# Copyright (C) 2009, 2010 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

"""Tests for InterBranch.pull behaviour."""

from breezy import errors
from breezy.branch import BindingUnsupported, Branch
from breezy.controldir import ControlDir
from breezy.revision import NULL_REVISION
from breezy.tests import TestNotApplicable
from breezy.tests.per_interbranch import TestCaseWithInterBranch

# The tests here are based on the tests in
# breezy.tests.per_branch.test_pull


class TestPull(TestCaseWithInterBranch):
    def test_pull_convergence_simple(self):
        # when revisions are pulled, the left-most accessible parents must
        # become the revision-history.
        parent = self.make_from_branch_and_tree("parent")
        parent.commit("1st post", allow_pointless=True)
        try:
            mine = self.sprout_to(parent.controldir, "mine").open_workingtree()
        except errors.NoRoundtrippingSupport:
            raise TestNotApplicable(
                "lossless push between {!r} and {!r} not supported".format(
                    self.branch_format_from, self.branch_format_to
                )
            )
        mine.commit("my change", allow_pointless=True)
        try:
            parent.merge_from_branch(mine.branch)
        except errors.NoRoundtrippingSupport:
            raise TestNotApplicable(
                "lossless push between {!r} and {!r} not supported".format(
                    self.branch_format_from, self.branch_format_to
                )
            )
        p2 = parent.commit("merge my change")
        mine.pull(parent.branch)
        self.assertEqual(p2, mine.branch.last_revision())

    def test_pull_merged_indirect(self):
        # it should be possible to do a pull from one branch into another
        # when the tip of the target was merged into the source branch
        # via a third branch - so its buried in the ancestry and is not
        # directly accessible.
        parent = self.make_from_branch_and_tree("parent")
        parent.commit("1st post", allow_pointless=True)
        try:
            mine = self.sprout_to(parent.controldir, "mine").open_workingtree()
        except errors.NoRoundtrippingSupport:
            raise TestNotApplicable(
                "lossless push between {!r} and {!r} not supported".format(
                    self.branch_format_from, self.branch_format_to
                )
            )
        mine.commit("my change", allow_pointless=True)
        other = self.sprout_to(parent.controldir, "other").open_workingtree()
        other.merge_from_branch(mine.branch)
        other.commit("merge my change")
        try:
            parent.merge_from_branch(other.branch)
        except errors.NoRoundtrippingSupport:
            raise TestNotApplicable(
                "lossless push between {!r} and {!r} not supported".format(
                    self.branch_format_from, self.branch_format_to
                )
            )
        p2 = parent.commit("merge other")
        mine.pull(parent.branch)
        self.assertEqual(p2, mine.branch.last_revision())

    def test_pull_updates_checkout_and_master(self):
        """Pulling into a checkout updates the checkout and the master branch."""
        master_tree = self.make_from_branch_and_tree("master")
        master_tree.commit("master")
        checkout = master_tree.branch.create_checkout("checkout")
        try:
            other = self.sprout_to(
                master_tree.branch.controldir, "other"
            ).open_workingtree()
        except errors.NoRoundtrippingSupport:
            raise TestNotApplicable(
                "lossless push between {!r} and {!r} not supported".format(
                    self.branch_format_from, self.branch_format_to
                )
            )
        rev2 = other.commit("other commit")
        # now pull, which should update both checkout and master.
        try:
            checkout.branch.pull(other.branch)
        except errors.NoRoundtrippingSupport:
            raise TestNotApplicable(
                "lossless push between {!r} and {!r} not supported".format(
                    self.branch_format_from, self.branch_format_to
                )
            )
        self.assertEqual(rev2, checkout.branch.last_revision())
        self.assertEqual(rev2, master_tree.branch.last_revision())

