# Copyright 2010-2020 The pygit2 contributors
#
# This file is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License, version 2,
# as published by the Free Software Foundation.
#
# In addition to the permissions in the GNU General Public License,
# the authors give you unlimited permission to link the compiled
# version of this file into combinations with other programs,
# and to distribute those combinations without any restriction
# coming from the use of this file.  (The General Public License
# restrictions do apply in other respects; for example, they cover
# modification of the file, and distribution when not linked into
# a combined executable.)
#
# This file 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; see the file COPYING.  If not, write to
# the Free Software Foundation, 51 Franklin Street, Fifth Floor,
# Boston, MA 02110-1301, USA.

"""Tests for Repository objects."""

# Standard Library
import shutil
import tempfile
import os
from os.path import join, realpath
from pathlib import Path
from urllib.request import pathname2url

import pytest

# pygit2
import pygit2
from pygit2 import init_repository, clone_repository, discover_repository
from pygit2 import Oid
from . import utils


def test_is_empty(testrepo):
    assert not testrepo.is_empty

def test_is_bare(testrepo):
    assert not testrepo.is_bare

def test_get_path(testrepo_path):
    testrepo, path = testrepo_path
    expected = realpath(join(path, '.git'))
    assert realpath(testrepo.path) == expected

def test_get_workdir(testrepo_path):
    testrepo, path = testrepo_path
    expected = realpath(path)
    assert realpath(testrepo.workdir) == expected

def test_set_workdir(testrepo):
    directory = tempfile.mkdtemp()
    testrepo.workdir = directory
    assert realpath(testrepo.workdir) == realpath(directory)

def test_checkout_ref(testrepo):
    ref_i18n = testrepo.lookup_reference('refs/heads/i18n')

    # checkout i18n with conflicts and default strategy should
    # not be possible
    with pytest.raises(pygit2.GitError): testrepo.checkout(ref_i18n)

    # checkout i18n with GIT_CHECKOUT_FORCE
    head = testrepo.head
    head = testrepo[head.target]
    assert 'new' not in head.tree
    testrepo.checkout(ref_i18n, strategy=pygit2.GIT_CHECKOUT_FORCE)

    head = testrepo.head
    head = testrepo[head.target]
    assert head.hex == ref_i18n.target.hex
    assert 'new' in head.tree
    assert 'bye.txt' not in testrepo.status()

def test_checkout_branch(testrepo):
    branch_i18n = testrepo.lookup_branch('i18n')

    # checkout i18n with conflicts and default strategy should
    # not be possible
    with pytest.raises(pygit2.GitError): testrepo.checkout(branch_i18n)

    # checkout i18n with GIT_CHECKOUT_FORCE
    head = testrepo.head
    head = testrepo[head.target]
    assert 'new' not in head.tree
    testrepo.checkout(branch_i18n, strategy=pygit2.GIT_CHECKOUT_FORCE)

    head = testrepo.head
    head = testrepo[head.target]
    assert head.hex == branch_i18n.target.hex
    assert 'new' in head.tree
    assert 'bye.txt' not in testrepo.status()

def test_checkout_index(testrepo):
    # some changes to working dir
    with open(os.path.join(testrepo.workdir, 'hello.txt'), 'w') as f:
        f.write('new content')

    # checkout index
    assert 'hello.txt' in testrepo.status()
    testrepo.checkout(strategy=pygit2.GIT_CHECKOUT_FORCE)
    assert 'hello.txt' not in testrepo.status()

def test_checkout_head(testrepo):
    # some changes to the index
    with open(os.path.join(testrepo.workdir, 'bye.txt'), 'w') as f:
        f.write('new content')
    testrepo.index.add('bye.txt')

    # checkout from index should not change anything
    assert 'bye.txt' in testrepo.status()
    testrepo.checkout(strategy=pygit2.GIT_CHECKOUT_FORCE)
    assert 'bye.txt' in testrepo.status()

