#!/usr/bin/env python
# Copyright 2014 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Unit tests for git_rebase_update.py"""

import os
import sys

DEPOT_TOOLS_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
sys.path.insert(0, DEPOT_TOOLS_ROOT)

from testing_support import coverage_utils
from testing_support import git_test_utils

class GitRebaseUpdateTest(git_test_utils.GitRepoReadWriteTestBase):
  REPO_SCHEMA = """
  A B C D E F G
    B H I J K
          J L
  """

  @classmethod
  def getRepoContent(cls, commit):
    # Every commit X gets a file X with the content X
    return {commit: {'data': commit}}

  @classmethod
  def setUpClass(cls):
    super(GitRebaseUpdateTest, cls).setUpClass()
    import git_rebase_update, git_new_branch, git_reparent_branch, git_common
    import git_rename_branch
    cls.reup = git_rebase_update
    cls.rp = git_reparent_branch
    cls.nb = git_new_branch
    cls.mv = git_rename_branch
    cls.gc = git_common
    cls.gc.TEST_MODE = True

  def setUp(self):
    super(GitRebaseUpdateTest, self).setUp()
    # Include branch_K, branch_L to make sure that ABCDEFG all get the
    # same commit hashes as self.repo. Otherwise they get committed with the
    # wrong timestamps, due to commit ordering.
    # TODO(iannucci): Make commit timestamps deterministic in left to right, top
    #                 to bottom order, not in lexi-topographical order.
    origin_schema = git_test_utils.GitRepoSchema("""
    A B C D E F G M N O
      B H I J K
            J L
    """, self.getRepoContent)
    self.origin = origin_schema.reify()
    self.origin.git('checkout', 'master')
    self.origin.git('branch', '-d', *['branch_'+l for l in 'KLG'])

    self.repo.git('remote', 'add', 'origin', self.origin.repo_path)
    self.repo.git('config', '--add', 'remote.origin.fetch',
                  '+refs/tags/*:refs/tags/*')
    self.repo.git('update-ref', 'refs/remotes/origin/master', 'tag_E')
    self.repo.git('branch', '--set-upstream-to', 'branch_G', 'branch_K')
    self.repo.git('branch', '--set-upstream-to', 'branch_K', 'branch_L')
    self.repo.git('branch', '--set-upstream-to', 'origin/master', 'branch_G')

    self.repo.to_schema_refs += ['origin/master']

  def tearDown(self):
    self.origin.nuke()
    super(GitRebaseUpdateTest, self).tearDown()

  def testRebaseUpdate(self):
    self.repo.git('checkout', 'branch_K')

    self.repo.run(self.nb.main, ['foobar'])
    self.assertEqual(self.repo.git('rev-parse', 'HEAD').stdout,
                     self.repo.git('rev-parse', 'origin/master').stdout)

    with self.repo.open('foobar', 'w') as f:
      f.write('this is the foobar file')
    self.repo.git('add', 'foobar')
    self.repo.git_commit('foobar1')

    with self.repo.open('foobar', 'w') as f:
      f.write('totes the Foobar file')
    self.repo.git_commit('foobar2')

    self.repo.git('checkout', 'branch_K')
    self.repo.run(self.nb.main, ['--upstream-current', 'sub_K'])
    with self.repo.open('K', 'w') as f:
      f.write('This depends on K')
    self.repo.git_commit('sub_K')

    self.repo.run(self.nb.main, ['old_branch'])
    self.repo.git('reset', '--hard', self.repo['A'])
    with self.repo.open('old_file', 'w') as f:
      f.write('old_files we want to keep around')
    self.repo.git('add', 'old_file')
    self.repo.git_commit('old_file')
    self.repo.git('config', 'branch.old_branch.dormant', 'true')

    self.repo.git('checkout', 'origin/master')

    self.assertSchema("""
    A B H I J K sub_K
            J L
      B C D E foobar1 foobar2
            E F G
    A old_file
    """)
    self.assertEquals(self.repo['A'], self.origin['A'])
    self.assertEquals(self.repo['E'], self.origin['E'])

    with self.repo.open('bob', 'wb') as f:
      f.write('testing auto-freeze/thaw')

    output, _ = self.repo.capture_stdio(self.reup.main)
    self.assertIn('Cannot rebase-update', output)

    self.repo.run(self.nb.main, ['empty_branch'])
    self.repo.run(self.nb.main, ['--upstream-current', 'empty_branch2'])

