# This file is part of Buildbot.  Buildbot 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, version 2.
#
# This program 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
# this program; if not, write to the Free Software Foundation, Inc., 51
# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# Copyright Buildbot Team Members


from twisted.internet import defer
from twisted.python import log

from buildbot.process.buildstep import BuildStep
from buildbot.process.buildstep import ShellMixin
from buildbot.process.results import EXCEPTION
from buildbot.process.results import FAILURE
from buildbot.process.results import SUCCESS
from buildbot.process.results import WARNINGS


class Robocopy(ShellMixin, BuildStep):

    """ Robocopy build step.

    This is just a wrapper around the standard shell command that
    will handle arguments and return codes accordingly for Robocopy.
    """
    renderables = [
        'custom_opts',
        'destination',
        'exclude_dirs',
        'exclude_files',
        'files',
        'source'
    ]

    # Robocopy exit flags (they are combined to make up the exit code)
    # See: http://ss64.com/nt/robocopy-exit.html
    return_flags = {
        FAILURE: [8, 16],
        WARNINGS: [2, 4],
        SUCCESS: [0, 1]
    }

    def __init__(self, source, destination,
                 exclude=None,
                 exclude_files=None,
                 **kwargs):
        self.source = source
        self.destination = destination

        self.files = kwargs.pop('files', None)
        self.recursive = kwargs.pop('recursive', False)
        self.mirror = kwargs.pop('mirror', False)
        self.move = kwargs.pop('move', False)

        self.exclude_files = exclude_files
        if exclude and not exclude_files:
            self.exclude_files = exclude

        self.exclude_dirs = kwargs.pop('exclude_dirs', None)
        self.custom_opts = kwargs.pop('custom_opts', None)
        self.verbose = kwargs.pop('verbose', False)

        super().__init__(**kwargs)

    @defer.inlineCallbacks
    def run(self):
        command = ['robocopy', self.source, self.destination]
        if self.files:
            command += self.files
        if self.recursive:
            command.append('/E')
        if self.mirror:
            command.append('/MIR')
        if self.move:
            command.append('/MOVE')
        if self.exclude_files:
            command.append('/XF')
            command += self.exclude_files
        if self.exclude_dirs:
            command.append('/XD')
            command += self.exclude_dirs
        if self.verbose:
            command += ['/V', '/TS', '/FP']
        if self.custom_opts:
            command += self.custom_opts
        command += ['/TEE', '/NP']

        cmd = yield self.makeRemoteShellCommand(command=command)

        yield self.runCommand(cmd)

        # If we have a "clean" return code, it's good.
        # Otherwise, look for errors first, warnings second.
        if cmd.rc == 0 or cmd.rc == 1:
            return SUCCESS
        for result in [FAILURE, WARNINGS]:
            for flag in self.return_flags[result]:
                if (cmd.rc & flag) == flag:
                    return result

        log.msg("Unknown return code for Robocopy: {}".format(cmd.rc))
        return EXCEPTION
