import json
import subprocess
from unittest.mock import patch

from rein_openweights.loop import LoopResult
from rein_openweights.runner import run_task


def _init_repo(tmp_path):
    subprocess.run(["git", "init", "-q"], cwd=tmp_path, check=True)
    subprocess.run(["git", "config", "user.email", "t@example.com"], cwd=tmp_path, check=True)
    subprocess.run(["git", "config", "user.name", "t"], cwd=tmp_path, check=True)
    subprocess.run(["git", "commit", "-q", "--allow-empty", "-m", "init"], cwd=tmp_path, check=True)
    return tmp_path


def _task_file(tmp_path, repo):
    task = tmp_path / "task.json"
    task.write_text(
        json.dumps({"title": "t", "description": "d", "target_repo": str(repo)})
    )
    return str(task)


def test_run_task_ok_when_loop_produces_a_commit(tmp_path):
    repo = _init_repo(tmp_path)
    task_file = _task_file(tmp_path, repo)

    def fake_run_loop(client, repo_root, title, description, *, max_turns, budget):
        subprocess.run(["git", "-C", str(repo_root), "commit", "-q", "--allow-empty", "-m", "task"])
        budget.consume(500)
        return LoopResult(turns=2, finished=True)

    with (
        patch("rein_openweights.runner.resolve_openrouter_api_key", return_value="sk-test"),
        patch("rein_openweights.runner.run_loop", side_effect=fake_run_loop),
        patch("rein_openweights.runner.hub.post_progress_event", return_value=True),
        patch("rein_openweights.runner.hub.post_token_event", return_value=True),
    ):
        result = run_task(task_file)

    assert result.ok is True
    assert result.committed is True
    assert result.tokens_spent == 500


def test_run_task_fails_when_no_commit_produced(tmp_path):
    repo = _init_repo(tmp_path)
    task_file = _task_file(tmp_path, repo)

    with (
        patch("rein_openweights.runner.resolve_openrouter_api_key", return_value="sk-test"),
        patch(
            "rein_openweights.runner.run_loop",
            return_value=LoopResult(turns=1, finished=True),
        ),
        patch("rein_openweights.runner.hub.post_progress_event", return_value=True),
        patch("rein_openweights.runner.hub.post_token_event", return_value=True),
    ):
        result = run_task(task_file)

    assert result.ok is False
    assert result.committed is False
    assert result.reason == "no commit produced"


def test_run_task_fails_fast_without_credential(tmp_path):
    repo = _init_repo(tmp_path)
    task_file = _task_file(tmp_path, repo)

    with patch("rein_openweights.runner.resolve_openrouter_api_key", return_value=None):
        result = run_task(task_file, report_to_hub=False)

    assert result.ok is False
    assert "credential" in result.reason