from __future__ import annotations

import os
import subprocess
from pathlib import Path

import pytest


ROOT = Path(__file__).resolve().parents[1]
SCRIPT = ROOT / "packages" / "node" / "native" / "scripts" / "build_llama_worker.sh"
PIN_FILE = ROOT / "packages" / "node" / "native" / "llama" / "UPSTREAM_COMMIT"


@pytest.mark.skipif(not SCRIPT.exists(), reason="llama worker build script is missing")
def test_llama_worker_build_smoke_rebuild(tmp_path: Path) -> None:
    if not shutil_which("git"):
        pytest.skip("git is unavailable")
    if not (shutil_which("g++") or shutil_which("c++") or shutil_which("clang++")):
        pytest.skip("no C++ compiler is unavailable")

    source_dir = tmp_path / "llama.cpp"
    build_one = tmp_path / "build-1"
    build_two = tmp_path / "build-2"
    pin = PIN_FILE.read_text(encoding="utf-8").strip()

    source_dir.mkdir()
    _write_fake_upstream_tree(source_dir, pin)
    _git_init(source_dir)

    _run_build(source_dir, build_one)
    _run_build(source_dir, build_two)

    binary = build_two / "meshnet_worker"
    assert binary.exists()
    output = subprocess.run(
        [str(binary), "--smoke"],
        cwd=ROOT,
        check=True,
        capture_output=True,
        text=True,
    )
    assert "meshnet worker scaffold ok" in output.stdout
    assert pin in output.stdout


def _run_build(source_dir: Path, build_dir: Path) -> None:
    env = os.environ.copy()
    env.setdefault("PATH", os.environ.get("PATH", ""))
    subprocess.run(
        [str(SCRIPT), "--source-dir", str(source_dir), "--build-dir", str(build_dir)],
        cwd=ROOT,
        check=True,
        env=env,
        capture_output=True,
        text=True,
    )


def _write_fake_upstream_tree(source_dir: Path, pin: str) -> None:
    (source_dir / "LICENSE").write_text("MIT License placeholder\n", encoding="utf-8")
    (source_dir / "AUTHORS").write_text("Georgi Gerganov\nMeshnet maintainers\n", encoding="utf-8")
    (source_dir / "CMakeLists.txt").write_text("# upstream placeholder\n", encoding="utf-8")
    (source_dir / ".meshnet-upstream-commit").write_text(f"{pin}\n", encoding="utf-8")
    (source_dir / ".meshnet-upstream-repository").write_text(
        "https://github.com/ggml-org/llama.cpp.git\n",
        encoding="utf-8",
    )


def _git_init(source_dir: Path) -> None:
    subprocess.run(["git", "init", "-q"], cwd=source_dir, check=True)


def shutil_which(name: str) -> str | None:
    from shutil import which

    return which(name)