"""Offline tests for scraper_settings service (no DB required).

Тестируем логику max(per_source, global) через монкей-патч _get_setting_cached.
"""

import os

os.environ.setdefault("DATABASE_URL", "postgresql+psycopg://test:test@localhost:5432/test")

from unittest.mock import MagicMock, patch

import pytest

import app.services.scraper_settings as ss_mod
from app.services.scraper_settings import get_scraper_delay, invalidate_cache


# ── helpers ──────────────────────────────────────────────────────────────────


def _make_mock_session(values: dict[str, float | None]) -> MagicMock:
    """Создать mock сессии БД с фиксированными значениями per source key."""

    mock_db = MagicMock()

    def fake_execute(sql, params):
        key = params["s"]
        result = MagicMock()
        val = values.get(key)
        result.first.return_value = (val,) if val is not None else None
        return result

    mock_db.execute = fake_execute
    mock_db.__enter__ = MagicMock(return_value=mock_db)
    mock_db.__exit__ = MagicMock(return_value=False)
    return mock_db


# ── tests ─────────────────────────────────────────────────────────────────────


def test_global_delay_takes_precedence_when_higher(monkeypatch):
    """global=10 > avito=7 → возвращает 10."""
    invalidate_cache()

    mock_db = _make_mock_session({"avito": 7.0, "global": 10.0})
    monkeypatch.setattr(ss_mod, "_open_session", lambda: mock_db)

    delay = get_scraper_delay("avito")
    assert delay == 10.0


def test_per_source_takes_precedence_when_higher(monkeypatch):
    """avito=7 > global=2 → возвращает 7."""
    invalidate_cache()

    mock_db = _make_mock_session({"avito": 7.0, "global": 2.0})
    monkeypatch.setattr(ss_mod, "_open_session", lambda: mock_db)

    delay = get_scraper_delay("avito")
    assert delay == 7.0


def test_global_zero_means_no_floor(monkeypatch):
    """global=0 → используется только per-source значение."""
    invalidate_cache()

    mock_db = _make_mock_session({"cian": 5.0, "global": 0.0})
    monkeypatch.setattr(ss_mod, "_open_session", lambda: mock_db)

    delay = get_scraper_delay("cian")
    assert delay == 5.0


def test_missing_per_source_row_uses_class_default(monkeypatch):
    """Если строки source в БД нет — фолбек на _DEFAULT_DELAY_BY_SOURCE."""
    invalidate_cache()

    # n1 строки нет в БД, global=0
    mock_db = _make_mock_session({"n1": None, "global": 0.0})
    monkeypatch.setattr(ss_mod, "_open_session", lambda: mock_db)

    delay = get_scraper_delay("n1")
    # Дефолт для n1 = 5.0
    assert delay == ss_mod._DEFAULT_DELAY_BY_SOURCE["n1"]


def test_unknown_source_uses_global_default(monkeypatch):
    """Неизвестный source без строки в БД — _GLOBAL_DEFAULT_DELAY."""
    invalidate_cache()

    mock_db = _make_mock_session({"some_new_source": None, "global": 0.0})
    monkeypatch.setattr(ss_mod, "_open_session", lambda: mock_db)

    delay = get_scraper_delay("some_new_source")
    assert delay == ss_mod._GLOBAL_DEFAULT_DELAY


def test_db_error_falls_back_to_default(monkeypatch):
    """Ошибка БД → graceful fallback на дефолт, не crash."""
    invalidate_cache()

    def broken_open():
        raise RuntimeError("DB is down")

    monkeypatch.setattr(ss_mod, "_open_session", broken_open)

    # Не должно кидать исключение
    delay = get_scraper_delay("avito")
    # При ошибке: per_source → _DEFAULT_DELAY_BY_SOURCE['avito'] = 7.0, global → 0.0
    assert delay == 7.0


def test_invalidate_cache_single_source(monkeypatch):
    """invalidate_cache(source) удаляет только указанный source."""
    invalidate_cache()

    mock_db = _make_mock_session({"cian": 5.0, "avito": 7.0, "global": 0.0})
    monkeypatch.setattr(ss_mod, "_open_session", lambda: mock_db)

    # Прогреть кеш для cian и avito
    get_scraper_delay("cian")
    get_scraper_delay("avito")

    # Сбросить только cian
    invalidate_cache("cian")

    with ss_mod._CACHE_LOCK:
        assert "cian" not in ss_mod._CACHE
        assert "avito" in ss_mod._CACHE


def test_invalidate_cache_all(monkeypatch):
    """invalidate_cache() без аргумента очищает весь кеш."""
    invalidate_cache()

    mock_db = _make_mock_session({"avito": 7.0, "global": 0.0})
    monkeypatch.setattr(ss_mod, "_open_session", lambda: mock_db)

    get_scraper_delay("avito")

    invalidate_cache()

    with ss_mod._CACHE_LOCK:
        assert len(ss_mod._CACHE) == 0


def test_global_missing_row_treated_as_zero(monkeypatch):
    """Если строки 'global' нет в БД — фолбек 0.0 (не применяем floor)."""
    invalidate_cache()

    mock_db = _make_mock_session({"avito": 7.0, "global": None})
    monkeypatch.setattr(ss_mod, "_open_session", lambda: mock_db)

    delay = get_scraper_delay("avito")
    assert delay == 7.0


# ── Admin API integration smoke ───────────────────────────────────────────────


def test_list_scraper_settings_endpoint(monkeypatch):
    """GET /scraper-settings — эндпоинт монтируется, возвращает список."""
    import sys
    from unittest.mock import MagicMock as MM

    # Stub weasyprint (нет на CI)
    _wp = MM()
    sys.modules.setdefault("weasyprint", _wp)

    from fastapi.testclient import TestClient

    from app.api.v1 import admin as admin_module
    from app.core.db import get_db
    from fastapi import FastAPI

    app = FastAPI()
    app.include_router(admin_module.router, prefix="/api/v1/admin")

    fake_rows = [
        {"source": "avito", "request_delay_sec": 7.0, "description": "Avito", "updated_at": None},
        {"source": "global", "request_delay_sec": 0.0, "description": "Global", "updated_at": None},
    ]

    mock_db = MM()
    mock_db.execute.return_value.mappings.return_value.all.return_value = fake_rows
    app.dependency_overrides[get_db] = lambda: mock_db

    client = TestClient(app)
    r = client.get("/api/v1/admin/scraper-settings")
    assert r.status_code == 200
    data = r.json()
    assert "settings" in data
    sources = [s["source"] for s in data["settings"]]
    assert "global" in sources
    assert "avito" in sources