import json
import sqlite3
from types import SimpleNamespace

import numpy as np
import pytest
from fastapi.testclient import TestClient

import app.main as main
import app.routes as routes
import tools.runtime.tool_health as health
import tools.rag.build_sqlite_index as indexer
import tools.rag.search_core as search_core
from tools.sync.index_state import durable_json, PENDING_FILE, VERSION_FILE
from tools.retrieval.publication import PUBLICATION_POLICY_VERSION, effective_published
from tools.rag.search_utils import search_database
from tools.rag.rag_utils import build_rag_context


@pytest.fixture
def corpus(tmp_path, monkeypatch):
    docs = []
    chunks = []
    paths = [
        "pages/students/2020/eva/README.md",
        "pages/topics/missing/README.md",
        "pages/topics/hidden/README.md",
        "pages/students/2020/eva/private/README.md",
    ]
    for index, (path, published) in enumerate(zip(paths, [True, None, False, False])):
        title = ["Verejný profil", "Chýbajúca značka", "Skrytý dokument", "Skrytá poznámka"][index]
        text = "spoločný overovací výraz " + (
            "SKRYTY_OVEROVACI_OBSAH" if published is False else title
        )
        docs.append({"path": path, "title": title, "published": published})
        chunks.append(
            {
                "chunk_id": path + "::0",
                "document_path": path,
                "title": title,
                "published": published,
                "chunk_index": 0,
                "heading_paths": [["Úvod"]],
                "text": text,
                "text_length": len(text),
                "token_count": 10,
                "content_hash": str(index),
                "tags": [],
                "categories": [],
            }
        )
    data = tmp_path / "data"
    data.mkdir()
    for name, rows in [("documents.json", docs), ("chunks.json", chunks)]:
        (data / name).write_text(json.dumps(rows))
    monkeypatch.setattr(
        indexer, "embed_passages", lambda texts: np.ones((len(texts), 4), dtype=np.float32)
    )
    monkeypatch.setattr(
        search_core, "embed_query", lambda *args, **kwargs: np.ones(4, dtype=np.float32)
    )
    db = data / "zp_index.sqlite"
    indexer.build_database(
        documents_file=data / "documents.json", chunks_file=data / "chunks.json", db_file=db
    )
    version = {"version": "test-generation", "publication_policy": PUBLICATION_POLICY_VERSION}
    with sqlite3.connect(db) as conn:
        conn.execute("CREATE TABLE index_state (id INTEGER PRIMARY KEY, metadata_json TEXT)")
        conn.execute("INSERT INTO index_state VALUES (1,?)", (json.dumps(version),))
    durable_json(data / VERSION_FILE, version)
    monkeypatch.setattr(routes, "DB_FILE", db)
    monkeypatch.setattr(main, "embed_query", lambda *args: None)
    return db, version, paths


@pytest.mark.parametrize("value,visible", [(True, True), (None, True), (False, False)])
def test_publication_policy(value, visible):
    assert effective_published(value) is visible


def test_rag_default_filters_both_fts_and_vectors_but_keeps_null(corpus):
    db, _, paths = corpus
    result = search_database(db, "spoločný overovací výraz", limit=10)
    assert {r["document_path"] for r in result["results"]} == set(paths[:2])
    assert any(r["published"] is None for r in result["results"])
    all_rows = search_database(db, "spoločný overovací výraz", limit=10, published_only=False)
    assert {r["document_path"] for r in all_rows["results"]} == set(paths)


@pytest.mark.parametrize(
    "query", ["spoločný overovací výraz", "Skrytý dokument", "Skrytá poznámka"]
)
def test_rag_expansions_do_not_reintroduce_hidden_text(corpus, query):
    db, _, paths = corpus
    result = build_rag_context(db, query, limit=10)
    assert all(s["document_path"] not in paths[2:] for s in result["sources"])
    assert "SKRYTY_OVEROVACI_OBSAH" not in result["context"]
    all_rows = build_rag_context(db, query, limit=10, published_only=False)
    assert "SKRYTY_OVEROVACI_OBSAH" in all_rows["context"]


def healthy_graph(version):
    return health.readiness(True), health.readiness(True, index_version=version, nodes=2)


