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import pandas as pd
import pytest
from freezegun import freeze_time

from superset.reports.notifications.exceptions import (
    NotificationParamException,
    NotificationUnprocessableException,
)
from superset.reports.notifications.webhook import WebhookNotification
from superset.utils.core import HeaderDataType


@pytest.fixture
def mock_header_data() -> HeaderDataType:
    return {
        "notification_format": "PNG",
        "notification_type": "Alert",
        "editors": [1],
        "notification_source": None,
        "chart_id": None,
        "dashboard_id": None,
        "slack_channels": None,
        "execution_id": "test-execution-id",
    }


def test_get_webhook_url(mock_header_data) -> None:
    """
    Test the _get_webhook_url function to ensure it correctly extracts
    the webhook URL from recipient configuration
    """
    from superset.reports.models import ReportRecipients, ReportRecipientType
    from superset.reports.notifications.base import NotificationContent

    content = NotificationContent(
        name="test alert",
        header_data=mock_header_data,
        embedded_data=pd.DataFrame({"A": [1, 2, 3], "B": [4, 5, 6]}),
        description="Test description",
    )
    webhook_notification = WebhookNotification(
        recipient=ReportRecipients(
            type=ReportRecipientType.WEBHOOK,
            recipient_config_json='{"target": "https://example.com/webhook"}',
        ),
        content=content,
    )

    result = webhook_notification._get_webhook_url()

    assert result == "https://example.com/webhook"


def test_get_webhook_url_missing_url(mock_header_data) -> None:
    """
    Test that _get_webhook_url raises an exception when URL is missing
    """
    from superset.reports.models import ReportRecipients, ReportRecipientType
    from superset.reports.notifications.base import NotificationContent

    content = NotificationContent(
        name="test alert",
        header_data=mock_header_data,
        description="Test description",
    )
    webhook_notification = WebhookNotification(
        recipient=ReportRecipients(
            type=ReportRecipientType.WEBHOOK,
            recipient_config_json="{}",
        ),
        content=content,
    )

    with pytest.raises(NotificationParamException, match="Webhook URL is required"):
        webhook_notification._get_webhook_url()


def test_get_req_payload_basic(mock_header_data) -> None:
    """
    Test that _get_req_payload returns correct payload structure
    """
    from superset.reports.models import ReportRecipients, ReportRecipientType
    from superset.reports.notifications.base import NotificationContent

    content = NotificationContent(
        name="Payload Name",
        header_data=mock_header_data,
        embedded_data=None,
        description="Payload Description",
        url="http://example.com/report",
        text="Report Text",
    )
    webhook_notification = WebhookNotification(
        recipient=ReportRecipients(
            type=ReportRecipientType.WEBHOOK,
            recipient_config_json='{"target": "https://webhook.com"}',
        ),
        content=content,
    )

    payload = webhook_notification._get_req_payload()

    assert payload["name"] == "Payload Name"
    assert payload["description"] == "Payload Description"
    assert payload["url"] == "http://example.com/report"
    assert payload["text"] == "Report Text"
    assert isinstance(payload["header"], dict)
    # Optional fields from header_data
    assert payload["header"]["notification_format"] == "PNG"
    assert payload["header"]["notification_type"] == "Alert"


def test_get_files_includes_all_content_types(mock_header_data) -> None:
    """
    Test that _get_files correctly includes csv, pdf, and multiple screenshot attachments
    """  # noqa: E501

    from superset.reports.models import ReportRecipients, ReportRecipientType
    from superset.reports.notifications.base import NotificationContent

    csv_bytes = b"col1,col2\n1,2"
    pdf_bytes = b"%PDF-1.4"
    screenshots = [b"fakeimg1", b"fakeimg2"]