    # checkout from head will reset index as well
    testrepo.checkout('HEAD', strategy=pygit2.GIT_CHECKOUT_FORCE)
    assert 'bye.txt' not in testrepo.status()

def test_checkout_alternative_dir(testrepo):
    ref_i18n = testrepo.lookup_reference('refs/heads/i18n')
    extra_dir = os.path.join(testrepo.workdir, 'extra-dir')
    os.mkdir(extra_dir)
    assert len(os.listdir(extra_dir)) == 0
    testrepo.checkout(ref_i18n, directory=extra_dir)
    assert not len(os.listdir(extra_dir)) == 0

def test_checkout_paths(testrepo):
    ref_i18n = testrepo.lookup_reference('refs/heads/i18n')
    ref_master = testrepo.lookup_reference('refs/heads/master')
    testrepo.checkout(ref_master)
    testrepo.checkout(ref_i18n, paths=['new'])
    status = testrepo.status()
    assert status['new'] == pygit2.GIT_STATUS_INDEX_NEW

def test_merge_base(testrepo):
    commit = testrepo.merge_base(
        '5ebeeebb320790caf276b9fc8b24546d63316533',
        '4ec4389a8068641da2d6578db0419484972284c8')
    assert commit.hex == 'acecd5ea2924a4b900e7e149496e1f4b57976e51'

    # Create a commit without any merge base to any other
    sig = pygit2.Signature("me", "me@example.com")
    indep = testrepo.create_commit(None, sig, sig, "a new root commit",
                                    testrepo[commit].peel(pygit2.Tree).id, [])

    assert testrepo.merge_base(indep, commit) is None

def test_descendent_of(testrepo):
    assert not testrepo.descendant_of(
        '5ebeeebb320790caf276b9fc8b24546d63316533',
        '4ec4389a8068641da2d6578db0419484972284c8')
    assert not testrepo.descendant_of(
        '5ebeeebb320790caf276b9fc8b24546d63316533',
        '5ebeeebb320790caf276b9fc8b24546d63316533')
    assert testrepo.descendant_of(
        '5ebeeebb320790caf276b9fc8b24546d63316533',
        'acecd5ea2924a4b900e7e149496e1f4b57976e51')
    assert not testrepo.descendant_of(
        'acecd5ea2924a4b900e7e149496e1f4b57976e51',
        '5ebeeebb320790caf276b9fc8b24546d63316533')

    with pytest.raises(pygit2.GitError):
        testrepo.descendant_of(
            '2' * 40,  # a valid but inexistent SHA
            '5ebeeebb320790caf276b9fc8b24546d63316533')

def test_ahead_behind(testrepo):
    ahead, behind = testrepo.ahead_behind(
        '5ebeeebb320790caf276b9fc8b24546d63316533',
        '4ec4389a8068641da2d6578db0419484972284c8')
    assert 1 == ahead
    assert 2 == behind

    ahead, behind = testrepo.ahead_behind(
        '4ec4389a8068641da2d6578db0419484972284c8',
        '5ebeeebb320790caf276b9fc8b24546d63316533')
    assert 2 == ahead
    assert 1 == behind

def test_reset_hard(testrepo):
    ref = "5ebeeebb320790caf276b9fc8b24546d63316533"
    with open(os.path.join(testrepo.workdir, "hello.txt")) as f:
        lines = f.readlines()
    assert "hola mundo\n" in lines
    assert "bonjour le monde\n" in lines

    testrepo.reset(
        ref,
        pygit2.GIT_RESET_HARD)
    assert testrepo.head.target.hex == ref

    with open(os.path.join(testrepo.workdir, "hello.txt")) as f:
        lines = f.readlines()
    #Hard reset will reset the working copy too
    assert "hola mundo\n" not in lines
    assert "bonjour le monde\n" not in lines

def test_reset_soft(testrepo):
    ref = "5ebeeebb320790caf276b9fc8b24546d63316533"
    with open(os.path.join(testrepo.workdir, "hello.txt")) as f:
        lines = f.readlines()
    assert "hola mundo\n" in lines
    assert "bonjour le monde\n" in lines

    testrepo.reset(
        ref,
        pygit2.GIT_RESET_SOFT)
    assert testrepo.head.target.hex == ref
    with open(os.path.join(testrepo.workdir, "hello.txt")) as f:
        lines = f.readlines()
    #Soft reset will not reset the working copy
    assert "hola mundo\n" in lines
    assert "bonjour le monde\n" in lines

    #soft reset will keep changes in the index
    diff = testrepo.diff(cached=True)
    with pytest.raises(KeyError): diff[0]

def test_reset_mixed(testrepo):
    ref = "5ebeeebb320790caf276b9fc8b24546d63316533"
    with open(os.path.join(testrepo.workdir, "hello.txt")) as f:
        lines = f.readlines()
    assert "hola mundo\n" in lines
    assert "bonjour le monde\n" in lines

    testrepo.reset(
        ref,
        pygit2.GIT_RESET_MIXED)

    assert testrepo.head.target.hex == ref

    with open(os.path.join(testrepo.workdir, "hello.txt")) as f:
        lines = f.readlines()
    #mixed reset will not reset the working copy
    assert "hola mundo\n" in lines
    assert "bonjour le monde\n" in lines

