"""Tests for services/trash.py — mocks async_session (no real DB)."""
from unittest.mock import AsyncMock, MagicMock, patch

import pytest
from tests.helpers import make_mock_session


def _exists_result(found=True):
    r = MagicMock()
    r.first.return_value = (1,) if found else None
    return r


@pytest.mark.asyncio
async def test_delete_note_returns_batch_and_commits():
    session = make_mock_session()
    # exists-check, then the subtree descent: one child-lookup (no children
    # here) + one _set stamping the whole subtree.
    no_children = MagicMock()
    no_children.scalars.return_value.all.return_value = []
    session.execute = AsyncMock(side_effect=[_exists_result(True), no_children, MagicMock()])
    with patch("scribe.services.trash.async_session") as cls:
        cls.return_value = session
        from scribe.services.trash import delete
        batch = await delete(user_id=1, entity_type="note", entity_id=5)
    assert isinstance(batch, str) and len(batch) > 0
    assert session.commit.called
    # exists-check + subtree-descent query + subtree _set
    assert session.execute.await_count == 3


@pytest.mark.asyncio
async def test_delete_returns_none_when_not_found():
    session = make_mock_session()
    session.execute = AsyncMock(return_value=_exists_result(False))
    with patch("scribe.services.trash.async_session") as cls:
        cls.return_value = session
        from scribe.services.trash import delete
        batch = await delete(user_id=1, entity_type="task", entity_id=999)
    assert batch is None
    assert not session.commit.called
    # only the existence check ran
    assert session.execute.await_count == 1


@pytest.mark.asyncio
async def test_delete_project_cascades_to_notes_milestones_project_rules_and_suppressions():
    session = make_mock_session()
    # exists-check + 6 cascade ops:
    #   notes (soft) → milestones (soft) → project-scoped rules (soft) →
    #   project_rule_suppressions (hard DELETE) → project_topic_suppressions (hard DELETE) →
    #   project (soft)
    session.execute = AsyncMock(side_effect=[
        _exists_result(True),
        MagicMock(), MagicMock(), MagicMock(),
        MagicMock(), MagicMock(),
        MagicMock(),
    ])
    with patch("scribe.services.trash.async_session") as cls:
        cls.return_value = session
        from scribe.services.trash import delete
        batch = await delete(user_id=1, entity_type="project", entity_id=3)
    assert isinstance(batch, str)
    assert session.execute.await_count == 7


@pytest.mark.asyncio
async def test_delete_rulebook_cascades_topics_and_rules():
    session = make_mock_session()
    topic_ids_result = MagicMock()
    topic_ids_result.scalars.return_value.all.return_value = [10, 11]
    # exists-check, topic-id select, then 3 updates (rules, topics, rulebook)
    session.execute = AsyncMock(side_effect=[
        _exists_result(True), topic_ids_result, MagicMock(), MagicMock(), MagicMock(),
    ])
    with patch("scribe.services.trash.async_session") as cls:
        cls.return_value = session
        from scribe.services.trash import delete
        batch = await delete(user_id=7, entity_type="rulebook", entity_id=2)
    assert isinstance(batch, str)
    assert session.execute.await_count == 5


def _rowcount_result(n):
    r = MagicMock()
    r.rowcount = n
    return r


@pytest.mark.asyncio
async def test_restore_clears_batch_across_all_models():
    session = make_mock_session()
    # 6 soft-deletable models, each returns a rowcount
    session.execute = AsyncMock(side_effect=[_rowcount_result(i) for i in [2, 0, 1, 1, 0, 0]])
    with patch("scribe.services.trash.async_session") as cls:
        cls.return_value = session
        from scribe.services.trash import restore
        n = await restore(user_id=1, batch_id="abc")
    assert n == 4
    assert session.execute.await_count == 6
    assert session.commit.called


@pytest.mark.asyncio
async def test_purge_expired_skips_when_retention_zero():
    session = make_mock_session()
    session.execute = AsyncMock()
    with patch("scribe.services.trash.async_session") as cls:
        cls.return_value = session
        from scribe.services.trash import purge_expired
        n = await purge_expired(1, 0)
    assert n == 0
    assert not session.execute.called  # never opens a delete


@pytest.mark.asyncio
async def test_purge_expired_deletes_across_models_when_positive():
    session = make_mock_session()
    session.execute = AsyncMock(side_effect=[_rowcount_result(1) for _ in range(6)])
    with patch("scribe.services.trash.async_session") as cls:
        cls.return_value = session
        from scribe.services.trash import purge_expired
        n = await purge_expired(1, 90)
    assert n == 6
    assert session.execute.await_count == 6


def test_owner_clause_scopes_every_model():
    """Regression: every trash op must owner-scope, including topics/rules
    which previously had NO owner check (IDOR across tenants)."""
    from scribe.services.trash import _owner_clause, _MODEL_FOR
    from scribe.models.note import Note
    from scribe.models.rulebook import Rulebook, RulebookTopic, Rule

    # Models with a direct owner column.
    assert "user_id" in str(_owner_clause(Note, 7))
    assert "owner_user_id" in str(_owner_clause(Rulebook, 7))

    # Topics/rules carry no user_id — ownership is derived through the
    # parent rulebook (and, for rules, the owning project).
    topic_sql = str(_owner_clause(RulebookTopic, 7))
    assert "rulebooks" in topic_sql and "owner_user_id" in topic_sql
    rule_sql = str(_owner_clause(Rule, 7))
    assert "owner_user_id" in rule_sql and "projects" in rule_sql

    # Every entity type resolves to a model that yields a non-empty clause.
    for model in set(_MODEL_FOR.values()):
        assert _owner_clause(model, 1) is not None


@pytest.mark.asyncio
async def test_list_trash_groups_by_batch():
    session = make_mock_session()

    def _note(id, batch, title):
        from datetime import datetime, timezone
        n = MagicMock()
        n.id = id; n.deleted_batch_id = batch; n.title = title
        n.deleted_at = datetime(2026, 5, 28, tzinfo=timezone.utc)
        return n

    # Note model returns 2 rows in one batch; the other 6 models return none.
    note_rows = MagicMock()
    note_rows.scalars.return_value.all.return_value = [_note(1, "b1", "Task A"), _note(2, "b1", "Sub")]
    empty = MagicMock()
    empty.scalars.return_value.all.return_value = []
    session.execute = AsyncMock(side_effect=[note_rows] + [empty] * 6)
    with patch("scribe.services.trash.async_session") as cls:
        cls.return_value = session
        from scribe.services.trash import list_trash
        out = await list_trash(user_id=1)
    assert len(out) == 1
    assert out[0]["batch_id"] == "b1"
    assert out[0]["count"] == 2
    assert out[0]["summary"] == "Task A"
