import os
import subprocess
import sys
from pathlib import Path

import pytest

REPO_ROOT = Path(__file__).resolve().parents[1]
PY_ENV = os.environ.copy()
PY_ENV["PYTHONPATH"] = (
    f"{REPO_ROOT}:{PY_ENV['PYTHONPATH']}"
    if PY_ENV.get("PYTHONPATH")
    else str(REPO_ROOT)
)


def run(cmd: list[str], cwd: Path) -> subprocess.CompletedProcess[str]:
    return subprocess.run(cmd, cwd=cwd, check=True, text=True, capture_output=True)


@pytest.fixture()
def git_repo(tmp_path: Path) -> Path:
    repo = tmp_path / "repo"
    repo.mkdir()
    run(["git", "init"], cwd=repo)
    run(["git", "config", "user.email", "dev@example.com"], cwd=repo)
    run(["git", "config", "user.name", "Dev"], cwd=repo)

    content = """---
type: feature-discussion
status: OPEN
feature_id: FR_1
---

## Summary
Initial summary

## Participation
- Maintainer: Kickoff. VOTE: READY
"""
    (repo / "Docs/features/FR_1/discussions").mkdir(parents=True, exist_ok=True)
    discussion = repo / "Docs/features/FR_1/discussions/example.discussion.md"
    discussion.write_text(content, encoding="utf-8")
    run(["git", "add", discussion.as_posix()], cwd=repo)
    run(["git", "commit", "-m", "init"], cwd=repo)

    return repo


def test_header_change_allowed(git_repo: Path) -> None:
    discussion = git_repo / "Docs/features/FR_1/discussions/example.discussion.md"
    lines = discussion.read_text(encoding="utf-8").splitlines()
    lines[2] = "status: READY_FOR_DESIGN"
    discussion.write_text("\n".join(lines) + "\n", encoding="utf-8")
    run(["git", "add", discussion.as_posix()], cwd=git_repo)

    proc = subprocess.run(
        [sys.executable, "-m", "automation.append_only", discussion.as_posix()],
        cwd=git_repo,
        text=True,
        env=PY_ENV,
    )
    assert proc.returncode == 0


def test_body_edit_blocked(git_repo: Path) -> None:
    discussion = git_repo / "Docs/features/FR_1/discussions/example.discussion.md"
    text = discussion.read_text(encoding="utf-8")
    discussion.write_text(
        text.replace("Initial summary", "Updated summary"), encoding="utf-8"
    )
    run(["git", "add", discussion.as_posix()], cwd=git_repo)

    proc = subprocess.run(
        [sys.executable, "-m", "automation.append_only", discussion.as_posix()],
        cwd=git_repo,
        capture_output=True,
        text=True,
        env=PY_ENV,
    )
    assert proc.returncode == 1
    assert "append-only" in proc.stderr