vars.copy()
        results.update(vars)
        return results

    # *************************************************

    def update_vars_files(self, hosts):
        ''' calculate vars_files, which requires that setup runs first so ansible facts can be mixed in '''
         
        # now loop through all the hosts...
        for h in hosts:
            self._update_vars_files_for_host(h)

    # *************************************************

    def should_run(self, tags):
        ''' does the play match any of the tags? '''

        tags_counted = 0
        for task in self._tasks:
            for task_tag in task.tags:
                tags_counted = tags_counted + 1
                if task_tag in tags:
                    return True

        if tags_counted > 0:
            return False  
   
        # didn't tag the play, and the play contains no steps
        # so assume we just want to gather facts
        return True                  

    # *************************************************

    def _has_vars_in(self, msg):
        return ((msg.find("$") != -1) or (msg.find("{{") != -1))

    # *************************************************

    def _update_vars_files_for_host(self, host):

        if type(self.vars_files) != list:
            self.vars_files = [ self.vars_files ]
 
        if (host is not None):
            inventory = self.playbook.inventory
            hostrec = inventory.get_host(host)
            groups = [ g.name for g in hostrec.groups ]
            basedir = inventory.basedir()
            if basedir is not None:
                for x in groups:
                    path = os.path.join(basedir, "group_vars/%s" % x)
                    if os.path.exists(path):
                        data = utils.parse_yaml_from_file(path)
                        if type(data) != dict:
                            raise errors.AnsibleError("%s must be stored as a dictionary/hash" % path)
                        self.playbook.SETUP_CACHE[host].update(data)
                path = os.path.join(basedir, "host_vars/%s" % hostrec.name)
                if os.path.exists(path):
                    data = utils.parse_yaml_from_file(path)
                    if type(data) != dict:
                        raise errors.AnsibleError("%s must be stored as a dictionary/hash" % path)
                    self.playbook.SETUP_CACHE[host].update(data)

        for filename in self.vars_files:

            if type(filename) == list:

                # loop over all filenames, loading the first one, and failing if # none found
                found = False
                sequence = []
                for real_filename in filename:
                    filename2 = utils.template(real_filename, self.vars)
                    filename3 = filename2
                    if host is not None:
                        filename3 = utils.template(filename2, self.playbook.SETUP_CACHE[host])
                    filename4 = utils.path_dwim(self.playbook.basedir, filename3)
                    sequence.append(filename4)
                    if os.path.exists(filename4):
                        found = True
                        data = utils.parse_yaml_from_file(filename4)
                        if type(data) != dict:
                            raise errors.AnsibleError("%s must be stored as a dictionary/hash" % filename4)
                        if host is not None:
                            if self._has_vars_in(filename2) and not self._has_vars_in(filename3):
                                # this filename has variables in it that were fact specific
                                # so it needs to be loaded into the per host SETUP_CACHE
                                self.playbook.SETUP_CACHE[host].update(data)
                                self.playbook.callbacks.on_import_for_host(host, filename4)
                        elif not self._has_vars_in(filename4):
                            # found a non-host specific variable, load into vars and NOT
                            # the setup cache
                            self.vars.update(data)
                    elif host is not None:
                        self.playbook.callbacks.on_not_import_for_host(host, filename4)
                    if found:
                        break
                if not found:
                    raise errors.AnsibleError(
                        "%s: FATAL, no files matched for vars_files import sequence: %s" % (host, sequence)
                    )

            else:
                # just one filename supplied, load it!

                filename2 = utils.template(filename, self.vars)
                filename3 = filename2
                if host is not None:
                    filename3 = utils.template(filename2, self.playbook.SETUP_CACHE[host])
                filename4 = utils.path_dwim(self.playbook.basedir, filename3)
                if self._has_vars_in(filename4):
                    return
                new_vars = utils.parse_yaml_from_file(filename4)
                if new_vars:
                    if type(new_vars) != dict:
                        raise errors.AnsibleError("%s must be stored as dictonary/hash: %s" % filename4)
                    if host is not None and self._has_vars_in(filename2) and not self._has_vars_in(filename3):
                        # running a host specific pass and has host specific variables
                        # load into setup cache 
                        self.playbook.SETUP_CACHE[host].update(new_vars)
                    elif host is None:
                        # running a non-host specific pass and we can update the global vars instead    
                        self.vars.update(new_vars)