# Copyright (C) 2008, 2009, 2011 Canonical Ltd
#
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# it under the terms of the GNU General Public License as published by
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#
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
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"""Tests for upgrades of various stacking situations."""

from .. import (
    controldir,
    check,
    errors,
    tests,
    )
from ..upgrade import upgrade
from .scenarios import load_tests_apply_scenarios


def upgrade_scenarios():
    scenario_pairs = [  # old format, new format, model_change
        #        ('knit', 'rich-root', True),
        ('knit', '1.6', False),
        #        ('pack-0.92', '1.6', False),
        ('1.6', '1.6.1-rich-root', True),
        ]
    scenarios = []
    for (old_name, new_name, model_change) in scenario_pairs:
        name = old_name + ', ' + new_name
        scenarios.append((name,
                          dict(scenario_old_format=old_name,
                               scenario_new_format=new_name,
                               scenario_model_change=model_change)))
    return scenarios


load_tests = load_tests_apply_scenarios


class TestStackUpgrade(tests.TestCaseWithTransport):
    # TODO: This should possibly be repeated for all stacking repositories,
    # pairwise by rich/non-rich format; should possibly also try other kinds
    # of upgrades like knit->pack. -- mbp 20080804

    scenarios = upgrade_scenarios()

    def test_stack_upgrade(self):
        """Correct checks when stacked-on repository is upgraded.

        We initially stack on a repo with the same rich root support,
        we then upgrade it and should fail, we then upgrade the overlaid
        repository.
        """
        base = self.make_branch_and_tree('base',
                                         format=self.scenario_old_format)
        self.build_tree(['base/foo'])
        base.commit('base commit')
        # make another one stacked
        stacked = base.controldir.sprout('stacked', stacked=True)
        # this must really be stacked (or get_stacked_on_url raises an error)
        self.assertTrue(stacked.open_branch().get_stacked_on_url())
        # now we'll upgrade the underlying branch, then upgrade the stacked
        # branch, and this should still work.
        new_format = controldir.format_registry.make_controldir(
            self.scenario_new_format)
        upgrade('base', new_format)
        # in some cases you'll get an error if the underlying model has
        # changed; if just the data format has changed this should still work
        if self.scenario_model_change:
            self.assertRaises(errors.IncompatibleRepositories,
                              stacked.open_branch)
        else:
            check.check_dwim('stacked', False, True, True)
        stacked = controldir.ControlDir.open('stacked')
        # but we can upgrade the stacked repository
        upgrade('stacked', new_format)
        # and now it opens ok
        stacked = controldir.ControlDir.open('stacked')
        # And passes check.
        check.check_dwim('stacked', False, True, True)
