"""
Copyright 2024-2026 ReplyPier

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

What the widget socket tells the page about the conversation it landed in, and
adopting a rotated token on a connection that is already open.
"""
from unittest.mock import AsyncMock, MagicMock
from uuid import uuid4

import pytest

from app.api import widget_chat
from app.models.customer import Customer
from app.models.session_to_agent import SessionStatus, SessionToAgent
from app.repositories.session_to_agent import SessionToAgentRepository
from app.services import conversation_token


@pytest.fixture
def mock_sio():
    mock = MagicMock()
    mock.enter_room = AsyncMock()
    mock.emit = AsyncMock()
    mock.save_session = AsyncMock()
    mock.get_environ = MagicMock()
    mock.get_session = AsyncMock()
    mock.leave_room = AsyncMock()
    return mock


@pytest.fixture
def identified_customer(db, test_organization) -> Customer:
    customer = Customer(
        organization_id=test_organization.id,
        email="signed.in@example.com",
        full_name="Signed In",
        is_authenticated=True,
    )
    db.add(customer)
    db.commit()
    db.refresh(customer)
    return customer


@pytest.fixture
def connected(db, test_widget, test_ai_config, identified_customer, mock_sio, monkeypatch):
    """A widget socket connected as the identified visitor."""
    token, _, _ = conversation_token.mint(
        {
            "sub": str(identified_customer.id),
            "widget_id": str(test_widget.id),
            "customer_email": identified_customer.email,
        },
        ttl_seconds=600,
    )

    monkeypatch.setattr(widget_chat, "sio", mock_sio)
    monkeypatch.setattr(widget_chat, "get_db", lambda: iter([db]))
    monkeypatch.setattr(
        widget_chat,
        "authenticate_socket_conversation_token",
        AsyncMock(return_value=(
            str(test_widget.id),
            str(test_widget.organization_id),
            str(identified_customer.id),
            token,
        )),
    )
    monkeypatch.setattr(
        "app.repositories.widget.WidgetRepository.get_widget",
        lambda self, widget_id: test_widget,
    )
    ai_repo = MagicMock()
    ai_repo.get_active_config.return_value = test_ai_config
    monkeypatch.setattr(widget_chat, "AIConfigRepository", lambda db: ai_repo)
    return token


def _session_initialized(mock_sio) -> dict:
    for call in mock_sio.emit.call_args_list:
        if call[0][0] == 'session_initialized':
            return call[0][1]
    raise AssertionError("session_initialized was never emitted")


@pytest.mark.asyncio
async def test_a_new_conversation_is_reported_as_created_and_authenticated(mock_sio, connected):
    assert await widget_chat.widget_connect("sid-1", {}, {}) is True

    payload = _session_initialized(mock_sio)
    assert payload['created'] is True
    assert payload['authenticated'] is True


@pytest.mark.asyncio
async def test_resuming_a_conversation_is_not_reported_as_created(
    db, test_widget, identified_customer, mock_sio, connected
):
    open_session = SessionToAgent(
        session_id=uuid4(),
        customer_id=identified_customer.id,
        agent_id=test_widget.agent_id,
        organization_id=test_widget.organization_id,
        status=SessionStatus.OPEN,
    )
    db.add(open_session)
    db.commit()

    assert await widget_chat.widget_connect("sid-2", {}, {}) is True

    payload = _session_initialized(mock_sio)
    assert payload['created'] is False
    assert payload['session_id'] == str(open_session.session_id)


@pytest.mark.asyncio
async def test_an_anonymous_visitor_is_not_reported_as_authenticated(
    db, test_widget, test_ai_config, test_customer, mock_sio, monkeypatch
):
    anonymous_token, _, _ = conversation_token.mint(
        {"sub": str(test_customer.id), "widget_id": str(test_widget.id)}, ttl_seconds=600
    )
    monkeypatch.setattr(widget_chat, "sio", mock_sio)
    monkeypatch.setattr(widget_chat, "get_db", lambda: iter([db]))
    monkeypatch.setattr(
        widget_chat,
        "authenticate_socket_conversation_token",
        AsyncMock(return_value=(
            str(test_widget.id), str(test_widget.organization_id),
            str(test_customer.id), anonymous_token,
        )),
    )
    monkeypatch.setattr(
        "app.repositories.widget.WidgetRepository.get_widget",
        lambda self, widget_id: test_widget,
    )
    ai_repo = MagicMock()
    ai_repo.get_active_config.return_value = test_ai_config
    monkeypatch.setattr(widget_chat, "AIConfigRepository", lambda db: ai_repo)

