# coding: utf-8
# test_diff.py
# Copyright (C) 2008, 2009 Michael Trier (mtrier@gmail.com) and contributors
#
# This module is part of GitPython and is released under
# the BSD License: http://www.opensource.org/licenses/bsd-license.php
import ddt
import shutil
import tempfile
import unittest
from git import (
    Repo,
    GitCommandError,
    Diff,
    DiffIndex,
    NULL_TREE,
    Submodule,
)
from git.cmd import Git
from test.lib import (
    TestBase,
    StringProcessAdapter,
    fixture,
)
from test.lib import with_rw_directory

import os.path as osp


def to_raw(input):
    return input.replace(b'\t', b'\x00')


@ddt.ddt
class TestDiff(TestBase):

    def setUp(self):
        self.repo_dir = tempfile.mkdtemp()
        self.submodule_dir = tempfile.mkdtemp()

    def tearDown(self):
        import gc
        gc.collect()
        shutil.rmtree(self.repo_dir)
        shutil.rmtree(self.submodule_dir)

    def _assert_diff_format(self, diffs):
        # verify that the format of the diff is sane
        for diff in diffs:
            if diff.a_mode:
                assert isinstance(diff.a_mode, int)
            if diff.b_mode:
                assert isinstance(diff.b_mode, int)

            if diff.a_blob:
                assert not diff.a_blob.path.endswith('\n')
            if diff.b_blob:
                assert not diff.b_blob.path.endswith('\n')
        # END for each diff
        return diffs

    @with_rw_directory
    def test_diff_with_staged_file(self, rw_dir):
        # SETUP INDEX WITH MULTIPLE STAGES
        r = Repo.init(rw_dir)
        fp = osp.join(rw_dir, 'hello.txt')
        with open(fp, 'w') as fs:
            fs.write("hello world")
        r.git.add(Git.polish_url(fp))
        r.git.commit(message="init")

        with open(fp, 'w') as fs:
            fs.write("Hola Mundo")
        r.git.add(Git.polish_url(fp))
        self.assertEqual(len(r.index.diff("HEAD", create_patch=True)), 1,
                         "create_patch should generate patch of diff to HEAD")
        r.git.commit(message="change on master")
        self.assertEqual(len(r.index.diff("HEAD", create_patch=True)), 0,
                         "create_patch should generate no patch, already on HEAD")

        r.git.checkout('HEAD~1', b='topic')
        with open(fp, 'w') as fs:
            fs.write("Hallo Welt")
        r.git.commit(all=True, message="change on topic branch")

        # there must be a merge-conflict
        with self.assertRaises(GitCommandError):
            r.git.cherry_pick('master')

        # Now do the actual testing - this should just work
        self.assertEqual(len(r.index.diff(None)), 2)

        self.assertEqual(len(r.index.diff(None, create_patch=True)), 0,
                         "This should work, but doesn't right now ... it's OK")

    def test_list_from_string_new_mode(self):
        output = StringProcessAdapter(fixture('diff_new_mode'))
        diffs = Diff._index_from_patch_format(self.rorepo, output)
        self._assert_diff_format(diffs)

        self.assertEqual(1, len(diffs))
        self.assertEqual(8, len(diffs[0].diff.splitlines()))

    def test_diff_with_rename(self):
        output = StringProcessAdapter(fixture('diff_rename'))
        diffs = Diff._index_from_patch_format(self.rorepo, output)
        self._assert_diff_format(diffs)

        self.assertEqual(1, len(diffs))

        diff = diffs[0]
        self.assertTrue(diff.renamed_file)
        self.assertTrue(diff.renamed)
        self.assertEqual(diff.rename_from, 'Jérôme')
        self.assertEqual(diff.rename_to, 'müller')
        self.assertEqual(diff.raw_rename_from, b'J\xc3\xa9r\xc3\xb4me')
        self.assertEqual(diff.raw_rename_to, b'm\xc3\xbcller')
        assert isinstance(str(diff), str)

