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import unittest

from webkitpy.thirdparty.mock import Mock
from webkitpy.tool.mocktool import MockOptions, MockTool
from webkitpy.tool.steps.discardlocalchanges import DiscardLocalChanges
from webkitpy.common.system.executive import ScriptError


class DiscardLocalChangesTest(unittest.TestCase):
    def test_skip_on_clean(self):
        tool = MockTool()
        tool._scm = Mock()
        step = DiscardLocalChanges(tool, MockOptions(clean=False))
        step.run({})
        self.assertEqual(tool._scm.discard_local_changes.call_count, 0)

    def test_working_changes_exist_with_force(self):
        tool = MockTool()
        tool._scm = Mock()
        tool._scm.has_working_directory_changes = lambda: True
        tool._scm.has_local_commits = lambda: False
        step = DiscardLocalChanges(tool, MockOptions(clean=True, force_clean=True))
        step.run({})
        self.assertEqual(tool._scm.discard_local_changes.call_count, 1)

    def test_local_commits_exist_with_force(self):
        tool = MockTool()
        tool._scm = Mock()
        tool._scm.has_working_directory_changes = lambda: False
        tool._scm.has_local_commits = lambda: True
        step = DiscardLocalChanges(tool, MockOptions(clean=True, force_clean=True))
        step.run({})
        self.assertEqual(tool._scm.discard_local_changes.call_count, 1)

    def test_local_commits_and_working_changes_exist_with_force(self):
        tool = MockTool()
        tool._scm = Mock()
        tool._scm.has_working_directory_changes = lambda: True
        tool._scm.has_local_commits = lambda: True
        step = DiscardLocalChanges(tool, MockOptions(clean=True, force_clean=True))
        step.run({})
        self.assertEqual(tool._scm.discard_local_changes.call_count, 1)

    def test_no_changes_exist_with_force(self):
        tool = MockTool()
        tool._scm = Mock()
        tool._scm.has_working_directory_changes = lambda: False
        tool._scm.has_local_commits = lambda: False
        step = DiscardLocalChanges(tool, MockOptions(clean=True, force_clean=True))
        step.run({})
        self.assertEqual(tool._scm.discard_local_changes.call_count, 1)

    def test_error_working_changes_exist_without_force(self):
        tool = MockTool()
        tool._scm = Mock()
        tool._scm.has_working_directory_changes = lambda: True
        tool._scm.has_local_commits = lambda: False
        step = DiscardLocalChanges(tool, MockOptions(clean=True, force_clean=False))
        self.assertRaises(ScriptError, step.run, {})
        self.assertEqual(tool._scm.discard_local_changes.call_count, 0)

    def test_error_local_commits_exist_without_force(self):
        tool = MockTool()
        tool._scm = Mock()
        tool._scm.has_working_directory_changes = lambda: False
        tool._scm.has_local_commits = lambda: True
        step = DiscardLocalChanges(tool, MockOptions(clean=True, force_clean=False))
        self.assertRaises(ScriptError, step.run, {})
        self.assertEqual(tool._scm.discard_local_changes.call_count, 0)