    assert await widget_chat.widget_connect("sid-3", {}, {}) is True

    assert _session_initialized(mock_sio)['authenticated'] is False


@pytest.mark.asyncio
async def test_a_rotated_token_replaces_the_one_the_socket_connected_with(
    test_widget, identified_customer, mock_sio, connected
):
    await widget_chat.widget_connect("sid-4", {}, {})
    session = mock_sio.save_session.call_args[0][1]
    mock_sio.get_session.return_value = session
    rotated, _, _ = conversation_token.mint(
        {
            "sub": str(identified_customer.id),
            "widget_id": str(test_widget.id),
            "customer_email": identified_customer.email,
        },
        ttl_seconds=600,
    )

    await widget_chat.handle_refresh_token("sid-4", {"conversation_token": rotated})

    assert mock_sio.save_session.call_args[0][1]['conversation_token'] == rotated


@pytest.mark.asyncio
async def test_a_token_for_another_customer_is_refused(
    db, test_widget, test_customer, mock_sio, connected
):
    await widget_chat.widget_connect("sid-5", {}, {})
    session = mock_sio.save_session.call_args[0][1]
    mock_sio.get_session.return_value = session
    someone_else, _, _ = conversation_token.mint(
        {"sub": str(test_customer.id), "widget_id": str(test_widget.id)}, ttl_seconds=600
    )

    await widget_chat.handle_refresh_token("sid-5", {"conversation_token": someone_else})

    # The socket keeps its own conversation; a refresh may never move it to another.
    assert mock_sio.save_session.call_args[0][1]['conversation_token'] == connected


@pytest.mark.asyncio
async def test_a_conversation_survives_the_token_it_started_with(
    db, test_widget, identified_customer, mock_sio, connected, monkeypatch
):
    """The failure this whole path exists for: a chat open longer than its token.

    end_chat re-authenticates from the token the socket connected with, so a
    conversation whose token was rotated in the page must close on the rotated one -
    otherwise the visitor's New chat silently does nothing.
    """
    await widget_chat.widget_connect("sid-7", {}, {})
    session = mock_sio.save_session.call_args[0][1]
    mock_sio.get_session.return_value = session
    session_id = session['session_id']

    rotated, _, _ = conversation_token.mint(
        {
            "sub": str(identified_customer.id),
            "widget_id": str(test_widget.id),
            "customer_email": identified_customer.email,
        },
        ttl_seconds=600,
    )
    await widget_chat.handle_refresh_token("sid-7", {"conversation_token": rotated})
    mock_sio.get_session.return_value = mock_sio.save_session.call_args[0][1]

    # The original token is now gone, exactly as it would be past its TTL.
    monkeypatch.setattr(
        widget_chat,
        "authenticate_socket_conversation_token",
        AsyncMock(side_effect=lambda sid, sess: (
            (str(test_widget.id), str(test_widget.organization_id),
             str(identified_customer.id), sess.get('conversation_token'))
            if sess.get('conversation_token') == rotated
            else (None, None, None, None)
        )),
    )

    await widget_chat.handle_end_chat("sid-7", {"reason": "CUSTOMER_REQUEST"})

    closed = SessionToAgentRepository(db).get_session(session_id)
    assert closed.status == SessionStatus.CLOSED
    assert any(call[0][0] == 'chat_ended' for call in mock_sio.emit.call_args_list)


@pytest.mark.asyncio
async def test_a_taken_over_conversation_can_still_adopt_a_rotated_token(
    db, test_widget, test_user, identified_customer, mock_sio, connected
):
    """A handover lasts far longer than an hour-long token. Refreshing must keep
    working while a person is handling the chat, or the socket ends up holding a
    token that no longer authenticates mid-conversation."""
    await widget_chat.widget_connect("sid-8", {}, {})
    session = mock_sio.save_session.call_args[0][1]
    mock_sio.get_session.return_value = session

    # A human agent takes the conversation over.
    repo = SessionToAgentRepository(db)
    taken_over = repo.get_session(session['session_id'])
    taken_over.user_id = test_user.id
    db.commit()

    rotated, _, _ = conversation_token.mint(
        {
            "sub": str(identified_customer.id),
            "widget_id": str(test_widget.id),
            "customer_email": identified_customer.email,
        },
        ttl_seconds=600,
    )
    await widget_chat.handle_refresh_token("sid-8", {"conversation_token": rotated})

    assert mock_sio.save_session.call_args[0][1]['conversation_token'] == rotated
    assert repo.get_session(session['session_id']).user_id == test_user.id


@pytest.mark.asyncio
async def test_an_unusable_token_is_refused(mock_sio, connected):
    await widget_chat.widget_connect("sid-6", {}, {})
    session = mock_sio.save_session.call_args[0][1]
    mock_sio.get_session.return_value = session

    await widget_chat.handle_refresh_token("sid-6", {"conversation_token": "not-a-jwt"})

    assert mock_sio.save_session.call_args[0][1]['conversation_token'] == connected


@pytest.mark.asyncio
async def test_closing_a_chat_does_not_depend_on_the_token_still_being_live(
    db, mock_sio, connected, monkeypatch
):
    """The symptom the visitor reported: "Authentication failed" on closing the chat.