    self.repo.git('checkout', 'branch_K')

    output, _ = self.repo.capture_stdio(self.reup.main)

    self.assertIn('Rebasing: branch_G', output)
    self.assertIn('Rebasing: branch_K', output)
    self.assertIn('Rebasing: branch_L', output)
    self.assertIn('Rebasing: foobar', output)
    self.assertIn('Rebasing: sub_K', output)
    self.assertIn('Deleted branch branch_G', output)
    self.assertIn('Deleted branch empty_branch', output)
    self.assertIn('Deleted branch empty_branch2', output)
    self.assertIn('Reparented branch_K to track origin/master', output)

    self.assertSchema("""
    A B C D E F G M N O H I J K sub_K
                              K L
                      O foobar1 foobar2
    A old_file
    """)

    output, _ = self.repo.capture_stdio(self.reup.main)
    self.assertIn('branch_K up-to-date', output)
    self.assertIn('branch_L up-to-date', output)
    self.assertIn('foobar up-to-date', output)
    self.assertIn('sub_K up-to-date', output)

    with self.repo.open('bob') as f:
      self.assertEquals('testing auto-freeze/thaw', f.read())

    self.assertEqual(self.repo.git('status', '--porcelain').stdout, '?? bob\n')

    self.repo.git('checkout', 'origin/master')
    _, err = self.repo.capture_stdio(self.rp.main, ['foobar'])
    self.assertIn('Must be on the branch', err)

    self.repo.git('checkout', 'branch_K')
    _, err = self.repo.capture_stdio(self.rp.main, ['origin/master'])
    self.assertIn('Cannot reparent a branch to its existing parent', err)
    output, _ = self.repo.capture_stdio(self.rp.main, ['foobar'])
    self.assertIn('Rebasing: branch_K', output)
    self.assertIn('Rebasing: sub_K', output)
    self.assertIn('Rebasing: branch_L', output)

    self.assertSchema("""
    A B C D E F G M N O foobar1 foobar2 H I J K L
                                              K sub_K
    A old_file
    """)

    self.repo.git('checkout', 'sub_K')
    output, _ = self.repo.capture_stdio(self.rp.main, ['foobar'])
    self.assertIn('Squashing failed', output)

    self.assertTrue(self.repo.run(self.gc.in_rebase))

    self.repo.git('rebase', '--abort')
    self.assertIsNone(self.repo.run(self.gc.thaw))

    self.assertSchema("""
    A B C D E F G M N O foobar1 foobar2 H I J K L
    A old_file
                                              K sub_K
    """)

    self.assertEqual(self.repo.git('status', '--porcelain').stdout, '?? bob\n')

    branches = self.repo.run(set, self.gc.branches())
    self.assertEqual(branches, {'branch_K', 'master', 'sub_K', 'root_A',
                                'branch_L', 'old_branch', 'foobar'})

    self.repo.git('checkout', 'branch_K')
    self.repo.run(self.mv.main, ['special_K'])

    branches = self.repo.run(set, self.gc.branches())
    self.assertEqual(branches, {'special_K', 'master', 'sub_K', 'root_A',
                                'branch_L', 'old_branch', 'foobar'})

    self.repo.git('checkout', 'origin/master')
    _, err = self.repo.capture_stdio(self.mv.main, ['special_K', 'cool branch'])
    self.assertIn('fatal: \'cool branch\' is not a valid branch name.', err)

    self.repo.run(self.mv.main, ['special_K', 'cool_branch'])
    branches = self.repo.run(set, self.gc.branches())
    self.assertEqual(branches, {'cool_branch', 'master', 'sub_K', 'root_A',
                                'branch_L', 'old_branch', 'foobar'})

    _, branch_tree = self.repo.run(self.gc.get_branch_tree)
    self.assertEqual(branch_tree['sub_K'], 'foobar')


  def testRebaseConflicts(self):
    # Pretend that branch_L landed
    self.origin.git('checkout', 'master')
    with self.origin.open('L', 'w') as f:
      f.write('L')
    self.origin.git('add', 'L')
    self.origin.git_commit('L')

    # Add a commit to branch_K so that things fail
    self.repo.git('checkout', 'branch_K')
    with self.repo.open('M', 'w') as f:
      f.write('NOPE')
    self.repo.git('add', 'M')
    self.repo.git_commit('K NOPE')