    content = NotificationContent(
        name="file test",
        header_data=mock_header_data,
        csv=csv_bytes,
        pdf=pdf_bytes,
        screenshots=screenshots,
        description="files test",
    )
    webhook_notification = WebhookNotification(
        recipient=ReportRecipients(
            type=ReportRecipientType.WEBHOOK,
            recipient_config_json='{"target": "https://webhook.com"}',
        ),
        content=content,
    )
    files = webhook_notification._get_files()
    # There should be 1 csv, 1 pdf, and 2 screenshots = 4 files total
    assert len(files) == 4

    file_names = [file_info[1][0] for file_info in files]
    assert "report.csv" in file_names
    assert "report.pdf" in file_names
    assert "screenshot_0.png" in file_names
    assert "screenshot_1.png" in file_names

    mime_types = [file_info[1][2] for file_info in files]
    assert "text/csv" in mime_types
    assert "application/pdf" in mime_types
    assert mime_types.count("image/png") == 2


def test_get_files_includes_xlsx(mock_header_data: HeaderDataType) -> None:
    """_get_files attaches xlsx bytes as report.xlsx with the spreadsheet MIME type."""
    from superset.reports.models import ReportRecipients, ReportRecipientType
    from superset.reports.notifications.base import NotificationContent

    xlsx_bytes: bytes = b"PK\x03\x04 mock xlsx bytes"

    content = NotificationContent(
        name="file test",
        header_data=mock_header_data,
        xlsx=xlsx_bytes,
        description="xlsx files test",
    )
    webhook_notification = WebhookNotification(
        recipient=ReportRecipients(
            type=ReportRecipientType.WEBHOOK,
            recipient_config_json='{"target": "https://webhook.com"}',
        ),
        content=content,
    )
    files = webhook_notification._get_files()

    assert len(files) == 1
    file_name, file_bytes, mime_type = files[0][1]
    assert file_name == "report.xlsx"
    assert file_bytes == xlsx_bytes
    assert mime_type == (
        "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
    )


def test_get_files_empty_when_no_content(mock_header_data) -> None:
    """
    Test that _get_files returns empty list when no files present
    """
    from superset.reports.models import ReportRecipients, ReportRecipientType
    from superset.reports.notifications.base import NotificationContent

    content = NotificationContent(
        name="no files",
        header_data=mock_header_data,
        description="no files test",
    )
    webhook_notification = WebhookNotification(
        recipient=ReportRecipients(
            type=ReportRecipientType.WEBHOOK,
            recipient_config_json='{"target": "https://webhook.com"}',
        ),
        content=content,
    )
    files = webhook_notification._get_files()
    assert files == []


def test_send_http_only_https_check(monkeypatch, mock_header_data) -> None:
    """
    Test send raises when URL is not HTTPS and config enforces HTTPS only
    """
    from superset.reports.models import ReportRecipients, ReportRecipientType
    from superset.reports.notifications.base import NotificationContent

    content = NotificationContent(
        name="test alert", header_data=mock_header_data, description="Test description"
    )
    webhook_notification = WebhookNotification(
        recipient=ReportRecipients(
            type=ReportRecipientType.WEBHOOK,
            recipient_config_json='{"target": "http://notsecure.com/webhook"}',
        ),
        content=content,
    )

    class MockCurrentApp:
        config = {"ALERT_REPORTS_WEBHOOK_HTTPS_ONLY": True}

    monkeypatch.setattr(
        "superset.reports.notifications.webhook.current_app", MockCurrentApp
    )
    monkeypatch.setattr(
        "superset.reports.notifications.webhook.feature_flag_manager.is_feature_enabled",
        lambda flag: True,
    )

    with pytest.raises(NotificationParamException, match="HTTPS is required by config"):
        webhook_notification.send()


def test_send_treats_redirect_as_failure(monkeypatch, mock_header_data) -> None:
    """
    A 3xx response is a failure: redirects are not followed
    (allow_redirects=False), so the request never reached the final target and
    must not be reported as success.
    """
    from superset.reports.models import ReportRecipients, ReportRecipientType
    from superset.reports.notifications.base import NotificationContent