    end_chat used to re-verify the conversation token, so a chat open longer than
    its TTL - or one whose JTI Redis had dropped - could not be closed at all. This
    kills the token by every measure the old path used and expects the close to go
    through regardless.
    """
    await widget_chat.widget_connect("sid-closing", {}, {})
    session = mock_sio.save_session.call_args[0][1]
    mock_sio.get_session.return_value = session
    session_id = session['session_id']

    # Expired signature, and a JTI Redis no longer knows about.
    monkeypatch.setattr(
        widget_chat,
        "authenticate_socket_conversation_token",
        AsyncMock(return_value=(None, None, None, None)),
    )
    monkeypatch.setattr(widget_chat, "verify_conversation_token", lambda token: None)
    monkeypatch.setattr(
        "app.core.security.verify_conversation_token", lambda token: None
    )

    await widget_chat.handle_end_chat("sid-closing", {"reason": "CUSTOMER_REQUEST"})

    closed = SessionToAgentRepository(db).get_session(session_id)
    assert closed.status == SessionStatus.CLOSED
    assert any(call[0][0] == 'chat_ended' for call in mock_sio.emit.call_args_list)
    assert not _auth_errors(mock_sio)


@pytest.mark.asyncio
async def test_the_contact_form_gets_past_the_guard_after_the_token_lapses(
    mock_sio, connected, monkeypatch
):
    """The handoff contact form posts on a connection that may be hours old.

    Refusing it at the identity guard would lose the email a person is waiting on
    to follow up. This covers the guard only - what the handler then does with the
    address is the subject of the contact-capture tests.
    """
    await widget_chat.widget_connect("sid-contact", {}, {})
    session = mock_sio.save_session.call_args[0][1]
    mock_sio.get_session.return_value = session

    monkeypatch.setattr(
        widget_chat,
        "authenticate_socket_conversation_token",
        AsyncMock(return_value=(None, None, None, None)),
    )

    # An address the handler must reject on its own merits: reaching the
    # validation error proves it got past the identity guard.
    await widget_chat.handle_contact_info(
        "sid-contact", {"form_data": {"email": "not-an-address"}}
    )

    assert not _auth_errors(mock_sio)
    assert any(
        call[0][0] == 'error' and call[0][1].get('type') == 'validation_error'
        for call in mock_sio.emit.call_args_list
    )


# Every widget event that used to re-verify the conversation token, with an
# argument shape each one accepts. What the handler goes on to do differs; what
# they must agree on is that a lapsed token is not a reason to refuse.
GUARDED_HANDLERS = [
    ("chat", lambda sid: widget_chat.handle_widget_chat(sid, {"message": "hello"})),
    ("get_chat_history", lambda sid: widget_chat.get_widget_chat_history(sid)),
    ("end_chat", lambda sid: widget_chat.handle_end_chat(sid, {"reason": "CUSTOMER_REQUEST"})),
    ("submit_rating", lambda sid: widget_chat.handle_rating_submission(sid, {"rating": 5})),
    ("get_workflow_state", lambda sid: widget_chat.handle_get_workflow_state(sid)),
    ("proceed_workflow", lambda sid: widget_chat.handle_proceed_workflow(sid, {})),
    ("submit_contact_info", lambda sid: widget_chat.handle_contact_info(
        sid, {"form_data": {"email": "someone@example.com"}})),
    ("submit_form", lambda sid: widget_chat.handle_form_submission(
        sid, {"form_data": {"name": "Someone"}})),
]


@pytest.mark.asyncio
@pytest.mark.parametrize("name,call", GUARDED_HANDLERS, ids=[h[0] for h in GUARDED_HANDLERS])
async def test_no_widget_event_refuses_a_live_connection_over_a_lapsed_token(
    name, call, mock_sio, connected, monkeypatch
):
    """One rule, eight handlers: the token authenticates the connection, and a
    connection that was authenticated stays authenticated for its lifetime.

    Anything else and a chat open longer than its TTL starts failing an event at a
    time - which is how this reached us, as messages that stopped sending and a
    New chat button that did nothing (#315).
    """
    await widget_chat.widget_connect(f"sid-{name}", {}, {})
    session = mock_sio.save_session.call_args[0][1]
    mock_sio.get_session.return_value = session
    mock_sio.emit.reset_mock()

    # Dead by every measure the old per-event check used.
    monkeypatch.setattr(
        widget_chat,
        "authenticate_socket_conversation_token",
        AsyncMock(return_value=(None, None, None, None)),
    )
    monkeypatch.setattr(widget_chat, "verify_conversation_token", lambda token: None)

    await call(f"sid-{name}")

    assert not _auth_errors(mock_sio), f"{name} refused a live connection"


def _auth_errors(mock_sio) -> list:
    return [
        call for call in mock_sio.emit.call_args_list
        if call[0][0] == 'error' and call[0][1].get('type') == 'auth_error'
    ]