    #mixed reset will set the index to match working copy
    diff = testrepo.diff(cached=True)
    assert "hola mundo\n" in diff.patch
    assert "bonjour le monde\n" in diff.patch

def test_stash(testrepo):
    # some changes to working dir
    with open(os.path.join(testrepo.workdir, 'hello.txt'), 'w') as f:
        f.write('new content')

    sig = pygit2.Signature('Stasher', 'stasher@example.com')
    testrepo.stash(sig, include_untracked=True)
    assert 'hello.txt' not in testrepo.status()
    testrepo.stash_apply()
    assert 'hello.txt' in testrepo.status()
    testrepo.stash_drop()
    with pytest.raises(KeyError): testrepo.stash_pop()

def test_revert(testrepo):
    master = testrepo.head.peel()
    commit_to_revert = testrepo['4ec4389a8068641da2d6578db0419484972284c8']
    parent = commit_to_revert.parents[0]
    commit_diff_stats = (
        parent.tree.diff_to_tree(commit_to_revert.tree).stats
    )

    revert_index = testrepo.revert_commit(commit_to_revert, master)
    revert_diff_stats = revert_index.diff_to_tree(master.tree).stats

    assert revert_diff_stats.insertions == commit_diff_stats.deletions
    assert revert_diff_stats.deletions == commit_diff_stats.insertions
    assert revert_diff_stats.files_changed == commit_diff_stats.files_changed

def test_diff_patch(testrepo):
    new_content = ['bye world', 'adiós', 'au revoir monde']
    new_content = ''.join(x + os.linesep for x in new_content)

    # create the patch
    with open(os.path.join(testrepo.workdir, 'hello.txt'), 'wb') as f:
        f.write(new_content.encode('utf-8'))

    patch = testrepo.diff().patch

    # rollback all changes
    testrepo.checkout('HEAD', strategy=pygit2.GIT_CHECKOUT_FORCE)

    # Check apply type error
    with pytest.raises(TypeError) as exc:
        testrepo.apply('HEAD')

    # Apply the patch and compare
    diff = pygit2.Diff.parse_diff(patch)
    testrepo.apply(diff)

    with open(os.path.join(testrepo.workdir, 'hello.txt'), 'rb') as f:
        content = f.read().decode('utf-8')

    assert content == new_content

def test_diff_applies(testrepo):
    new_content = ['bye world', 'adiós', 'au revoir monde']
    new_content = ''.join(x + os.linesep for x in new_content)

    # create the patch
    with open(os.path.join(testrepo.workdir, 'hello.txt'), 'wb') as f:
        f.write(new_content.encode('utf-8'))

    patch = testrepo.diff().patch

    # rollback all changes
    testrepo.checkout('HEAD', strategy=pygit2.GIT_CHECKOUT_FORCE)

    # apply the patch and compare
    diff = pygit2.Diff.parse_diff(patch)
    assert testrepo.applies(diff)

    with open(os.path.join(testrepo.workdir, 'hello.txt'), 'rb') as f:
        content = f.read().decode('utf-8')

    assert content != new_content



def test_default_signature(testrepo):
    config = testrepo.config
    config['user.name'] = 'Random J Hacker'
    config['user.email'] ='rjh@example.com'

    sig = testrepo.default_signature
    assert 'Random J Hacker' == sig.name
    assert 'rjh@example.com' == sig.email


def test_new_repo(tmp_path):
    repo = init_repository(tmp_path, False)

    oid = repo.write(pygit2.GIT_OBJ_BLOB, "Test")
    assert type(oid) == Oid

    assert os.path.exists(os.path.join(tmp_path, '.git'))


def test_no_arg(tmp_path):
    repo = init_repository(tmp_path)
    assert not repo.is_bare

@utils.fspath
def test_no_arg_aspath(tmp_path):
    repo = init_repository(Path(tmp_path))
    assert not repo.is_bare

def test_pos_arg_false(tmp_path):
    repo = init_repository(tmp_path, False)
    assert not repo.is_bare

def test_pos_arg_true(tmp_path):
    repo = init_repository(tmp_path, True)
    assert repo.is_bare

def test_keyword_arg_false(tmp_path):
    repo = init_repository(tmp_path, bare=False)
    assert not repo.is_bare

def test_keyword_arg_true(tmp_path):
    repo = init_repository(tmp_path, bare=True)
    assert repo.is_bare


def test_discover_repo(tmp_path):
    repo = init_repository(tmp_path, False)
    subdir = os.path.join(tmp_path, "test1", "test2")
    os.makedirs(subdir)
    assert repo.path == discover_repository(subdir)

