import logging
from pathlib import Path
from urllib.parse import parse_qs, urlparse

import pytest
from fastapi.testclient import TestClient

import router_dyndns.ddns_service as ddns_service
from router_dyndns.ddns import DdnsSettings, DdnsStore, DnsProviderError, make_app


def test_update_accepts_fritzbox_placeholders(tmp_path: Path) -> None:
    app = make_app(
        DdnsSettings(
            database_path=tmp_path / "ddns.sqlite3",
            shared_secret="secret",
            admin_password="admin",
            allowed_hosts={"home.example.net"},
        )
    )
    client = TestClient(app)

    response = client.get(
        "/nic/update",
        params={
            "hostname": "home.example.net",
            "myip": "203.0.113.8",
            "myipv6": "2001:db8::8",
            "password": "secret",
        },
    )

    assert response.status_code == 200
    assert response.text == "good 203.0.113.8"
    records = client.get("/records", auth=("admin", "admin")).json()
    assert records["total"] == 1
    assert records["items"][0]["hostname"] == "home.example.net"
    assert records["items"][0]["ipv4"] == "203.0.113.8"
    assert records["items"][0]["ipv6"] == "2001:db8::8"


def test_update_rejects_wrong_secret(tmp_path: Path) -> None:
    app = make_app(DdnsSettings(database_path=tmp_path / "ddns.sqlite3", shared_secret="secret"))
    client = TestClient(app)

    response = client.get(
        "/nic/update",
        params={"hostname": "home.example.net", "myip": "203.0.113.8", "password": "wrong"},
    )

    assert response.status_code == 401


def test_update_rejects_unlisted_host(tmp_path: Path) -> None:
    app = make_app(
        DdnsSettings(
            database_path=tmp_path / "ddns.sqlite3",
            shared_secret="secret",
            allowed_hosts={"home.example.net"},
        )
    )
    client = TestClient(app)

    response = client.get(
        "/nic/update",
        params={"hostname": "other.example.net", "myip": "203.0.113.8", "password": "secret"},
    )

    assert response.status_code == 403


def test_generated_account_can_update_own_hostname(tmp_path: Path) -> None:
    database_path = tmp_path / "ddns.sqlite3"
    store = DdnsStore(database_path)
    account = store.create_account("home.example.net", "alice")
    app = make_app(DdnsSettings(database_path=database_path, admin_password="admin"))
    client = TestClient(app)

    response = client.get(
        "/nic/update",
        params={
            "hostname": "home.example.net",
            "myip": "203.0.113.9",
            "username": account["username"],
            "password": account["password"],
        },
    )

    assert response.status_code == 200
    assert response.text == "good 203.0.113.9"

    slug_response = client.get(
        f"/u/{account['update_slug']}",
        params={"myip": "203.0.113.10"},
    )

    assert slug_response.status_code == 200
    assert slug_response.text == "good 203.0.113.10"


def test_one_box_update_url_can_authenticate_with_query_credentials(tmp_path: Path) -> None:
    database_path = tmp_path / "ddns.sqlite3"
    store = DdnsStore(database_path)
    account = store.create_account("home.example.net", "alice")
    settings = DdnsSettings(
        database_path=database_path,
        admin_password="admin",
        public_base_url="http://ddns.example.net",
    )
    app = make_app(settings)
    client = TestClient(app)
    one_box_url = ddns_service.DdnsService(settings, store).credentialed_update_url(account)
    parsed = urlparse(one_box_url)
    params = parse_qs(parsed.query)

    params["myip"] = ["203.0.113.11"]
    params["myipv6"] = [""]
    response = client.get(parsed.path, params={key: value[0] for key, value in params.items()})

    assert response.status_code == 200
    assert response.text == "good 203.0.113.11"
    assert response.headers["cache-control"] == "no-store"


def test_dns_publish_failure_does_not_update_record(tmp_path: Path, monkeypatch, caplog) -> None:
    def fail_publish(result, settings):
        raise DnsProviderError("dns down")

