import asyncio
import pathlib
from collections import namedtuple
from typing import Any, NamedTuple
from pathlib import Path

import pytest
from pytest_mock import MockFixture

from redbot.pytest.downloader import *

from redbot.core._downloader.repo_manager import Installable
from redbot.core._downloader.repo_manager import Candidate, ProcessFormatter, RepoManager, Repo
from redbot.core._downloader.errors import (
    AmbiguousRevision,
    ExistingGitRepo,
    GitException,
    UnknownRevision,
)


class FakeCompletedProcess(NamedTuple):
    returncode: int
    stdout: bytes = b""
    stderr: bytes = b""


def _mock_run(
    mocker: MockFixture, repo: Repo, returncode: int, stdout: bytes = b"", stderr: bytes = b""
):
    return mocker.patch.object(
        repo, "_run", autospec=True, return_value=FakeCompletedProcess(returncode, stdout, stderr)
    )


def _mock_setup_repo(mocker: MockFixture, repo: Repo, commit: str):
    def update_commit(*args, **kwargs):
        repo.commit = commit
        return mocker.DEFAULT

    return mocker.patch.object(
        repo, "_setup_repo", autospec=True, side_effect=update_commit, return_value=None
    )


def test_existing_git_repo(tmp_path):
    repo_folder = tmp_path / "repos" / "squid" / ".git"
    repo_folder.mkdir(parents=True, exist_ok=True)

    r = Repo(
        url="https://github.com/tekulvw/Squid-Plugins",
        name="squid",
        branch="rewrite_cogs",
        commit="6acb5decbb717932e5dc0cda7fca0eff452c47dd",
        folder_path=repo_folder.parent,
    )

    exists, git_path = r._existing_git_repo()

    assert exists is True
    assert git_path == repo_folder


ancestor_rev = "c950fc05a540dd76b944719c2a3302da2e2f3090"
descendant_rev = "fb99eb7d2d5bed514efc98fe6686b368f8425745"


@pytest.mark.parametrize(
    "maybe_ancestor_rev,descendant_rev,returncode,expected",
    [(ancestor_rev, descendant_rev, 0, True), (descendant_rev, ancestor_rev, 1, False)],
)
async def test_is_ancestor(mocker, repo, maybe_ancestor_rev, descendant_rev, returncode, expected):
    m = _mock_run(mocker, repo, returncode)
    ret = await repo.is_ancestor(maybe_ancestor_rev, descendant_rev)
    m.assert_called_once_with(
        ProcessFormatter().format(
            repo.GIT_IS_ANCESTOR,
            path=repo.folder_path,
            maybe_ancestor_rev=maybe_ancestor_rev,
            descendant_rev=descendant_rev,
        ),
        valid_exit_codes=(0, 1),
        debug_only=True,
    )
    assert ret is expected


async def test_is_ancestor_object_raise(mocker, repo):
    m = _mock_run(mocker, repo, 128, b"", b"fatal: Not a valid object name invalid1")
    with pytest.raises(UnknownRevision):
        await repo.is_ancestor("invalid1", "invalid2")

    m.assert_called_once_with(
        ProcessFormatter().format(
            repo.GIT_IS_ANCESTOR,
            path=repo.folder_path,
            maybe_ancestor_rev="invalid1",
            descendant_rev="invalid2",
        ),
        valid_exit_codes=(0, 1),
        debug_only=True,
    )


async def test_is_ancestor_commit_raise(mocker, repo):
    m = _mock_run(
        mocker,
        repo,
        128,
        b"",
        b"fatal: Not a valid commit name 0123456789abcde0123456789abcde0123456789",
    )
    with pytest.raises(UnknownRevision):
        await repo.is_ancestor(
            "0123456789abcde0123456789abcde0123456789", "c950fc05a540dd76b944719c2a3302da2e2f3090"
        )

    m.assert_called_once_with(
        ProcessFormatter().format(
            repo.GIT_IS_ANCESTOR,
            path=repo.folder_path,
            maybe_ancestor_rev="0123456789abcde0123456789abcde0123456789",
            descendant_rev="c950fc05a540dd76b944719c2a3302da2e2f3090",
        ),
        valid_exit_codes=(0, 1),
        debug_only=True,
    )


async def test_get_file_update_statuses(mocker, repo):
    old_rev = "c950fc05a540dd76b944719c2a3302da2e2f3090"
    new_rev = "fb99eb7d2d5bed514efc98fe6686b368f8425745"
    m = _mock_run(
        mocker,
        repo,
        0,
        b"A\x00added_file.txt\x00\t"
        b"M\x00mycog/__init__.py\x00\t"
        b"D\x00sample_file1.txt\x00\t"
        b"D\x00sample_file2.txt\x00\t"
        b"A\x00sample_file3.txt",
    )
    ret = await repo._get_file_update_statuses(old_rev, new_rev)
    m.assert_called_once_with(
        ProcessFormatter().format(
            repo.GIT_DIFF_FILE_STATUS, path=repo.folder_path, old_rev=old_rev, new_rev=new_rev
        )
    )