@utils.fspath
def test_discover_repo_aspath(tmp_path):
    repo = init_repository(Path(tmp_path), False)
    subdir = Path(tmp_path) / "test1" / "test2"
    os.makedirs(subdir)
    assert repo.path == discover_repository(subdir)

def test_discover_repo_not_found():
    assert discover_repository(tempfile.tempdir) is None


def test_bytes_string():
    repo_path = b'./test/data/testrepo.git/'
    pygit2.Repository(repo_path)

def test_unicode_string():
    # String is unicode because of unicode_literals
    repo_path = './test/data/testrepo.git/'
    pygit2.Repository(repo_path)

@utils.fspath
def test_aspath():
    repo_path = Path('./test/data/testrepo.git/')
    pygit2.Repository(repo_path)


def test_clone_repository(tmp_path):
    repo_path = "./test/data/testrepo.git/"
    repo = clone_repository(repo_path, tmp_path)
    assert not repo.is_empty
    assert not repo.is_bare

@utils.fspath
def test_clone_repository_aspath(tmp_path):
    repo_path = Path("./test/data/testrepo.git/")
    repo = clone_repository(repo_path, Path(tmp_path))
    assert not repo.is_empty
    assert not repo.is_bare

def test_clone_bare_repository(tmp_path):
    repo_path = "./test/data/testrepo.git/"
    repo = clone_repository(repo_path, tmp_path, bare=True)
    assert not repo.is_empty
    assert repo.is_bare

def test_clone_repository_and_remote_callbacks(tmp_path):
    src_repo_relpath = "./test/data/testrepo.git/"
    repo_path = os.path.join(tmp_path, "clone-into")
    url = pathname2url(os.path.realpath(src_repo_relpath))

    if url.startswith('///'):
        url = 'file:' + url
    else:
        url = 'file://' + url

    def create_repository(path, bare):
        return init_repository(path, bare)

    # here we override the name
    def create_remote(repo, name, url):
        return repo.remotes.create("custom_remote", url)

    repo = clone_repository(url, repo_path, repository=create_repository, remote=create_remote)
    assert not repo.is_empty
    assert 'refs/remotes/custom_remote/master' in repo.listall_references()
    assert b'refs/remotes/custom_remote/master' in repo.raw_listall_references()
    assert repo.remotes["custom_remote"] is not None


@utils.requires_network
def test_clone_with_credentials(tmp_path):
    url = 'https://github.com/libgit2/TestGitRepository'
    credentials = pygit2.UserPass("libgit2", "libgit2")
    callbacks = pygit2.RemoteCallbacks(credentials=credentials)
    repo = clone_repository(url, tmp_path, callbacks=callbacks)

    assert not repo.is_empty

@utils.requires_network
def test_clone_bad_credentials(tmp_path):
    class MyCallbacks(pygit2.RemoteCallbacks):
        def credentials(self, url, username, allowed):
            raise RuntimeError('Unexpected error')

    url = "https://github.com/github/github"
    with pytest.raises(RuntimeError) as exc:
        clone_repository(url, tmp_path, callbacks=MyCallbacks())
    assert str(exc.value) == 'Unexpected error'

def test_clone_with_checkout_branch(tmp_path):
    # create a test case which isolates the remote
    test_repo = clone_repository('./test/data/testrepo.git',
                                 os.path.join(tmp_path, 'testrepo-orig.git'),
                                 bare=True)
    test_repo.create_branch('test', test_repo[test_repo.head.target])
    repo = clone_repository(test_repo.path,
                            os.path.join(tmp_path, 'testrepo.git'),
                            checkout_branch='test', bare=True)
    assert repo.lookup_reference('HEAD').target == 'refs/heads/test'

# FIXME The tests below are commented because they are broken:
#
# - test_clone_push_url: Passes, but does nothing useful.
#
# - test_clone_fetch_spec: Segfaults because of a bug in libgit2 0.19,
#   this has been fixed already, so wait for 0.20
#
# - test_clone_push_spec: Passes, but does nothing useful.
#

