"""Check download presets and install locked packages from an isolated local index."""

import hashlib
import json
import os
from pathlib import Path
import shutil
import subprocess
import sys
import zipfile

import pytest

from tests.unit.test_windows_bootstrap import run_bootstrap

ROOT = Path(__file__).resolve().parents[2]
pytestmark = pytest.mark.skipif(
    sys.platform != "win32" or not shutil.which("uv"), reason="Windows and uv required"
)


def powershell(tmp_path, script, **env):
    path = tmp_path / "test.ps1"
    path.write_text(
        "$ErrorActionPreference = 'Stop'\n. $env:DOWNLOAD_SCRIPT\n" + script, encoding="ascii"
    )
    clean_env = {
        key: value
        for key, value in os.environ.items()
        if not key.upper().startswith(("UV_", "NPM_CONFIG_"))
    }
    return subprocess.run(
        ["powershell.exe", "-NoProfile", "-ExecutionPolicy", "Bypass", "-File", str(path)],
        env={
            **clean_env,
            "DOWNLOAD_SCRIPT": str(ROOT / "scripts/download_config.ps1"),
            "TEST_ROOT": str(tmp_path),
            **env,
        },
        capture_output=True,
        text=True,
        timeout=45,
    )


def test_presets_overrides_and_process_environment(tmp_path):
    (tmp_path / "config").mkdir()
    config = json.loads((ROOT / "config/downloads.json").read_text())
    config["mode"] = "China"
    config["overrides"]["node_mirror"] = "https://intranet.example/node"
    (tmp_path / "config/downloads.json").write_text(json.dumps(config))
    result = powershell(
        tmp_path,
        """
Initialize-ArtemisDownloads -ProjectRoot $env:TEST_ROOT
if ($ArtemisDownloads.mode -ne 'China') { throw 'Preset not selected' }
if ($ArtemisDownloads.node_mirror -ne 'https://intranet.example/node') { throw 'Override ignored' }
if ($ArtemisDownloads.python_index -ne 'https://intranet.example/simple') { throw 'Environment ignored' }
if ($env:npm_config_registry -ne 'https://registry.npmmirror.com') { throw 'npm mirror missing' }
if ($env:UV_HTTP_TIMEOUT -ne '180') { throw 'Timeout missing' }
Remove-Item Env:npm_config_registry
Remove-Item Env:UV_PYTHON_INSTALL_MIRROR
Initialize-ArtemisDownloads -ProjectRoot $env:TEST_ROOT -Mode Official
if ($ArtemisDownloads.mode -ne 'Official') { throw 'CLI mode ignored' }
if ($env:npm_config_registry) { throw 'Official mode selected a China registry' }
""",
        UV_DEFAULT_INDEX="https://intranet.example/simple",
    )
    assert result.returncode == 0, result.stdout + result.stderr


@pytest.mark.parametrize("corrupt", [False, True])
def test_uv_mirror_bootstrap_verifies_wheel_without_python(tmp_path, corrupt):
    with zipfile.ZipFile(tmp_path / "fixture.zip", "w") as wheel:
        wheel.writestr("uv-1.2.3.data/scripts/uv.exe", b"standalone fixture")
    digest = hashlib.sha256((tmp_path / "fixture.zip").read_bytes()).hexdigest()
    if corrupt:
        digest = "0" * 64
    (tmp_path / "index.html").write_text(
        f'<a href="../../packages/uv-1.2.3-py3-none-win_amd64.whl#sha256={digest}">uv</a>'
    )
    result = powershell(
        tmp_path,
        """
function Invoke-DownloadFile {
    param($Uri, $OutFile)
    if ($Uri -eq 'https://mirror.example/simple/uv/') {
        Copy-Item -LiteralPath (Join-Path $env:TEST_ROOT 'index.html') -Destination $OutFile
    } elseif ($Uri -eq 'https://mirror.example/packages/uv-1.2.3-py3-none-win_amd64.whl') {
        Copy-Item -LiteralPath (Join-Path $env:TEST_ROOT 'fixture.zip') -Destination $OutFile
    } else { throw "Unexpected URL: $Uri" }
    return $true
}
Install-ArtemisUvFromIndex -IndexUrl 'https://mirror.example/simple' -InstallDir (Join-Path $env:TEST_ROOT 'bin')
""",
        PROCESSOR_ARCHITECTURE="AMD64",
        PROCESSOR_ARCHITEW6432="AMD64",
    )
    if corrupt:
        assert result.returncode != 0
        assert "SHA256 verification" in result.stderr
        assert not (tmp_path / "bin/uv.exe").exists()
    else:
        assert result.returncode == 0, result.stdout + result.stderr
        assert (tmp_path / "bin/uv.exe").read_bytes() == b"standalone fixture"


def test_mirror_installs_locked_version_and_reuses_it_without_changing_lock(tmp_path):
    project = tmp_path / "project"
    project.mkdir()
    package_dir = tmp_path / "simple/mirror-fixture"
    package_dir.mkdir(parents=True)
    wheel = package_dir / "mirror_fixture-1.0.0-py3-none-any.whl"
    with zipfile.ZipFile(wheel, "w") as archive:
        archive.writestr("mirror_fixture.py", 'VERSION = "1.0.0"\n')
        archive.writestr(
            "mirror_fixture-1.0.0.dist-info/METADATA",
            "Metadata-Version: 2.1\nName: mirror-fixture\nVersion: 1.0.0\n",
        )
        archive.writestr(
            "mirror_fixture-1.0.0.dist-info/WHEEL",
            "Wheel-Version: 1.0\nRoot-Is-Purelib: true\nTag: py3-none-any\n",
        )
        archive.writestr("mirror_fixture-1.0.0.dist-info/RECORD", "")
    digest = hashlib.sha256(wheel.read_bytes()).hexdigest()
    (package_dir / "index.html").write_text(
        f'<a href="{wheel.name}#sha256={digest}">{wheel.name}</a>'
    )
    (project / "pyproject.toml").write_text(
        '[project]\nname="bootstrap-fixture"\nversion="0.1.0"\n'
        'requires-python=">=3.12"\ndependencies=["mirror-fixture==1.0.0"]\n'
    )
    for module in ("artemis", "uvicorn", "fastapi", "langchain_openai"):
        (project / f"{module}.py").write_text("")
    lock = f"""version = 1
revision = 3
requires-python = ">=3.12"
[[package]]
name = "bootstrap-fixture"
version = "0.1.0"
source = {{ virtual = "." }}
dependencies = [{{ name = "mirror-fixture" }}]
[package.metadata]
requires-dist = [{{ name = "mirror-fixture", specifier = "==1.0.0" }}]
[[package]]
name = "mirror-fixture"
version = "1.0.0"
source = {{ registry = "https://pypi.org/simple" }}
wheels = [{{ url = "https://unreachable.invalid/{wheel.name}", hash = "sha256:{digest}", size = {wheel.stat().st_size} }}]
"""
    (project / "uv.lock").write_text(lock)
    index = (tmp_path / "simple").as_uri()
    first = run_bootstrap(project, mirror_index=index)
    assert first.returncode == 0, first.stdout + first.stderr
    assert (project / ".venv/Lib/site-packages/mirror_fixture.py").exists()
    assert (project / "uv.lock").read_text() == lock
    second = run_bootstrap(project, mirror_index=index)
    assert second.returncode == 0, second.stdout + second.stderr
    assert "dependencies are already ready" in second.stdout
    assert (project / "uv.lock").read_text() == lock