    assert ret == {
        "added_file.txt": "A",
        "mycog/__init__.py": "M",
        "sample_file1.txt": "D",
        "sample_file2.txt": "D",
        "sample_file3.txt": "A",
    }


async def test_is_module_modified(mocker, repo):
    old_rev = "c950fc05a540dd76b944719c2a3302da2e2f3090"
    new_rev = "fb99eb7d2d5bed514efc98fe6686b368f8425745"
    FakeInstallable = namedtuple("Installable", "name commit")
    module = FakeInstallable("mycog", new_rev)
    m = mocker.patch.object(
        repo,
        "_get_file_update_statuses",
        autospec=True,
        return_value={
            "added_file.txt": "A",
            "mycog/__init__.py": "M",
            "sample_file1.txt": "D",
            "sample_file2.txt": "D",
            "sample_file3.txt": "A",
        },
    )
    ret = await repo._is_module_modified(module, old_rev)
    m.assert_called_once_with(old_rev, new_rev)

    assert ret is True


async def test_get_full_sha1_success(mocker, repo):
    commit = "c950fc05a540dd76b944719c2a3302da2e2f3090"
    m = _mock_run(mocker, repo, 0, commit.encode())
    ret = await repo.get_full_sha1(commit)
    m.assert_called_once_with(
        ProcessFormatter().format(repo.GIT_GET_FULL_SHA1, path=repo.folder_path, rev=commit)
    )

    assert ret == commit


async def test_get_full_sha1_notfound(mocker, repo):
    m = _mock_run(mocker, repo, 128, b"", b"fatal: Needed a single revision")
    with pytest.raises(UnknownRevision):
        await repo.get_full_sha1("invalid")
    m.assert_called_once_with(
        ProcessFormatter().format(repo.GIT_GET_FULL_SHA1, path=repo.folder_path, rev="invalid")
    )


async def test_get_full_sha1_ambiguous(mocker, repo):
    m = _mock_run(
        mocker,
        repo,
        128,
        b"",
        b"error: short SHA1 c6f0 is ambiguous\n"
        b"hint: The candidates are:\n"
        b"hint:   c6f028f tag ambiguous_tag_66387\n"
        b"hint:   c6f0e5e commit 2019-10-24 - Commit ambiguous with tag.\n"
        b"fatal: Needed a single revision",
    )
    with pytest.raises(AmbiguousRevision) as exc_info:
        await repo.get_full_sha1("c6f0")
    m.assert_called_once_with(
        ProcessFormatter().format(repo.GIT_GET_FULL_SHA1, path=repo.folder_path, rev="c6f0")
    )

    assert exc_info.value.candidates == [
        Candidate("c6f028f", "tag", "ambiguous_tag_66387"),
        Candidate("c6f0e5e", "commit", "2019-10-24 - Commit ambiguous with tag."),
    ]


def test_update_available_modules(repo):
    module = repo.folder_path / "mycog" / "__init__.py"
    submodule = module.parent / "submodule" / "__init__.py"
    module.parent.mkdir(parents=True)
    module.touch()
    submodule.parent.mkdir()
    submodule.touch()
    ret = repo._update_available_modules()
    assert (
        ret
        == repo.available_modules
        == (Installable(location=module.parent, repo=repo, commit=repo.commit),)
    )


async def test_checkout(mocker, repo):
    commit = "c950fc05a540dd76b944719c2a3302da2e2f3090"
    m = _mock_run(mocker, repo, 0)
    _mock_setup_repo(mocker, repo, commit)
    git_path = repo.folder_path / ".git"
    git_path.mkdir()
    await repo._checkout(commit)

    assert repo.commit == commit
    m.assert_called_once_with(
        ProcessFormatter().format(repo.GIT_CHECKOUT, path=repo.folder_path, rev=commit)
    )


async def test_checkout_ctx_manager(mocker, repo):
    commit = "c950fc05a540dd76b944719c2a3302da2e2f3090"
    m = mocker.patch.object(repo, "_checkout", autospec=True, return_value=None)
    old_commit = repo.commit
    async with repo.checkout(commit):
        m.assert_called_with(commit, force_checkout=False)
        m.return_value = None

    m.assert_called_with(old_commit, force_checkout=False)


async def test_checkout_await(mocker, repo):
    commit = "c950fc05a540dd76b944719c2a3302da2e2f3090"
    m = mocker.patch.object(repo, "_checkout", autospec=True, return_value=None)
    await repo.checkout(commit)

    m.assert_called_once_with(commit, force_checkout=False)


async def test_clone_with_branch(mocker, repo):
    branch = repo.branch = "dont_add_commits"
    commit = "a0ccc2390883c85a361f5a90c72e1b07958939fa"
    repo.commit = ""
    m = _mock_run(mocker, repo, 0)
    _mock_setup_repo(mocker, repo, commit)

    await repo.clone()

    assert repo.commit == commit
    m.assert_called_once_with(
        ProcessFormatter().format(
            repo.GIT_CLONE, branch=branch, url=repo.url, folder=repo.folder_path
        )
    )