#def test_clone_push_url():
#    repo_path = "./test/data/testrepo.git/"
#    repo = clone_repository(
#        repo_path, tmp_path, push_url="custom_push_url"
#    )
#    assert not repo.is_empty
#    # FIXME: When pygit2 supports retrieving the pushurl parameter,
#    # enable this test
#    # assert repo.remotes[0].pushurl == "custom_push_url"
#
#def test_clone_fetch_spec():
#    repo_path = "./test/data/testrepo.git/"
#    repo = clone_repository(repo_path, tmp_path,
#                            fetch_spec="refs/heads/test")
#    assert not repo.is_empty
#    # FIXME: When pygit2 retrieve the fetchspec we passed to git clone.
#    # fetchspec seems to be going through, but the Repository class is
#    # not getting it.
#    # assert repo.remotes[0].fetchspec == "refs/heads/test"
#
#def test_clone_push_spec():
#    repo_path = "./test/data/testrepo.git/"
#    repo = clone_repository(repo_path, tmp_path,
#                            push_spec="refs/heads/test")
#    assert not repo.is_empty
#    # FIXME: When pygit2 supports retrieving the pushspec parameter,
#    # enable this test
#    # not sure how to test this either... couldn't find pushspec
#    # assert repo.remotes[0].fetchspec == "refs/heads/test"


def test_worktree(testrepo):
    worktree_name = 'foo'
    worktree_dir = tempfile.mkdtemp()
    # Delete temp path so that it's not present when we attempt to add the
    # worktree later
    os.rmdir(worktree_dir)

    def _check_worktree(worktree):
        # Confirm the name attribute matches the specified name
        assert worktree.name == worktree_name
        # Confirm the path attribute points to the correct path
        assert os.path.realpath(worktree.path) == os.path.realpath(worktree_dir)
        # The "gitdir" in a worktree should be a file with a reference to
        # the actual gitdir. Let's make sure that the path exists and is a
        # file.
        assert os.path.isfile(os.path.join(worktree_dir, '.git'))

    # We should have zero worktrees
    assert testrepo.list_worktrees() == []
    # Add a worktree
    worktree = testrepo.add_worktree(worktree_name, worktree_dir)
    # Check that the worktree was added properly
    _check_worktree(worktree)
    # We should have one worktree now
    assert testrepo.list_worktrees() == [worktree_name]
    # We should also have a branch of the same name
    assert worktree_name in testrepo.listall_branches()
    # Test that lookup_worktree() returns a properly-instantiated
    # pygit2._Worktree object
    _check_worktree(testrepo.lookup_worktree(worktree_name))
    # Remove the worktree dir
    shutil.rmtree(worktree_dir)
    # Prune the worktree. For some reason, libgit2 treats a worktree as
    # valid unless both the worktree directory and data dir under
    # $GIT_DIR/worktrees are gone. This doesn't make much sense since the
    # normal usage involves removing the worktree directory and then
    # pruning. So, for now we have to force the prune. This may be
    # something to take up with libgit2.
    worktree.prune(True)
    assert testrepo.list_worktrees() == []

@utils.fspath
def test_worktree_aspath(testrepo):
    worktree_name = 'foo'
    worktree_dir = Path(tempfile.mkdtemp())
    # Delete temp path so that it's not present when we attempt to add the
    # worktree later
    os.rmdir(worktree_dir)
    testrepo.add_worktree(worktree_name, worktree_dir)
    assert testrepo.list_worktrees() == [worktree_name]

def test_worktree_custom_ref(testrepo):
    worktree_name = 'foo'
    worktree_dir = tempfile.mkdtemp()
    branch_name = 'version1'

    # New branch based on head
    tip = testrepo.revparse_single('HEAD')
    worktree_ref = testrepo.branches.create(branch_name, tip)
    # Delete temp path so that it's not present when we attempt to add the
    # worktree later
    os.rmdir(worktree_dir)

    # Add a worktree for the given ref
    worktree = testrepo.add_worktree(worktree_name, worktree_dir, worktree_ref)
    # We should have one worktree now
    assert testrepo.list_worktrees() == [worktree_name]
    # We should not have a branch of the same name
    assert worktree_name not in testrepo.listall_branches()

    # The given ref is checked out in the "worktree repository"
    assert worktree_ref.is_checked_out()

    # Remove the worktree dir and prune the worktree
    shutil.rmtree(worktree_dir)
    worktree.prune(True)
    assert testrepo.list_worktrees() == []

    # The ref is no longer checked out
    assert worktree_ref.is_checked_out() == False

    # The branch still exists
    assert branch_name in testrepo.branches