        output = StringProcessAdapter(to_raw(fixture('diff_rename_raw')))
        diffs = Diff._index_from_raw_format(self.rorepo, output)
        self.assertEqual(len(diffs), 1)
        diff = diffs[0]
        self.assertIsNotNone(diff.renamed_file)
        self.assertIsNotNone(diff.renamed)
        self.assertEqual(diff.rename_from, 'this')
        self.assertEqual(diff.rename_to, 'that')
        self.assertEqual(diff.change_type, 'R')
        self.assertEqual(diff.score, 100)
        self.assertEqual(len(list(diffs.iter_change_type('R'))), 1)

    def test_diff_with_copied_file(self):
        output = StringProcessAdapter(fixture('diff_copied_mode'))
        diffs = Diff._index_from_patch_format(self.rorepo, output)
        self._assert_diff_format(diffs)

        self.assertEqual(1, len(diffs))

        diff = diffs[0]
        self.assertTrue(diff.copied_file)
        self.assertTrue(diff.a_path, 'test1.txt')
        self.assertTrue(diff.b_path, 'test2.txt')
        assert isinstance(str(diff), str)

        output = StringProcessAdapter(to_raw(fixture('diff_copied_mode_raw')))
        diffs = Diff._index_from_raw_format(self.rorepo, output)
        self.assertEqual(len(diffs), 1)
        diff = diffs[0]
        self.assertEqual(diff.change_type, 'C')
        self.assertEqual(diff.score, 100)
        self.assertEqual(diff.a_path, 'test1.txt')
        self.assertEqual(diff.b_path, 'test2.txt')
        self.assertEqual(len(list(diffs.iter_change_type('C'))), 1)

    def test_diff_with_change_in_type(self):
        output = StringProcessAdapter(fixture('diff_change_in_type'))
        diffs = Diff._index_from_patch_format(self.rorepo, output)
        self._assert_diff_format(diffs)
        self.assertEqual(2, len(diffs))

        diff = diffs[0]
        self.assertIsNotNone(diff.deleted_file)
        self.assertEqual(diff.a_path, 'this')
        self.assertEqual(diff.b_path, 'this')
        assert isinstance(str(diff), str)

        diff = diffs[1]
        self.assertEqual(diff.a_path, None)
        self.assertEqual(diff.b_path, 'this')
        self.assertIsNotNone(diff.new_file)
        assert isinstance(str(diff), str)

        output = StringProcessAdapter(to_raw(fixture('diff_change_in_type_raw')))
        diffs = Diff._index_from_raw_format(self.rorepo, output)
        self.assertEqual(len(diffs), 1)
        diff = diffs[0]
        self.assertEqual(diff.rename_from, None)
        self.assertEqual(diff.rename_to, None)
        self.assertEqual(diff.change_type, 'T')
        self.assertEqual(len(list(diffs.iter_change_type('T'))), 1)

    def test_diff_of_modified_files_not_added_to_the_index(self):
        output = StringProcessAdapter(to_raw(fixture('diff_abbrev-40_full-index_M_raw_no-color')))
        diffs = Diff._index_from_raw_format(self.rorepo, output)

        self.assertEqual(len(diffs), 1, 'one modification')
        self.assertEqual(len(list(diffs.iter_change_type('M'))), 1, 'one modification')
        self.assertEqual(diffs[0].change_type, 'M')
        self.assertIsNone(diffs[0].b_blob,)

    @ddt.data(
        (Diff._index_from_patch_format, 'diff_patch_binary'),
        (Diff._index_from_raw_format, 'diff_raw_binary')
    )
    def test_binary_diff(self, case):
        method, file_name = case
        res = method(None, StringProcessAdapter(fixture(file_name)))
        self.assertEqual(len(res), 1)
        self.assertEqual(len(list(res.iter_change_type('M'))), 1)
        if res[0].diff:
            self.assertEqual(res[0].diff,
                             b"Binary files a/rps and b/rps differ\n",
                             "in patch mode, we get a diff text")
            self.assertIsNotNone(str(res[0]), "This call should just work")

    def test_diff_index(self):
        output = StringProcessAdapter(fixture('diff_index_patch'))
        res = Diff._index_from_patch_format(None, output)
        self.assertEqual(len(res), 6)
        for dr in res:
            self.assertTrue(dr.diff.startswith(b'@@'), dr)
            self.assertIsNotNone(str(dr), "Diff to string conversion should be possible")
        # end for each diff

        dr = res[3]
        assert dr.diff.endswith(b"+Binary files a/rps and b/rps differ\n")

    def test_diff_index_raw_format(self):
        output = StringProcessAdapter(fixture('diff_index_raw'))
        res = Diff._index_from_raw_format(None, output)
        self.assertIsNotNone(res[0].deleted_file)
        self.assertIsNone(res[0].b_path,)

