from __future__ import annotations

import json
import subprocess
from datetime import date
from pathlib import Path

from rein_aharness import fi_research_brief


def _git(cwd: Path, *args: str) -> None:
    subprocess.run(["git", "-C", str(cwd), *args], check=True, capture_output=True)


def _repo(tmp_path: Path) -> Path:
    repo = tmp_path / "freedom-intelligence"
    repo.mkdir()
    subprocess.run(["git", "init", "-q", "-b", "main"], cwd=repo, check=True)
    (repo / "README.md").write_text("baseline\n", encoding="utf-8")
    subprocess.run(["git", "add", "."], cwd=repo, check=True)
    subprocess.run(
        [
            "git",
            "-c",
            "user.email=test@example.invalid",
            "-c",
            "user.name=test",
            "commit",
            "-qm",
            "baseline",
        ],
        cwd=repo,
        check=True,
    )
    return repo


def _with_origin(tmp_path: Path, repo: Path) -> Path:
    remote = tmp_path / "origin.git"
    subprocess.run(["git", "init", "--bare", "-q", "-b", "main", str(remote)], check=True)
    _git(repo, "remote", "add", "origin", str(remote))
    _git(repo, "push", "-u", "origin", "HEAD:main")
    return remote


def _complete(_prompt: str) -> str:
    return json.dumps(
        {
            "headline_deltas": ["No material delta after allowlist review."],
            "axis_a": [],
            "axis_b": [],
            "axis_c": [],
            "axis_d": [],
            "collection_candidates": [],
            "lab_implications": ["Recheck tomorrow."],
        }
    )


def test_fi_brief_pushes_to_origin_and_records_sha(tmp_path: Path) -> None:
    repo = _repo(tmp_path)
    _with_origin(tmp_path, repo)
    result = fi_research_brief.run_fi_research_brief(
        repo,
        day=date(2026, 9, 13),
        report_to_hub=False,
        complete_fn=_complete,
    )
    assert result.ok is True
    assert result.committed is True
    assert result.pushed is True
    assert result.origin_sha
    remote_head = subprocess.run(
        ["git", "-C", str(tmp_path / "origin.git"), "rev-parse", "HEAD"],
        check=True,
        capture_output=True,
        text=True,
    ).stdout.strip()
    assert remote_head == result.origin_sha
    brief = repo / "briefs" / "2026" / "09" / "2026-09-13.md"
    assert brief.is_file()


def test_fi_brief_push_failure_is_not_a_completed_day(
    tmp_path: Path, monkeypatch
) -> None:
    repo = _repo(tmp_path)
    posted: list[dict] = []

    def fake_post(**kwargs):
        posted.append(kwargs)

    monkeypatch.setattr(fi_research_brief.hub, "post_progress_event", fake_post)
    result = fi_research_brief.run_fi_research_brief(
        repo,
        day=date(2026, 9, 13),
        report_to_hub=True,
        complete_fn=_complete,
    )
    assert result.ok is False
    assert result.committed is True
    assert result.pushed is False
    assert "origin publish failed" in result.reason
    assert posted
    assert posted[-1]["event_type"] == "executor_run"
    assert posted[-1]["detail"]["pushed"] is False


def _advance_origin(tmp_path: Path, name: str, rel: str) -> None:
    """Commit to origin from a second clone so the executor's push is non-fast-forward."""
    other = tmp_path / name
    subprocess.run(["git", "clone", "-q", str(tmp_path / "origin.git"), str(other)], check=True)
    (other / rel).parent.mkdir(parents=True, exist_ok=True)
    (other / rel).write_text("moved\n", encoding="utf-8")
    _git(other, "add", rel)
    _git(other, "-c", "user.email=o@example.invalid", "-c", "user.name=o", "commit", "-qm", "move origin")
    _git(other, "push", "-q", "origin", "HEAD:main")


def test_fi_brief_rebases_once_when_origin_moved(tmp_path: Path) -> None:
    repo = _repo(tmp_path)
    _with_origin(tmp_path, repo)
    _advance_origin(tmp_path, "other", "WORK-RECORDS.md")
    result = fi_research_brief.run_fi_research_brief(
        repo, day=date(2026, 9, 22), report_to_hub=False, complete_fn=_complete
    )
    assert result.ok is True
    assert result.pushed is True
    remote_head = subprocess.run(
        ["git", "-C", str(tmp_path / "origin.git"), "rev-parse", "HEAD"],
        check=True, capture_output=True, text=True,
    ).stdout.strip()
    assert remote_head == result.origin_sha
    parents = subprocess.run(
        ["git", "-C", str(repo), "rev-list", "--parents", "-1", "HEAD"],
        check=True, capture_output=True, text=True,
    ).stdout.split()
    assert len(parents) == 2  # linear history: rebased, not merged


def test_fi_brief_refuses_rebase_of_non_brief_commits(tmp_path: Path) -> None:
    repo = _repo(tmp_path)
    _with_origin(tmp_path, repo)
    (repo / "notes.md").write_text("local only\n", encoding="utf-8")
    _git(repo, "add", "notes.md")
    _git(repo, "-c", "user.email=t@example.invalid", "-c", "user.name=t", "commit", "-qm", "stray")
    _advance_origin(tmp_path, "other", "WORK-RECORDS.md")
    result = fi_research_brief.run_fi_research_brief(
        repo, day=date(2026, 9, 22), report_to_hub=False, complete_fn=_complete
    )
    assert result.ok is False
    assert result.pushed is False
    assert "outside briefs/" in result.reason


def test_fi_brief_rebase_conflict_fails_closed(tmp_path: Path) -> None:
    repo = _repo(tmp_path)
    _with_origin(tmp_path, repo)
    _advance_origin(tmp_path, "other", "briefs/2026/09/2026-09-22.md")
    result = fi_research_brief.run_fi_research_brief(
        repo, day=date(2026, 9, 22), report_to_hub=False, complete_fn=_complete
    )
    assert result.ok is False
    assert result.pushed is False
    status = subprocess.run(
        ["git", "-C", str(repo), "status", "--porcelain=v2", "--branch"],
        check=True, capture_output=True, text=True,
    ).stdout
    assert "rebase" not in status.lower()
    assert not (repo / ".git" / "rebase-merge").exists()