from __future__ import annotations

from datetime import timedelta

import pytest

import db_pool
from db.schema import ensure_schema
from db.utils import get_cst_now
from security import constants as C
from security.blacklist import BlacklistManager
from security.risk_scorer import RiskScorer


@pytest.fixture()
def _test_db(tmp_path):
    db_file = tmp_path / "risk_scorer_test.db"

    old_pool = getattr(db_pool, "_pool", None)
    try:
        if old_pool is not None:
            try:
                old_pool.close_all()
            except Exception:
                pass
        db_pool._pool = None
        db_pool.init_pool(str(db_file), pool_size=1)

        with db_pool.get_db() as conn:
            ensure_schema(conn)

        yield db_file
    finally:
        try:
            if getattr(db_pool, "_pool", None) is not None:
                db_pool._pool.close_all()
        except Exception:
            pass
        db_pool._pool = old_pool


def test_record_threat_updates_scores_and_combined(_test_db):
    manager = BlacklistManager()
    scorer = RiskScorer(blacklist_manager=manager)

    ip = "1.2.3.4"
    user_id = 123

    assert scorer.get_ip_score(ip) == 0
    assert scorer.get_user_score(user_id) == 0
    assert scorer.get_combined_score(ip, user_id) == 0

    scorer.record_threat(ip, user_id, threat_type="sql_injection", score=30, request_path="/login", payload="x")

    assert scorer.get_ip_score(ip) == 30
    assert scorer.get_user_score(user_id) == 30
    assert scorer.get_combined_score(ip, user_id) == 30

    scorer.record_threat(ip, user_id, threat_type="sql_injection", score=80, request_path="/login", payload="y")

    assert scorer.get_ip_score(ip) == 100
    assert scorer.get_user_score(user_id) == 100
    assert scorer.get_combined_score(ip, user_id) == 100


def test_auto_ban_on_score_100(_test_db):
    manager = BlacklistManager()
    scorer = RiskScorer(blacklist_manager=manager)

    ip = "5.6.7.8"
    user_id = 456

    scorer.record_threat(ip, user_id, threat_type="sql_injection", score=100, request_path="/api", payload="boom")

    assert manager.is_ip_banned(ip) is True
    assert manager.is_user_banned(user_id) is True

    with db_pool.get_db() as conn:
        cursor = conn.cursor()
        cursor.execute("SELECT expires_at FROM ip_blacklist WHERE ip = ?", (ip,))
        row = cursor.fetchone()
        assert row is not None
        assert row["expires_at"] is not None

        cursor.execute("SELECT expires_at FROM user_blacklist WHERE user_id = ?", (user_id,))
        row = cursor.fetchone()
        assert row is not None
        assert row["expires_at"] is not None


def test_jndi_injection_permanent_ban(_test_db):
    manager = BlacklistManager()
    scorer = RiskScorer(blacklist_manager=manager)

    ip = "9.9.9.9"
    user_id = 999

    scorer.record_threat(ip, user_id, threat_type=C.THREAT_TYPE_JNDI_INJECTION, score=100, request_path="/", payload="${jndi:ldap://x}")

    assert manager.is_ip_banned(ip) is True
    assert manager.is_user_banned(user_id) is True

    with db_pool.get_db() as conn:
        cursor = conn.cursor()
        cursor.execute("SELECT expires_at FROM ip_blacklist WHERE ip = ?", (ip,))
        row = cursor.fetchone()
        assert row is not None
        assert row["expires_at"] is None

        cursor.execute("SELECT expires_at FROM user_blacklist WHERE user_id = ?", (user_id,))
        row = cursor.fetchone()
        assert row is not None
        assert row["expires_at"] is None


def test_high_risk_three_times_permanent_ban(_test_db):
    manager = BlacklistManager()
    scorer = RiskScorer(blacklist_manager=manager, high_risk_threshold=80, high_risk_permanent_ban_count=3)

    ip = "10.0.0.1"
    user_id = 1

    scorer.record_threat(ip, user_id, threat_type="nested_expression", score=80, request_path="/", payload="a")
    scorer.record_threat(ip, user_id, threat_type="nested_expression", score=80, request_path="/", payload="b")

    with db_pool.get_db() as conn:
        cursor = conn.cursor()
        cursor.execute("SELECT expires_at FROM ip_blacklist WHERE ip = ?", (ip,))
        row = cursor.fetchone()
        assert row is not None
        assert row["expires_at"] is not None  # score hits 100 => temporary ban first

    scorer.record_threat(ip, user_id, threat_type="nested_expression", score=80, request_path="/", payload="c")

    with db_pool.get_db() as conn:
        cursor = conn.cursor()
        cursor.execute("SELECT expires_at FROM ip_blacklist WHERE ip = ?", (ip,))
        row = cursor.fetchone()
        assert row is not None
        assert row["expires_at"] is None  # 3 high-risk threats => permanent

        cursor.execute("SELECT expires_at FROM user_blacklist WHERE user_id = ?", (user_id,))
        row = cursor.fetchone()
        assert row is not None
        assert row["expires_at"] is None


def test_decay_scores_hourly_10_percent(_test_db):
    manager = BlacklistManager()
    scorer = RiskScorer(blacklist_manager=manager)

    ip = "3.3.3.3"
    user_id = 11

    old_ts = (get_cst_now() - timedelta(hours=2)).strftime("%Y-%m-%d %H:%M:%S")

    with db_pool.get_db() as conn:
        cursor = conn.cursor()
        cursor.execute(
            """
            INSERT INTO ip_risk_scores (ip, risk_score, last_seen, created_at, updated_at)
            VALUES (?, 100, ?, ?, ?)
            """,
            (ip, old_ts, old_ts, old_ts),
        )
        cursor.execute(
            """
            INSERT INTO user_risk_scores (user_id, risk_score, last_seen, created_at, updated_at)
            VALUES (?, 100, ?, ?, ?)
            """,
            (user_id, old_ts, old_ts, old_ts),
        )
        conn.commit()

    scorer.decay_scores()

    assert scorer.get_ip_score(ip) == 81
    assert scorer.get_user_score(user_id) == 81