    def test_pull_raises_specific_error_on_master_connection_error(self):
        master_tree = self.make_from_branch_and_tree("master")
        checkout = master_tree.branch.create_checkout("checkout")
        other = self.sprout_to(master_tree.branch.controldir, "other").open_branch()
        # move the branch out of the way on disk to cause a connection
        # error.
        try:
            master_tree.branch.controldir.destroy_branch()
        except errors.UnsupportedOperation:
            raise TestNotApplicable(
                "control format does not support destroying default branch"
            )
        # try to pull, which should raise a BoundBranchConnectionFailure.
        self.assertRaises(
            errors.BoundBranchConnectionFailure, checkout.branch.pull, other
        )

    def test_pull_returns_result(self):
        parent = self.make_from_branch_and_tree("parent")
        p1 = parent.commit("1st post")
        try:
            mine = self.sprout_to(parent.controldir, "mine").open_workingtree()
        except errors.NoRoundtrippingSupport:
            raise TestNotApplicable(
                "lossless push between {!r} and {!r} not supported".format(
                    self.branch_format_from, self.branch_format_to
                )
            )
        m1 = mine.commit("my change")
        try:
            result = parent.branch.pull(mine.branch)
        except errors.NoRoundtrippingSupport:
            raise TestNotApplicable(
                "lossless push between {!r} and {!r} not supported".format(
                    self.branch_format_from, self.branch_format_to
                )
            )
        self.assertIsNot(None, result)
        self.assertIs(mine.branch, result.source_branch)
        self.assertIs(parent.branch, result.target_branch)
        self.assertIs(parent.branch, result.master_branch)
        self.assertIs(None, result.local_branch)
        self.assertEqual(1, result.old_revno)
        self.assertEqual(p1, result.old_revid)
        self.assertEqual(2, result.new_revno)
        self.assertEqual(m1, result.new_revid)
        self.assertEqual([], list(result.tag_conflicts))

    def test_pull_overwrite(self):
        tree_a = self.make_from_branch_and_tree("tree_a")
        tree_a.commit("message 1")
        try:
            tree_b = self.sprout_to(tree_a.controldir, "tree_b").open_workingtree()
        except errors.NoRoundtrippingSupport:
            raise TestNotApplicable(
                "lossless push between {!r} and {!r} not supported".format(
                    self.branch_format_from, self.branch_format_to
                )
            )

        rev2a = tree_a.commit("message 2a")
        rev2b = tree_b.commit("message 2b")
        try:
            self.assertRaises(errors.DivergedBranches, tree_a.pull, tree_b.branch)
        except errors.NoRoundtrippingSupport:
            raise TestNotApplicable(
                "lossless push between {!r} and {!r} not supported".format(
                    self.branch_format_from, self.branch_format_to
                )
            )
        self.assertRaises(
            errors.DivergedBranches,
            tree_a.branch.pull,
            tree_b.branch,
            overwrite=False,
            stop_revision=rev2b,
        )
        # It should not have updated the branch tip, but it should have fetched
        # the revision if the repository supports "invisible" revisions.
        self.assertEqual(rev2a, tree_a.branch.last_revision())
        if tree_a.branch.repository._format.supports_unreferenced_revisions:
            self.assertTrue(tree_a.branch.repository.has_revision(rev2b))
        tree_a.branch.pull(tree_b.branch, overwrite=True, stop_revision=rev2b)
        self.assertEqual(rev2b, tree_a.branch.last_revision())
        self.assertEqual(tree_b.branch.last_revision(), tree_a.branch.last_revision())

    def test_pull_tag_selector(self):
        if not self.branch_format_from.supports_tags():
            raise TestNotApplicable("from format does not support tags")
        if not self.branch_format_to.supports_tags():
            raise TestNotApplicable("to format does not support tags")
        tree_a = self.make_from_branch_and_tree("tree_a")
        revid1 = tree_a.commit("message 1")
        try:
            tree_b = self.sprout_to(tree_a.controldir, "tree_b").open_workingtree()
        except errors.NoRoundtrippingSupport:
            raise TestNotApplicable(
                "lossless push between {!r} and {!r} not supported".format(
                    self.branch_format_from, self.branch_format_to
                )
            )
        tree_b.branch.tags.set_tag("tag1", revid1)
        tree_b.branch.tags.set_tag("tag2", revid1)
        tree_b.branch.get_config_stack().set("branch.fetch_tags", True)
        tree_a.pull(tree_b.branch, tag_selector=lambda x: x == "tag1")
        self.assertEqual({"tag1": revid1}, tree_a.branch.tags.get_tag_dict())


