# execute_module

from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

import json
import pipes

from ansible.compat.six import text_type, iteritems

from ansible import constants as C
from ansible.errors import AnsibleError
from ansible.release import __version__

try:
    from __main__ import display
except ImportError:
    from ansible.utils.display import Display
    display = Display()


class MagicStackBase(object):

    def _mount_nfs(self, ansible_nfs_src, ansible_nfs_dest):
        cmd = ['mount',ansible_nfs_src, ansible_nfs_dest]
        cmd = [pipes.quote(c) for c in cmd]
        cmd = ' '.join(cmd)
        result = self._low_level_execute_command(cmd=cmd, sudoable=True)
        return result

    def _umount_nfs(self, ansible_nfs_dest):
        cmd = ['umount', ansible_nfs_dest]
        cmd = [pipes.quote(c) for c in cmd]
        cmd = ' '.join(cmd)
        result = self._low_level_execute_command(cmd=cmd, sudoable=True)
        return result

    def _execute_module(self, module_name=None, module_args=None, tmp=None, task_vars=None, persist_files=False, delete_remote_tmp=True):
        '''
        Transfer and run a module along with its arguments.
        '''

        # display.v(task_vars)

        if task_vars is None:
            task_vars = dict()

        # if a module name was not specified for this execution, use
        # the action from the task
        if module_name is None:
            module_name = self._task.action
        if module_args is None:
            module_args = self._task.args

        # set check mode in the module arguments, if required
        if self._play_context.check_mode:
            if not self._supports_check_mode:
                raise AnsibleError("check mode is not supported for this operation")
            module_args['_ansible_check_mode'] = True
        else:
            module_args['_ansible_check_mode'] = False

        # Get the connection user for permission checks
        remote_user = task_vars.get('ansible_ssh_user') or self._play_context.remote_user

        # set no log in the module arguments, if required
        module_args['_ansible_no_log'] = self._play_context.no_log or C.DEFAULT_NO_TARGET_SYSLOG

        # set debug in the module arguments, if required
        module_args['_ansible_debug'] = C.DEFAULT_DEBUG

        # let module know we are in diff mode
        module_args['_ansible_diff'] = self._play_context.diff

        # let module know our verbosity
        module_args['_ansible_verbosity'] = display.verbosity

        # give the module information about the ansible version
        module_args['_ansible_version'] = __version__

        # set the syslog facility to be used in the module
        module_args['_ansible_syslog_facility'] = task_vars.get('ansible_syslog_facility', C.DEFAULT_SYSLOG_FACILITY)

        # let module know about filesystems that selinux treats specially
        module_args['_ansible_selinux_special_fs'] = C.DEFAULT_SELINUX_SPECIAL_FS

        (module_style, shebang, module_data) = self._configure_module(module_name=module_name, module_args=module_args, task_vars=task_vars)
        if not shebang:
            raise AnsibleError("module (%s) is missing interpreter line" % module_name)

        # get nfs info for mount python packages
        ansible_nfs_src = task_vars.get("ansible_nfs_src", None)
        ansible_nfs_dest = task_vars.get("ansible_nfs_dest", None)

        # a remote tmp path may be necessary and not already created
        remote_module_path = None
        args_file_path = None
        if not tmp and self._late_needs_tmp_path(tmp, module_style):
            tmp = self._make_tmp_path(remote_user)

        if tmp:
            remote_module_filename = self._connection._shell.get_remote_filename(module_name)
            remote_module_path = self._connection._shell.join_path(tmp, remote_module_filename)
            if module_style in ['old', 'non_native_want_json']:
                # we'll also need a temp file to hold our module arguments
                args_file_path = self._connection._shell.join_path(tmp, 'args')

        if remote_module_path or module_style != 'new':
            display.debug("transferring module to remote")
            self._transfer_data(remote_module_path, module_data)
            if module_style == 'old':
                # we need to dump the module args to a k=v string in a file on
                # the remote system, which can be read and parsed by the module
                args_data = ""
                for k,v in iteritems(module_args):
                    args_data += '%s=%s ' % (k, pipes.quote(text_type(v)))
                self._transfer_data(args_file_path, args_data)
            elif module_style == 'non_native_want_json':
                self._transfer_data(args_file_path, json.dumps(module_args))
            display.debug("done transferring module to remote")

        environment_string = self._compute_environment_string()

        remote_files = None

        if args_file_path:
            remote_files = tmp, remote_module_path, args_file_path
        elif remote_module_path:
            remote_files = tmp, remote_module_path

        # Fix permissions of the tmp path and tmp files.  This should be
        # called after all files have been transferred.
        if remote_files:
            self._fixup_perms2(remote_files, remote_user)


        # mount nfs
        if ansible_nfs_src and ansible_nfs_dest:
            result = self._mount_nfs(ansible_nfs_src, ansible_nfs_dest)
            if result['rc'] != 0:
                raise AnsibleError("mount nfs failed!!! {0}".format(result['stderr']))

        cmd = ""
        in_data = None

        if self._connection.has_pipelining and self._play_context.pipelining and not C.DEFAULT_KEEP_REMOTE_FILES and module_style == 'new':
            in_data = module_data
        else:
            if remote_module_path:
                cmd = remote_module_path

        rm_tmp = None
        if tmp and "tmp" in tmp and not C.DEFAULT_KEEP_REMOTE_FILES and not persist_files and delete_remote_tmp:
            if not self._play_context.become or self._play_context.become_user == 'root':
                # not sudoing or sudoing to root, so can cleanup files in the same step
                rm_tmp = tmp

        cmd = self._connection._shell.build_module_command(environment_string, shebang, cmd, arg_path=args_file_path, rm_tmp=rm_tmp)
        cmd = cmd.strip()
        sudoable = True
        if module_name == "accelerate":
            # always run the accelerate module as the user
            # specified in the play, not the sudo_user
            sudoable = False


        res = self._low_level_execute_command(cmd, sudoable=sudoable, in_data=in_data)

        # umount nfs
        if ansible_nfs_src and ansible_nfs_dest:
            result = self._umount_nfs(ansible_nfs_dest)
            if result['rc'] != 0:
                raise AnsibleError("umount nfs failed!!! {0}".format(result['stderr']))

        if tmp and "tmp" in tmp and not C.DEFAULT_KEEP_REMOTE_FILES and not persist_files and delete_remote_tmp:
            if self._play_context.become and self._play_context.become_user != 'root':
                # not sudoing to root, so maybe can't delete files as that other user
                # have to clean up temp files as original user in a second step
                tmp_rm_cmd = self._connection._shell.remove(tmp, recurse=True)
                tmp_rm_res = self._low_level_execute_command(tmp_rm_cmd, sudoable=False)
                tmp_rm_data = self._parse_returned_data(tmp_rm_res)
                if tmp_rm_data.get('rc', 0) != 0:
                    display.warning('Error deleting remote temporary files (rc: {0}, stderr: {1})'.format(tmp_rm_res.get('rc'), tmp_rm_res.get('stderr', 'No error string available.')))

        # parse the main result
        data = self._parse_returned_data(res)

        # pre-split stdout into lines, if stdout is in the data and there
        # isn't already a stdout_lines value there
        if 'stdout' in data and 'stdout_lines' not in data:
            data['stdout_lines'] = data.get('stdout', u'').splitlines()

        display.debug("done with _execute_module (%s, %s)" % (module_name, module_args))
        return data