def test_neo4j_outage_does_not_disable_rag(corpus, monkeypatch):
    _, _, paths = corpus
    monkeypatch.setattr(
        health,
        "neo4j_readiness",
        lambda v: (
            health.readiness(False, "unreachable"),
            health.readiness(False, "neo4j_unavailable"),
        ),
    )
    with TestClient(main.app) as client:
        payload = client.get("/health").json()
        assert payload["tools"]["rag"]["ready"] is True
        assert payload["tools"]["neo4j"]["ready"] is False
        assert payload["tools"]["graphrag"]["ready"] is False
        assert payload["ready"] is False
        response = client.post(
            "/rag",
            json={"query": "spoločný overovací výraz"},
            headers={"Authorization": "Bearer " + "a" * 64},
        )
        assert response.status_code == 200
        assert {s["document_path"] for s in response.json()["sources"]} == set(paths[:2])


def test_rag_index_outage_does_not_disable_graph(corpus, monkeypatch):
    db, version, _ = corpus
    monkeypatch.setattr(health, "neo4j_readiness", healthy_graph)
    db.unlink()
    with TestClient(main.app) as client:
        payload = client.get("/health").json()
        assert payload["tools"]["rag"]["ready"] is False
        assert payload["tools"]["neo4j"]["ready"] is True
        assert payload["tools"]["graphrag"]["ready"] is True
        assert payload["ready"] is False


def test_pending_sync_blocks_both_tools_but_reports_neo4j_service(corpus, monkeypatch):
    db, _, _ = corpus
    durable_json(db.parent / PENDING_FILE, {"target_version": "next"})
    monkeypatch.setattr(health, "neo4j_readiness", healthy_graph)
    with TestClient(main.app) as client:
        tools = client.get("/health").json()["tools"]
        assert tools["rag"]["reason"] == tools["graphrag"]["reason"] == "snapshot_unavailable"
        assert tools["neo4j"]["ready"] is True


def test_embedding_startup_failure_and_successful_query_recovery(corpus, monkeypatch):
    monkeypatch.setattr(health, "neo4j_readiness", healthy_graph)

    def broken(*args):
        raise RuntimeError("transient warmup failure")

    monkeypatch.setattr(main, "embed_query", broken)
    with TestClient(main.app) as client:
        tools = client.get("/health").json()["tools"]
        assert tools["rag"]["reason"] == "embedding_not_ready"
        assert tools["graphrag"]["ready"] is True
        response = client.post(
            "/rag",
            json={"query": "spoločný overovací výraz"},
            headers={"Authorization": "Bearer " + "a" * 64},
        )
        assert response.status_code == 200
        assert client.get("/health").json()["tools"]["rag"]["ready"] is True


def test_neo4j_probe_is_bounded_and_does_not_expose_errors(monkeypatch):
    monkeypatch.setattr(health, "get_neo4j_settings", lambda: SimpleNamespace(database="neo4j"))
    captured = {}

    def fail(settings, **options):
        captured.update(options)
        raise RuntimeError("password=never-return-this")

    monkeypatch.setattr(health, "create_neo4j_driver", fail)
    result = health.neo4j_readiness(None)
    assert not result[0]["ready"] and not result[1]["ready"]
    assert captured["connection_timeout"] == captured["connection_acquisition_timeout"] == 2.0
    assert captured["max_transaction_retry_time"] == 0
    assert "never-return-this" not in json.dumps(result)


@pytest.mark.parametrize(
    "actual,nodes,reason",
    [
        ({"version": "different"}, 2, "version_mismatch"),
        (None, 0, "graph_empty"),
        ({"version": "old"}, 2, "publication_sync_required"),
    ],
)
def test_connection_readiness_is_distinct_from_graph_readiness(monkeypatch, actual, nodes, reason):
    class Result:
        def single(self):
            return {"nodes": nodes, "metadata": json.dumps(actual) if actual else None}

    class Connection:
        def __enter__(self):
            return self

        def __exit__(self, *args):
            pass

        def verify_connectivity(self):
            pass

        def session(self, **kwargs):
            return self

        def run(self, query, **params):
            assert query.timeout == 2.0
            return Result()

    monkeypatch.setattr(health, "get_neo4j_settings", lambda: SimpleNamespace(database="neo4j"))
    monkeypatch.setattr(health, "create_neo4j_driver", lambda *args, **kwargs: Connection())
    expected = {"version": "expected"} if reason == "version_mismatch" else actual
    neo, graph = health.neo4j_readiness(expected)
    assert neo["ready"] is True and graph["ready"] is False and graph["reason"] == reason