    caplog.set_level(logging.WARNING, logger="router_dyndns.ddns_service")
    monkeypatch.setattr(ddns_service, "publish_dns", fail_publish)
    database_path = tmp_path / "ddns.sqlite3"
    store = DdnsStore(database_path)
    account = store.create_account("home.example.net", "alice")
    app = make_app(DdnsSettings(database_path=database_path, admin_password="admin"))
    client = TestClient(app)

    response = client.get(f"/u/{account['update_slug']}", params={"myip": "203.0.113.9"})

    assert response.status_code == 500
    assert store.list_records() == []
    events = store.list_update_events()
    assert events[0]["status"] == "dns_failed"
    assert "DNS publish failed for hostname=home.example.net" in caplog.text
    assert account["update_slug"] not in caplog.text
    assert "dns down" not in caplog.text


def test_programming_error_during_publish_is_not_mapped_to_dns_failure(tmp_path: Path, monkeypatch) -> None:
    def fail_publish(result, settings):
        raise AssertionError("publish bug")

    monkeypatch.setattr(ddns_service, "publish_dns", fail_publish)
    database_path = tmp_path / "ddns.sqlite3"
    store = DdnsStore(database_path)
    account = store.create_account("home.example.net", "alice")
    app = make_app(DdnsSettings(database_path=database_path, admin_password="admin"))
    client = TestClient(app)

    with pytest.raises(AssertionError, match="publish bug"):
        client.get(f"/u/{account['update_slug']}", params={"myip": "203.0.113.9"})

    assert store.list_records() == []
    assert store.list_update_events() == []


def test_dns_publish_success_updates_record(tmp_path: Path, monkeypatch) -> None:
    published = []
    monkeypatch.setattr(ddns_service, "publish_dns", lambda result, settings: published.append(result))
    database_path = tmp_path / "ddns.sqlite3"
    store = DdnsStore(database_path)
    account = store.create_account("home.example.net", "alice")
    app = make_app(DdnsSettings(database_path=database_path, admin_password="admin"))
    client = TestClient(app)

    response = client.get(f"/u/{account['update_slug']}", params={"myip": "203.0.113.9"})

    assert response.status_code == 200
    assert response.text == "good 203.0.113.9"
    assert len(published) == 1
    assert store.list_records()[0]["ipv4"] == "203.0.113.9"


def test_unchanged_slug_update_is_read_only_for_history_and_record(tmp_path: Path, monkeypatch) -> None:
    published = []
    monkeypatch.setattr(ddns_service, "publish_dns", lambda result, settings: published.append(result))
    database_path = tmp_path / "ddns.sqlite3"
    store = DdnsStore(database_path)
    account = store.create_account("home.example.net", "alice")
    store.upsert("home.example.net", "203.0.113.9", None)
    before = store.list_records()[0]["updated_at"]
    app = make_app(DdnsSettings(database_path=database_path, admin_password="admin"))
    client = TestClient(app)

    response = client.get(f"/u/{account['update_slug']}", params={"myip": "203.0.113.9"})
    second_response = client.get(f"/u/{account['update_slug']}", params={"myip": "203.0.113.9"})

    assert response.status_code == 200
    assert response.text == "nochg 203.0.113.9"
    assert second_response.status_code == 200
    assert store.list_records()[0]["updated_at"] == before
    events = store.list_update_events()
    assert events[0]["status"] == "unchanged"
    assert events[0]["count"] == 2
    assert published == []


def test_shared_secret_still_updates_explicitly_allowed_hostname(tmp_path: Path) -> None:
    app = make_app(
        DdnsSettings(
            database_path=tmp_path / "ddns.sqlite3",
            shared_secret="secret",
            admin_password="admin",
            allowed_hosts={"home.example.net"},
        )
    )
    client = TestClient(app)

    response = client.get(
        "/nic/update",
        params={"hostname": "home.example.net", "myip": "203.0.113.9", "password": "secret"},
    )