    @unittest.skip("This currently fails and would need someone to improve diff parsing")
    def test_diff_file_with_colon(self):
        output = fixture('diff_file_with_colon')
        res = []
        Diff._handle_diff_line(output, None, res)

    def test_diff_initial_commit(self):
        initial_commit = self.rorepo.commit('33ebe7acec14b25c5f84f35a664803fcab2f7781')

        # Without creating a patch...
        diff_index = initial_commit.diff(NULL_TREE)
        self.assertEqual(diff_index[0].b_path, 'CHANGES')
        self.assertIsNotNone(diff_index[0].new_file)
        self.assertEqual(diff_index[0].diff, '')

        # ...and with creating a patch
        diff_index = initial_commit.diff(NULL_TREE, create_patch=True)
        self.assertIsNone(diff_index[0].a_path, repr(diff_index[0].a_path))
        self.assertEqual(diff_index[0].b_path, 'CHANGES', repr(diff_index[0].b_path))
        self.assertIsNotNone(diff_index[0].new_file)
        self.assertEqual(diff_index[0].diff, fixture('diff_initial'))

    def test_diff_unsafe_paths(self):
        output = StringProcessAdapter(fixture('diff_patch_unsafe_paths'))
        res = Diff._index_from_patch_format(None, output)

        # The "Additions"
        self.assertEqual(res[0].b_path, 'path/ starting with a space')
        self.assertEqual(res[1].b_path, 'path/"with-quotes"')
        self.assertEqual(res[2].b_path, "path/'with-single-quotes'")
        self.assertEqual(res[3].b_path, 'path/ending in a space ')
        self.assertEqual(res[4].b_path, 'path/with\ttab')
        self.assertEqual(res[5].b_path, 'path/with\nnewline')
        self.assertEqual(res[6].b_path, 'path/with spaces')
        self.assertEqual(res[7].b_path, 'path/with-question-mark?')
        self.assertEqual(res[8].b_path, 'path/¯\\_(ツ)_|¯')
        self.assertEqual(res[9].b_path, 'path/💩.txt')
        self.assertEqual(res[9].b_rawpath, b'path/\xf0\x9f\x92\xa9.txt')
        self.assertEqual(res[10].b_path, 'path/�-invalid-unicode-path.txt')
        self.assertEqual(res[10].b_rawpath, b'path/\x80-invalid-unicode-path.txt')

        # The "Moves"
        # NOTE: The path prefixes a/ and b/ here are legit!  We're actually
        # verifying that it's not "a/a/" that shows up, see the fixture data.
        self.assertEqual(res[11].a_path, 'a/with spaces')       # NOTE: path a/ here legit!
        self.assertEqual(res[11].b_path, 'b/with some spaces')  # NOTE: path b/ here legit!
        self.assertEqual(res[12].a_path, 'a/ending in a space ')
        self.assertEqual(res[12].b_path, 'b/ending with space ')
        self.assertEqual(res[13].a_path, 'a/"with-quotes"')
        self.assertEqual(res[13].b_path, 'b/"with even more quotes"')

    def test_diff_patch_format(self):
        # test all of the 'old' format diffs for completness - it should at least
        # be able to deal with it
        fixtures = ("diff_2", "diff_2f", "diff_f", "diff_i", "diff_mode_only",
                    "diff_new_mode", "diff_numstat", "diff_p", "diff_rename",
                    "diff_tree_numstat_root", "diff_patch_unsafe_paths")

