import pytest

from backend.app import create_app
from backend.app.models import ImageRecord, TagKind
from backend.app.models.tag import image_tag
from backend.app.services.ml.suggestions import SuggestionService
from backend.app.services.tag_service import TagService

pytestmark = pytest.mark.integration


def _img(sha: str, predictions: dict) -> ImageRecord:
    return ImageRecord(
        path=f"/images/{sha}.jpg", sha256=sha, size_bytes=1,
        mime="image/jpeg", width=1, height=1,
        origin="imported_filesystem", integrity_status="unknown",
        tagger_predictions=predictions,
    )


@pytest.mark.asyncio
async def test_consensus_includes_tag_over_threshold(db):
    tags = TagService(db)
    t = await tags.find_or_create("sword", TagKind.general)
    a = _img("a" * 64, {"sword": {"category": "general", "confidence": 0.97}})
    b = _img("b" * 64, {"sword": {"category": "general", "confidence": 0.95}})
    db.add_all([a, b])
    await db.flush()
    res = await SuggestionService(db).for_selection([a.id, b.id], threshold=0.8)
    gen = res["general"]
    assert any(s["canonical_tag_id"] == t.id for s in gen)
    s = next(s for s in gen if s["canonical_tag_id"] == t.id)
    assert s["coverage"] == 1.0
    assert 0.95 <= s["confidence"] <= 0.97


@pytest.mark.asyncio
async def test_consensus_counts_already_applied_for_coverage(db):
    tags = TagService(db)
    t = await tags.find_or_create("sky", TagKind.general)
    a = _img("c" * 64, {"sky": {"category": "general", "confidence": 0.96}})
    b = _img("d" * 64, {})  # no prediction
    db.add_all([a, b])
    await db.flush()
    # b already has the tag applied -> counts toward coverage, not confidence
    await db.execute(
        image_tag.insert().values(
            image_record_id=b.id, tag_id=t.id, source="manual"
        )
    )
    res = await SuggestionService(db).for_selection([a.id, b.id], threshold=0.8)
    s = next(s for s in res["general"] if s["canonical_tag_id"] == t.id)
    assert s["coverage"] == 1.0          # 1 suggested + 1 applied / 2
    assert s["confidence"] == pytest.approx(0.96, abs=1e-4)


@pytest.mark.asyncio
async def test_consensus_excludes_below_threshold(db):
    tags = TagService(db)
    await tags.find_or_create("rare", TagKind.general)
    a = _img("e" * 64, {"rare": {"category": "general", "confidence": 0.96}})
    b = _img("f" * 64, {})
    db.add_all([a, b])
    await db.flush()
    res = await SuggestionService(db).for_selection([a.id, b.id], threshold=0.8)
    assert all(
        s["name"] != "rare" for s in res.get("general", [])
    )  # coverage 0.5 < 0.8


@pytest.mark.asyncio
async def test_consensus_skips_creates_new_tag(db):
    a = _img("g" * 64, {"neverseen": {"category": "general", "confidence": 0.99}})
    b = _img("h" * 64, {"neverseen": {"category": "general", "confidence": 0.99}})
    db.add_all([a, b])
    await db.flush()
    res = await SuggestionService(db).for_selection([a.id, b.id], threshold=0.8)
    # 'neverseen' has no Tag row -> creates_new_tag -> excluded from consensus
    assert all(s["name"] != "neverseen" for s in res.get("general", []))


@pytest.mark.asyncio
async def test_consensus_threshold_clamped_and_empty_for_no_ids(db):
    res = await SuggestionService(db).for_selection([], threshold=5.0)
    assert res == {}


@pytest.mark.asyncio
async def test_bulk_suggestions_route(db):

    tags = TagService(db)
    await tags.find_or_create("sword", TagKind.general)
    a = _img("i" * 64, {"sword": {"category": "general", "confidence": 0.97}})
    db.add(a)
    await db.commit()
    app = create_app()
    async with app.test_client() as c:
        resp = await c.post(
            "/api/suggestions/bulk", json={"image_ids": [a.id]}
        )
        assert resp.status_code == 200
        body = await resp.get_json()
        assert body["evaluated"] == 1
        assert body["threshold"] == 0.8
        assert "suggestions" in body


@pytest.mark.asyncio
async def test_bulk_suggestions_requires_ids(db):

    app = create_app()
    async with app.test_client() as c:
        resp = await c.post("/api/suggestions/bulk", json={})
        assert resp.status_code == 400