    content = NotificationContent(
        name="test alert", header_data=mock_header_data, description="Test description"
    )
    webhook_notification = WebhookNotification(
        recipient=ReportRecipients(
            type=ReportRecipientType.WEBHOOK,
            recipient_config_json='{"target": "https://example.com/webhook"}',
        ),
        content=content,
    )

    class MockCurrentApp:
        config = {
            "ALERT_REPORTS_WEBHOOK_HTTPS_ONLY": True,
            "ALERT_REPORTS_WEBHOOK_ALLOW_INTERNAL_HOSTS": True,
            "ALERT_REPORTS_WEBHOOK_TIMEOUT": 60,
        }

    class MockResponse:
        status_code = 302
        text = ""

    monkeypatch.setattr(
        "superset.reports.notifications.webhook.current_app", MockCurrentApp
    )
    monkeypatch.setattr(
        "superset.reports.notifications.webhook.feature_flag_manager.is_feature_enabled",
        lambda flag: True,
    )
    monkeypatch.setattr(
        "superset.reports.notifications.webhook.requests.post",
        lambda *args, **kwargs: MockResponse(),
    )

    with pytest.raises(NotificationParamException, match="redirect"):
        webhook_notification.send()


def test_send_forwards_configured_timeout(monkeypatch, mock_header_data) -> None:
    """
    send() forwards ALERT_REPORTS_WEBHOOK_TIMEOUT to requests.post so the
    call can't hang forever if the webhook target is unreachable.
    """
    from superset.reports.models import ReportRecipients, ReportRecipientType
    from superset.reports.notifications.base import NotificationContent

    content = NotificationContent(
        name="test alert", header_data=mock_header_data, description="Test description"
    )
    webhook_notification = WebhookNotification(
        recipient=ReportRecipients(
            type=ReportRecipientType.WEBHOOK,
            recipient_config_json='{"target": "https://example.com/webhook"}',
        ),
        content=content,
    )

    class MockCurrentApp:
        config = {
            "ALERT_REPORTS_WEBHOOK_HTTPS_ONLY": True,
            "ALERT_REPORTS_WEBHOOK_ALLOW_INTERNAL_HOSTS": True,
            "ALERT_REPORTS_WEBHOOK_TIMEOUT": 45,
        }

    class MockResponse:
        status_code = 200
        text = ""

    captured_kwargs: dict[str, object] = {}

    def fake_post(*args, **kwargs):
        captured_kwargs.update(kwargs)
        return MockResponse()

    monkeypatch.setattr(
        "superset.reports.notifications.webhook.current_app", MockCurrentApp
    )
    monkeypatch.setattr(
        "superset.reports.notifications.webhook.feature_flag_manager.is_feature_enabled",
        lambda flag: True,
    )
    monkeypatch.setattr(
        "superset.reports.notifications.webhook.requests.post", fake_post
    )

    webhook_notification.send()

    assert captured_kwargs["timeout"] == 45


def _make_webhook(mock_header_data) -> WebhookNotification:
    from superset.reports.models import ReportRecipients, ReportRecipientType
    from superset.reports.notifications.base import NotificationContent

    content = NotificationContent(
        name="test alert", header_data=mock_header_data, description="Test description"
    )
    return WebhookNotification(
        recipient=ReportRecipients(
            type=ReportRecipientType.WEBHOOK,
            recipient_config_json='{"target": "https://example.com/webhook"}',
        ),
        content=content,
    )


class _MockServerErrorResponse:
    status_code = 500
    text = ""


def _allow_internal_app() -> type:
    class MockCurrentApp:
        config = {
            "ALERT_REPORTS_WEBHOOK_HTTPS_ONLY": True,
            "ALERT_REPORTS_WEBHOOK_ALLOW_INTERNAL_HOSTS": True,
            "ALERT_REPORTS_WEBHOOK_TIMEOUT": 60,
        }

