import pytest

from backend.app.celery_app import celery
from backend.app.models import TagKind
from backend.app.services.tag_service import TagService

pytestmark = pytest.mark.integration


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


@pytest.mark.asyncio
async def test_get_and_patch_settings(client):
    resp = await client.get("/api/ml/settings")
    assert resp.status_code == 200
    body = await resp.get_json()
    # Default raised 0.50 → 0.70 on 2026-06-02 (alembic 0033) — 0.50
    # was too noisy in practice. The 0.70 default keeps the rail
    # signal-rich without hiding everything like the original 0.95.
    assert body["suggestion_threshold_general"] == pytest.approx(0.70)
    # Retired threshold columns must not appear in the payload.
    assert "suggestion_threshold_artist" not in body
    assert "suggestion_threshold_copyright" not in body

    resp = await client.patch(
        "/api/ml/settings", json={"suggestion_threshold_general": 0.90}
    )
    assert resp.status_code == 200
    assert (await resp.get_json())["suggestion_threshold_general"] == pytest.approx(0.90)


@pytest.mark.asyncio
async def test_tagger_store_floor_default_and_patch(client):
    body = await (await client.get("/api/ml/settings")).get_json()
    assert body["tagger_store_floor"] == pytest.approx(0.70)

    resp = await client.patch("/api/ml/settings", json={"tagger_store_floor": 0.6})
    assert resp.status_code == 200
    assert (await resp.get_json())["tagger_store_floor"] == pytest.approx(0.6)


@pytest.mark.asyncio
async def test_suggestion_threshold_below_store_floor_rejected(client):
    # Invariant (#764): a category threshold can't sit below the store floor —
    # nothing below the floor is stored, so the gap would surface nothing.
    # Floor defaults to 0.70; pushing general down to 0.50 must 400.
    resp = await client.patch(
        "/api/ml/settings", json={"suggestion_threshold_general": 0.50}
    )
    assert resp.status_code == 400
    assert "tagger_store_floor" in (await resp.get_json())["error"]


@pytest.mark.asyncio
async def test_video_tagging_settings_default_and_patch(client):
    """#747: video cadence/noise knobs are exposed + patchable."""
    body = await (await client.get("/api/ml/settings")).get_json()
    assert body["video_frame_interval_seconds"] == pytest.approx(4.0)
    assert body["video_max_frames"] == 64
    assert body["video_min_tag_frames"] == 3

    resp = await client.patch(
        "/api/ml/settings",
        json={"video_frame_interval_seconds": 5, "video_max_frames": 40,
              "video_min_tag_frames": 4},
    )
    assert resp.status_code == 200
    out = await resp.get_json()
    assert out["video_frame_interval_seconds"] == pytest.approx(5.0)
    assert out["video_max_frames"] == 40
    assert out["video_min_tag_frames"] == 4


@pytest.mark.asyncio
async def test_video_min_tag_frames_above_max_rejected(client):
    resp = await client.patch(
        "/api/ml/settings",
        json={"video_max_frames": 10, "video_min_tag_frames": 20},
    )
    assert resp.status_code == 400
    assert "video_min_tag_frames" in (await resp.get_json())["error"]


@pytest.mark.asyncio
async def test_backfill_and_recompute_trigger(client):
    r1 = await client.post("/api/ml/backfill")
    assert r1.status_code == 202
    r2 = await client.post("/api/ml/recompute-centroids")
    assert r2.status_code == 202


@pytest.mark.asyncio
async def test_rename_tag(client, db):
    tag = await TagService(db).find_or_create("oldname", TagKind.character)
    await db.commit()
    resp = await client.patch(f"/api/tags/{tag.id}", json={"name": "New Name"})
    assert resp.status_code == 200
    assert (await resp.get_json())["name"] == "New Name"


@pytest.mark.asyncio
async def test_rename_collision_409(client, db):
    svc = TagService(db)
    await svc.find_or_create("Taken", TagKind.character)
    other = await svc.find_or_create("Mover", TagKind.character)
    await db.commit()
    resp = await client.patch(f"/api/tags/{other.id}", json={"name": "Taken"})
    assert resp.status_code == 409