async def test_clone_without_branch(mocker, repo):
    branch = "dont_add_commits"
    commit = "a0ccc2390883c85a361f5a90c72e1b07958939fa"
    repo.branch = None
    repo.commit = ""
    m = _mock_run(mocker, repo, 0)
    _mock_setup_repo(mocker, repo, commit)
    mocker.patch.object(repo, "current_branch", autospec=True, return_value=branch)

    await repo.clone()

    assert repo.commit == commit
    m.assert_called_once_with(
        ProcessFormatter().format(repo.GIT_CLONE_NO_BRANCH, url=repo.url, folder=repo.folder_path)
    )


async def test_update(mocker, repo):
    old_commit = repo.commit
    new_commit = "a0ccc2390883c85a361f5a90c72e1b07958939fa"
    m = _mock_run(mocker, repo, 0)
    _mock_setup_repo(mocker, repo, new_commit)
    mocker.patch.object(repo, "latest_commit", autospec=True, return_value=old_commit)
    mocker.patch.object(repo, "hard_reset", autospec=True, return_value=None)
    ret = await repo.update()

    assert ret == (old_commit, new_commit)
    m.assert_called_once_with(ProcessFormatter().format(repo.GIT_PULL, path=repo.folder_path))


# old tests


async def test_add_repo(monkeypatch, repo_manager):
    monkeypatch.setattr("redbot.core._downloader.repo_manager.Repo._run", fake_run_noprint)
    monkeypatch.setattr(
        "redbot.core._downloader.repo_manager.Repo.current_commit", fake_current_commit
    )

    squid = await repo_manager.add_repo(
        url="https://github.com/tekulvw/Squid-Plugins", name="squid", branch="rewrite_cogs"
    )

    assert squid.available_modules == ()


async def test_lib_install_requirements(monkeypatch, library_installable, repo, tmpdir):
    monkeypatch.setattr("redbot.core._downloader.repo_manager.Repo._run", fake_run_noprint)
    monkeypatch.setattr(
        "redbot.core._downloader.repo_manager.Repo.available_libraries", (library_installable,)
    )

    lib_path = Path(str(tmpdir)) / "cog_data_path" / "lib"
    sharedlib_path = lib_path / "cog_shared"
    sharedlib_path.mkdir(parents=True, exist_ok=True)

    installed, failed = await repo.install_libraries(
        target_dir=sharedlib_path, req_target_dir=lib_path
    )

    assert len(installed) == 1
    assert len(failed) == 0


async def test_remove_repo(monkeypatch, repo_manager):
    monkeypatch.setattr("redbot.core._downloader.repo_manager.Repo._run", fake_run_noprint)
    monkeypatch.setattr(
        "redbot.core._downloader.repo_manager.Repo.current_commit", fake_current_commit
    )

    await repo_manager.add_repo(
        url="https://github.com/tekulvw/Squid-Plugins", name="squid", branch="rewrite_cogs"
    )
    assert repo_manager.get_repo("squid") is not None
    await repo_manager.delete_repo("squid")
    assert repo_manager.get_repo("squid") is None


async def test_existing_repo(mocker, repo_manager):
    repo_manager.does_repo_exist = mocker.MagicMock(return_value=True)

    with pytest.raises(ExistingGitRepo):
        await repo_manager.add_repo("http://test.com", "test")

    repo_manager.does_repo_exist.assert_called_once_with("test")


def test_tree_url_parse(repo_manager):
    cases = [
        {
            "input": ("https://github.com/Tobotimus/Tobo-Cogs", None),
            "expected": ("https://github.com/Tobotimus/Tobo-Cogs", None),
        },
        {
            "input": ("https://github.com/Tobotimus/Tobo-Cogs", "V3"),
            "expected": ("https://github.com/Tobotimus/Tobo-Cogs", "V3"),
        },
        {
            "input": ("https://github.com/Tobotimus/Tobo-Cogs/tree/V3", None),
            "expected": ("https://github.com/Tobotimus/Tobo-Cogs", "V3"),
        },
        {
            "input": ("https://github.com/Tobotimus/Tobo-Cogs/tree/V3", "V4"),
            "expected": ("https://github.com/Tobotimus/Tobo-Cogs", "V4"),
        },
    ]

    for test_case in cases:
        assert test_case["expected"] == repo_manager._parse_url(*test_case["input"])


def test_tree_url_non_github(repo_manager):
    cases = [
        {
            "input": ("https://gitlab.com/Tobotimus/Tobo-Cogs", None),
            "expected": ("https://gitlab.com/Tobotimus/Tobo-Cogs", None),
        },
        {
            "input": ("https://my.usgs.gov/bitbucket/scm/Tobotimus/Tobo-Cogs", "V3"),
            "expected": ("https://my.usgs.gov/bitbucket/scm/Tobotimus/Tobo-Cogs", "V3"),
        },
    ]

    for test_case in cases:
        assert test_case["expected"] == repo_manager._parse_url(*test_case["input"])