    return MockCurrentApp


def test_send_backoff_bounded_by_max_time(monkeypatch, mock_header_data) -> None:
    """
    A persistently failing (500) target gives up on wall-time (``max_time``),
    not just ``max_tries``. ``freeze_time(auto_tick_seconds=30)`` advances the
    clock on every time access (backoff measures elapsed via ``datetime.now``,
    which freezegun freezes and ticks), so cumulative elapsed crosses ``max_time=120``
    before ``max_tries=5`` is exhausted. We assert the discriminating *property*
    — gave up on wall-time strictly before exhausting ``max_tries`` — rather than
    a pinned count, because freezegun's per-call tick count is an opaque
    implementation detail. If ``max_time`` is removed this rises to the full 5
    (RED); the flat-clock companion test below anchors that 5 is the ceiling.
    The terminal exception type is unchanged on giveup.
    """
    webhook_notification = _make_webhook(mock_header_data)
    post_calls: list[int] = []

    def fake_post(*args, **kwargs) -> _MockServerErrorResponse:
        post_calls.append(1)
        return _MockServerErrorResponse()

    monkeypatch.setattr(
        "superset.reports.notifications.webhook.current_app", _allow_internal_app()
    )
    monkeypatch.setattr(
        "superset.reports.notifications.webhook.feature_flag_manager.is_feature_enabled",
        lambda flag: True,
    )
    monkeypatch.setattr(
        "superset.reports.notifications.webhook.requests.post", fake_post
    )
    monkeypatch.setattr("time.sleep", lambda *a, **k: None)

    with freeze_time("2020-01-01", auto_tick_seconds=30):
        with pytest.raises(NotificationUnprocessableException):
            webhook_notification.send()

    # 1 < count < max_tries(5): wall-time bound fired before tries exhausted.
    assert 1 < len(post_calls) < 5


def test_send_flat_clock_falls_back_to_max_tries(monkeypatch, mock_header_data) -> None:
    """
    Characterization (NOT a RED discriminator): with the clock held flat,
    ``max_time`` can never fire, so ``max_tries=5`` governs and exactly 5 POSTs
    happen. Passes on both buggy and fixed code; its job is to prove the 3-vs-5
    delta in ``test_send_backoff_bounded_by_max_time`` is attributable to
    wall-time, not to ``max_tries``.
    """
    webhook_notification = _make_webhook(mock_header_data)
    post_calls: list[int] = []

    def fake_post(*args, **kwargs) -> _MockServerErrorResponse:
        post_calls.append(1)
        return _MockServerErrorResponse()

    monkeypatch.setattr(
        "superset.reports.notifications.webhook.current_app", _allow_internal_app()
    )
    monkeypatch.setattr(
        "superset.reports.notifications.webhook.feature_flag_manager.is_feature_enabled",
        lambda flag: True,
    )
    monkeypatch.setattr(
        "superset.reports.notifications.webhook.requests.post", fake_post
    )
    monkeypatch.setattr("time.sleep", lambda *a, **k: None)

    with freeze_time("2020-01-01"):
        with pytest.raises(NotificationUnprocessableException):
            webhook_notification.send()

    assert len(post_calls) == 5


def test_send_max_time_does_not_abandon_recovering_target(
    monkeypatch, mock_header_data
) -> None:
    """
    No-regression guard: a target that fails twice (500) then succeeds on the
    3rd attempt still succeeds, and ``max_time=120`` is not set so low it
    abandons recovery. The clock advances a small +5s per access so ``max_time``
    is genuinely engaged (cumulative elapsed across 3 attempts stays comfortably
    under 120), unlike a flat clock which would pin elapsed at 0 and let the test
    pass at any ``max_time`` — including a misconfigured ``max_time=1``. Lower
    ``max_time`` enough and this test correctly fails.
    """
    webhook_notification = _make_webhook(mock_header_data)
    post_calls: list[int] = []

    class _OkResponse:
        status_code = 200
        text = ""

    def fake_post(*args, **kwargs):
        post_calls.append(1)
        if len(post_calls) < 3:
            return _MockServerErrorResponse()
        return _OkResponse()

    monkeypatch.setattr(
        "superset.reports.notifications.webhook.current_app", _allow_internal_app()
    )
    monkeypatch.setattr(
        "superset.reports.notifications.webhook.feature_flag_manager.is_feature_enabled",
        lambda flag: True,
    )
    monkeypatch.setattr(
        "superset.reports.notifications.webhook.requests.post", fake_post
    )
    monkeypatch.setattr("time.sleep", lambda *a, **k: None)

    with freeze_time("2020-01-01", auto_tick_seconds=5):
        webhook_notification.send()