    # Add a commits to branch_L which will work when squashed
    self.repo.git('checkout', 'branch_L')
    self.repo.git('reset', 'branch_L~')
    with self.repo.open('L', 'w') as f:
      f.write('NOPE')
    self.repo.git('add', 'L')
    self.repo.git_commit('L NOPE')
    with self.repo.open('L', 'w') as f:
      f.write('L')
    self.repo.git('add', 'L')
    self.repo.git_commit('L YUP')

    # start on a branch which will be deleted
    self.repo.git('checkout', 'branch_G')

    output, _ = self.repo.capture_stdio(self.reup.main)
    self.assertIn('branch.branch_K.dormant true', output)

    output, _ = self.repo.capture_stdio(self.reup.main)
    self.assertIn('Rebase in progress', output)

    self.repo.git('checkout', '--theirs', 'M')
    self.repo.git('rebase', '--skip')

    output, _ = self.repo.capture_stdio(self.reup.main)
    self.assertIn('Failed! Attempting to squash', output)
    self.assertIn('Deleted branch branch_G', output)
    self.assertIn('Deleted branch branch_L', output)
    self.assertIn('\'branch_G\' was merged', output)
    self.assertIn('checking out \'origin/master\'', output)


  def testTrackTag(self):
    self.origin.git('tag', 'lkgr', self.origin['M'])
    self.repo.git('tag', 'lkgr', self.repo['D'])

    self.repo.git('config', 'branch.branch_G.remote', '.')
    self.repo.git('config', 'branch.branch_G.merge', 'refs/tags/lkgr')

    self.assertIn(
        'fatal: \'foo bar\' is not a valid branch name',
        self.repo.capture_stdio(self.nb.main, ['--lkgr', 'foo bar'])[1])

    self.repo.run(self.nb.main, ['--lkgr', 'foobar'])

    with self.repo.open('foobar', 'w') as f:
      f.write('this is the foobar file')
    self.repo.git('add', 'foobar')
    self.repo.git_commit('foobar1')

    with self.repo.open('foobar', 'w') as f:
      f.write('totes the Foobar file')
    self.repo.git_commit('foobar2')

    self.assertSchema("""
    A B H I J K
            J L
      B C D E F G
          D foobar1 foobar2
    """)
    self.assertEquals(self.repo['A'], self.origin['A'])
    self.assertEquals(self.repo['G'], self.origin['G'])

    output, _ = self.repo.capture_stdio(self.reup.main)
    self.assertIn('Fetching', output)
    self.assertIn('Rebasing: branch_G', output)
    self.assertIn('Rebasing: branch_K', output)
    self.assertIn('Rebasing: branch_L', output)
    self.assertIn('Rebasing: foobar', output)
    self.assertEquals(self.repo.git('rev-parse', 'lkgr').stdout.strip(),
                      self.origin['M'])

    self.assertSchema("""
    A B C D E F G M N O
                  M H I J K L
                  M foobar1 foobar2
    """)

    _, err = self.repo.capture_stdio(self.rp.main, ['tag F'])
    self.assertIn('fatal: invalid reference', err)

    output, _ = self.repo.capture_stdio(self.rp.main, ['tag_F'])
    self.assertIn('to track tag_F [tag] (was lkgr [tag])', output)

    self.assertSchema("""
    A B C D E F G M N O
                  M H I J K L
              F foobar1 foobar2
    """)

    output, _ = self.repo.capture_stdio(self.rp.main, ['--lkgr'])
    self.assertIn('to track lkgr [tag] (was tag_F [tag])', output)

    self.assertSchema("""
    A B C D E F G M N O
                  M H I J K L
                  M foobar1 foobar2
    """)

    output, _ = self.repo.capture_stdio(self.rp.main, ['--root'])
    self.assertIn('to track origin/master (was lkgr [tag])', output)

    self.assertSchema("""
    A B C D E F G M N O foobar1 foobar2
                  M H I J K L
    """)


if __name__ == '__main__':
  sys.exit(coverage_utils.covered_main((
    os.path.join(DEPOT_TOOLS_ROOT, 'git_rebase_update.py'),
    os.path.join(DEPOT_TOOLS_ROOT, 'git_new_branch.py'),
    os.path.join(DEPOT_TOOLS_ROOT, 'git_reparent_branch.py'),
    os.path.join(DEPOT_TOOLS_ROOT, 'git_rename_branch.py')
  )))