import hashlib
import importlib.util
from pathlib import Path

import pytest

spec = importlib.util.spec_from_file_location(
    "runtime_builder", Path(__file__).parents[1] / "scripts/build-rein-runtime.py"
)
builder = importlib.util.module_from_spec(spec)
spec.loader.exec_module(builder)


def test_claude_copy_is_pinned_and_excludes_home(tmp_path):
    source = tmp_path / "native"
    source.write_bytes(b"\x7fELFtest artifact, never executed")
    (tmp_path / "credentials.json").write_text("must not enter artifact")
    output = tmp_path / "runtime"
    (output / "bin").mkdir(parents=True)
    digest = hashlib.sha256(source.read_bytes()).hexdigest()
    metadata = builder.install_claude(output, source, digest, "test-version")
    assert metadata["sha256"] == digest
    assert metadata["path"] == "/opt/sandboxer/runtime/bin/claude"
    assert list((output / "bin").iterdir()) == [output / "bin/claude"]
    assert (output / "bin/claude").read_bytes() == source.read_bytes()
    assert (output / "bin/claude").stat().st_mode & 0o777 == 0o755
    assert not (output / "credentials.json").exists()
    with pytest.raises(FileExistsError):
        builder.install_claude(output, source, digest, "test-version")


def test_changed_binary_and_host_wrapper_refuse(tmp_path):
    source = tmp_path / "binary"
    source.write_bytes(b"#!/usr/bin/env node\n")
    output = tmp_path / "runtime"
    (output / "bin").mkdir(parents=True)
    with pytest.raises(ValueError, match="digest mismatch"):
        builder.install_claude(output, source, "0" * 64, "test-version")
    digest = hashlib.sha256(source.read_bytes()).hexdigest()
    with pytest.raises(ValueError, match="native ELF"):
        builder.install_claude(output, source, digest, "test-version")
    link = tmp_path / "link"
    link.symlink_to(source)
    with pytest.raises(ValueError, match="symlink"):
        builder.install_claude(output, link, digest, "test-version")
    assert not (output / "bin/claude").exists()


def test_incomplete_claude_pin_refuses_before_build(tmp_path):
    with pytest.raises(ValueError, match="supplied together"):
        builder.build(tmp_path / "out", tmp_path, tmp_path, claude_binary=tmp_path / "claude")
    assert not (tmp_path / "out").exists()


def test_owner_build_requires_matching_sibling_lock_before_output(tmp_path, monkeypatch):
    import json
    rein = tmp_path / "rein"
    llm = tmp_path / "llm"
    output = tmp_path / "output"
    def checked(argv, **kwargs):
        if "--porcelain" in argv:
            return ""
        if "rev-parse" in argv:
            return "a" * 40
        return json.dumps({"ok": True, "dependencies": [
            {"distribution": "llm-connect", "commit": "b" * 40}
        ]})
    monkeypatch.setattr(builder, "checked", checked)
    with pytest.raises(ValueError, match="does not match"):
        builder.build(output, rein, llm, owner_runtime=True)
    assert not output.exists()


@pytest.mark.parametrize("change", [None, "stale", "missing", "extra"])
def test_installed_package_contents_must_match_committed_source(tmp_path, change):
    import subprocess
    source = tmp_path / "source"
    package = source / "fixture"
    package.mkdir(parents=True)
    (package / "__init__.py").write_text("VERSION = 2\n")
    subprocess.run(["git", "init", "-q", str(source)], check=True)
    subprocess.run(["git", "-C", str(source), "add", "fixture"], check=True)
    site = tmp_path / "site"
    installed = site / "fixture"
    installed.mkdir(parents=True)
    (installed / "__init__.py").write_text("VERSION = 2\n")
    if change == "stale":
        (installed / "__init__.py").write_text("VERSION = 1\n")
    elif change == "missing":
        (installed / "__init__.py").unlink()
    elif change == "extra":
        (installed / "retired.py").write_text("old = True\n")
    if change:
        with pytest.raises(ValueError, match="owner package"):
            builder.verify_source_files(site, [(source, "fixture", "fixture")])
    else:
        result = builder.verify_source_files(site, [(source, "fixture", "fixture")])
        assert result["files_verified"] == 1