    # The clock advances (+5s/access) so ``max_time`` is genuinely engaged, yet
    # cumulative elapsed across 3 attempts stays well under 120: the recovering
    # target (``fake_post`` succeeds on the 3rd) is not abandoned. A flat clock
    # would pin elapsed at 0 and pass at any ``max_time``, including a broken
    # ``max_time=1`` — this non-zero tick keeps the guard real.
    assert len(post_calls) == 3


def test_peer_validating_connection_blocks_rebound_peer() -> None:
    """
    The webhook POST validates the connected peer address, so a hostname that
    passes ``is_safe_host`` at validation time and then re-resolves to an
    internal address by the time the connection is opened (DNS rebinding) is
    rejected before any request bytes are sent -- mirrors the equivalent test
    for the dataset-import data-URI fetch path.
    """
    from unittest.mock import MagicMock, patch

    from urllib3.connection import HTTPConnection

    from superset.reports.notifications.exceptions import NotificationParamException
    from superset.reports.notifications.webhook import _PeerValidatingHTTPConnection

    sock = MagicMock()
    sock.getpeername.return_value = ("169.254.169.254", 80)

    with patch.object(
        HTTPConnection, "connect", lambda self: setattr(self, "sock", sock)
    ):
        conn = _PeerValidatingHTTPConnection("rebinder.example.com")
        with pytest.raises(NotificationParamException):
            conn.connect()


def test_peer_validating_connection_allows_public_peer() -> None:
    """A connection whose actual peer resolves to a public address is allowed
    through unmodified."""
    from unittest.mock import MagicMock, patch

    from urllib3.connection import HTTPConnection

    from superset.reports.notifications.webhook import _PeerValidatingHTTPConnection

    sock = MagicMock()
    sock.getpeername.return_value = ("93.184.216.34", 80)  # example.com, public

    with patch.object(
        HTTPConnection, "connect", lambda self: setattr(self, "sock", sock)
    ):
        conn = _PeerValidatingHTTPConnection("example.com")
        conn.connect()  # should not raise


def test_get_requester_returns_plain_requests_when_internal_hosts_allowed(
    monkeypatch,
) -> None:
    """
    When the operator opts into internal webhook targets via
    ``ALERT_REPORTS_WEBHOOK_ALLOW_INTERNAL_HOSTS``, ``_get_requester`` must
    return the plain ``requests`` module (no peer pinning), preserving the
    documented escape hatch for internal automation targets.
    """
    import requests

    from superset.reports.notifications.webhook import _get_requester

    monkeypatch.setattr(
        "superset.reports.notifications.webhook.current_app", _allow_internal_app()
    )

    assert _get_requester() is requests


def test_get_requester_pins_peer_when_internal_hosts_disallowed(monkeypatch) -> None:
    """
    By default (``ALERT_REPORTS_WEBHOOK_ALLOW_INTERNAL_HOSTS`` unset/False),
    ``_get_requester`` returns a session whose adapters validate the
    connected peer address rather than the plain ``requests`` module.
    """
    from superset.reports.notifications.webhook import (
        _get_requester,
        _PeerValidatingHTTPAdapter,
    )

    class MockCurrentApp:
        config = {"ALERT_REPORTS_WEBHOOK_ALLOW_INTERNAL_HOSTS": False}

    monkeypatch.setattr(
        "superset.reports.notifications.webhook.current_app", MockCurrentApp
    )

    requester = _get_requester()
    assert isinstance(requester.get_adapter("http://x/"), _PeerValidatingHTTPAdapter)
    assert isinstance(requester.get_adapter("https://x/"), _PeerValidatingHTTPAdapter)


