# Copyright (C) 2005, 2006, 2007, 2009, 2010, 2011 Canonical Ltd
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# 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

"""\
This contains functionality for installing bundles into repositories
"""

from __future__ import absolute_import

from bzrlib import ui
from bzrlib.i18n import gettext
from bzrlib.merge import Merger
from bzrlib.progress import ProgressPhase
from bzrlib.trace import note
from bzrlib.vf_repository import install_revision


def install_bundle(repository, bundle_reader):
    custom_install = getattr(bundle_reader, 'install', None)
    if custom_install is not None:
        return custom_install(repository)
    pb = ui.ui_factory.nested_progress_bar()
    repository.lock_write()
    try:
        real_revisions = bundle_reader.real_revisions
        for i, revision in enumerate(reversed(real_revisions)):
            pb.update(gettext("Install revisions"),i, len(real_revisions))
            if repository.has_revision(revision.revision_id):
                continue
            cset_tree = bundle_reader.revision_tree(repository,
                                                       revision.revision_id)
            install_revision(repository, revision, cset_tree)
    finally:
        repository.unlock()
        pb.finished()


def merge_bundle(reader, tree, check_clean, merge_type,
                    reprocess, show_base, change_reporter=None):
    """Merge a revision bundle into the current tree."""
    pb = ui.ui_factory.nested_progress_bar()
    try:
        pp = ProgressPhase("Merge phase", 6, pb)
        pp.next_phase()
        install_bundle(tree.branch.repository, reader)
        merger = Merger(tree.branch, this_tree=tree,
                        change_reporter=change_reporter)
        merger.pp = pp
        merger.pp.next_phase()
        if check_clean and tree.has_changes():
            raise errors.UncommittedChanges(self)
        merger.other_rev_id = reader.target
        merger.other_tree = merger.revision_tree(reader.target)
        merger.other_basis = reader.target
        merger.pp.next_phase()
        merger.find_base()
        if merger.base_rev_id == merger.other_rev_id:
            note(gettext("Nothing to do."))
            return 0
        merger.merge_type = merge_type
        merger.show_base = show_base
        merger.reprocess = reprocess
        conflicts = merger.do_merge()
        merger.set_pending()
    finally:
        pb.clear()
    return conflicts