from datetime import timedelta
from pathlib import Path

import pytest
from sqlalchemy import select

from app.access.service import AccessService
from app.db.models import ChangeOp, PipelineStatus, Push, User, utcnow
from app.db.session import SessionMaker
from app.repo.drafts import Change, DraftView
from app.repo.git import UploadsRepo
from app.repo.publisher import PUSHES_PER_HOUR, Publisher, PushStatus
from tests.conftest import ADMIN, git


@pytest.fixture
async def member(access: AccessService) -> User:
    user = await access.get_member(ADMIN)
    assert user is not None
    return user


def remote_log(remote: Path, tmp_path: Path, name: str = "check") -> tuple[Path, str]:
    clone = tmp_path / name
    git(tmp_path, "clone", "-q", str(remote), str(clone))
    return clone, git(clone, "log", "-1", "--format=%an <%ae>%n%B")


def foreign_commit(remote: Path, tmp_path: Path, path: str, text: str, name: str) -> None:
    other = tmp_path / name
    git(tmp_path, "clone", "-q", str(remote), str(other))
    target = other / path
    target.parent.mkdir(parents=True, exist_ok=True)
    target.write_text(text, encoding="utf-8")
    git(other, "add", "-A")
    git(other, "commit", "-q", "-m", f"foreign {path}")
    git(other, "push", "-q", "origin", "main")


async def draft_on(repo: UploadsRepo, *changes: Change) -> DraftView:
    await repo.refresh(force=True)
    return DraftView(base_sha=await repo.head(), message=None, changes=list(changes))


async def test_push_applies_changes_with_trailer(
    repo: UploadsRepo, sessions: SessionMaker, member: User, remote: Path, tmp_path: Path
) -> None:
    draft = await draft_on(
        repo,
        Change("services/hello/utils.py", ChangeOp.ADD, b"X = 1\n"),
        Change("services/hello/main.py", ChangeOp.MODIFY, b"print('v2')\n"),
        Change("docs/logo.bin", ChangeOp.DELETE, None),
        Change("docs/мои заметки.md", ChangeOp.DELETE, None),
    )
    publisher = Publisher(repo, sessions)

    result = await publisher.push(member, draft, "feat: v2\n\nподробности")

    assert result.status is PushStatus.OK and result.sha is not None
    clone, log = remote_log(remote, tmp_path)
    assert log.startswith("tgit-bot <tgit-bot@users.noreply.tgit>\nfeat: v2\n\nподробности\n\nTelegram-User: ")
    assert f"({ADMIN})" in log
    assert (clone / "services/hello/utils.py").read_text() == "X = 1\n"
    assert (clone / "services/hello/main.py").read_text() == "print('v2')\n"
    assert not (clone / "docs").exists()  # both files gone → the folder is gone too
    assert git(clone, "rev-parse", "HEAD").strip() == result.sha


async def test_nothing_to_commit(repo: UploadsRepo, sessions: SessionMaker, member: User) -> None:
    draft = await draft_on(repo, Change("README.md", ChangeOp.MODIFY, b"# uploads\n"))

    assert (await Publisher(repo, sessions).push(member, draft, "noop")).status is PushStatus.EMPTY


async def test_conflict_then_overwrite(
    repo: UploadsRepo, sessions: SessionMaker, member: User, remote: Path, tmp_path: Path
) -> None:
    draft = await draft_on(repo, Change("README.md", ChangeOp.MODIFY, b"mine\n"))
    foreign_commit(remote, tmp_path, "README.md", "theirs\n", "other")
    publisher = Publisher(repo, sessions)

    conflict = await publisher.push(member, draft, "edit readme")
    assert conflict.status is PushStatus.CONFLICT and conflict.conflicts == ["README.md"]

    forced = await publisher.push(member, draft, "edit readme", overwrite=True)
    assert forced.status is PushStatus.OK
    clone, _ = remote_log(remote, tmp_path)
    assert (clone / "README.md").read_text() == "mine\n"


async def test_unrelated_change_in_main_is_not_a_conflict(
    repo: UploadsRepo, sessions: SessionMaker, member: User, remote: Path, tmp_path: Path
) -> None:
    draft = await draft_on(repo, Change("a.txt", ChangeOp.ADD, b"a"))
    foreign_commit(remote, tmp_path, "b.txt", "b", "other")

    assert (await Publisher(repo, sessions).push(member, draft, "add a")).status is PushStatus.OK
    clone, _ = remote_log(remote, tmp_path)
    assert (clone / "a.txt").exists() and (clone / "b.txt").exists()


async def test_rejected_push_is_rebased(
    repo: UploadsRepo, sessions: SessionMaker, member: User, remote: Path, tmp_path: Path
) -> None:
    raced = False

    async def someone_pushes_first() -> None:
        nonlocal raced
        if not raced:
            raced = True
            foreign_commit(remote, tmp_path, "race.txt", "r", "racer")

    draft = await draft_on(repo, Change("mine.txt", ChangeOp.ADD, b"m"))
    result = await Publisher(repo, sessions, before_push=someone_pushes_first).push(member, draft, "add mine")

    assert result.status is PushStatus.OK and raced
    clone, log = remote_log(remote, tmp_path)
    assert "add mine" in log and (clone / "race.txt").exists() and (clone / "mine.txt").exists()


async def test_path_escape_is_refused(repo: UploadsRepo, sessions: SessionMaker, member: User, tmp_path: Path) -> None:
    draft = await draft_on(repo, Change("../evil.txt", ChangeOp.ADD, b"x"))

    assert (await Publisher(repo, sessions).push(member, draft, "evil")).status is PushStatus.FAILED
    assert not (tmp_path / "evil.txt").exists()


async def test_rate_limit_and_record(repo: UploadsRepo, sessions: SessionMaker, member: User) -> None:
    publisher = Publisher(repo, sessions)
    draft = await draft_on(repo, Change("x.txt", ChangeOp.ADD, b"x"))
    result = await publisher.push(member, draft, "x")
    status = (PipelineStatus.PENDING, PipelineStatus.SKIPPED)
    await publisher.record(member, result, "x", draft, chat_id=ADMIN, message_id=77, status=status)

    async with sessions() as s:
        push = await s.scalar(select(Push))
        assert push is not None and push.sha == result.sha and push.paths == ["x.txt"] and push.message_id == 77
        assert (push.ci_status, push.cd_status) == status
        for i in range(PUSHES_PER_HOUR):
            s.add(
                Push(user_id=ADMIN, sha=f"{i:040d}", message="m", chat_id=1, created_at=utcnow() - timedelta(minutes=1))
            )
        await s.commit()

    assert (await publisher.push(member, draft, "y")).status is PushStatus.LIMIT