import os
import gc
import tempfile
from unittest.mock import patch

import pytest

from app import db as db_module
from app import keyword_extractor


@pytest.fixture
def tmp_db(monkeypatch):
    fd, path = tempfile.mkstemp(suffix=".db")
    os.close(fd)
    monkeypatch.setattr(db_module, "DB_PATH", path)
    db_module.init_db()
    yield path
    gc.collect()
    for ext in ("", "-wal", "-shm"):
        try:
            os.remove(path + ext)
        except OSError:
            pass


def test_extract_with_weights_proportional(tmp_db, monkeypatch):
    calls = []

    def fake_extract(category, limit):
        calls.append((category, limit))
        return [{"id": i, "keyword": f"{category}{i}", "category": category, "score": 0.5}
                for i in range(limit)]

    monkeypatch.setattr(keyword_extractor, "extract_for_category", fake_extract)
    out = keyword_extractor.extract_with_weights(
        {"economy": 0.6, "psychology": 0.3, "celebrity": 0.1}, total_limit=10,
    )
    by_cat = {c: l for c, l in calls}
    assert by_cat == {"economy": 6, "psychology": 3, "celebrity": 1}
    assert len(out) == 10


def test_extract_with_weights_skips_zero(tmp_db, monkeypatch):
    calls = []

    def fake_extract(category, limit):
        calls.append((category, limit))
        return []

    monkeypatch.setattr(keyword_extractor, "extract_for_category", fake_extract)
    keyword_extractor.extract_with_weights(
        {"economy": 1.0, "celebrity": 0.0}, total_limit=10,
    )
    cats_called = [c for c, _ in calls]
    assert "celebrity" not in cats_called
    assert "economy" in cats_called


def test_extract_with_weights_fallback_to_equal(tmp_db, monkeypatch):
    calls = []

    def fake_extract(category, limit):
        calls.append((category, limit))
        return []

    monkeypatch.setattr(keyword_extractor, "extract_for_category", fake_extract)
    keyword_extractor.extract_with_weights({}, total_limit=9)
    by_cat = {c: l for c, l in calls}
    assert set(by_cat.keys()) == {"economy", "psychology", "celebrity"}
    assert all(l == 3 for l in by_cat.values())