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

import pytest

from app import db as db_module
from app import trend_collector


@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


NAVER_RESPONSE = {
    "items": [
        {"title": "<b>기준금리</b> 인상", "link": "https://n.news.naver.com/a/1", "description": "한국은행 발표"},
        {"title": "환율 급등", "link": "https://n.news.naver.com/a/2", "description": "달러 강세"},
        {"title": "기준금리 추가 인상", "link": "https://n.news.naver.com/a/3", "description": "추가 발표"},
    ],
}


def test_fetch_naver_popular_extracts_top_terms(tmp_db, monkeypatch):
    fake_resp = MagicMock()
    fake_resp.json.return_value = NAVER_RESPONSE
    fake_resp.raise_for_status.return_value = None

    with patch.object(trend_collector.requests, "get", return_value=fake_resp):
        trends = trend_collector.fetch_naver_popular("economy", per_seed=10, top_n=5)

    keywords = [t["keyword"] for t in trends]
    assert "기준금리" in keywords
    for t in trends:
        assert t["category"] == "economy"
        assert t["source"] == "naver_popular"
        assert 0.0 <= t["score"] <= 1.0


def test_collect_naver_writes_to_db(tmp_db, monkeypatch):
    fake_resp = MagicMock()
    fake_resp.json.return_value = NAVER_RESPONSE
    fake_resp.raise_for_status.return_value = None
    with patch.object(trend_collector.requests, "get", return_value=fake_resp):
        n = trend_collector.collect_naver_popular_for(["economy"])
    assert n > 0
    rows = db_module.list_trends(source="naver_popular")
    assert len(rows) > 0
    assert all(r["source"] == "naver_popular" for r in rows)


def test_classify_keyword_with_cache(monkeypatch):
    calls = {"n": 0}

    def fake_claude(keyword: str) -> str:
        calls["n"] += 1
        return "economy"

    monkeypatch.setattr(trend_collector, "_llm_classify_one", fake_claude)
    trend_collector._category_cache.clear()

    c1 = trend_collector.classify_keyword("기준금리")
    c2 = trend_collector.classify_keyword("기준금리")
    assert c1 == c2 == "economy"
    assert calls["n"] == 1


def test_fetch_google_trends_parses_rss_and_classifies(tmp_db, monkeypatch):
    fake_rss = """<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0">
  <channel>
    <title>Daily Search Trends</title>
    <item><title>기준금리</title></item>
    <item><title>BTS 컴백</title></item>
    <item><title>스트레스 관리</title></item>
  </channel>
</rss>"""
    fake_resp = MagicMock()
    fake_resp.text = fake_rss
    fake_resp.raise_for_status.return_value = None
    monkeypatch.setattr(trend_collector.requests, "get", lambda *a, **kw: fake_resp)
    monkeypatch.setattr(trend_collector, "classify_keyword",
                        lambda kw: {"기준금리": "economy", "BTS 컴백": "celebrity",
                                    "스트레스 관리": "psychology"}.get(kw, "uncategorized"))

    trends = trend_collector.fetch_google_trends()
    by_kw = {t["keyword"]: t for t in trends}
    assert by_kw["기준금리"]["category"] == "economy"
    assert by_kw["BTS 컴백"]["category"] == "celebrity"
    assert by_kw["스트레스 관리"]["category"] == "psychology"
    assert all(t["source"] == "google_trends" for t in trends)


def test_collect_all_invokes_both_sources(tmp_db, monkeypatch):
    monkeypatch.setattr(trend_collector, "collect_naver_popular_for",
                        lambda cats: 5)
    monkeypatch.setattr(trend_collector, "collect_google_trends",
                        lambda: 3)
    out = trend_collector.collect_all(["economy"])
    assert out == {"naver_popular": 5, "google_trends": 3}


def test_fetch_google_trends_graceful_on_rss_failure(monkeypatch):
    fake_resp = MagicMock()
    fake_resp.raise_for_status.side_effect = RuntimeError("Google returned 404")
    monkeypatch.setattr(trend_collector.requests, "get", lambda *a, **kw: fake_resp)
    out = trend_collector.fetch_google_trends()
    assert out == []


def test_seeds_for_filters_placeholder(tmp_db, monkeypatch):
    """category_seeds 템플릿에 placeholder '...'가 들어가도 DEFAULT 폴백."""
    from app import db as db_module
    db_module.upsert_prompt_template(
        "category_seeds",
        '{"economy": ["...", "…", "a", "real_keyword"]}',
        "test",
    )
    out = trend_collector._seeds_for("economy")
    # '...', '…', 'a'(2자 미만)는 필터링되고 'real_keyword'만 남음
    assert out == ["real_keyword"]


def test_seeds_for_falls_back_when_all_invalid(tmp_db, monkeypatch):
    """모든 시드가 invalid면 DEFAULT_CATEGORY_SEEDS 폴백."""
    from app import db as db_module
    db_module.upsert_prompt_template(
        "category_seeds",
        '{"economy": ["...", "TBD", ""]}',
        "test",
    )
    out = trend_collector._seeds_for("economy")
    # DEFAULT_CATEGORY_SEEDS["economy"] 가 반환되어야 함
    from app.config import DEFAULT_CATEGORY_SEEDS
    assert out == list(DEFAULT_CATEGORY_SEEDS["economy"])