    assert response.status_code == 200
    assert response.text == "good 203.0.113.9"


def test_omitted_ip_family_is_preserved(tmp_path: Path, monkeypatch) -> None:
    published = []
    monkeypatch.setattr(ddns_service, "publish_dns", lambda result, settings: published.append(result))
    database_path = tmp_path / "ddns.sqlite3"
    store = DdnsStore(database_path)
    account = store.create_account("home.example.net", "alice")
    store.upsert("home.example.net", "203.0.113.8", "2001:db8::8")
    app = make_app(DdnsSettings(database_path=database_path, admin_password="admin"))
    client = TestClient(app)

    response = client.get(f"/u/{account['update_slug']}", params={"myip": "203.0.113.9"})

    assert response.status_code == 200
    record = store.list_records()[0]
    assert record["ipv4"] == "203.0.113.9"
    assert record["ipv6"] == "2001:db8::8"
    assert published[0].update_ipv4 is True
    assert published[0].update_ipv6 is False


def test_blank_ip_params_fall_back_to_source_ip(tmp_path: Path) -> None:
    database_path = tmp_path / "ddns.sqlite3"
    store = DdnsStore(database_path)
    account = store.create_account("home.example.net", "alice")
    app = make_app(DdnsSettings(database_path=database_path, admin_password="admin"))
    client = TestClient(app, client=("198.51.100.44", 50000))

    response = client.get(
        f"/u/{account['update_slug']}",
        params={"myip": "", "myipv6": ""},
    )

    assert response.status_code == 200
    assert response.text == "good 198.51.100.44"
    assert store.list_records()[0]["ipv4"] == "198.51.100.44"


def test_invalid_legacy_ip_is_badip_and_does_not_change_record(tmp_path: Path, monkeypatch) -> None:
    published = []
    monkeypatch.setattr(ddns_service, "publish_dns", lambda result, settings: published.append(result))
    database_path = tmp_path / "ddns.sqlite3"
    store = DdnsStore(database_path)
    account = store.create_account("home.example.net", "alice")
    store.upsert("home.example.net", "203.0.113.8", "2001:db8::8")
    app = make_app(DdnsSettings(database_path=database_path, admin_password="admin"))
    client = TestClient(app)

    response = client.get(f"/u/{account['update_slug']}", params={"myip": "not-an-ip"})

    assert response.status_code == 400
    assert response.text == "badip"
    assert published == []
    record = store.list_records()[0]
    assert record["ipv4"] == "203.0.113.8"
    assert record["ipv6"] == "2001:db8::8"


def test_wrong_family_legacy_ip_is_badip_and_preserves_records(tmp_path: Path) -> None:
    database_path = tmp_path / "ddns.sqlite3"
    store = DdnsStore(database_path)
    account = store.create_account("home.example.net", "alice")
    store.upsert("home.example.net", "203.0.113.8", "2001:db8::8")
    app = make_app(DdnsSettings(database_path=database_path, admin_password="admin"))
    client = TestClient(app)

    response = client.get(f"/u/{account['update_slug']}", params={"myip": "2001:db8::9"})

    assert response.status_code == 400
    assert response.text == "badip"
    record = store.list_records()[0]
    assert record["ipv4"] == "203.0.113.8"
    assert record["ipv6"] == "2001:db8::8"


def test_nic_update_invalid_ip_returns_badip(tmp_path: Path) -> None:
    database_path = tmp_path / "ddns.sqlite3"
    store = DdnsStore(database_path)
    app = make_app(
        DdnsSettings(
            database_path=database_path,
            shared_secret="secret",
            admin_password="admin",
            allowed_hosts={"home.example.net"},
        )
    )
    client = TestClient(app)

    response = client.get(
        "/nic/update",
        params={"hostname": "home.example.net", "myipv6": "203.0.113.9", "password": "secret"},
    )

    assert response.status_code == 400
    assert response.text == "badip"
    assert store.list_records() == []