from datetime import UTC, datetime, timedelta

import pytest

from backend.app import create_app
from backend.app.celery_app import celery
from backend.app.models import ImportBatch, ImportTask

pytestmark = pytest.mark.integration


@pytest.fixture(autouse=True)
def eager():
    celery.conf.task_always_eager = True
    yield
    celery.conf.task_always_eager = False


@pytest.fixture
async def app():
    return create_app()


@pytest.fixture
async def client(app):
    async with app.test_client() as c:
        yield c


@pytest.mark.asyncio
async def test_status_when_idle(client):
    resp = await client.get("/api/import/status")
    body = await resp.get_json()
    assert body["active_batch"] is None


@pytest.mark.asyncio
async def test_list_tasks_with_status_filter(client, db):
    batch = ImportBatch(triggered_by="manual", source_path="/import", scan_mode="quick")
    db.add(batch)
    await db.flush()
    for status in ("complete", "failed", "complete"):
        db.add(ImportTask(
            batch_id=batch.id, source_path="/x", task_type="media", status=status,
            finished_at=datetime.now(UTC),
        ))
    await db.commit()

    resp = await client.get("/api/import/tasks?status=failed")
    body = await resp.get_json()
    assert len(body["tasks"]) == 1
    assert body["tasks"][0]["status"] == "failed"


@pytest.mark.asyncio
async def test_retry_failed(client, db):
    batch = ImportBatch(triggered_by="manual", source_path="/import", scan_mode="quick")
    db.add(batch)
    await db.flush()
    db.add(ImportTask(batch_id=batch.id, source_path="/x", task_type="media", status="failed"))
    await db.commit()

    resp = await client.post("/api/import/retry-failed")
    body = await resp.get_json()
    assert body["retried"] == 1


@pytest.mark.asyncio
async def test_clear_completed(client, db):
    batch = ImportBatch(triggered_by="manual", source_path="/import", scan_mode="quick")
    db.add(batch)
    await db.flush()
    long_ago = datetime.now(UTC) - timedelta(days=30)
    db.add(ImportTask(
        batch_id=batch.id, source_path="/x", task_type="media",
        status="complete", finished_at=long_ago,
    ))
    db.add(ImportTask(
        batch_id=batch.id, source_path="/y", task_type="media",
        status="complete", finished_at=datetime.now(UTC),
    ))
    await db.commit()

    resp = await client.post("/api/import/clear-completed", json={"age_days": 7})
    body = await resp.get_json()
    assert body["deleted"] == 1


@pytest.mark.asyncio
async def test_clear_stuck_fails_non_terminal_and_finalizes_orphan_batch(client, db):
    """Operator-flagged 2026-05-25: 3 large PNGs got stuck in 'processing'
    for 2 days, the active ImportBatch never finalized, and the UI's
    'Scanning...' banner persisted with 0/0 files. /api/import/clear-stuck
    is the escape hatch to break the autoretry loop manually."""
    from sqlalchemy import select as _select

    batch = ImportBatch(triggered_by="manual", source_path="/import", scan_mode="quick")
    db.add(batch)
    await db.flush()
    # Three stuck rows in mixed non-terminal states.
    db.add(ImportTask(
        batch_id=batch.id, source_path="/p1", task_type="media", status="processing",
    ))
    db.add(ImportTask(
        batch_id=batch.id, source_path="/p2", task_type="media", status="queued",
    ))
    db.add(ImportTask(
        batch_id=batch.id, source_path="/p3", task_type="media", status="pending",
    ))
    # One already-complete row should be untouched.
    db.add(ImportTask(
        batch_id=batch.id, source_path="/done", task_type="media",
        status="complete", finished_at=datetime.now(UTC),
    ))
    await db.commit()

    resp = await client.post("/api/import/clear-stuck")
    body = await resp.get_json()
    assert resp.status_code == 200
    assert body["tasks_failed"] == 3
    assert body["batches_finalized"] == 1

    statuses = {
        row.status for row in
        (await db.execute(_select(ImportTask).where(ImportTask.batch_id == batch.id)))
        .scalars().all()
    }
    assert statuses == {"failed", "complete"}

    batch_status = (await db.execute(
        _select(ImportBatch.status).where(ImportBatch.id == batch.id)
    )).scalar_one()
    assert batch_status == "complete"


@pytest.mark.asyncio
async def test_clear_stuck_no_op_when_nothing_stuck(client, db):
    resp = await client.post("/api/import/clear-stuck")
    body = await resp.get_json()
    assert resp.status_code == 200
    assert body == {"tasks_failed": 0, "batches_finalized": 0}


@pytest.mark.asyncio
async def test_trigger_accepts_deep(client, monkeypatch):
    # Stub the task dispatch — assert the API accepts 'deep' and forwards
    # mode, without running the real (eager) scan_directory.
    from backend.app.tasks import scan as scan_mod

    seen = {}

    class _Res:
        id = "celery-deep"

    def _fake_delay(*, triggered_by, mode):
        seen["triggered_by"] = triggered_by
        seen["mode"] = mode
        return _Res()

    monkeypatch.setattr(scan_mod.scan_directory, "delay", _fake_delay)
    resp = await client.post("/api/import/trigger", json={"mode": "deep"})
    assert resp.status_code == 202
    body = await resp.get_json()
    assert body["mode"] == "deep"
    assert seen == {"triggered_by": "manual", "mode": "deep"}


@pytest.mark.asyncio
async def test_trigger_still_rejects_unknown_mode(client):
    resp = await client.post("/api/import/trigger", json={"mode": "wat"})
    assert resp.status_code == 400


@pytest.mark.asyncio
async def test_trigger_accepts_verify(client, monkeypatch):
    # Stub the verify task's dispatch so the API contract is asserted
    # without running the real (eager) verify_integrity end-to-end.
    from backend.app.tasks import maintenance as m

    seen = {}

    class _Res:
        id = "celery-verify"

    def _fake_delay():
        seen["called"] = True
        return _Res()

    monkeypatch.setattr(m.verify_integrity, "delay", _fake_delay)
    resp = await client.post("/api/import/trigger", json={"mode": "verify"})
    assert resp.status_code == 202
    body = await resp.get_json()
    assert body["mode"] == "verify"
    assert seen == {"called": True}