# Copyright (C) 2026 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Tests for the E2E harness helpers themselves."""

import http.client
from pathlib import Path
from typing import Mapping, Tuple
import urllib.parse

import harness
import pytest


def _http_request(
    server: harness.GitHttpServer, method: str, path: str
) -> Tuple[int, bytes]:
    """Send a request to `server` & return the response status & body."""
    url = urllib.parse.urlsplit(server.url)
    conn = http.client.HTTPConnection(url.hostname, url.port, timeout=30)
    try:
        conn.request(method, path)
        resp = conn.getresponse()
        return resp.status, resp.read()
    finally:
        conn.close()


@pytest.mark.parametrize(
    "key,value",
    [
        ("core.bare", "true"),
        ('url.C:\\src\\#1;"x".insteadOf', 'C:\\dst\\ #2;"y"'),
        ("alias.multi", "a\nb"),
    ],
)
def test_write_config(tmp_path: Path, key: str, value: str) -> None:
    """Subsections & values round-trip through git's config parser."""
    path = tmp_path / "config"
    harness.write_config(path, {key: value})
    got = harness.run_git("config", "--file", str(path), "--get", key)
    assert got == value


@pytest.mark.parametrize(
    "files",
    [
        {"foo/bar": "x", "foo": None},
        {"foo": None, "foo/bar": "x"},
    ],
)
def test_commit_replace_file_with_dir(
    tmp_path: Path, files: Mapping[str, harness.FileContent]
) -> None:
    """Deletions apply before additions regardless of dict order."""
    repo = harness.ServerRepo.create(tmp_path / "repo.git", "unused")
    repo.commit({"foo": "file"})
    repo.commit(files)
    assert repo.git("ls-tree", "-r", "--name-only", "main") == "foo/bar"


def test_snapshot_worktree_host_excludes(
    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
    """The developer's global excludes apply despite the isolated HOME."""
    host_home = tmp_path / "host-home"
    host_home.mkdir()
    excludes = host_home / "excludes"
    excludes.write_text("venv/\n")
    # Set excludesFile explicitly so a system-wide one can't take precedence.
    harness.write_config(
        host_home / ".gitconfig", {"core.excludesFile": excludes.as_posix()}
    )
    monkeypatch.setattr(harness, "HOST_ENVIRON", {"HOME": str(host_home)})
    root = tmp_path / "checkout"
    harness.run_git("init", "--quiet", str(root))
    (root / ".gitignore").write_text("*.pyc\n")
    (root / "main.py").write_text("")
    (root / "main.pyc").write_text("")
    (root / "venv").mkdir()
    (root / "venv" / "lib.py").write_text("")
    assert sorted(harness._snapshot_worktree(root)) == [".gitignore", "main.py"]


@pytest.mark.parametrize(
    "chunked,expect_continue",
    [(False, False), (True, False), (True, True)],
)
def test_http_post_body(
    git_server: harness.GitHttpServer, chunked: bool, expect_continue: bool
) -> None:
    """POST bodies reach git http-backend however curl encodes them."""
    name = f"post-{int(chunked)}{int(expect_continue)}.git"
    repo = harness.ServerRepo.create(git_server.root / name, "unused")
    commit = repo.commit({"file": "x"})
    # A protocol v2 ls-refs request: a command pkt-line & a flush-pkt.
    body = b"0014command=ls-refs\n0000"
    headers = {
        "Content-Type": "application/x-git-upload-pack-request",
        "Git-Protocol": "version=2",
    }
    if expect_continue:
        headers["Expect"] = "100-continue"
    url = urllib.parse.urlsplit(git_server.url)
    conn = http.client.HTTPConnection(url.hostname, url.port, timeout=30)
    try:
        # http.client skips any interim `100 Continue` response.
        conn.request(
            "POST",
            f"/{name}/git-upload-pack",
            body=iter([body[:10], body[10:]]) if chunked else body,
            headers=headers,
            encode_chunked=chunked,
        )
        resp = conn.getresponse()
        assert resp.status == 200
        assert f"{commit} refs/heads/main".encode() in resp.read()
    finally:
        conn.close()


def test_static_files(git_server: harness.GitHttpServer) -> None:
    """Published files are served as-is, and nothing outside of them."""
    host = harness.GitHost(git_server, "static-files")
    host.create_repo("repo", {"f": "x"})
    url = host.publish_file("dir/default.xml", "<manifest />\n")
    path = urllib.parse.urlsplit(url).path
    assert _http_request(git_server, "GET", path) == (200, b"<manifest />\n")

    # Publishing again replaces the file.
    assert host.publish_file("dir/default.xml", b"v2") == url
    assert _http_request(git_server, "GET", path) == (200, b"v2")

    static = f"/{host.prefix}/{harness.STATIC_DIR}"
    for bad_path in (
        f"{static}/missing.xml",
        f"{static}/dir",
        f"{static}/../repo.git/config",
        f"{static}/%2e%2e/repo.git/config",
        f"{static}//etc/passwd",
    ):
        assert _http_request(git_server, "GET", bad_path)[0] == 404, bad_path
    assert _http_request(git_server, "POST", path)[0] == 404


def test_offline(git_server: harness.GitHttpServer) -> None:
    """Requests fail while a namespace is offline, and work again after."""
    host = harness.GitHost(git_server, "offline")
    repo = host.create_repo("platform/repo", {"f": "x"})
    other = harness.GitHost(git_server, "online")
    other_repo = other.create_repo("repo", {"f": "x"})

    with host.offline():
        with pytest.raises(AssertionError, match="503"):
            harness.run_git("ls-remote", repo.url)
        # Other namespaces are unaffected.
        assert "refs/heads/main" in harness.run_git("ls-remote", other_repo.url)
    assert {r.status for r in host.requests()} == {503}

    # The outage ends even if the context exits with an exception.
    with pytest.raises(RuntimeError):
        with host.offline():
            raise RuntimeError("boom")
    assert "refs/heads/main" in harness.run_git("ls-remote", repo.url)


def test_requested_repos(git_server: harness.GitHttpServer) -> None:
    """`requested_repos()` & `watch_requests()` track repo requests."""
    host = harness.GitHost(git_server, "requested")
    nested = host.create_repo("platform/nested", {"f": "x"})
    top = host.create_repo("top", {"f": "x"})
    host.publish_file("file.xml", "x")

    harness.run_git("ls-remote", nested.url)
    with host.watch_requests() as watched:
        harness.run_git("ls-remote", top.url)
        _http_request(git_server, "GET", f"/{host.prefix}/top/clone.bundle")
        _http_request(git_server, "GET", f"/{host.prefix}/_static/file.xml")

    assert host.requested_repos() == {"platform/nested", "top"}
    assert host.requested_repos(watched) == {"top"}
    assert host.requests_for("platform/nested", watched) == []


def test_client_config(tmp_path: Path) -> None:
    """`RepoClient.config()` tells unset keys apart from errors."""
    # Don't let git find a repo above tmp_path (e.g. with --basetemp).
    env = dict(harness.clean_environ(), GIT_CEILING_DIRECTORIES=str(tmp_path))
    client = harness.RepoClient(tmp_path / "client", harness.LAUNCHER, env, "")
    repo = client.top / "repo"
    harness.run_git("init", "-q", str(repo))
    harness.run_git("config", "-f", str(repo / ".git/config"), "a.key", "val")
    (client.top / "not-a-repo").mkdir()

    assert client.config("repo", "a.key") == "val"
    assert client.config("repo", "a.unset") is None
    with pytest.raises(AssertionError, match="failed in not-a-repo"):
        client.config("not-a-repo", "a.key")