        for fixture_name in fixtures:
            diff_proc = StringProcessAdapter(fixture(fixture_name))
            Diff._index_from_patch_format(self.rorepo, diff_proc)
        # END for each fixture

    def test_diff_with_spaces(self):
        data = StringProcessAdapter(fixture('diff_file_with_spaces'))
        diff_index = Diff._index_from_patch_format(self.rorepo, data)
        self.assertIsNone(diff_index[0].a_path, repr(diff_index[0].a_path))
        self.assertEqual(diff_index[0].b_path, 'file with spaces', repr(diff_index[0].b_path))

    def test_diff_submodule(self):
        """Test that diff is able to correctly diff commits that cover submodule changes"""
        # Init a temp git repo that will be referenced as a submodule
        sub = Repo.init(self.submodule_dir)
        with open(self.submodule_dir + "/subfile", "w") as sub_subfile:
            sub_subfile.write("")
        sub.index.add(["subfile"])
        sub.index.commit("first commit")

        # Init a temp git repo that will incorporate the submodule
        repo = Repo.init(self.repo_dir)
        with open(self.repo_dir + "/test", "w") as foo_test:
            foo_test.write("")
        repo.index.add(['test'])
        Submodule.add(repo, "subtest", "sub", url="file://" + self.submodule_dir)
        repo.index.commit("first commit")
        repo.create_tag('1')

        # Add a commit to the submodule
        submodule = repo.submodule('subtest')
        with open(self.repo_dir + "/sub/subfile", "w") as foo_sub_subfile:
            foo_sub_subfile.write("blub")
        submodule.module().index.add(["subfile"])
        submodule.module().index.commit("changed subfile")
        submodule.binsha = submodule.module().head.commit.binsha

        # Commit submodule updates in parent repo
        repo.index.add([submodule])
        repo.index.commit("submodule changed")
        repo.create_tag('2')

        diff = repo.commit('1').diff(repo.commit('2'))[0]
        # If diff is unable to find the commit hashes (looks in wrong repo) the *_blob.size
        # property will be a string containing exception text, an int indicates success
        self.assertIsInstance(diff.a_blob.size, int)
        self.assertIsInstance(diff.b_blob.size, int)

    def test_diff_interface(self):
        # test a few variations of the main diff routine
        assertion_map = {}
        for i, commit in enumerate(self.rorepo.iter_commits('0.1.6', max_count=2)):
            diff_item = commit
            if i % 2 == 0:
                diff_item = commit.tree
            # END use tree every second item

            for other in (None, NULL_TREE, commit.Index, commit.parents[0]):
                for paths in (None, "CHANGES", ("CHANGES", "lib")):
                    for create_patch in range(2):
                        diff_index = diff_item.diff(other=other, paths=paths, create_patch=create_patch)
                        assert isinstance(diff_index, DiffIndex)

                        if diff_index:
                            self._assert_diff_format(diff_index)
                            for ct in DiffIndex.change_type:
                                key = 'ct_%s' % ct
                                assertion_map.setdefault(key, 0)
                                assertion_map[key] = assertion_map[key] + len(list(diff_index.iter_change_type(ct)))
                            # END for each changetype

                            # check entries
                            diff_set = set()
                            diff_set.add(diff_index[0])
                            diff_set.add(diff_index[0])
                            self.assertEqual(len(diff_set), 1)
                            self.assertEqual(diff_index[0], diff_index[0])
                            self.assertFalse(diff_index[0] != diff_index[0])

                            for dr in diff_index:
                                self.assertIsNotNone(str(dr), "Diff to string conversion should be possible")
                        # END diff index checking
                    # END for each patch option
                # END for each path option
            # END for each other side
        # END for each commit

        # assert we could always find at least one instance of the members we
        # can iterate in the diff index - if not this indicates its not working correctly
        # or our test does not span the whole range of possibilities
        for key, value in assertion_map.items():
            self.assertIsNotNone(value, "Did not find diff for %s" % key)
        # END for each iteration type

        # test path not existing in the index - should be ignored
        c = self.rorepo.head.commit
        cp = c.parents[0]
        diff_index = c.diff(cp, ["does/not/exist"])
        self.assertEqual(len(diff_index), 0)
