import os
import sys
from pathlib import Path
from time import sleep

import pytest
from fastapi.testclient import TestClient

# Ensure required env vars for app import/config
os.environ.setdefault("SECRET_KEY", "x" * 32)
os.environ.setdefault("DATABASE_URL", "sqlite:////tmp/delphi_test.sqlite")

ROOT = Path(__file__).resolve().parents[1]
if str(ROOT) not in sys.path:
    sys.path.insert(0, str(ROOT))

from app.main import app  # noqa: E402
from app.auth.security import get_current_user  # noqa: E402
from app.config import settings  # noqa: E402
from app.services.cache import invalidate_search_cache  # noqa: E402


@pytest.fixture(scope="module")
def client():
    class _User:
        def __init__(self):
            self.id = "cache-tester"
            self.username = "tester"
            self.is_admin = True
            self.is_active = True

    app.dependency_overrides[get_current_user] = lambda: _User()

    # Enable cache for this test module if redis is configured
    settings.cache_enabled = True
    yield TestClient(app)
    app.dependency_overrides.pop(get_current_user, None)


@pytest.mark.skipif(not settings.redis_url, reason="Redis not configured for caching tests")
def test_advanced_search_caches_by_criteria_and_user(client: TestClient):
    criteria = {
        "query": "cache-token",
        "search_types": ["customer"],
        "limit": 10,
        "offset": 0,
    }

    # First call: cold cache
    r1 = client.post("/api/search/advanced", json=criteria)
    assert r1.status_code == 200
    d1 = r1.json()

    # Second call: should be served from cache and identical
    r2 = client.post("/api/search/advanced", json=criteria)
    assert r2.status_code == 200
    d2 = r2.json()
    assert d1 == d2


@pytest.mark.skipif(not settings.redis_url, reason="Redis not configured for caching tests")
def test_advanced_search_cache_invalidation_on_data_change(client: TestClient):
    criteria = {
        "query": "invalidate-token",
        "search_types": ["customer"],
        "limit": 10,
        "offset": 0,
    }

    r1 = client.post("/api/search/advanced", json=criteria)
    assert r1.status_code == 200
    d1 = r1.json()

    # Mutate data via customers API which triggers invalidation
    resp = client.post("/api/customers/", json={
        "id": "CACHE-INVALIDATE-1",
        "last": "Cache",
        "first": "Invalidate",
        "email": "invalidate@example.com",
        "city": "Austin",
        "abrev": "TX",
    })
    assert resp.status_code == 200

    # Best-effort async invalidation; give Redis a moment if needed
    sleep(0.05)

    r2 = client.post("/api/search/advanced", json=criteria)
    assert r2.status_code == 200
    d2 = r2.json()
    # Total_results or results content may change; at minimum the payload should not be the same object
    assert d1 != d2