class TestPullHook(TestCaseWithInterBranch):
    def setUp(self):
        self.hook_calls = []
        super().setUp()

    def capture_post_pull_hook(self, result):
        """Capture post pull hook calls to self.hook_calls.

        The call is logged, as is some state of the two branches.
        """
        if result.local_branch:
            local_locked = result.local_branch.is_locked()
            local_base = result.local_branch.base
        else:
            local_locked = None
            local_base = None
        self.hook_calls.append(
            (
                "post_pull",
                result.source_branch,
                local_base,
                result.master_branch.base,
                result.old_revno,
                result.old_revid,
                result.new_revno,
                result.new_revid,
                result.source_branch.is_locked(),
                local_locked,
                result.master_branch.is_locked(),
            )
        )

    def test_post_pull_empty_history(self):
        target = self.make_to_branch("target")
        source = self.make_from_branch("source")
        Branch.hooks.install_named_hook("post_pull", self.capture_post_pull_hook, None)
        target.pull(source)
        # with nothing there we should still get a notification, and
        # have both branches locked at the notification time.
        self.assertEqual(
            [
                (
                    "post_pull",
                    source,
                    None,
                    target.base,
                    0,
                    NULL_REVISION,
                    0,
                    NULL_REVISION,
                    True,
                    None,
                    True,
                )
            ],
            self.hook_calls,
        )

    def test_post_pull_bound_branch(self):
        # pulling to a bound branch should pass in the master branch to the
        # hook, allowing the correct number of emails to be sent, while still
        # allowing hooks that want to modify the target to do so to both
        # instances.
        target = self.make_to_branch("target")
        local = self.make_from_branch("local")
        try:
            local.bind(target)
        except BindingUnsupported:
            # We can't bind this format to itself- typically it is the local
            # branch that doesn't support binding.  As of May 2007
            # remotebranches can't be bound.  Let's instead make a new local
            # branch of the default type, which does allow binding.
            # See https://bugs.launchpad.net/bzr/+bug/112020
            local = ControlDir.create_branch_convenience("local2")
            local.bind(target)
        source = self.make_from_branch("source")
        Branch.hooks.install_named_hook("post_pull", self.capture_post_pull_hook, None)
        local.pull(source)
        # with nothing there we should still get a notification, and
        # have both branches locked at the notification time.
        self.assertEqual(
            [
                (
                    "post_pull",
                    source,
                    local.base,
                    target.base,
                    0,
                    NULL_REVISION,
                    0,
                    NULL_REVISION,
                    True,
                    True,
                    True,
                )
            ],
            self.hook_calls,
        )

    def test_post_pull_nonempty_history(self):
        target = self.make_to_branch_and_memory_tree("target")
        target.lock_write()
        target.add("")
        rev1 = target.commit("rev 1")
        target.unlock()
        sourcedir = target.controldir.clone(self.get_url("source"))
        source = sourcedir.open_branch().create_memorytree()
        rev2 = source.commit("rev 2")
        Branch.hooks.install_named_hook("post_pull", self.capture_post_pull_hook, None)
        target.branch.pull(source.branch)
        # with nothing there we should still get a notification, and
        # have both branches locked at the notification time.
        self.assertEqual(
            [
                (
                    "post_pull",
                    source.branch,
                    None,
                    target.branch.base,
                    1,
                    rev1,
                    2,
                    rev2,
                    True,
                    None,
                    True,
                )
            ],
            self.hook_calls,
        )