def test_send_rejects_rebound_peer_despite_passed_hostname_check(
    monkeypatch, mock_header_data
) -> None:
    """
    End-to-end regression for the DNS-rebinding TOCTOU: the hostname check in
    ``_validate_webhook_url`` runs once, ahead of time, and is simulated here
    as having passed (as it would for a low-TTL record that resolves publicly
    at that moment) via monkeypatching ``is_safe_host``. The actual POST
    still connects to a loopback test server. Before the fix this reaches the
    server and succeeds; after the fix the connected peer is validated
    independently and the request is rejected regardless of what the
    hostname check concluded earlier.
    """
    import http.server
    import threading

    from superset.reports.models import ReportRecipients, ReportRecipientType
    from superset.reports.notifications.base import NotificationContent

    class Handler(http.server.BaseHTTPRequestHandler):
        def do_POST(self) -> None:  # noqa: N802
            self.send_response(200)
            self.end_headers()
            self.wfile.write(b"ok")

        def log_message(self, *_args: object) -> None:
            pass

    server = http.server.HTTPServer(("127.0.0.1", 0), Handler)
    port = server.server_port
    thread = threading.Thread(target=server.serve_forever, daemon=True)
    thread.start()
    try:
        content = NotificationContent(
            name="test alert",
            header_data=mock_header_data,
            description="Test description",
        )
        webhook_notification = WebhookNotification(
            recipient=ReportRecipients(
                type=ReportRecipientType.WEBHOOK,
                recipient_config_json=(f'{{"target": "http://127.0.0.1:{port}/"}}'),
            ),
            content=content,
        )

        class MockCurrentApp:
            config = {
                "ALERT_REPORTS_WEBHOOK_HTTPS_ONLY": False,
                "ALERT_REPORTS_WEBHOOK_ALLOW_INTERNAL_HOSTS": False,
                "ALERT_REPORTS_WEBHOOK_TIMEOUT": 5,
            }

        monkeypatch.setattr(
            "superset.reports.notifications.webhook.current_app", MockCurrentApp
        )
        monkeypatch.setattr(
            "superset.reports.notifications.webhook.feature_flag_manager."
            "is_feature_enabled",
            lambda flag: True,
        )
        # Simulate the hostname check having passed at validation time (a
        # low-TTL DNS record resolving publicly at that instant).
        monkeypatch.setattr(
            "superset.reports.notifications.webhook.is_safe_host",
            lambda host: True,
        )

        with pytest.raises(
            (NotificationParamException, NotificationUnprocessableException)
        ):
            webhook_notification.send()
    finally:
        server.shutdown()


def test_send_error_message_omits_response_body(monkeypatch, mock_header_data) -> None:
    """
    A failing response's body must not be interpolated into the raised
    exception message: that message is persisted verbatim as the report
    execution log's error message and readable via the logs API, which would
    otherwise turn the webhook target into a readback oracle for whatever
    it returns (e.g. a cloud metadata service reached via DNS rebinding).
    """
    webhook_notification = _make_webhook(mock_header_data)
    leaked_response_content = "internal-metadata-service-response-body"

    class _LeakyResponse:
        status_code = 502
        text = leaked_response_content

    monkeypatch.setattr(
        "superset.reports.notifications.webhook.current_app", _allow_internal_app()
    )
    monkeypatch.setattr(
        "superset.reports.notifications.webhook.feature_flag_manager.is_feature_enabled",
        lambda flag: True,
    )
    monkeypatch.setattr(
        "superset.reports.notifications.webhook.requests.post",
        lambda *args, **kwargs: _LeakyResponse(),
    )
    monkeypatch.setattr("time.sleep", lambda *a, **k: None)

    with pytest.raises(NotificationUnprocessableException) as excinfo:
        webhook_notification.send()

    assert leaked_response_content not in str(excinfo.value)
    assert "502" in str(excinfo.value)