from __future__ import annotations

import pytest
from flask import Flask, g, jsonify
from flask_login import LoginManager

import db_pool
from db.schema import ensure_schema
from security import init_security_middleware


@pytest.fixture()
def _test_db(tmp_path):
    db_file = tmp_path / "security_middleware_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 _make_app(monkeypatch, _test_db, *, security_enabled: bool = True, honeypot_enabled: bool = True) -> Flask:
    import security.middleware as sm
    import security.response_handler as rh

    # 避免测试因风控延迟而变慢
    monkeypatch.setattr(rh.time, "sleep", lambda _seconds: None)

    # 每个测试用例保持 handler/honeypot 的懒加载状态
    sm.handler = None
    sm.honeypot = None

    app = Flask(__name__)
    app.config.update(
        SECRET_KEY="test-secret",
        TESTING=True,
        SECURITY_ENABLED=bool(security_enabled),
        HONEYPOT_ENABLED=bool(honeypot_enabled),
        SECURITY_LOG_LEVEL="CRITICAL",  # 降低测试日志噪音
    )

    login_manager = LoginManager()
    login_manager.init_app(app)

    @login_manager.user_loader
    def _load_user(_user_id: str):
        return None

    init_security_middleware(app)
    return app


def _client_get(app: Flask, path: str, *, ip: str = "1.2.3.4"):
    return app.test_client().get(path, environ_overrides={"REMOTE_ADDR": ip})


def test_middleware_blocks_banned_ip(_test_db, monkeypatch):
    app = _make_app(monkeypatch, _test_db)

    @app.get("/api/ping")
    def _ping():
        return jsonify({"ok": True})

    import security.middleware as sm

    sm.blacklist.ban_ip("1.2.3.4", reason="test", duration_hours=1, permanent=False)

    resp = _client_get(app, "/api/ping", ip="1.2.3.4")
    assert resp.status_code == 503
    assert resp.get_json() == {"error": "服务暂时繁忙，请稍后重试"}


def test_middleware_skips_static_requests(_test_db, monkeypatch):
    app = _make_app(monkeypatch, _test_db)

    @app.get("/static/test")
    def _static_test():
        return "ok"

    import security.middleware as sm

    sm.blacklist.ban_ip("1.2.3.4", reason="test", duration_hours=1, permanent=False)

    resp = _client_get(app, "/static/test", ip="1.2.3.4")
    assert resp.status_code == 200
    assert resp.get_data(as_text=True) == "ok"


def test_middleware_honeypot_short_circuits_side_effects(_test_db, monkeypatch):
    app = _make_app(monkeypatch, _test_db, honeypot_enabled=True)

    called = {"count": 0}

    @app.get("/api/side-effect")
    def _side_effect():
        called["count"] += 1
        return jsonify({"real": True})

    resp = _client_get(app, "/api/side-effect?q=${${a}}", ip="9.9.9.9")
    assert resp.status_code == 200
    payload = resp.get_json()
    assert isinstance(payload, dict)
    assert payload.get("success") is True
    assert called["count"] == 0


def test_middleware_fails_open_on_internal_errors(_test_db, monkeypatch):
    app = _make_app(monkeypatch, _test_db)

    @app.get("/api/ok")
    def _ok():
        return jsonify({"ok": True, "risk_score": getattr(g, "risk_score", None)})

    import security.middleware as sm

    def boom(*_args, **_kwargs):
        raise RuntimeError("boom")

    monkeypatch.setattr(sm.blacklist, "is_ip_banned", boom)
    monkeypatch.setattr(sm.detector, "scan_input", boom)

    resp = _client_get(app, "/api/ok", ip="2.2.2.2")
    assert resp.status_code == 200
    assert resp.get_json()["ok"] is True


def test_middleware_sets_request_context_fields(_test_db, monkeypatch):
    app = _make_app(monkeypatch, _test_db)

    @app.get("/api/context")
    def _context():
        strategy = getattr(g, "response_strategy", None)
        action = getattr(getattr(strategy, "action", None), "value", None)
        return jsonify({"risk_score": getattr(g, "risk_score", None), "action": action})

    resp = _client_get(app, "/api/context", ip="8.8.8.8")
    assert resp.status_code == 200
    assert resp.get_json() == {"risk_score": 0, "action": "allow"}